16.7. 使用容器镜像预缓存功能

流程

1. 在 clustergroupupgrades-group-du.yaml 文件中将 preCaching 字段设置为 true 来保存 ClusterGroupUpgrade CR 的内容：

   apiVersion: ran.openshift.io/v1alpha1
   kind: ClusterGroupUpgrade
   metadata:
     name: du-upgrade-4918
     namespace: ztp-group-du-sno
   spec:
     preCaching: true 

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     clusters:
     - cnfdb1
     - cnfdb2
     enable: false
     managedPolicies:
     - du-upgrade-platform-upgrade
     remediationStrategy:
       maxConcurrency: 2
       timeout: 240

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   preCaching 字段设为 true，它允许 TALM 在开始更新前拉取容器镜像。

2. 当您要启动更新时，通过运行以下命令应用 ClusterGroupUpgrade CR：

   $ oc apply -f clustergroupupgrades-group-du.yaml

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验证

1. 运行以下命令，检查 hub 集群中是否存在 ClusterGroupUpgrade CR：

   $ oc get cgu -A

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   输出示例

   NAMESPACE          NAME              AGE
   ztp-group-du-sno   du-upgrade-4918   10s 

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   CR 被创建。

2. 运行以下命令，检查预缓存任务的状态：

   $ oc get cgu -n ztp-group-du-sno du-upgrade-4918 -o jsonpath='{.status}'

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   输出示例

   {
     "conditions": [
       {
         "lastTransitionTime": "2022-01-27T19:07:24Z",
         "message": "Precaching is not completed (required)", 

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         "reason": "PrecachingRequired",
         "status": "False",
         "type": "Ready"
       },
       {
         "lastTransitionTime": "2022-01-27T19:07:24Z",
         "message": "Precaching is required and not done",
         "reason": "PrecachingNotDone",
         "status": "False",
         "type": "PrecachingDone"
       },
       {
         "lastTransitionTime": "2022-01-27T19:07:34Z",
         "message": "Pre-caching spec is valid and consistent",
         "reason": "PrecacheSpecIsWellFormed",
         "status": "True",
         "type": "PrecacheSpecValid"
       }
     ],
     "precaching": {
       "clusters": [
         "cnfdb1" 

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       ],
       "spec": {
         "platformImage": "image.example.io"},
       "status": {
         "cnfdb1": "Active"}
       }
   }

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   显示更新正在进行中。

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   显示已识别的集群列表。

3. 在 spoke 集群中运行以下命令来检查预缓存作业的状态：

   $ oc get jobs,pods -n openshift-talm-pre-cache

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   输出示例

   NAME                  COMPLETIONS   DURATION   AGE
   job.batch/pre-cache   0/1           3m10s      3m10s
   
   NAME                     READY   STATUS    RESTARTS   AGE
   pod/pre-cache--1-9bmlr   1/1     Running   0          3m10s

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4. 运行以下命令，检查 ClusterGroupUpgrade CR 的状态：

   $ oc get cgu -n ztp-group-du-sno du-upgrade-4918 -o jsonpath='{.status}'

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   输出示例

   "conditions": [
       {
         "lastTransitionTime": "2022-01-27T19:30:41Z",
         "message": "The ClusterGroupUpgrade CR has all clusters compliant with all the managed policies",
         "reason": "UpgradeCompleted",
         "status": "True",
         "type": "Ready"
       },
       {
         "lastTransitionTime": "2022-01-27T19:28:57Z",
         "message": "Precaching is completed",
         "reason": "PrecachingCompleted",
         "status": "True",
         "type": "PrecachingDone" 

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       }

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   预缓存任务已完成。