kubernetes 1.15安装部署helm插件
简单介绍：
Helm其实就是一个基于Kubernetes的程序包（资源包）管理器，它将一个应用的相关资源组织成为Charts，并通过Charts管理程序包。再简单点说，可以当做RHEL/CentOS系统中的yum机制，有yum install，也有helm install等等。具体可以参考网上其他介绍。
GitHub：https://github.com/helm/helm
官网：https://helm.sh/docs/using_helm/#quickstart-guide
测试环境：
同之前部署的集群环境，如下
| System | Hostname | IP | Helm |
| CentOS 7.5 | k8s-master | 192.168.71.133 | helm命令安装在主节点上 |
| CentOS 7.5 | k8s-node1 | 192.168.71.134 | |
| CentOS 7.5 | k8s-node2 | 192.168.71.135 |
具体步骤：
1. 安装客户端Helm命令（https://github.com/helm/helm/releases）
[root@k8s-master ~]# wget https://storage.googleapis.com/kubernetes-helm/helm-v2.14.1-linux-amd64.tar.gz
解压，将其中的helm文件移至 /usr/local/bin/
[root@k8s-master ~]# mv linux-amd64/helm /usr/local/bin/
helm的命令安装完成，如需查看命令怎么使用，使用 ~]# helm help 即可。
2. 安装Tiller服务
Tiller是helm的服务器端，一般运行于kubernetes集群之上，当然少不了RBAC授权，事先创建相关的ServiceAccount才能进行安装。
下面给出了一个样例yaml清单，定义了一个名为tiller的ServiceAccount，并通过ClusterRoleBinding将其绑定至集群管理员角色cluster-admin，从而使得它拥有集群级别所有的最高权限：
[root@k8s-master ~]# cat till-rbac-config.yaml apiVersion: v1 kind: ServiceAccount metadata: name: tiller namespace: kube-system --- apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRoleBinding metadata: name: tiller roleRef: apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: cluster-admin subjects: - kind: ServiceAccount name: tiller namespace: kube-system
发布到kubernetes集群中去：
[root@k8s-master ~]# kubectl apply -f till-rbac-config.yaml serviceaccount/tiller created clusterrolebinding.rbac.authorization.k8s.io/tiller created
接下来，初始化Tiller服务：
[root@k8s-master ~]# helm init --upgrade --service-account tiller --tiller-image registry.cn-hangzhou.aliyuncs.com/google_containers/tiller:v2.14.1 --stable-repo-url https://kubernetes.oss-cn-hangzhou.aliyuncs.com/charts
Creating /root/.helm Creating /root/.helm/repository Creating /root/.helm/repository/cache Creating /root/.helm/repository/local Creating /root/.helm/plugins Creating /root/.helm/starters Creating /root/.helm/cache/archive Creating /root/.helm/repository/repositories.yaml Adding stable repo with URL: https://kubernetes.oss-cn-hangzhou.aliyuncs.com/charts Adding local repo with URL: http://127.0.0.1:8879/charts $HELM_HOME has been configured at /root/.helm. Tiller (the Helm server-side component) has been installed into your Kubernetes Cluster. Please note: by default, Tiller is deployed with an insecure 'allow unauthenticated users' policy. To prevent this, run `helm init` with the --tiller-tls-verify flag. For more information on securing your installation see: https://docs.helm.sh/using_helm/#securing-your-helm-installation Happy Helming!
如上显示，初始化成功！
注意：helm init命令进行初始化时，Kubernetes集群会到gcr.io/kubernetes-helm/上获取所需的镜像，不出意外，被墙了，故指定替代镜像可以解决。同时还要将repo源更换成阿里的镜像，更快更便捷。
3. helm命令使用
①更新使用的默认仓库元数据信息
[root@k8s-master ~]# helm repo update Hang tight while we grab the latest from your chart repositories... ...Skip local chart repository ...Successfully got an update from the "stable" chart repository Update Complete. ⎈ Happy Helming!⎈
②搜索列出
[root@k8s-master ~]# helm search redis NAME CHART VERSION APP VERSION DESCRIPTION stable/redis 1.1.15 4.0.8 Open source, advanced key-value store. It is often referr... stable/redis-ha 2.0.1 Highly available Redis cluster with multiple sentinels an... stable/sensu 0.2.0 Sensu monitoring framework backed by the Redis transport
③打印指定Charts详细信息
[root@k8s-master ~]# helm inspect stable/redis
④安装
[root@k8s-master ~]# helm install stable/redis -n redis // -n 给个名字；也可以在安装前加个 --dry-run 用作测试
⑤查看已经安装
[root@k8s-master ~]# helm list
⑥删除已经安装的
[root@k8s-master ~]# helm delete redis
⑦其他
[root@k8s-master ~]# helm upgrade
[root@k8s-master ~]# helm rollback [root@k8s-master ~]# helm history
至此，Helm的安装和简单使用到此完成。