一、环境确认

root@k8s-master:~# cat /etc/os-release 
NAME="Ubuntu"
VERSION="20.04.6 LTS (Focal Fossa)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 20.04.6 LTS"
VERSION_ID="20.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=focal
UBUNTU_CODENAME=focal
root@k8s-master:~# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN group default qlen 1000
    link/ether 00:0c:29:34:04:9e brd ff:ff:ff:ff:ff:ff
    inet 192.168.111.111/24 brd 192.168.111.255 scope global ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe34:49e/64 scope link 
       valid_lft forever preferred_lft forever

二、编辑文件

root@k8s-master:~# vim /etc/netplan/00-installer-config.yaml 

# This is the network config written by 'subiquity'
network:
  ethernets:
    ens33:
      addresses:
      - 192.168.111.150/24
      gateway4: 192.168.111.2
      nameservers:
        addresses:
        - 223.5.5.5
        search: []
  version: 2
##这是静态IP的格式，修改为你需要的网段

三、重新连接网络

root@k8s-master:~# netplan apply #重新连接网络
root@k8s-master:~# ip addr       #查看IP是否有变化
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN group default qlen 1000
    link/ether 00:0c:29:34:04:9e brd ff:ff:ff:ff:ff:ff
    inet 192.168.111.150/24 brd 192.168.111.255 scope global ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe34:49e/64 scope link 
       valid_lft forever preferred_lft forever