使用kubeadm升级K8S

使用kubeadm升级K8S

时间：2019年3月6日16:50:10

注意：

如下示例为1.11.2升级到1.11.7

同样适用于1.11.x升级到1.12.x这种次级版本升级

不支持1.11到1.13这种跨次版本升级方式

• 环境说明：

  1.操作系统：Ubuntu 18.04 LTS
  2.K8S部署： Static Pod方式部署controll plane

一、使用kubeadm upgrade plan查看当前可升级情况

[root@zxg kubernetes_ubuntu]# kubeadm upgrade plan
[preflight] Running pre-flight checks.
[upgrade] Making sure the cluster is healthy:
[upgrade/config] Making sure the configuration is correct:
[upgrade/config] Reading configuration from the cluster...
[upgrade/config] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -oyaml'
[upgrade] Fetching available versions to upgrade to
[upgrade/versions] Cluster version: v1.11.2
[upgrade/versions] kubeadm version: v1.11.2

[upgrade/versions] Latest stable version: v1.13.3
[upgrade/versions] Latest version in the v1.11 series: v1.11.7
[upgrade/versions] WARNING: No recommended etcd for requested kubernetes version (v1.13.3)

Components that must be upgraded manually after you have upgraded the control plane with 'kubeadm upgrade apply':
COMPONENT   CURRENT       AVAILABLE
Kubelet     1 x v1.11.2   v1.11.7

Upgrade to the latest version in the v1.11 series:

COMPONENT            CURRENT   AVAILABLE
API Server           v1.11.2   v1.11.7
Controller Manager   v1.11.2   v1.11.7
Scheduler            v1.11.2   v1.11.7
Kube Proxy           v1.11.2   v1.11.7
CoreDNS              1.1.3     1.1.3
Etcd                 3.2.18    3.2.18

You can now apply the upgrade by executing the following command:

	kubeadm upgrade apply v1.11.7

Note: Before you can perform this upgrade, you have to update kubeadm to v1.11.7.

_____________________________________________________________________

Components that must be upgraded manually after you have upgraded the control plane with 'kubeadm upgrade apply':
COMPONENT   CURRENT       AVAILABLE
Kubelet     1 x v1.11.2   v1.13.3

Upgrade to the latest stable version:

COMPONENT            CURRENT   AVAILABLE
API Server           v1.11.2   v1.13.3
Controller Manager   v1.11.2   v1.13.3
Scheduler            v1.11.2   v1.13.3
Kube Proxy           v1.11.2   v1.13.3
CoreDNS              1.1.3     1.1.3
Etcd                 3.2.18    N/A

You can now apply the upgrade by executing the following command:

	kubeadm upgrade apply v1.13.3

Note: Before you can perform this upgrade, you have to update kubeadm to v1.13.3.

_____________________________________________________________________

二、根据以上提示，先升级kubeadm/kubelet/kubectl

1.下载kubeadm/kubelet/kubectl安装包 [ 需要在可联网机器上下载 ]

# apt download kubeadm=1.11.7-00 kubectl=1.11.7-00 kubelet=1.11.7-00
# ls
kubeadm_1.11.7-00_amd64.deb  kubectl_1.11.7-00_amd64.deb  kubelet_1.11.7-00_amd64.deb

2.升级 kubeadm/kubelet/kubectl到1.11.7版本

# ls
kubeadm_1.11.7-00_amd64.deb  kubectl_1.11.7-00_amd64.deb  kubelet_1.11.7-00_amd64.deb
# dpkg -i *.deb

注：以上两步可合并成：apt install kubeadm=1.11.7-00 kubectl=1.11.7-00 kubelet=1.11.7-00

三、下载升级到执行版本需要的镜像

从1.11.2升级到 1.11.7需要的新镜像：

- kube-apiserver
- kube-controller-manager
- kube-scheduler
- kube-proxy

下载并推送到镜像仓库：

# PULL [需要联网]
docker pull mirrorgooglecontainers/kube-apiserver:v1.11.7
docker pull mirrorgooglecontainers/kube-controller-manager:v1.11.7
docker pull mirrorgooglecontainers/kube-scheduler:v1.11.7
docker pull mirrorgooglecontainers/kube-proxy:v1.11.7

# TAG
docker tag mirrorgooglecontainers/kube-controller-manager:v1.11.7 myharbor.io/google_containers/kube-controller-manager:v1.11.7
docker tag mirrorgooglecontainers/kube-apiserver:v1.11.7          myharbor.io/google_containers/kube-apiserver:v1.11.7
docker tag mirrorgooglecontainers/kube-scheduler:v1.11.7          myharbor.io/google_containers/kube-scheduler:v1.11.7                                                                                                  
docker tag mirrorgooglecontainers/kube-proxy:v1.11.7              myharbor.io/google_containers/kube-proxy:v1.11.7

# PUSH
docker push myharbor.io/google_containers/kube-controller-manager:v1.11.7
docker push myharbor.io/google_containers/kube-apiserver:v1.11.7
docker push myharbor.io/google_containers/kube-scheduler:v1.11.7
docker push myharbor.io/google_containers/kube-proxy:v1.11.7

四、准备升级配置文件: kubeadm.yaml

kubeadm.yaml文件内容如下：

	apiVersion: kubeadm.k8s.io/v1alpha2
	kind: MasterConfiguration
	api:
	  advertiseAddress: 0.0.0.0
	kubernetesVersion: v1.11.7
	imageRepository: myharbor.io/google_containers
	networking:
	  podSubnet: 10.244.0.0/16
	nodeRegistration:
	  criSocket: /var/run/containerd/containerd.sock
	kubeProxy:
	  conf