03. Kubernetes安装篇-二进制

架构解析

高可用架构图

组件用途

Etcd Cluster
- ectd是一个键值数据库，主要存放Kubernetes数据，如创建的资源、变更的操作等；
Master
- Kubernetes中的控制节点，主要用于控制Kubernetes集群；
Node
- Kubernetes中的工作节点，主要用于运行Kubernetes集群部署的Pod；
Kube-APIServer
- Kubernetes中的控制组件，Kubernetes集群中所有流量都会经过Kube-APIServer；
ControllerManager
- Kubernetes中的控制组件，主要用于监控Kubernetes集群的状态；
Scheduler
- Kubernetes中的调度组件，主要用于控制Kubernetes集群中的Pod调度到哪个Node节点去运行；
Load Balancer
- Kubernetes中各个节点直接负载均衡器，一般使用keepailved和haproxy组合实现负责均衡；
Kubelet
- Kubernetes中的代理组件，主要用于保证Kubernetes集群中的Pod运行状态；
Kube-Proxy
- Kubernetes中的网络代理组件，主要用于保证Kubernetes集群中的Pod访问控制；

部署集群

主机规划

主机名称	主机地址	主机资源	安装组件	主机用途
k8s-master-01	192.168.23.101	2C4G；200G	haproxy+keepalived+ectd+Kubernetes-Master	集群管理节点
k8s-master-02	192.168.23.102	2C4G；200G	haproxy+keepalived+ectd+Kubernetes-Master	集群管理节点
k8s-master-03	192.168.23.103	2C4G；200G	haproxy+keepalived+ectd+Kubernetes-Master	集群管理节点
k8s-node-04	192.168.23.104	1C2G；200G	Kubernetes-Node	集群工作节点
k8s-node-05	192.168.23.105	1C2G；200G	Kubernetes-Node	集群工作节点
Vip	192.168.23.100			集群虚拟IP
K8S Service	k8s service网段为192.168.0.0/16

K8S Pod	k8s Pod网段为172.16.0.0/12

注意事项

（1）宿主机网段、K8s Service网段、Pod网段不能重复

（2）主机信息，服务器IP地址不能设置成dhcp，要配置成静态IP

（3）VIP（虚拟IP）不要和公司内网IP重复，首先去ping一下，不通才可用。VIP需要和你的主机在同一个局域网内！不是直接用我的VIP！！！

（4）公有云的话，VIP为公有云的负载均衡的IP，比如阿里云的SLB地址，腾讯云的ELB地址，注意公有云的负载均衡都是内网的负载均衡。

（5）生产环境中etcd一定要和系统盘分开，一定要用ssd硬盘。

（6）Docker数据盘也要和系统盘分开，有条件的话可以使用ssd硬盘。

基础安装

注意：涉及所有节点

国内安装源

阿里云yum源

cat > /etc/yum.repos.d/CentOS-7-ali.repo << 'EOF'
# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client.  You should use this for CentOS updates
# unless you are manually picking other mirrors.
#
# If the mirrorlist= does not work for you, as a fall back you can try the 
# remarked out baseurl= line instead.
#
#
 
[base]
name=CentOS-$releasever - Base - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/$releasever/os/$basearch/
        http://mirrors.aliyuncs.com/centos/$releasever/os/$basearch/
        http://mirrors.cloud.aliyuncs.com/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
 
#released updates 
[updates]
name=CentOS-$releasever - Updates - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/$releasever/updates/$basearch/
        http://mirrors.aliyuncs.com/centos/$releasever/updates/$basearch/
        http://mirrors.cloud.aliyuncs.com/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
 
#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/$releasever/extras/$basearch/
        http://mirrors.aliyuncs.com/centos/$releasever/extras/$basearch/
        http://mirrors.cloud.aliyuncs.com/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
 
#additional packages that extend functionality of existing packages
EOF

阿里云epel源

cat > epel-7-ali.repo << 'EOF'
[epel]
name=Extra Packages for Enterprise Linux 7 - $basearch
baseurl=http://mirrors.aliyun.com/epel/7/$basearch
failovermethod=priority
enabled=1
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
 
[epel-debuginfo]
name=Extra Packages for Enterprise Linux 7 - $basearch - Debug
baseurl=http://mirrors.aliyun.com/epel/7/$basearch/debug
failovermethod=priority
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
gpgcheck=0
 
[epel-source]
name=Extra Packages for Enterprise Linux 7 - $basearch - Source
baseurl=http://mirrors.aliyun.com/epel/7/SRPMS
failovermethod=priority
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
gpgcheck=0
EOF

地址解析

修改hostname

hostnamectl set-hostname k8s-master-01
hostnamectl set-hostname k8s-master-02
hostnamectl set-hostname k8s-master-03
hostnamectl set-hostname k8s-node-01
hostnamectl set-hostname k8s-node-02

配置hosts

cat >> /etc/hosts << EOF
192.168.23.100 k8s-lb
192.168.23.101 k8s-master-01
192.168.23.102 k8s-master-02
192.168.23.103 k8s-master-03
192.168.23.104 k8s-node-01
192.168.23.105 k8s-node-02
EOF

免密登录

创建秘钥（k8s-master-01节点）

ssh-keygen 
# Generating public/private rsa key pair.
# Enter file in which to save the key (/root/.ssh/id_rsa): 
# Created directory '/root/.ssh'.
# Enter passphrase (empty for no passphrase): 
# Enter same passphrase again: 
# Your identification has been saved in /root/.ssh/id_rsa.
# Your public key has been saved in /root/.ssh/id_rsa.pub.
# The key fingerprint is:
# SHA256:ocKDZzHfVRKKLCZ1R8d5ZJ597AWobrc3e/m4iYsn1lI root@k8s-master-01
# The key's randomart image is:
# +---[RSA 2048]----+
# |    . ..o.+++..  |
# |   . o o oo=oo o |
# |  . = o o .oo . +|
# |   = = o o.    o.|
# |  . * o S.      .|
# |   o o    o E    |
# |         . + .  .|
# |          +.+.o+.|
# |         ..+oo==o|
# +----[SHA256]-----+

分发秘钥

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    ssh-copy-id -i root@$IP_HOST
    echo "------$IP_HOST OK------"
done

必备工具

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "yum -y install wget jq psmisc vim net-tools telnet yum-utils device-mapper-persistent-data lvm2 git vim"
    echo "------$IP_HOST OK------"
done

内核升级

下载内核

cd /root
wget http://193.49.22.109/elrepo/kernel/el7/x86_64/RPMS/kernel-ml-devel-4.19.12-1.el7.elrepo.x86_64.rpm
wget http://193.49.22.109/elrepo/kernel/el7/x86_64/RPMS/kernel-ml-4.19.12-1.el7.elrepo.x86_64.rpm

安装升级

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    scp /root/kernel-ml* root@$IP_HOST:/root/
    ssh root@$IP_HOST "yum -y install /root/kernel-ml*"
    echo "------$IP_HOST OK------"
done

升级内核

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "grub2-set-default 0 && grub2-mkconfig -o /boot/grub2/grub.cfg"
    echo "------$IP_HOST OK------"
done
#统一重启

检查内核

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "uname -r"
    echo "------$IP_HOST OK------"
done

时钟同步

安装工具

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "yum -y install ntpdate chrony"
    ssh root@$IP_HOST "sed -ri 's/^server/#server/g' /etc/chrony.conf && echo 'server ntp.aliyun.com iburst' >> /etc/chrony.conf"
    ssh root@$IP_HOST "systemctl enable --now chronyd"
    echo "------$IP_HOST OK------"
done

定时任务

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "echo '*/10 * * * * /usr/sbin/ntpdate ntp.aliyun.com' >> /var/spool/cron/root"
    echo "------$IP_HOST OK------"
done

验证同步

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "chronyc sourcestats -v"
    echo "------$IP_HOST OK------"
done

基础环境

注意：涉及所有节点

关闭selinux

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "setenforce 0 && sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/sysconfig/selinux"
    echo "------$IP_HOST OK------"
done

关闭firewalld

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "systemctl stop firewalld && systemctl disable firewalld"
    echo "------$IP_HOST OK------"
done

关闭swap

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "swapoff -a && sysctl -w vm.swappiness=0 && sed -ri '/^[^#]*swap/s@^@#@' /etc/fstab"
    echo "------$IP_HOST OK------"
done

关闭dnsmasq

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "systemctl stop dnsmasq && systemctl disable dnsmasq"
    echo "------$IP_HOST OK------"
done

集群调优

注意：涉及所有节点

配置系统资源限制

cat >> /root/limits.conf << EOF
* soft noproc 655350
* hard noproc 655350
* soft nofile 655350
* hard nofile 655350
EOF

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    scp /root/limits.conf root@$IP_HOST:/etc/security/
    echo "------$IP_HOST OK------"
done
#用于调整用户的系统资源限制，要求大于65535

配置系统调优参数

开启一些k8s集群中必须的内核参数，所有节点配置k8s内核

cat > /root/k8s.conf << EOF
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-ip6tables = 1
fs.may_detach_mounts = 1
vm.overcommit_memory=1
net.ipv4.conf.all.route_localnet = 1
vm.panic_on_oom=0
fs.inotify.max_user_watches=89100
fs.file-max=52706963
fs.nr_open=52706963
net.netfilter.nf_conntrack_max=2310720
net.ipv4.tcp_keepalive_time = 600
net.ipv4.tcp_keepalive_probes = 3
net.ipv4.tcp_keepalive_intvl =15
net.ipv4.tcp_max_tw_buckets = 36000
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_max_orphans = 327680
net.ipv4.tcp_orphan_retries = 3
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.ip_conntrack_max = 65536
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.tcp_timestamps = 0
net.core.somaxconn = 16384
EOF

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    scp /root/k8s.conf root@$IP_HOST:/etc/sysctl.d/
    ssh root@$IP_HOST "sysctl --system"
    echo "------$IP_HOST OK------"
done

#用于系统调优参数配置

配置文件优化参数

cat > /root/k8s.conf <<EOF
*       soft    nproc   1048576
*       hard    nproc   1048576
*       soft    nofile  1048576
*       hard    nofile  1048576
root    soft    nproc   1048576
root    hard    nproc   1048576
root    soft    nofile  1048576
root    hard    nofile  1048576
EOF

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    scp /root/k8s.conf root@$IP_HOST:/etc/security/limits.d/
    echo "------$IP_HOST OK------"
done

#用于文件最大打开数调优

配置日志优化参数

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "sed -ri 's/^\$ModLoad imjournal/#&/' /etc/rsyslog.conf"
    ssh root@$IP_HOST "sed -ri 's/^\$IMJournalStateFile/#&/' /etc/rsyslog.conf"
    ssh root@$IP_HOST "sed -ri 's/^#(DefaultLimitCORE)=/\1=100000/' /etc/systemd/system.conf"
    ssh root@$IP_HOST "sed -ri 's/^#(DefaultLimitNOFILE)=/\1=100000/' /etc/systemd/system.conf"
    echo "------$IP_HOST OK------"
done

#用于优化日志处理，减少磁盘IO

配置连接优化参数

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "sed -ri 's/^#(UseDNS )yes/\1no/' /etc/ssh/sshd_config"
    echo "------$IP_HOST OK------"
done

#用于ssh 连接优化

组件安装

安装ipvsadm

注意：涉及所有节点

安装ipvsadm组件

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "yum -y install ipvsadm ipset sysstat conntrack libseccomp"
    echo "------$IP_HOST OK------"
done

配置ipvs模块

注意：在内核4.19+版本nf_conntrack_ipv4已经改为nf_conntrack， 4.18以下使用nf_conntrack_ipv4即可

cat > /root/ipvs.conf << EOF
ip_vs
ip_vs_lc
ip_vs_wlc
ip_vs_rr
ip_vs_wrr
ip_vs_lblc
ip_vs_lblcr
ip_vs_dh
ip_vs_sh
ip_vs_fo
ip_vs_nq
ip_vs_sed
ip_vs_ftp
ip_vs_sh
nf_conntrack
ip_tables
ip_set
xt_set
ipt_set
ipt_rpfilter
ipt_REJECT
ipip
EOF

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "modprobe -- ip_vs && modprobe -- ip_vs_rr && modprobe -- ip_vs_wrr && modprobe -- ip_vs_sh && modprobe -- nf_conntrack"
    scp /root/ipvs.conf root@$IP_HOST:/etc/modules-load.d/
    echo "------$IP_HOST OK------"
done

启动ipvsadm并验证是否加载

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "systemctl enable --now systemd-modules-load.service && systemctl status systemd-modules-load.service"
    ssh root@$IP_HOST "lsmod | grep -e ip_vs -e nf_conntrack"
    echo "------$IP_HOST OK------"
done

安装Containerd

注意：涉及所有节点

安装Containerd

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    #解决依赖
    ssh root@$IP_HOST "yum -y install yum-utils && yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo"
    
    #安装服务
    ssh root@$IP_HOST "yum -y install docker-ce-20.10.* docker-ce-cli-20.10.* containerd"
    echo "------$IP_HOST OK------"
done

配置Containerd所需模块

cat > /root/containerd.conf << EOF
overlay
br_netfilter
EOF

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    #配置Containerd所需的模块
    scp /root/containerd.conf root@$IP_HOST:/etc/modules-load.d/

    #加载模块
    ssh root@$IP_HOST "modprobe -- overlay && modprobe -- br_netfilter"
    echo "------$IP_HOST OK------"
done

配置Containerd所需内核

cat > /root/99-kubernetes-cri.conf << EOF
net.bridge.bridge-nf-call-iptables  = 1
net.ipv4.ip_forward                 = 1
net.bridge.bridge-nf-call-ip6tables = 1
EOF

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    #配置Containerd所需的内核
    scp /root/99-kubernetes-cri.conf root@$IP_HOST:/etc/sysctl.d/

    #加载内核
    ssh root@$IP_HOST "sysctl --system"
    echo "------$IP_HOST OK------"
done

配置Containerd的配置文件

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    #生成配置文件
    ssh root@$IP_HOST "mkdir -p /etc/containerd && containerd config default > /etc/containerd/config.toml"
    echo "------$IP_HOST OK------"
done

手动调整Containerd的配置文件

#vim /etc/containerd/config.toml
#找到containerd.runtimes.runc.options，添加SystemdCgroup = true（如果已存在直接修改，否则会报错）
#将sandbox_image的Pause镜像改成符合自己版本的地址registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.7
cat /etc/containerd/config.toml | grep SystemdCgroup
cat /etc/containerd/config.toml | grep sandbox_image

启动Containerd

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "systemctl daemon-reload && systemctl enable --now containerd && systemctl status containerd"
    echo "------$IP_HOST OK------"
done

配置crictl客户端连接

#配置crictl客户端连接的运行时位置
cat > /root/crictl.yaml <<EOF
runtime-endpoint: unix:///run/containerd/containerd.sock
image-endpoint: unix:///run/containerd/containerd.sock
timeout: 10
debug: false
EOF

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    scp /root/crictl.yaml root@$IP_HOST:/etc/
    echo "------$IP_HOST OK------"
done

安装Keepalived

注意：涉及所有Master节点

安装Keepalived

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "yum -y install keepalived"
    echo "------$IP_HOST OK------"
done

配置Keepalived健康检查

cat > /root/check_apiserver.sh << 'EOF'
#!/bin/bash

err=0
for k in $(seq 1 3)
do
    check_code=$(pgrep haproxy)
    if [[ $check_code == "" ]]; then
        err=$(expr $err + 1)
        sleep 1
        continue
    else
        err=0
        break
    fi
done

if [[ $err != "0" ]]; then
    echo "systemctl stop keepalived"
    /usr/bin/systemctl stop keepalived
    exit 1
else
    exit 0
fi
EOF

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    scp /root/check_apiserver.sh root@$IP_HOST:/etc/keepalived/
    ssh root@$IP_HOST "chmod +x /etc/keepalived/check_apiserver.sh"
    echo "------$IP_HOST OK------"
done

配置Keepalived(Master)

所有Master节点配置KeepAlived，配置不一样。注意节点的IP和网卡以及VIP地址。

TYPE=MASTER
NETWORK_CARD=`ip addr | grep inet | grep -v $$ | grep brd | awk -F ' ' '{print $NF}'`
LOCAL_IP_HOST=`ip addr | grep inet | grep -v $$ | grep brd | awk -F ' ' '{print $2}' | awk -F '/' '{print $1}'`
LB_IP_HOST=192.168.23.100

cat > /etc/keepalived/keepalived.conf << EOF
! Configuration File for keepalived
global_defs {
    router_id LVS_DEVEL
}
vrrp_script chk_apiserver {
    script "/etc/keepalived/check_apiserver.sh"
    interval 5 
    weight -5
    fall 2
    rise 1
}
vrrp_instance VI_1 {
    state $TYPE
    interface $NETWORK_CARD
    mcast_src_ip $LOCAL_IP_HOST
    virtual_router_id 51
    priority 101
    nopreempt
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass K8SHA_KA_AUTH
    }
    virtual_ipaddress {
        $LB_IP_HOST
    }
    track_script {
      chk_apiserver 
    }
}
EOF

配置Keepalived(Backup)

TYPE=BACKUP
NETWORK_CARD=`ip addr | grep inet | grep -v $$ | grep brd | awk -F ' ' '{print $NF}'`
LOCAL_IP_HOST=`ip addr | grep inet | grep -v $$ | grep brd | awk -F ' ' '{print $2}' | awk -F '/' '{print $1}'`
LB_IP_HOST=192.168.23.100

cat > /etc/keepalived/keepalived.conf << EOF
! Configuration File for keepalived
global_defs {
    router_id LVS_DEVEL
}
vrrp_script chk_apiserver {
    script "/etc/keepalived/check_apiserver.sh"
    interval 5 
    weight -5
    fall 2
    rise 1
}
vrrp_instance VI_1 {
    state $TYPE
    interface $NETWORK_CARD
    mcast_src_ip $LOCAL_IP_HOST
    virtual_router_id 51
    priority 100
    nopreempt
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass K8SHA_KA_AUTH
    }
    virtual_ipaddress {
        $LB_IP_HOST
    }
    track_script {
      chk_apiserver 
    }
}
EOF

启动并验证Keepalived

for IP_HOST in 192.168.23.10{1..3}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "systemctl enable --now keepalived && systemctl status keepalived"
    echo "------$IP_HOST OK------"
done

安装HAproxy

注意：涉及所有Master节点

安装HAproxy

for IP_HOST in 192.168.23.10{1..3}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "yum -y install haproxy"
    echo "------$IP_HOST OK------"
done

配置HAproxy

HOSTNAME_1=k8s-master-01
HOSTNAME_2=k8s-master-02
HOSTNAME_3=k8s-master-03
IPADDR_1=192.168.23.101
IPADDR_2=192.168.23.102
IPADDR_3=192.168.23.10

cat > /root/haproxy.cfg << EOF
global
  maxconn  2000
  ulimit-n  16384
  log  127.0.0.1 local0 err
  stats timeout 30s

defaults
  log global
  mode  http
  option  httplog
  timeout connect 5000
  timeout client  50000
  timeout server  50000
  timeout http-request 15s
  timeout http-keep-alive 15s

frontend k8s-master
  bind 0.0.0.0:8443
  bind 127.0.0.1:8443
  mode tcp
  option tcplog
  tcp-request inspect-delay 5s
  default_backend k8s-master

backend k8s-master
  mode tcp
  option tcplog
  option tcp-check
  balance roundrobin
  default-server inter 10s downinter 5s rise 2 fall 2 slowstart 60s maxconn 250 maxqueue 256 weight 100
  server $HOSTNAME_1    $IPADDR_1:6443  check
  server $HOSTNAME_2    $IPADDR_2:6443  check
  server $HOSTNAME_3    $IPADDR_3:6443  check
EOF

for IP_HOST in 192.168.23.10{1..3}; do
    echo "------$IP_HOST------"
    scp /root/haproxy.cfg root@$IP_HOST:/etc/haproxy/
    echo "------$IP_HOST OK------"
done

启动并验证HAproxy

for IP_HOST in 192.168.23.10{1..3}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "systemctl enable --now haproxy && systemctl status haproxy"
    echo "------$IP_HOST OK------"
done

安装etcd

注意：涉及所有Master节点

下载etcd

cd /opt/
wget https://github.com/etcd-io/etcd/releases/download/v3.5.4/etcd-v3.5.4-linux-amd64.tar.gz

安装etcd

for IP_HOST in 192.168.23.10{1..3}; do
    echo "------$IP_HOST------"
    scp /opt/etcd-v3.5.4-linux-amd64.tar.gz root@$IP_HOST:/root/
    ssh root@$IP_HOST "tar -zxvf etcd-v3.5.4-linux-amd64.tar.gz --strip-components=1 -C /usr/local/bin etcd-v3.5.4-linux-amd64/etcd{,ctl}"
    echo "------$IP_HOST OK------"
done

检查etcd

for IP_HOST in 192.168.23.10{1..3}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "etcd --version"
    echo "------$IP_HOST OK------"
done

安装K8S

注意：涉及所有节点

下载K8S

cd /opt/
wget https://dl.k8s.io/v1.24.0/kubernetes-server-linux-amd64.tar.gz

安装K8S

for IP_HOST in 192.168.23.10{1..3}; do
    echo "------$IP_HOST------"
    scp /opt/kubernetes-server-linux-amd64.tar.gz root@$IP_HOST:/root/
    ssh root@$IP_HOST "tar -xf kubernetes-server-linux-amd64.tar.gz  --strip-components=3 -C /usr/local/bin kubernetes/server/bin/kube{let,ctl,-apiserver,-controller-manager,-scheduler,-proxy}"
    echo "------$IP_HOST OK------"
done

for IP_HOST in 192.168.23.10{4,5}; do
    echo "------$IP_HOST------"
    scp /opt/kubernetes-server-linux-amd64.tar.gz root@$IP_HOST:/root/
    ssh root@$IP_HOST "tar -xf kubernetes-server-linux-amd64.tar.gz  --strip-components=3 -C /usr/local/bin kubernetes/server/bin/kube{let,-proxy}"
    echo "------$IP_HOST OK------"
done

检查K8S

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "kubelet --version"
    echo "------$IP_HOST OK------"
done

文件目录

注意：涉及所有节点

创建CNI目录

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "mkdir -p /opt/cni/bin"
    echo "------$IP_HOST OK------"
done

下载K8S文件

安装git工具

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "yum -y install git"
    ssh root@$IP_HOST "git config --global user.name 'wangmingqu' && git config --global user.email '[email protected]' && git init"
    echo "------$IP_HOST OK------"
done

安装文件

#参考 dotbalo 的文档，文档地址：https://github.com/dotbalo/k8s-ha-install
#git clone https://github.com/dotbalo/k8s-ha-install.git

下载k8s文件

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    scp /opt/k8s-ha-install.tar.gz root@$IP_HOST:/root/
    ssh root@$IP_HOST "tar -zxvf /opt/k8s-ha-install.tar.gz -C /root/"
    ssh root@$IP_HOST "cd /root/k8s-ha-install && git checkout manual-installation-v1.24.x"
    echo "------$IP_HOST OK------"
done

生成证书

证书工具

注意：涉及k8s-master-01节点

wget "https://pkg.cfssl.org/R1.2/cfssl_linux-amd64" -O /usr/local/bin/cfssl
wget "https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64" -O /usr/local/bin/cfssljson
chmod +x /usr/local/bin/cfssl /usr/local/bin/cfssljson

生成etcd证书

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "mkdir /etc/etcd/ssl -p"
    echo "------$IP_HOST OK------"
done

生成证书

cd /root/k8s-ha-install/pki

# 生成etcd CA证书和CA证书的key
cfssl gencert -initca etcd-ca-csr.json | cfssljson -bare /etc/etcd/ssl/etcd-ca

# 注意主机名称和主机地址
cfssl gencert \
   -ca=/etc/etcd/ssl/etcd-ca.pem \
   -ca-key=/etc/etcd/ssl/etcd-ca-key.pem \
   -config=ca-config.json \
   -hostname=127.0.0.1,k8s-master-01,k8s-master-02,k8s-master-03,192.168.23.101,192.168.23.102,192.168.23.103 \
   -profile=kubernetes \
   etcd-csr.json | cfssljson -bare /etc/etcd/ssl/etcd

分发证书

for IP_HOST in 192.168.23.10{2..5}; do
    echo "------$IP_HOST------"
    scp /etc/etcd/ssl/* root@$IP_HOST:/etc/etcd/ssl/
    echo "------$IP_HOST OK------"
done

生成K8S组件证书

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "mkdir -p /etc/kubernetes/pki"
    echo "------$IP_HOST OK------"
done

生成kubernetes证书

cd /root/k8s-ha-install/pki

cfssl gencert -initca ca-csr.json | cfssljson -bare /etc/kubernetes/pki/ca

#192.168.0.是k8s service的网段，如果说需要更改k8s service网段，那就需要更改192.168.0.1，
#如果不是高可用集群，192.168.23.100为Master01的IP
cfssl gencert \
-ca=/etc/kubernetes/pki/ca.pem \
-ca-key=/etc/kubernetes/pki/ca-key.pem \
-config=ca-config.json \
-hostname=192.168.0.1,192.168.23.100,127.0.0.1,kubernetes,kubernetes.default,kubernetes.default.svc,kubernetes.default.svc.cluster,kubernetes.default.svc.cluster.local,192.168.23.101,192.168.23.102,192.168.23.103 \
-profile=kubernetes \
apiserver-csr.json | cfssljson -bare /etc/kubernetes/pki/apiserver

生成apiserver的聚合证书

cd /root/k8s-ha-install/pki

cfssl gencert \
-initca front-proxy-ca-csr.json | cfssljson -bare /etc/kubernetes/pki/front-proxy-ca 

cfssl gencert \
-ca=/etc/kubernetes/pki/front-proxy-ca.pem \
-ca-key=/etc/kubernetes/pki/front-proxy-ca-key.pem \
-config=ca-config.json \
-profile=kubernetes \
front-proxy-client-csr.json | cfssljson -bare /etc/kubernetes/pki/front-proxy-client

由此警告结果可以忽略

# 2024/08/25 21:12:56 [INFO] generate received request
# 2024/08/25 21:12:56 [INFO] received CSR
# 2024/08/25 21:12:56 [INFO] generating key: rsa-2048
# 2024/08/25 21:12:57 [INFO] encoded CSR
# 2024/08/25 21:12:57 [INFO] signed certificate with serial number 683767219109330454087700751007901444283358948366
# 2024/08/25 21:12:57 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
# websites. For more information see the Baseline Requirements for the Issuance and Management
# of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
# specifically, section 10.2.3 ("Information Requirements").

生成controller-manage的证书

cd /root/k8s-ha-install/pki

cfssl gencert \
-ca=/etc/kubernetes/pki/ca.pem \
-ca-key=/etc/kubernetes/pki/ca-key.pem \
-config=ca-config.json \
-profile=kubernetes \
manager-csr.json | cfssljson -bare /etc/kubernetes/pki/controller-manager


# 注意，如果不是高可用集群，192.168.23.100:8443改为k8s-master-01的地址，8443改为apiserver的端口，默认是6443
# set-cluster：设置一个集群项
kubectl config set-cluster kubernetes \
--certificate-authority=/etc/kubernetes/pki/ca.pem \
--embed-certs=true \
--server=https://192.168.23.100:8443 \
--kubeconfig=/etc/kubernetes/controller-manager.kubeconfig


# 设置一个环境项，一个上下文
kubectl config set-context system:kube-controller-manager@kubernetes \
--cluster=kubernetes \
--user=system:kube-controller-manager \
--kubeconfig=/etc/kubernetes/controller-manager.kubeconfig


# set-credentials 设置一个用户项
kubectl config set-credentials system:kube-controller-manager \
--client-certificate=/etc/kubernetes/pki/controller-manager.pem \
--client-key=/etc/kubernetes/pki/controller-manager-key.pem \
--embed-certs=true \
--kubeconfig=/etc/kubernetes/controller-manager.kubeconfig


# 使用某个环境当做默认环境
kubectl config use-context system:kube-controller-manager@kubernetes \
--kubeconfig=/etc/kubernetes/controller-manager.kubeconfig

生成scheduler的证书

cd /root/k8s-ha-install/pki

cfssl gencert \
-ca=/etc/kubernetes/pki/ca.pem \
-ca-key=/etc/kubernetes/pki/ca-key.pem \
-config=ca-config.json \
-profile=kubernetes \
scheduler-csr.json | cfssljson -bare /etc/kubernetes/pki/scheduler


# 注意，如果不是高可用集群，192.168.23.100:8443改为k8s-master-01的地址，8443改为apiserver的端口，默认是6443
# set-cluster：设置一个集群项
kubectl config set-cluster kubernetes \
--certificate-authority=/etc/kubernetes/pki/ca.pem \
--embed-certs=true \
--server=https://192.168.23.100:8443 \
--kubeconfig=/etc/kubernetes/scheduler.kubeconfig


# set-credentials 设置一个用户项
kubectl config set-credentials system:kube-scheduler \
--client-certificate=/etc/kubernetes/pki/scheduler.pem \
--client-key=/etc/kubernetes/pki/scheduler-key.pem \
--embed-certs=true \
--kubeconfig=/etc/kubernetes/scheduler.kubeconfig


# 设置一个环境项，一个上下文
kubectl config set-context system:kube-scheduler@kubernetes \
--cluster=kubernetes \
--user=system:kube-scheduler \
--kubeconfig=/etc/kubernetes/scheduler.kubeconfig


# 使用某个环境当做默认环境
kubectl config use-context system:kube-scheduler@kubernetes \
--kubeconfig=/etc/kubernetes/scheduler.kubeconfig

生成admin的证书

cd /root/k8s-ha-install/pki

cfssl gencert \
-ca=/etc/kubernetes/pki/ca.pem \
-ca-key=/etc/kubernetes/pki/ca-key.pem \
-config=ca-config.json \
-profile=kubernetes \
admin-csr.json | cfssljson -bare /etc/kubernetes/pki/admin


# 注意，如果不是高可用集群，192.168.23.100:8443改为k8s-master-01的地址，8443改为apiserver的端口，默认是6443
# set-cluster：设置一个集群项
kubectl config set-cluster kubernetes \
--certificate-authority=/etc/kubernetes/pki/ca.pem \
--embed-certs=true \
--server=https://192.168.23.100:8443 \
--kubeconfig=/etc/kubernetes/admin.kubeconfig


# set-credentials 设置一个用户项
kubectl config set-credentials kubernetes-admin \
--client-certificate=/etc/kubernetes/pki/admin.pem \
--client-key=/etc/kubernetes/pki/admin-key.pem \
--embed-certs=true \
--kubeconfig=/etc/kubernetes/admin.kubeconfig


# 设置一个环境项，一个上下文
kubectl config set-context kubernetes-admin@kubernetes \
--cluster=kubernetes \
--user=kubernetes-admin \
--kubeconfig=/etc/kubernetes/admin.kubeconfig


# 使用某个环境当做默认环境
kubectl config use-context kubernetes-admin@kubernetes \
--kubeconfig=/etc/kubernetes/admin.kubeconfig

创建ServiceAccount Key > secret

openssl genrsa -out /etc/kubernetes/pki/sa.key 2048
openssl rsa -in /etc/kubernetes/pki/sa.key -pubout -out /etc/kubernetes/pki/sa.pub

分发证书-分发到Master

for IP_HOST in 192.168.23.10{2,3}; do
    echo "------$IP_HOST------"
    scp /etc/kubernetes/* root@$IP_HOST:/etc/kubernetes/
    scp /etc/kubernetes/pki/* root@$IP_HOST:/etc/kubernetes/pki/
    echo "------$IP_HOST OK------"
done

分发证书-分发到Node

for IP_HOST in 192.168.23.10{4,5}; do
    echo "------$IP_HOST------"
    scp /etc/kubernetes/pki/{ca,ca-key,front-proxy-ca}.pem root@$IP_HOST:/etc/kubernetes/pki/
    echo "------$IP_HOST OK------"
done

集群配置

目录准备

注意：涉及所有节点

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "mkdir -p /etc/kubernetes/manifests/ /etc/systemd/system/kubelet.service.d /var/lib/kubelet /var/log/kubernetes"
    echo "------$IP_HOST OK------"
done

etcd配置

注意：涉及所有Master节点
etcd配置大致相同，注意修改每个Master节点的etcd配置的主机名和IP地址。

k8s-master-01配置

cat > /etc/etcd/etcd.config.yml << EOF
name: 'k8s-master-01'
data-dir: /var/lib/etcd
wal-dir: /var/lib/etcd/wal
snapshot-count: 5000
heartbeat-interval: 100
election-timeout: 1000
quota-backend-bytes: 0
listen-peer-urls: 'https://192.168.23.101:2380'
listen-client-urls: 'https://192.168.23.101:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://192.168.23.101:2380'
advertise-client-urls: 'https://192.168.23.101:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-master-01=https://192.168.23.101:2380,k8s-master-02=https://192.168.23.102:2380,k8s-master-03=https://192.168.23.103:2380'
initial-cluster-token: 'etcd-k8s-cluster'
initial-cluster-state: 'new'
strict-reconfig-check: false
enable-v2: true
enable-pprof: true
proxy: 'off'
proxy-failure-wait: 5000
proxy-refresh-interval: 30000
proxy-dial-timeout: 1000
proxy-write-timeout: 5000
proxy-read-timeout: 0
client-transport-security:
  cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
  key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
  client-cert-auth: true
  trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
  auto-tls: true
peer-transport-security:
  cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
  key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
  peer-client-cert-auth: true
  trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
  auto-tls: true
debug: false
log-package-levels:
log-outputs: [default]
force-new-cluster: false
EOF

k8s-master-02配置

cat > /etc/etcd/etcd.config.yml << EOF
name: 'k8s-master-02'
data-dir: /var/lib/etcd
wal-dir: /var/lib/etcd/wal
snapshot-count: 5000
heartbeat-interval: 100
election-timeout: 1000
quota-backend-bytes: 0
listen-peer-urls: 'https://192.168.23.102:2380'
listen-client-urls: 'https://192.168.23.102:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://192.168.23.102:2380'
advertise-client-urls: 'https://192.168.23.102:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-master-01=https://192.168.23.101:2380,k8s-master-02=https://192.168.23.102:2380,k8s-master-03=https://192.168.23.103:2380'
initial-cluster-token: 'etcd-k8s-cluster'
initial-cluster-state: 'new'
strict-reconfig-check: false
enable-v2: true
enable-pprof: true
proxy: 'off'
proxy-failure-wait: 5000
proxy-refresh-interval: 30000
proxy-dial-timeout: 1000
proxy-write-timeout: 5000
proxy-read-timeout: 0
client-transport-security:
  cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
  key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
  client-cert-auth: true
  trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
  auto-tls: true
peer-transport-security:
  cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
  key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
  peer-client-cert-auth: true
  trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
  auto-tls: true
debug: false
log-package-levels:
log-outputs: [default]
force-new-cluster: false
EOF

k8s-master-03配置

cat > /etc/etcd/etcd.config.yml << EOF
name: 'k8s-master-03'
data-dir: /var/lib/etcd
wal-dir: /var/lib/etcd/wal
snapshot-count: 5000
heartbeat-interval: 100
election-timeout: 1000
quota-backend-bytes: 0
listen-peer-urls: 'https://192.168.23.103:2380'
listen-client-urls: 'https://192.168.23.103:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://192.168.23.103:2380'
advertise-client-urls: 'https://192.168.23.103:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-master-01=https://192.168.23.101:2380,k8s-master-02=https://192.168.23.102:2380,k8s-master-03=https://192.168.23.103:2380'
initial-cluster-token: 'etcd-k8s-cluster'
initial-cluster-state: 'new'
strict-reconfig-check: false
enable-v2: true
enable-pprof: true
proxy: 'off'
proxy-failure-wait: 5000
proxy-refresh-interval: 30000
proxy-dial-timeout: 1000
proxy-write-timeout: 5000
proxy-read-timeout: 0
client-transport-security:
  cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
  key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
  client-cert-auth: true
  trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
  auto-tls: true
peer-transport-security:
  cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
  key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
  peer-client-cert-auth: true
  trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
  auto-tls: true
debug: false
log-package-levels:
log-outputs: [default]
force-new-cluster: false
EOF

创建etcd service并启动

cat > /root/etcd.service << EOF
[Unit]
Description=Etcd Service
Documentation=https://coreos.com/etcd/docs/latest/
After=network.target

[Service]
Type=notify
ExecStart=/usr/local/bin/etcd --config-file=/etc/etcd/etcd.config.yml
Restart=on-failure
RestartSec=10
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
Alias=etcd3.service
EOF

#分发配置
for IP_HOST in 192.168.23.10{1..3}; do
    echo "------$IP_HOST------"
    scp /root/etcd.service root@$IP_HOST:/usr/lib/systemd/system/
    echo "------$IP_HOST OK------"
done

for IP_HOST in 192.168.23.10{1..3}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "mkdir -p /etc/kubernetes/pki/etcd"
    ssh root@$IP_HOST "ln -s /etc/etcd/ssl/* /etc/kubernetes/pki/etcd/"
    ssh root@$IP_HOST "systemctl daemon-reload && systemctl enable --now etcd && systemctl status etcd"
    echo "------$IP_HOST OK------"
done

检查集群

export ETCDCTL_API=3
etcdctl --endpoints="192.168.23.103:2379,192.168.23.102:2379,192.168.23.101:2379" \
--cacert=/etc/kubernetes/pki/etcd/etcd-ca.pem \
--cert=/etc/kubernetes/pki/etcd/etcd.pem \
--key=/etc/kubernetes/pki/etcd/etcd-key.pem \
endpoint status --write-out=table

apiserver配置

注意：涉及所有Master节点
所有Master节点创建kube-apiserver service，# 注意，如果不是高可用集群，192.168.23.100改为k8s-master-01的地址。
注意本文档使用的k8s service网段为192.168.0.0/16，该网段不能和宿主机的网段、Pod网段的重复，请按需修改**。**

k8s-master-01

cat > /usr/lib/systemd/system/kube-apiserver.service << EOF

[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target

[Service]
ExecStart=/usr/local/bin/kube-apiserver \
      --v=2  \
      --logtostderr=true  \
      --allow-privileged=true  \
      --bind-address=0.0.0.0  \
      --secure-port=6443  \
      --advertise-address=192.168.23.101 \
      --service-cluster-ip-range=192.168.0.0/16  \
      --service-node-port-range=30000-32767  \
      --etcd-servers=https://192.168.23.101:2379,https://192.168.23.102:2379,https://192.168.23.103:2379 \
      --etcd-cafile=/etc/etcd/ssl/etcd-ca.pem  \
      --etcd-certfile=/etc/etcd/ssl/etcd.pem  \
      --etcd-keyfile=/etc/etcd/ssl/etcd-key.pem  \
      --client-ca-file=/etc/kubernetes/pki/ca.pem  \
      --tls-cert-file=/etc/kubernetes/pki/apiserver.pem  \
      --tls-private-key-file=/etc/kubernetes/pki/apiserver-key.pem  \
      --kubelet-client-certificate=/etc/kubernetes/pki/apiserver.pem  \
      --kubelet-client-key=/etc/kubernetes/pki/apiserver-key.pem  \
      --service-account-key-file=/etc/kubernetes/pki/sa.pub  \
      --service-account-signing-key-file=/etc/kubernetes/pki/sa.key  \
      --service-account-issuer=https://kubernetes.default.svc.cluster.local \
      --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname  \
      --enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota  \
	  --feature-gates=LegacyServiceAccountTokenNoAutoGeneration=false \
      --authorization-mode=Node,RBAC  \
      --enable-bootstrap-token-auth=true  \
      --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem  \
      --proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.pem  \
      --proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client-key.pem  \
      --requestheader-allowed-names=aggregator  \
      --requestheader-group-headers=X-Remote-Group  \
      --requestheader-extra-headers-prefix=X-Remote-Extra-  \
      --requestheader-username-headers=X-Remote-User
      # --token-auth-file=/etc/kubernetes/token.csv

Restart=on-failure
RestartSec=10s
LimitNOFILE=65535

[Install]
WantedBy=multi-user.target
EOF

k8s-master-02

cat > /usr/lib/systemd/system/kube-apiserver.service << EOF

[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target

[Service]
ExecStart=/usr/local/bin/kube-apiserver \
      --v=2  \
      --logtostderr=true  \
      --allow-privileged=true  \
      --bind-address=0.0.0.0  \
      --secure-port=6443  \
      --advertise-address=192.168.23.102 \
      --service-cluster-ip-range=192.168.0.0/16  \
      --service-node-port-range=30000-32767  \
      --etcd-servers=https://192.168.23.101:2379,https://192.168.23.102:2379,https://192.168.23.103:2379 \
      --etcd-cafile=/etc/etcd/ssl/etcd-ca.pem  \
      --etcd-certfile=/etc/etcd/ssl/etcd.pem  \
      --etcd-keyfile=/etc/etcd/ssl/etcd-key.pem  \
      --client-ca-file=/etc/kubernetes/pki/ca.pem  \
      --tls-cert-file=/etc/kubernetes/pki/apiserver.pem  \
      --tls-private-key-file=/etc/kubernetes/pki/apiserver-key.pem  \
      --kubelet-client-certificate=/etc/kubernetes/pki/apiserver.pem  \
      --kubelet-client-key=/etc/kubernetes/pki/apiserver-key.pem  \
      --service-account-key-file=/etc/kubernetes/pki/sa.pub  \
      --service-account-signing-key-file=/etc/kubernetes/pki/sa.key  \
      --service-account-issuer=https://kubernetes.default.svc.cluster.local \
      --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname  \
      --enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota  \
	  --feature-gates=LegacyServiceAccountTokenNoAutoGeneration=false \
      --authorization-mode=Node,RBAC  \
      --enable-bootstrap-token-auth=true  \
      --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem  \
      --proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.pem  \
      --proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client-key.pem  \
      --requestheader-allowed-names=aggregator  \
      --requestheader-group-headers=X-Remote-Group  \
      --requestheader-extra-headers-prefix=X-Remote-Extra-  \
      --requestheader-username-headers=X-Remote-User
      # --token-auth-file=/etc/kubernetes/token.csv

Restart=on-failure
RestartSec=10s
LimitNOFILE=65535

[Install]
WantedBy=multi-user.target
EOF

k8s-master-03

cat > /usr/lib/systemd/system/kube-apiserver.service << EOF

[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target

[Service]
ExecStart=/usr/local/bin/kube-apiserver \
      --v=2  \
      --logtostderr=true  \
      --allow-privileged=true  \
      --bind-address=0.0.0.0  \
      --secure-port=6443  \
      --advertise-address=192.168.23.103  \
      --service-cluster-ip-range=192.168.0.0/16  \
      --service-node-port-range=30000-32767  \
      --etcd-servers=https://192.168.23.101:2379,https://192.168.23.102:2379,https://192.168.23.103:2379 \
      --etcd-cafile=/etc/etcd/ssl/etcd-ca.pem  \
      --etcd-certfile=/etc/etcd/ssl/etcd.pem  \
      --etcd-keyfile=/etc/etcd/ssl/etcd-key.pem  \
      --client-ca-file=/etc/kubernetes/pki/ca.pem  \
      --tls-cert-file=/etc/kubernetes/pki/apiserver.pem  \
      --tls-private-key-file=/etc/kubernetes/pki/apiserver-key.pem  \
      --kubelet-client-certificate=/etc/kubernetes/pki/apiserver.pem  \
      --kubelet-client-key=/etc/kubernetes/pki/apiserver-key.pem  \
      --service-account-key-file=/etc/kubernetes/pki/sa.pub  \
      --service-account-signing-key-file=/etc/kubernetes/pki/sa.key  \
      --service-account-issuer=https://kubernetes.default.svc.cluster.local \
      --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname  \
      --enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota  \
	  --feature-gates=LegacyServiceAccountTokenNoAutoGeneration=false \
      --authorization-mode=Node,RBAC  \
      --enable-bootstrap-token-auth=true  \
      --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem  \
      --proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.pem  \
      --proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client-key.pem  \
      --requestheader-allowed-names=aggregator  \
      --requestheader-group-headers=X-Remote-Group  \
      --requestheader-extra-headers-prefix=X-Remote-Extra-  \
      --requestheader-username-headers=X-Remote-User
      # --token-auth-file=/etc/kubernetes/token.csv

Restart=on-failure
RestartSec=10s
LimitNOFILE=65535

[Install]
WantedBy=multi-user.target
EOF

开启kube-apiserver

for IP_HOST in 192.168.23.10{1..3}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "systemctl daemon-reload && systemctl enable --now kube-apiserver"
    ssh root@$IP_HOST "systemctl status kube-apiserver"
    echo "------$IP_HOST OK------"
done

controllerManager配置

注意：涉及所有Master节点
注意本文档使用的k8s Pod网段为172.16.0.0/12，该网段不能和宿主机的网段、k8s Service网段的重复，请按需修改。
所有Master节点配置kube-controller-manager service（所有master节点配置一样）。

配置kube-controller-manager service

cat > /root/kube-controller-manager.service << EOF
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes
After=network.target

[Service]
ExecStart=/usr/local/bin/kube-controller-manager \
      --v=2 \
      --logtostderr=true \
      --root-ca-file=/etc/kubernetes/pki/ca.pem \
      --cluster-signing-cert-file=/etc/kubernetes/pki/ca.pem \
      --cluster-signing-key-file=/etc/kubernetes/pki/ca-key.pem \
      --service-account-private-key-file=/etc/kubernetes/pki/sa.key \
      --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig \
	  --feature-gates=LegacyServiceAccountTokenNoAutoGeneration=false \
      --leader-elect=true \
      --use-service-account-credentials=true \
      --node-monitor-grace-period=40s \
      --node-monitor-period=5s \
      --pod-eviction-timeout=2m0s \
      --controllers=*,bootstrapsigner,tokencleaner \
      --allocate-node-cidrs=true \
      --cluster-cidr=172.16.0.0/12 \
      --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem \
      --node-cidr-mask-size=24
      
Restart=always
RestartSec=10s

[Install]
WantedBy=multi-user.target
EOF

分发配置

for IP_HOST in 192.168.23.10{1..3}; do
    echo "------$IP_HOST------"
    scp /root/kube-controller-manager.service root@$IP_HOST:/usr/lib/systemd/system/
    echo "------$IP_HOST OK------"
done

启动kube-controller-manager

for IP_HOST in 192.168.23.10{1..3}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "systemctl daemon-reload && systemctl enable --now kube-controller-manager"
    ssh root@$IP_HOST "systemctl  status kube-controller-manager"
    echo "------$IP_HOST OK------"
done

sheduler配置

注意：涉及所有Master节点
所有Master节点配置kube-scheduler service（所有master节点配置一样）。

配置kube-scheduler service

cat > /root/kube-scheduler.service << EOF
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes
After=network.target

[Service]
ExecStart=/usr/local/bin/kube-scheduler \
      --v=2 \
      --logtostderr=true \
      --leader-elect=true \
      --authentication-kubeconfig=/etc/kubernetes/scheduler.kubeconfig \
      --authorization-kubeconfig=/etc/kubernetes/scheduler.kubeconfig \
      --kubeconfig=/etc/kubernetes/scheduler.kubeconfig

Restart=always
RestartSec=10s

[Install]
WantedBy=multi-user.target

EOF

分发配置

for IP_HOST in 192.168.23.10{1..3}; do
    echo "------$IP_HOST------"
    scp /root/kube-scheduler.service root@$IP_HOST:/usr/lib/systemd/system/
    echo "------$IP_HOST OK------"
done

启动kube-scheduler

for IP_HOST in 192.168.23.10{1..3}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "systemctl daemon-reload && systemctl enable --now kube-scheduler"
    ssh root@$IP_HOST "systemctl status kube-scheduler"
    echo "------$IP_HOST OK------"
done

TLS Bootstrapping配置

注意：只需要在k8s-master-01创建bootstrap
如果不是高可用集群，192.168.23.100:8443改为k8s-master-01的地址，8443改为apiserver的端口，默认是6443。
注意：如果要修改bootstrap.secret.yaml的token-id和token-secret，需要保证下图红圈内的字符串一致的，并且位数是一样的。还要保证上个命令：c8ad9c.2e4d610cf3e7426e与你修改的字符串要一致。

创建bootstrap证书

cd /root/k8s-ha-install/bootstrap

#注意此处的地址，按需修改
kubectl config set-cluster kubernetes \
--certificate-authority=/etc/kubernetes/pki/ca.pem \
--embed-certs=true \
--server=https://192.168.23.100:8443 \
--kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig

#注意此处的token，要检查/root/k8s-ha-install/bootstrap/bootstrap.secret.yaml文件中的是否一致
kubectl config set-credentials tls-bootstrap-token-user \
--token=c8ad9c.2e4d610cf3e7426e \
--kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig

kubectl config set-context tls-bootstrap-token-user@kubernetes \
--cluster=kubernetes \
--user=tls-bootstrap-token-user \
--kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig

kubectl config use-context tls-bootstrap-token-user@kubernetes \
--kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig

token图示

配置kubectl命令

mkdir -p /root/.kube ; cp /etc/kubernetes/admin.kubeconfig /root/.kube/config

配置kubectl命令补全

yum -y install bash-completion
source /usr/share/bash-completion/bash_completion
source <(kubectl completion bash)
echo "source <(kubectl completion bash)" >> ~/.bashrc

查询集群状态

kubectl get cs
# Warning: v1 ComponentStatus is deprecated in v1.19+
# NAME                 STATUS    MESSAGE                         ERROR
# controller-manager   Healthy   ok                              
# scheduler            Healthy   ok                              
# etcd-1               Healthy   {"health":"true","reason":""}   
# etcd-0               Healthy   {"health":"true","reason":""}   
# etcd-2               Healthy   {"health":"true","reason":""}

创建bootstrap

cd /root/k8s-ha-install/bootstrap
kubectl create -f bootstrap.secret.yaml

分发证书

for IP_HOST in 192.168.23.10{2..5}; do
    echo "------$IP_HOST------"
    scp /etc/kubernetes/bootstrap-kubelet.kubeconfig root@$IP_HOST:/etc/kubernetes/
    echo "------$IP_HOST OK------"
done

kubelet配置

注意：涉及所有节点
如果更改了k8s的service网段，需要更改kubelet-conf.yml 的clusterDNS:配置，改成k8s Service网段的第十个地址，比如192.168.0.10

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "mkdir -p /var/lib/kubelet /var/log/kubernetes /etc/systemd/system/kubelet.service.d /etc/kubernetes/manifests/"
    echo "------$IP_HOST OK------"
done

配置kubelet service

cat > /root/kubelet.service << EOF

[Unit]
Description=Kubernetes Kubelet
Documentation=https://github.com/kubernetes/kubernetes

[Service]
ExecStart=/usr/local/bin/kubelet

Restart=always
StartLimitInterval=0
RestartSec=10

[Install]
WantedBy=multi-user.target
EOF

如果Runtime为Containerd，请添加如下Kubelet的配置（本次使用的是Containerd所以添加如下配置）

# Runtime为Containerd
cat > /root/10-kubelet.conf << 'EOF'
[Service]
Environment="KUBELET_KUBECONFIG_ARGS=--bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig --kubeconfig=/etc/kubernetes/kubelet.kubeconfig"
Environment="KUBELET_SYSTEM_ARGS=--container-runtime=remote --runtime-request-timeout=15m --container-runtime-endpoint=unix:///run/containerd/containerd.sock"
Environment="KUBELET_CONFIG_ARGS=--config=/etc/kubernetes/kubelet-conf.yml"
Environment="KUBELET_EXTRA_ARGS=--node-labels=node.kubernetes.io/node='' "
ExecStart=
ExecStart=/usr/local/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_SYSTEM_ARGS $KUBELET_EXTRA_ARGS
EOF

创建kubelet配置文件

注意此处clusterDNS的IP地址

cat > /root/kubelet-conf.yml << EOF
apiVersion: kubelet.config.k8s.io/v1beta1
kind: KubeletConfiguration
address: 0.0.0.0
port: 10250
readOnlyPort: 10255
authentication:
  anonymous:
    enabled: false
  webhook:
    cacheTTL: 2m0s
    enabled: true
  x509:
    clientCAFile: /etc/kubernetes/pki/ca.pem
authorization:
  mode: Webhook
  webhook:
    cacheAuthorizedTTL: 5m0s
    cacheUnauthorizedTTL: 30s
cgroupDriver: systemd
cgroupsPerQOS: true
clusterDNS:
- 192.168.0.10
clusterDomain: cluster.local
containerLogMaxFiles: 5
containerLogMaxSize: 10Mi
contentType: application/vnd.kubernetes.protobuf
cpuCFSQuota: true
cpuManagerPolicy: none
cpuManagerReconcilePeriod: 10s
enableControllerAttachDetach: true
enableDebuggingHandlers: true
enforceNodeAllocatable:
- pods
eventBurst: 10
eventRecordQPS: 5
evictionHard:
  imagefs.available: 15%
  memory.available: 100Mi
  nodefs.available: 10%
  nodefs.inodesFree: 5%
evictionPressureTransitionPeriod: 5m0s
failSwapOn: true
fileCheckFrequency: 20s
hairpinMode: promiscuous-bridge
healthzBindAddress: 127.0.0.1
healthzPort: 10248
httpCheckFrequency: 20s
imageGCHighThresholdPercent: 85
imageGCLowThresholdPercent: 80
imageMinimumGCAge: 2m0s
iptablesDropBit: 15
iptablesMasqueradeBit: 14
kubeAPIBurst: 10
kubeAPIQPS: 5
makeIPTablesUtilChains: true
maxOpenFiles: 1000000
maxPods: 110
nodeStatusUpdateFrequency: 10s
oomScoreAdj: -999
podPidsLimit: -1
registryBurst: 10
registryPullQPS: 5
resolvConf: /etc/resolv.conf
rotateCertificates: true
runtimeRequestTimeout: 2m0s
serializeImagePulls: true
staticPodPath: /etc/kubernetes/manifests
streamingConnectionIdleTimeout: 4h0m0s
syncFrequency: 1m0s
volumeStatsAggPeriod: 1m0s
EOF

分发配置

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    scp /root/kubelet.service $IP_HOST:/usr/lib/systemd/system/
    scp /root/10-kubelet.conf $IP_HOST:/etc/systemd/system/kubelet.service.d/
    scp /root/kubelet-conf.yml $IP_HOST:/etc/kubernetes/
    echo "------$IP_HOST OK------"
done

启动kubelet

for IP_HOST in 192.168.23.10{1..5}; do
    echo "------$IP_HOST------"
    ssh root@$IP_HOST "systemctl daemon-reload && systemctl enable --now kubelet"
    ssh root@$IP_HOST "systemctl status kubelet"
    echo "------$IP_HOST OK------"
done

kube-proxy配置

注意：涉及所有节点
如果不是高可用集群，192.168.23.100:8443改为master01的地址，8443改为apiserver的端口，默认是6443

创建证书

cd /root/k8s-ha-install
kubectl -n kube-system create serviceaccount kube-proxy

kubectl create clusterrolebinding system:kube-proxy \
--clusterrole system:node-proxier \
--serviceaccount kube-system:kube-proxy

SECRET=$(kubectl -n kube-system get sa/kube-proxy \
--output=jsonpath='{.secrets[0].name}')

JWT_TOKEN=$(kubectl -n kube-system get secret/$SECRET \
--output=jsonpath='{.data.token}' | base64 -d)

PKI_DIR=/etc/kubernetes/pki
K8S_DIR=/etc/kubernetes

kubectl config set-cluster kubernetes \
--certificate-authority=/etc/kubernetes/pki/ca.pem \
--embed-certs=true \
--server=https://192.168.23.100:8443 \
--kubeconfig=${K8S_DIR}/kube-proxy.kubeconfig

kubectl config set-credentials kubernetes \
--token=${JWT_TOKEN} \
--kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig

kubectl config set-context kubernetes \
--cluster=kubernetes \
--user=kubernetes \
--kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig

kubectl config use-context kubernetes \
--kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig

分发证书

for IP_HOST in 192.168.23.10{2..5}; do
     echo "------$IP_HOST------"
     scp /etc/kubernetes/kube-proxy.kubeconfig root@$IP_HOST:/etc/kubernetes/kube-proxy.kubeconfig
     echo "------$IP_HOST OK------"
done

创建kube-proxy service文件

cat > /root/kube-proxy.service << EOF

[Unit]
Description=Kubernetes Kube Proxy
Documentation=https://github.com/kubernetes/kubernetes
After=network.target

[Service]
ExecStart=/usr/local/bin/kube-proxy \
  --config=/etc/kubernetes/kube-proxy.yaml \
  --v=2

Restart=always
RestartSec=10s

[Install]
WantedBy=multi-user.target
EOF

创建kube-proxy的配置

如果更改了集群Pod的网段，需要更改kube-proxy.yaml的clusterCIDR为自己的Pod网段

cat > /root/kube-proxy.yaml << EOF

apiVersion: kubeproxy.config.k8s.io/v1alpha1
bindAddress: 0.0.0.0
clientConnection:
  acceptContentTypes: ""
  burst: 10
  contentType: application/vnd.kubernetes.protobuf
  kubeconfig: /etc/kubernetes/kube-proxy.kubeconfig
  qps: 5
clusterCIDR: 172.16.0.0/12 
configSyncPeriod: 15m0s
conntrack:
  max: null
  maxPerCore: 32768
  min: 131072
  tcpCloseWaitTimeout: 1h0m0s
  tcpEstablishedTimeout: 24h0m0s
enableProfiling: false
healthzBindAddress: 0.0.0.0:10256
hostnameOverride: ""
iptables:
  masqueradeAll: false
  masqueradeBit: 14
  minSyncPeriod: 0s
  syncPeriod: 30s
ipvs:
  masqueradeAll: true
  minSyncPeriod: 5s
  scheduler: "rr"
  syncPeriod: 30s
kind: KubeProxyConfiguration
metricsBindAddress: 127.0.0.1:10249
mode: "ipvs"
nodePortAddresses: null
oomScoreAdj: -999
portRange: ""
udpIdleTimeout: 250ms
EOF

分发配置

for IP_HOST in 192.168.23.10{2..5}; do
     echo "------$IP_HOST------"
     scp /root/kube-proxy.service root@$IP_HOST:/usr/lib/systemd/system/
     scp /root/kube-proxy.yaml root@$IP_HOST:/etc/kubernetes/
     echo "------$IP_HOST OK------"
done

启动并验证kube-proxy

for IP_HOST in 192.168.23.10{2..5}; do
     echo "------$IP_HOST------"
     ssh root@$IP_HOST "systemctl daemon-reload && systemctl enable --now kube-proxy && systemctl status kube-proxy"
     echo "------$IP_HOST OK------"
done

集群组件

注意：只需要在k8s-master-01上执行

calico

创建calico

注意：涉及k8s-master-01主机

cd /root/k8s-ha-install/calico/

#更改calico的网段，改为自己的Pod网段
sed -i "s#POD_CIDR#172.16.0.0/12#g" calico.yaml

#检查网段是自己的Pod网段
grep "IPV4POOL_CIDR" calico.yaml  -A 1

#创建calico
kubectl apply -f calico.yaml

查看容器状态

kubectl get po -n kube-system

如果容器状态异常可以使用kubectl describe 或者kubectl logs查看容器的日志。

coredns

修改coredns配置

cd /root/k8s-ha-install/

#如果更改了k8s service的网段需要将coredns的serviceIP改成k8s service网段的第十个IP
COREDNS_SERVICE_IP=`kubectl get svc | grep kubernetes | awk '{print $3}'`0
sed -i "s#KUBEDNS_SERVICE_IP#${COREDNS_SERVICE_IP}#g" CoreDNS/coredns.yaml

安装coredns

kubectl  create -f CoreDNS/coredns.yaml 
# serviceaccount/coredns created
# clusterrole.rbac.authorization.k8s.io/system:coredns created
# clusterrolebinding.rbac.authorization.k8s.io/system:coredns created
# configmap/coredns created
# deployment.apps/coredns created
# service/kube-dns created

检查容器状态

kubectl get po -n kube-system -l k8s-app=kube-dns

更新coredns（根据自身情况更新）

COREDNS_SERVICE_IP=`kubectl get svc | grep kubernetes | awk '{print $3}'`0

git clone https://github.com/coredns/deployment.git
cd deployment/kubernetes
./deploy.sh -s -i ${COREDNS_SERVICE_IP} | kubectl apply -f -

metrice server

安装metrics server

cd /root/k8s-ha-install/metrics-server

kubectl  create -f .

查看状态

kubectl top node

dashboard

安装dashboard

cd /root/k8s-ha-install/dashboard/

kubectl  create -f .

安装dashboard最新版

官方GitHub地址：https://github.com/kubernetes/dashboard

kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.3/aio/deploy/recommended.yaml

创建管理员用户

cat > admin.yaml << EOF
apiVersion: v1
kind: ServiceAccount
metadata:
  name: admin-user
  namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding 
metadata: 
  name: admin-user
  annotations:
    rbac.authorization.kubernetes.io/autoupdate: "true"
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
- kind: ServiceAccount
  name: admin-user
  namespace: kube-system
EOF

kubectl apply -f admin.yaml -n kube-system

dashboard的svc为NodePort

kubectl edit svc kubernetes-dashboard -n kubernetes-dashboard

将ClusterIP更改为NodePort（如果已经为NodePort忽略此步骤）

查看dashboard的端口

kubectl get svc kubernetes-dashboard -n kubernetes-dashboard

查看登录密码

kubectl -n kube-system describe secret $(kubectl -n kube-system get secret | grep admin-user | awk '{print $1}')

登录dashboard设置

在谷歌浏览器（Chrome）启动文件中加入启动参数，用于解决无法访问Dashboard的问题，参考图：

访问并登录dashboard

集群验证

查看集群中所有容器

查看集群中所有容器是否启动

kubectl get pod --all-namespaces

查看集群中主要Service

查看Cluster的Service

kubectl get service

查看DNS的Service

kubectl get service -n kube-system

查看集群中节点网络是否通

查看集群中pod运行节点

kubectl get pod --all-namespaces -owide

ping测试任意ip地址

ping 83.12.151.130

查看集群中所有节点状态

kubectl get nodes

验证要求

Pod必须能解析Service
Pod必须能解析跨namespace的Service
每个节点都必须要能访问Kubernetes的kubernetes svc 443和kube-dns的service 53
Pod和Pod之前要能通
1. 同namespace能通信
2. 跨namespace能通信
3. 跨机器能通信