5.4. 基于 Ansible 的 Operator

流程

1. 创建一个项目。

   1. 创建您的项目目录：

      $ mkdir memcached-operator

   2. 切换到项目所在的目录：

      $ cd memcached-operator

   3. 使用 ansible 插件运行 operator-sdk init 命令以初始化项目：

      $ operator-sdk init \
          --plugins=ansible \
          --domain=example.com

2. 创建 API。

   创建简单的 Memcached API：

   $ operator-sdk create api \
       --group cache \
       --version v1 \
       --kind Memcached \
       --generate-role 1

   1

   为 API 生成 Ansible 角色。

3. 构建并推送 Operator 镜像。

   使用默认的 Makefile 目标来构建和推送 Operator。使用镜像的 pull spec 设置 IMG，该 spec 使用您可推送到的 registry：

   $ make docker-build docker-push IMG=<registry>/<user>/<image_name>:<tag>

4. 运行 Operator。

   1. 安装 CRD：

      $ make install

   2. 将项目部署到集群中。将 IMG 设置为您推送的镜像：

      $ make deploy IMG=<registry>/<user>/<image_name>:<tag>

5. 创建示例自定义资源（CR）。

   1. 创建一个示例 CR：

      $ oc apply -f config/samples/cache_v1_memcached.yaml \
          -n memcached-operator-system

   2. 查看 CR 协调 Operator：

      $ oc logs deployment.apps/memcached-operator-controller-manager \
          -c manager \
          -n memcached-operator-system

      输出示例

      ...
      I0205 17:48:45.881666       7 leaderelection.go:253] successfully acquired lease memcached-operator-system/memcached-operator
      {"level":"info","ts":1612547325.8819902,"logger":"controller-runtime.manager.controller.memcached-controller","msg":"Starting EventSource","source":"kind source: cache.example.com/v1, Kind=Memcached"}
      {"level":"info","ts":1612547325.98242,"logger":"controller-runtime.manager.controller.memcached-controller","msg":"Starting Controller"}
      {"level":"info","ts":1612547325.9824686,"logger":"controller-runtime.manager.controller.memcached-controller","msg":"Starting workers","worker count":4}
      {"level":"info","ts":1612547348.8311093,"logger":"runner","msg":"Ansible-runner exited successfully","job":"4037200794235010051","name":"memcached-sample","namespace":"memcached-operator-system"}

6. 清理。

   运行以下命令清理在此流程中创建的资源：

   $ make undeploy