升级
先从负载均衡服务器上面禁用，防止调度到正在做升级相应服务器上 (记得，升级完后要把注释去掉，重新加载haproxy)
[root@haproxy ~]# cat /etc/haproxy/haproxy.cfg
listen k8s-m44-6443
bind 172.18.8.168:6443
mode tcp
#server 172.18.8.109 172.18.8.109:6443 check inter 2s fall 3 rise 5
server 172.18.8.119 172.18.8.119:6443 check inter 2s fall 3 rise 5
server 172.18.8.129 172.18.8.129:6443 check inter 2s fall 3 rise 5
重新加载haproxy
[root@haproxy ~]# systemctl reload haproxy.service
先安装指定版本（每个master都执行）
[root@k8s-server1 ~]# apt-cache madison kubeadm
[root@k8s-server1 ~]# apt install kubeadm=1.20.9-00 kubelet=1.20.9-00 kubectl=1.20.9-00
...
[y/n] y
查看升级计划
[root@k8s-server1 manifests]# kubeadm upgrade plan
[upgrade/con@R_404_6408@] Making sure the con@R_404_6408@uration is correct:
[upgrade/con@R_404_6408@] Reading con@R_404_6408@uration from the cluster...
[upgrade/con@R_404_6408@] FYI: You can look at this con@R_404_6408@ file with 'kubectl -n kube-system get cm kubeadm-con@R_404_6408@ -o yaml'
[preflight] Running pre-flight checks.
[upgrade] Running cluster health checks
[upgrade] Fetching available versions to upgrade to
[upgrade/versions] Cluster version: v1.20.5
[upgrade/versions] kubeadm version: v1.20.9
I0727 07:39:27.335261 26453 version.go:254] remote version is much newer: v1.21.3; falling back to: stable-1.20
[upgrade/versions] Latest stable version: v1.20.9
[upgrade/versions] Latest stable version: v1.20.9
[upgrade/versions] Latest version in the v1.20 series: v1.20.9
[upgrade/versions] Latest version in the v1.20 series: v1.20.9
Components that must be upgraded manually after you have upgraded the control plane with 'kubeadm upgrade apply':
COMPONENT CURRENT AVAILABLE
kubelet 6 x v1.20.5 v1.20.9
Upgrade to the latest version in the v1.20 series:
COMPONENT CURRENT AVAILABLE
kube-apiserver v1.20.5 v1.20.9
kube-controller-manager v1.20.5 v1.20.9
kube-scheduler v1.20.5 v1.20.9
kube-proxy v1.20.5 v1.20.9
coredns 1.7.0 1.7.0
etcd 3.4.13-0 3.4.13-0
You can Now apply the upgrade by executing the following command:
kubeadm upgrade apply v1.20.9
_____________________________________________________________________
The table below shows the current state of component con@R_404_6408@s as understood by this version of kubeadm.
Con@R_404_6408@s that have a "yes" mark in the "MANUAL UPGRADE required" column require manual con@R_404_6408@ upgrade or
resetting to kubeadm defaults before a successful upgrade can be performed. The version to manually
upgrade to is denoted in the "PREFERRED VERSION" column.
API GROUP CURRENT VERSION PREFERRED VERSION MANUAL UPGRADE required
kubeproxy.con@R_404[email protected] v1alpha1 v1alpha1 no
kubelet.con@R_404[email protected] v1beta1 v1beta1 no
_____________________________________________________________________
执行（每个master）
[root@k8s-server1 ~]# kubeadm upgrade apply v1.20.9
[y/n] y
...
[upgrade/successful] SUCCESS! Your cluster was upgraded to "v1.20.9". Enjoy!
node节点执行（每个node节点）
[root@k8s-node1 ~]# apt install kubeadm=1.20.9-00 kubelet=1.20.9-00
...
[y/n] y
查看版本是否有变化
[root@k8s-server1 ~]# kubectl get node
NAME STATUS ROLES AGE VERSION
k8s-node1 Ready <none> 2d3h v1.20.9
k8s-node2 Ready <none> 2d3h v1.20.9
k8s-node3 Ready <none> 43h v1.20.9
k8s-server1 Ready control-plane,master 2d4h v1.20.9
k8s-server2 Ready control-plane,master 2d3h v1.20.9
k8s-server3 Ready control-plane,master 2d2h v1.20.9
降级
先下载比上个版本低的版本号
[root@k8s-server1 ~]# apt install kubeadm=1.20.5-00 kubelet=1.20.5-00 kubectl=1.20.5-00
...
[y/n] y
查看计划
[root@k8s-server1 ~]# kubeadm upgrade plan
执行
[root@k8s-server1 ~]# kubeadm upgrade apply v1.20.5
...
[y/n] y
...
[upgrade/successful] SUCCESS! Your cluster was upgraded to "v1.20.5". Enjoy!
node节点执行
[root@k8s-node1 ~]# apt install kubeadm=1.20.5-00 kubelet=1.20.5-00
...
[y/n] y
查看
[root@k8s-server1 ~]# kubectl get node
NAME STATUS ROLES AGE VERSION
k8s-node1 Ready <none> 2d3h v1.20.5
k8s-node2 Ready <none> 2d3h v1.20.5
k8s-node3 Ready <none> 43h v1.20.5
k8s-server1 Ready control-plane,master 2d4h v1.20.5
k8s-server2 Ready control-plane,master 2d3h v1.20.5
k8s-server3 Ready control-plane,master 2d3h v1.20.5
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