k8s-v1.15升级v1.16-已解决

kubernetes版本的升级主要是升级kubeadm、kubectl和kubelet，升级应遵循以下原则：

1、apiserver保护版本最大，其它功能最多比apiserver小一个小版本号。

2、不能跨小版本升级。

0、使用下列命令列出可用版本

yum list --showduplicates kubeadm --disableexcludes=kubernetes

操作系统CentOS7，这次升级从 1.15.0 升级到 1.16.0。

1、升级kubeadm

yum install -y kubeadm-1.16.0-0 --disableexcludes=kubernetes

kubectl drain k8s-master --ignore-daemonsets --force

kubeadm upgrade plan

kubeadm upgrade apply v1.16.0

kubectl uncordon k8s-master

yum install -y kubelet-1.16.0-0 kubectl-1.16.0-0 --disableexcludes=kubernetes

systemctl daemon-reload

systemctl restart kubelet

2、k8s-master升级后看到k8s-master处于NotReady状态，查看日志:journalctl -f -u kubelet，服务一直提示cni网络组件有问题

[root@k8s-master CNI]# kubectl get nodes

NAME        STATUS    ROLES    AGE    VERSION

k8s-master  NotReady  master  385d  v1.16.0

k8s-node1    Ready      node    385d  v1.15.0

k8s-node2    Ready      node    20h    v1.15.0

journalctl -f -u kubelet

3、删除原有flannel重新创建下试试：

[root@k8s-master CNI]# kubectl delete -f https://raw.githubusercontent.com/coreos/flannel/a70459be0084506e4ec919aa1c114638878db11b/Documentation/kube-flannel.yml

##删除可能会报错：

kubectl get DaemonSet -n kube-system

##删除里面的关于flannel的DaemonSet：

kubectl delete XXX -n kube-system

[root@k8s-master CNI]# kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/a70459be0084506e4ec919aa1c114638878db11b/Documentation/kube-flannel.yml

clusterrole.rbac.authorization.k8s.io/flannel created

clusterrolebinding.rbac.authorization.k8s.io/flannel created

serviceaccount/flannel created

configmap/kube-flannel-cfg created

unable to recognize "kube-flannel.yml": no matches for kind "DaemonSet" in version "extensions/v1beta1"

unable to recognize "kube-flannel.yml": no matches for kind "DaemonSet" in version "extensions/v1beta1"

unable to recognize "kube-flannel.yml": no matches for kind "DaemonSet" in version "extensions/v1beta1"

unable to recognize "kube-flannel.yml": no matches for kind "DaemonSet" in version "extensions/v1beta1"

unable to recognize "kube-flannel.yml": no matches for kind "DaemonSet" in version "extensions/v1beta1"

4、换个flannel链接试试：

[root@k8s-master CNI]# kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

podsecuritypolicy.policy/psp.flannel.unprivileged created

clusterrole.rbac.authorization.k8s.io/flannel configured

clusterrolebinding.rbac.authorization.k8s.io/flannel unchanged

serviceaccount/flannel unchanged

configmap/kube-flannel-cfg unchanged

daemonset.apps/kube-flannel-ds-amd64 created

daemonset.apps/kube-flannel-ds-arm64 created

daemonset.apps/kube-flannel-ds-arm created

daemonset.apps/kube-flannel-ds-ppc64le created

daemonset.apps/kube-flannel-ds-s390x created

5、我们查看k8s-master已经变成Ready状态

[root@k8s-master CNI]# kubectl get nodes

NAME        STATUS  ROLES    AGE    VERSION

k8s-master  Ready    master  385d  v1.16.0

k8s-node1    Ready    node    385d  v1.15.0

k8s-node2    Ready    node    20h    v1.15.0

6、升级业务节点（同样适用于剩余的其它控制节点）

yum install -y kubeadm-1.16.0-0 --disableexcludes=kubernetes

#在master节点执行

kubectl drain k8s-node-a --ignore-daemonsets --force

kubeadm upgrade node

yum install -y kubelet-1.16.0-0 kubectl-1.16.0-0 --disableexcludes=kubernetes

systemctl daemon-reload

systemctl restart kubelet

#在master节点执行

kubectl uncordon k8s-node-a