上面的OpenShift集群代表了运行在AWS东部区域（俄亥俄）的研发测试环境。
Portworx存储集群支撑了附加在这些Pod上的持久卷。
下面的卷附加到了MySQL pod上。
对于WordPress CMS, 有个共享的Portworx卷附加到了Pod上。
配置好的应用，可以通过WordPress相关的服务来访问。
为了完成这一步，你需要AWS账户的访问密钥和Secret密钥。如果你已经配置好了AWS CLI，可以在这里发现这些密钥。 ~/.aws/credentials
回到生产环境集群，运行下面的命令来复制UUID。
PX_POD=$(oc get pods -l name=portworx -n kube-system -o jsonpath='{.items[0].metadata.name}')oc -n=kube-system exec $PX_POD -- /opt/pwx/bin/pxctl status
记下集群的UUID，放在一个安全的地方。
我们在生产环境内，来创建生产环境集群的身份验证信息。
oc -n=kube-system exec $PX_POD -- /opt/pwx/bin/pxctl credentials create \ --provider s3 \ --s3-access-key \ --s3-secret-key \ --s3-region ap-southeast-1 \ --s3-endpoint s3.ap-southeast-1.amazonaws.com clusterPair_c02528e3-30b1-43e7-91c0-c26c111d57b3
确保身份验证信息的名称按照这样的格式：‘clusterPair_UUID’。
回到研发测试集群，重复操作来创建身份验证信息。
PX_POD=$(oc get pods -l name=portworx -n kube-system -o jsonpath='{.items[0].metadata.name}')oc -n=kube-system exec $PX_POD -- /opt/pwx/bin/pxctl cluster token show
oc describe svc portworx-service -n kube-system
到这里，你已经准备好下面的数据了：
1. 目标集群的Token
2. 指向Portworx服务的负载均衡的CNAME
创建集群配对参数
我们从生产环境（目标集群）来创建YAML文件。并且把它应用到研发测试环境（源集群）。
确保你在在生产环境中，运行下面的命令。
storkctl generate clusterpair -n cms prodcluster > clusterpair.yaml
打开clusterpair.yaml，在选项中增加下面的细节信息。它们反映了目标集群里的负载均衡的IP地址或者DNS名称，以及与目标集群关联的Token。
为Kubemotion进行集群配对
通过为源集群配置配对参数，我们可以把集群进行配对。
我们回到源集群（研发测试环境），来进行集群配对。
oc apply -f clusterpair.yaml oc get clusterpair -n cms
<pre>oc getclusterpairs</pre> 的输出确认了配对已经成功。
验证配对状态
我们可以通过 storkctl CLI来验证配对状态。确保存储的状态，和调度器的状态都是正常，没有错误。
storkctl -n=cms get clusterpair
我们验证了，源集群和目标集群已经配对成功。
现在我们开始迁移。
从源集群向目标集群迁移CMS应用
在研发测试环境下，通过下面的步骤开始CMS应用的迁移。
开始迁移
用下面的内容创建一个名为migration.yaml的YAML文件。
apiVersion: stork.libopenstorage.org/v1alpha1 kind: Migrationmetadata: name: cmsmigration namespace: cms spec: # This should be the name of the cluster pair created above clusterPair: prodcluster # If set to false this will migrate only the Portworx volumes. No PVCs, apps, etc will be migrated includeResources: true # If set to false, the deployments and stateful set replicas will be set to 0 on the destination. # There will be an annotation with "stork.openstorage.org/migrationReplicas" on the destinationto store the replica count from the source. startApplications: true # List of namespaces to migrate namespaces: - cms
这里包括一些很重要的信息，例如集群配对的名称、迁移中包括的命名空间，需要被迁移的资源类型。
把YAML文件提交到研发测试集群，来开始迁移。
oc apply -f migration.yaml migration.stork.libopenstorage.org/cmsmigration created
监控迁移的过程
使用storkctl我们来监控迁移的过程。
storkctl get migration -n cms
一旦迁移完成， storkctl 会报告最后迁移到目标集群的卷的数量以及资源。
通过下面的命令，可以得到迁移过程的详细信息。
oc describe migration cmsmigration -n=cms% oc describe migration cmsmigration -n=cmsName: cmsmigrationNamespace: cmsLabels:Annotations: kubectl.kubernetes.io/last-applied-configuration:
{"apiVersion":"stork.libopenstorage.org/v1alpha1","kind":"Migration","metadata":{"annotations":{},"name":"cmsmigration","namespace":"cms"}...API Version: stork.libopenstorage.org/v1alpha1Kind: MigrationMetadata:
Creation Timestamp: 2019-11-08T02:33:44Z
Generation: 9
Resource Version: 346702
Self Link: /apis/stork.libopenstorage.org/v1alpha1/namespaces/cms/migrations/cmsmigration
UID: 2eeb5d56-01d0-11ea-a393-02fec625b80aSpec:
Admin Cluster Pair:
Cluster Pair: prodcluster Include Resources: true
Include Volumes: true
Namespaces:
cms Post Exec Rule:
Pre Exec Rule:
Selectors:
Start Applications: trueStatus:
Finish Timestamp: 2019-11-08T02:34:56Z
Resources:
Group: core Kind: PersistentVolume
Name: pvc-ac60362f-0170-11ea-8418-06c5879a6a7a
Namespace:
Reason: Resource migrated successfully Status: Successful
Version: v1 Group: core Kind: PersistentVolume
Name: pvc-c5dd1955-0170-11ea-a393-02fec625b80a
Namespace:
Reason: Resource migrated successfully Status: Successful
Version: v1 Group: core Kind: Service
Name: mysql Namespace: cms Reason: Resource migrated successfully Status: Successful
Version: v1 Group: core Kind: Service
Name: wordpress Namespace: cms Reason: Resource migrated successfully Status: Successful
Version: v1 Group: core Kind: PersistentVolumeClaim
Name: px-mysql-pvc Namespace: cms Reason: Resource migrated successfully Status: Successful
Version: v1 Group: core Kind: PersistentVolumeClaim
Name: px-wp-pvc Namespace: cms Reason: Resource migrated successfully Status: Successful
Version: v1 Group: apps Kind: Deployment
Name: mysql Namespace: cms Reason: Resource migrated successfully Status: Successful
Version: v1 Group: apps Kind: Deployment
Name: wordpress Namespace: cms Reason: Resource migrated successfully Status: Successful
Version: v1 Group: route.openshift.io Kind: Route
Name: wp Namespace: cms Reason: Resource migrated successfully Status: Successful
Version: v1 Stage: Final
Status: Successful
Volumes:
Namespace: cms Persistent Volume Claim: px-mysql-pvc Reason: Migration successful for volume Status: Successful
Volume: pvc-ac60362f-0170-11ea-8418-06c5879a6a7a
Namespace: cms Persistent Volume Claim: px-wp-pvc Reason: Migration successful for volume Status: Successful
Volume: pvc-c5dd1955-0170-11ea-a393-02fec625b80aEvents:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Successful 82s stork Volume pvc-ac60362f-0170-11ea-8418-06c5879a6a7a migrated successfully Normal Successful 82s stork Volume pvc-c5dd1955-0170-11ea-a393-02fec625b80a migrated successfully Normal Successful 78s stork /v1, Kind=PersistentVolume /pvc-ac60362f-0170-11ea-8418-06c5879a6a7a: Resource migrated successfully Normal Successful 78s stork /v1, Kind=PersistentVolume /pvc-c5dd1955-0170-11ea-a393-02fec625b80a: Resource migrated successfully Normal Successful 78s stork /v1, Kind=Service cms/mysql: Resource migrated successfully Normal Successful 78s stork /v1, Kind=Service cms/wordpress: Resource migrated successfully Normal Successful 78s stork /v1, Kind=PersistentVolumeClaim cms/px-mysql-pvc: Resource migrated successfully Normal Successful 78s stork /v1, Kind=PersistentVolumeClaim cms/px-wp-pvc: Resource migrated successfully Normal Successful 78s stork apps/v1, Kind=Deployment cms/mysql: Resource migrated successfully Normal Successful 77s (x2 over 78s) stork (combined from similar events): route.openshift.io/v1, Kind=Route cms/wp: Resource migrated successfully
在生产环境上验证迁移
回到生产环境，我们来检查CMS命名空间里的所有资源。
oc get all -n cms
你可以通过为WordPress Pod使用port-forwardding，来访问应用。
小结
Kubemotion为有状态应用增加了迁移功能。它可以在本地环境和云环境之间，以及多云环境之间，无缝的迁移卷。
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