11.9. 删除 IP 故障切换

流程

1. 可选：识别并删除存储为配置映射的任何检查和通知脚本：

   1. 确定任何用于 IP 故障切换的 pod 是否使用配置映射作为卷：

      $ oc get pod -l ipfailover \
        -o jsonpath="\
      {range .items[?(@.spec.volumes[*].configMap)]}
      {'Namespace: '}{.metadata.namespace}
      {'Pod:       '}{.metadata.name}
      {'Volumes that use config maps:'}
      {range .spec.volumes[?(@.configMap)]}  {'volume:    '}{.name}
        {'configMap: '}{.configMap.name}{'\n'}{end}
      {end}"

      输出示例

      Namespace: default
      Pod:       keepalived-worker-59df45db9c-2x9mn
      Volumes that use config maps:
        volume:    config-volume
        configMap: mycustomcheck

   2. 如果上一步提供了用作卷的配置映射的名称，请删除配置映射：

      $ oc delete configmap <configmap_name>

2. 为 IP 故障切换识别现有部署：

   $ oc get deployment -l ipfailover

   输出示例

   NAMESPACE   NAME         READY   UP-TO-DATE   AVAILABLE   AGE
   default     ipfailover   2/2     2            2           105d

3. 删除部署：

   $ oc delete deployment <ipfailover_deployment_name>

4. 删除 ipfailover 服务帐户：

   $ oc delete sa ipfailover

5. 运行一个作业，该作业会删除最初配置 IP 故障切换时添加的 IP 表规则：

   1. 创建一个文件，如 remove-ipfailover-job.yaml，其内容类似以下示例：

      apiVersion: batch/v1
      kind: Job
      metadata:
        generateName: remove-ipfailover-
        labels:
          app: remove-ipfailover
      spec:
        template:
          metadata:
            name: remove-ipfailover
          spec:
            containers:
            - name: remove-ipfailover
              image: quay.io/openshift/origin-keepalived-ipfailover:4.10
              command: ["/var/lib/ipfailover/keepalived/remove-failover.sh"]
            nodeSelector:
              kubernetes.io/hostname: <host_name>  <.>
            restartPolicy: Never

      <.> 为集群中配置 IP 故障切换的每个节点运行作业，并每次替换主机名。

   2. 运行作业：

      $ oc create -f remove-ipfailover-job.yaml

      输出示例

      job.batch/remove-ipfailover-2h8dm created