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helm部署etcd集群

2022-07-06 10:52:00 开发运维玄德公

1. chart和镜像准备

1.1 官方下载chart

1.2 下载

找一台可以上公网的服务器,参照官方文下载chart包

  • 添加helm仓库
# helm repo add bitnami-aks https://marketplace.azurecr.io/helm/v1/repo
  • 选择适合版本
# helm pull bitnami-aks/etcd --version 6.2.9

可见chart包已经下载到当前目录

# ll
-rw-r--r-- 1 root root 34334 719 14:34 etcd-6.2.10.tgzgz

将chart拷贝到要目标服务器上即可。

1.3 下载镜像

1.3.1 下载镜像

离线安装需要提前准备如下镜像:

  • etcd镜像(必要)
    docker.io/bitnami/etcd:3.4.15-debian-10-r33
  • 许可证相关(非必要)
    下边这个镜像是写许可证用的,如果没有启用许可证可以不下载
    docker.io/bitnami/bitnami-shell:10-debian-10-r134

1.3.2 上传私有镜像仓库

私有镜像镜像名如下:
harbocto.xxx.com.cn/bitnami/etcd:3.4.15-debian-10-r33
harbocto.xxx.com.cn/bitnami/bitnami-shell:10-debian-10-r134

2. 修改配置文件

进入解压缩后生成的etcd目录

  • 修改镜像(离线安装必要)
    修改成本地镜像
image:
  registry: harbocto.xxx.com.cn
  repository: bitnami/etcd
  tag: 3.5.0-debian-10-r24

下边许可证没有启用,所以其实不修改也可以

volumePermissions:
  enabled: false
  image:
    registry: harbocto.xxx.com.cn
    repository: bitnami/bitnami-shell
    tag: 10-debian-10-r134
    pullPolicy: Always
  • 修改密码(非必要)
auth:
  rbac:
    ……
    rootPassword: "Boe888888"
  • 修改副本数(必要)
replicaCount: 3
  • 持久化存储大小(非必要)

默认开启了持久化存储:persistence.enabled=true
所以我们只需要改pvc的大小即可

persistence:
  ......
  size: 50Gi
  • 修改为 NodePort(非必要)

我实际并没有打开,所以后边的service可以看到我依然使用的ClusterIP

注释ClusterIP后添加如下内容:

service:
  type: NodePort
  #type: ClusterIP
 ......
  nodePorts:
    clientPort: "31015"
    peerPort: "31016"

3 启动服务

  • 创建namespace,进入chart的etcd目录启动服务
[[email protected] etcd]# kubectl create namespace etcd
[[email protected] etcd]# helm install etcd -n etcd ./
  • 查看pod
[[email protected] etcd]# kubectl get pod -n etcd
NAME     READY   STATUS    RESTARTS   AGE
etcd-0   1/1     Running   0          25m
etcd-1   1/1     Running   0          25m
etcd-2   1/1     Running   0          25m
  • 查看service
[[email protected] etcd]# kubectl get service -n etcd
NAME            TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)             AGE
etcd            ClusterIP   10.1.231.186   <none>        2379/TCP,2380/TCP   25m
etcd-headless   ClusterIP   None           <none>        2379/TCP,2380/TCP   25m

4. 测试

  • 输出
    刚才创建的时候可见数据如下:
[[email protected] etcd]# helm install etcd -n etcd ./
NAME: etcd
LAST DEPLOYED: Mon Jul 19 15:56:47 2021
NAMESPACE: etcd
STATUS: deployed
REVISION: 1
TEST SUITE: None
NOTES:
** Please be patient while the chart is being deployed **

etcd can be accessed via port 2379 on the following DNS name from within your cluster:

    etcd.etcd.svc.cluster.local

To create a pod that you can use as a etcd client run the following command:

    kubectl run etcd-client --restart='Never' --image harbocto.boe.com.cn/bitnami/etcd:3.5.0-debian-10-r24 --env ROOT_PASSWORD=$(kubectl get secret --namespace etcd etcd -o jsonpath="{.data.etcd-root-password}" | base64 --decode) --env ETCDCTL_ENDPOINTS="etcd.etcd.svc.cluster.local:2379" --namespace etcd --command -- sleep infinity

Then, you can set/get a key using the commands below:

    kubectl exec -it etcd-client -- bash
    etcdctl --user root:$ROOT_PASSWORD put /message Hello
    etcdctl --user root:$ROOT_PASSWORD get /message

To connect to your etcd server from outside the cluster execute the following commands:

    kubectl port-forward --namespace etcd svc/etcd 2379:2379 &
    echo "etcd URL: http://127.0.0.1:2379"

 * As rbac is enabled you should add the flag `--user root:$ETCD_ROOT_PASSWORD` to the etcdctl commands. Use the command below to export the password:

    export ETCD_ROOT_PASSWORD=$(kubectl get secret --namespace etcd etcd -o jsonpath="{.data.etcd-root-password}" | base64 --decode)
  • 进入etcd的pod
[[email protected] etcd]# kubectl exec -it -n etcd etcd-0 bash
  • 写入数据
I have no [email protected]:/opt/bitnami/etcd$ etcdctl --user root:Bxx888888  put /message Hello
OK
  • 读刚才写入的数据
I have no [email protected]:/opt/bitnami/etcd$ etcdctl --user root:Bxx888888 get /message
/message
Hello

FAQ

1)helm3.0.3报错

helm 3.0.3 报错如下:

[[email protected] etcd]# helm version
version.BuildInfo{
    Version:"v3.0.3", GitCommit:"ac925eb7279f4a6955df663a0128044a8a6b7593", GitTreeState:"clean", GoVersion:"go1.13.6"}
[[email protected] etcd]# helm install etcd -n etcd-ha ./
Error: parse error at (etcd/charts/common/templates/_secrets.tpl:84): function "lookup" not defined

【解决】
我是直接升级到3.5.4 解决了


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版权声明
本文为[开发运维玄德公]所创,转载请带上原文链接,感谢
https://blog.csdn.net/xingzuo_1840/article/details/121730508