解决k8s helm安装tiller出现ImagePullBackOff，ErrImagePull错误_tiller is already installed in the cluster

使用helm安装tiller

helm init --service-account=tiller --tiller-image=gcr.io/kubernetes-helm/tiller:v2.17.0
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返回

$HELM_HOME has been configured at /root/.helm.
Warning: Tiller is already installed in the cluster.
(Use --client-only to suppress this message, or --upgrade to upgrade Tiller to the current version.)
[root@k8s-master helm]# helm version
Client: &version.Version{SemVer:"v2.17.0", GitCommit:"a690bad98af45b015bd3da1a41f6218b1a451dbe", GitTreeState:"clean"}
Error: could not find a ready tiller pod

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查看pod状态

kubectl get pods -n kube-system
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结果 tiller-deploy-7555cf9759-sv8rj 出现 ErrImagePull：

coredns-6d56c8448f-k224x             1/1     Running        1          12d
etcd-k8s-master                      1/1     Running        10         12d
kube-apiserver-k8s-master            1/1     Running        23         12d
kube-controller-manager-k8s-master   1/1     Running        134        12d
kube-flannel-ds-gmj98                1/1     Running        0          5d
kube-flannel-ds-jpn79                1/1     Running        1          5d22h
kube-flannel-ds-zfjbv                1/1     Running        0          5d
kube-proxy-bld8q                     1/1     Running        0          5d
kube-proxy-gpn26                     1/1     Running        0          5d
kube-proxy-zh9t5                     1/1     Running        4          12d
kube-scheduler-k8s-master            1/1     Running        134        12d
tiller-deploy-7555cf9759-sv8rj       0/1     ErrImagePull   0          25s

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查看tiller-deploy-7555cf9759-sv8rj pod日志信息

kubectl describe pod tiller-deploy-7555cf9759-sv8rj -n kube-system
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出现pull image error提示ErrImagePull

Events:
  Type     Reason     Age                    From               Message
  ----     ------     ----                   ----               -------
  Normal   BackOff    3d15h (x2 over 3d15h)  kubelet            Back-off pulling image "gcr.io/kubernetes-helm/tiller:v2.17.0"
  Warning  Failed     3d15h (x2 over 3d15h)  kubelet            Error: ImagePullBackOff
  Normal   Pulling    3d15h (x3 over 3d15h)  kubelet            Pulling image "gcr.io/kubernetes-helm/tiller:v2.17.0"
  Warning  Failed     3d15h (x3 over 3d15h)  kubelet            Failed to pull image "gcr.io/kubernetes-helm/tiller:v2.17.0": rpc error: code = Unknown desc = Error response from daemon: Get https://gcr.io/v2/: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)
  Warning  Failed     3d15h (x3 over 3d15h)  kubelet            Error: ErrImagePull
  Normal   Scheduled  96s                    default-scheduler  Successfully assigned kube-system/tiller-deploy-7555cf9759-sv8rj to k8s-node1
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分析：gcr.io/kubernetes-helm/tiller:v2.17.0拉取镜像失败。

解决方法：

删除tiller deployment，顺带会一起删除tiller pod

kubectl delete -n kube-system deployment tiller-deploy
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或者

helm reset -f
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重新镜像安装

helm init --service-account=tiller --tiller-image=registry.cn-hangzhou.aliyuncs.com/google_containers/tiller:v2.17.0   --history-max 300
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再次查看tiller pod状态

kubectl get pods  -n kube-system
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出现Running说明tiller安装成功

kube-controller-manager-k8s-master   1/1     Running   134        12d
kube-flannel-ds-gmj98                1/1     Running   0          5d1h
kube-flannel-ds-jpn79                1/1     Running   1          5d23h
kube-flannel-ds-zfjbv                1/1     Running   0          5d1h
kube-proxy-bld8q                     1/1     Running   0          5d1h
kube-proxy-gpn26                     1/1     Running   0          5d1h
kube-proxy-zh9t5                     1/1     Running   4          12d
kube-scheduler-k8s-master            1/1     Running   134        12d
tiller-deploy-7d7cc8d4db-8jhww       1/1     Running   0          21s

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查看helm版本

helm version
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出现以下安装

Client: &version.Version{SemVer:"v2.17.0", GitCommit:"a690bad98af45b015bd3da1a41f6218b1a451dbe", GitTreeState:"clean"}
Server: &version.Version{SemVer:"v2.17.0", GitCommit:"a690bad98af45b015bd3da1a41f6218b1a451dbe", GitTreeState:"clean"}

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参考链接：

https://juejin.cn/post/6844904087234805767
https://www.jianshu.com/p/d0cdbb49569b