升级说明
Kubernetes 集群小版本升级基本上是只需要 要更新二进制文件即可。如果大版本升级需要注意kubelet参数的变化，以及其他组件升级之后的变化。 由于Kubernete版本更新过快许多依赖并没有解决完善，并不建议生产环境使用较新版本。
生产环境升级建议再测试环境反复测试验证
https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.21.md#downloads-for-v1217
| 组件 | 升级前 | 升级后 |
|---|---|---|
| Etcd | 3.4.13 | 无需升级 |
| kube-apiserver | 1.20.13 | 1.21.7 |
| kube-scheduler | 1.20.13 | 1.21.7 |
| kube-controller-manager | 1.20.13 | 1.21.7 |
| kubectl | 1.20.13 | 1.21.7 |
| kube-proxy | 1.20.13 | 1.21.7 |
| kubelet | 1.20.13 | 1.21.7 |
| calico | 3.15.3 | 3.21.1 |
| coredns | 1.7.0 | 1.8.6 |
升级Master
Master01
# 备份
[root@k8s-master01 ~]# cd /usr/local/bin/
[root@k8s-master01 bin]# cp kube-apiserver kube-controller-manager kube-scheduler kubectl /tmp
# 下载安装包
[root@k8s-master01 ~]# wget https://storage.googleapis.com/kubernetes-release/release/v1.21.7/kubernetes-server-linux-amd64.tar.gz
[root@k8s-master01 ~]# tar zxf kubernetes-server-linux-amd64.tar.gz
# 停止服务
[root@k8s-master01 ~]# systemctl stop kube-apiserver
[root@k8s-master01 ~]# systemctl stop kube-controller-manager
[root@k8s-master01 ~]# systemctl stop kube-scheduler
# 更新包
[root@k8s-master01 bin]# cd /root/kubernetes/server/bin/
[root@k8s-master01 bin]# ll
total 1075472
-rwxr-xr-x 1 root root 50810880 Nov 17 22:52 apiextensions-apiserver
-rwxr-xr-x 1 root root 44867584 Nov 17 22:52 kubeadm
-rwxr-xr-x 1 root root 48586752 Nov 17 22:52 kube-aggregator
-rwxr-xr-x 1 root root 122204160 Nov 17 22:52 kube-apiserver
-rw-r--r-- 1 root root 8 Nov 17 22:50 kube-apiserver.docker_tag
-rw------- 1 root root 126985216 Nov 17 22:50 kube-apiserver.tar
-rwxr-xr-x 1 root root 116404224 Nov 17 22:52 kube-controller-manager
-rw-r--r-- 1 root root 8 Nov 17 22:50 kube-controller-manager.docker_tag
-rw------- 1 root root 121185280 Nov 17 22:50 kube-controller-manager.tar
-rwxr-xr-x 1 root root 46669824 Nov 17 22:52 kubectl
-rwxr-xr-x 1 root root 55317704 Nov 17 22:52 kubectl-convert
-rwxr-xr-x 1 root root 118390192 Nov 17 22:52 kubelet
-rwxr-xr-x 1 root root 43376640 Nov 17 22:52 kube-proxy
-rw-r--r-- 1 root root 8 Nov 17 22:50 kube-proxy.docker_tag
-rw------- 1 root root 105378304 Nov 17 22:50 kube-proxy.tar
-rwxr-xr-x 1 root root 47349760 Nov 17 22:52 kube-scheduler
-rw-r--r-- 1 root root 8 Nov 17 22:50 kube-scheduler.docker_tag
-rw------- 1 root root 52130816 Nov 17 22:50 kube-scheduler.tar
-rwxr-xr-x 1 root root 1593344 Nov 17 22:52 mounter
[root@k8s-master01 bin]# cp kube-api