版本管理

组件版本

你可以通过字段 spec.components[*].externalRevision 在 Application 中指定即将生成的组件实例版本名称。

apiVersion: core.oam.dev/v1beta1
kind: Application
metadata:
  name: myapp
spec:
  components:
    - name: express-server
      type: webservice
      externalRevision: express-server-v1
      properties:
        image: stefanprodan/podinfo:4.0.3

如果没有主动指定版本名称，会根据规则 <component-name>-<revision-number> 自动生成。

应用创建以后，你就可以看到系统中生成了 ControllerRevision 对象来记录组件版本。

获取组件实例的版本记录

$ kubectl get controllerrevision -l controller.oam.dev/component=express-server
NAME                CONTROLLER                       REVISION   AGE
express-server-v1   application.core.oam.dev/myapp   1          2m40s
express-server-v2   application.core.oam.dev/myapp   2          2m12s

你可以在灰度发布功能中进一步利用组件实例版本化以后的功能。

应用版本

除了工作流字段，应用中的每个字段更新都会生成一个对应的版本快照。

查看版本快照

$ kubectl get apprev -l app.oam.dev/name=myapp
NAME       AGE
myapp-v1   54m
myapp-v2   53m
myapp-v3   18s

你可以在版本快照中获得应用所关联的所有信息，包括应用的字段以及对应的组件类型、运维能力等。

apiVersion: core.oam.dev/v1beta1
kind: ApplicationRevision
metadata:
  labels:
    app.oam.dev/app-revision-hash: a74b4a514ba2fc08
    app.oam.dev/name: myapp
  name: myapp-v3
  namespace: default
  ...
spec:
  application:
    apiVersion: core.oam.dev/v1beta1
    kind: Application
    metadata:
      name: myapp
      namespace: default
      ...
    spec:
      components:
      - name: express-server
        properties:
          image: stefanprodan/podinfo:5.0.3
        type: webservice@v1
     ...
  componentDefinitions:
    webservice:
      apiVersion: core.oam.dev/v1beta1
      kind: ComponentDefinition
      metadata:
        name: webservice
        namespace: vela-system
        ...
      spec:
        schematic:
          cue:
            ...
  traitDefinitions:
    ...

应用版本对比

部署前版本对比（Live-diff）功能可以让你不用真的对运行时集群进行操作，在本地预览即将部署的版本和线上版本的差异性，并进行确认。

预览所提供的信息，会包括应用部署计划的新增、修改和移除等信息，同时也包括其中的组件和运维特征的相关信息。

假设你的新应用部署计划如下，包含镜像的变化：

# new-app.yaml
apiVersion: core.oam.dev/v1beta1
kind: Application
metadata:
  name: myapp
spec:
  components:
    - name: express-server
      type: webservice@v1
      properties:
        image: crccheck/hello-world # 变更镜像

然后运行 版本对比 功能，使用如下命令：

vela live-diff -f new-app.yaml -r vela-app-v1

通过 -r 或 --revision 参数，指定要比较的版本名称。
通过 -c 或 --context 指定对比差异的上下文行数。

通过 vela live-diff -h 查看更多参数用法。

点击查看对比结果

---
# Application (myapp) has been modified(*)
---
  apiVersion: core.oam.dev/v1beta1
  kind: Application
  metadata:
-   annotations:
-     kubectl.kubernetes.io/last-applied-configuration: |
-       {"apiVersion":"core.oam.dev/v1beta1","kind":"Application","metadata":{"annotations":{},"name":"myapp","namespace":"default"},"spec":{"components":[{"externalRevision":"express-server-v1","name":"express-server","properties":{"image":"stefanprodan/podinfo:4.0.3"},"type":"webservice"}]}}
    creationTimestamp: null
-   finalizers:
-   - app.oam.dev/resource-tracker-finalizer
    name: myapp
    namespace: default
  spec:
    components:
-   - externalRevision: express-server-v1
-     name: express-server
+   - name: express-server
      properties:
-       image: stefanprodan/podinfo:4.0.3
-     type: webservice
+       image: crccheck/hello-world
+     type: webservice@v1
  status:
    rollout:
      batchRollingState: ""
      currentBatch: 0
      lastTargetAppRevision: ""
      rollingState: ""
      upgradedReadyReplicas: 0
      upgradedReplicas: 0
---
## Component (express-server) has been modified(*)
---
  apiVersion: apps/v1
  kind: Deployment
  metadata:
-   annotations:
-     kubectl.kubernetes.io/last-applied-configuration: |
-       {"apiVersion":"core.oam.dev/v1beta1","kind":"Application","metadata":{"annotations":{},"name":"myapp","namespace":"default"},"spec":{"components":[{"externalRevision":"express-server-v1","name":"express-server","properties":{"image":"stefanprodan/podinfo:4.0.3"},"type":"webservice"}]}}
+   annotations: {}
    labels:
      app.oam.dev/appRevision: ""
      app.oam.dev/component: express-server
      app.oam.dev/name: myapp
      app.oam.dev/resourceType: WORKLOAD
-     workload.oam.dev/type: webservice
+     workload.oam.dev/type: webservice-v1
    name: express-server
    namespace: default
  spec:
    selector:
      matchLabels:
        app.oam.dev/component: express-server
    template:
      metadata:
        labels:
          app.oam.dev/component: express-server
          app.oam.dev/revision: KUBEVELA_COMPONENT_REVISION_PLACEHOLDER
      spec:
        containers:
-       - image: stefanprodan/podinfo:4.0.3
+       - image: crccheck/hello-world
          name: express-server
          ports:
          - containerPort: 80

VelaUI 中独立在数据库中记录了应用版本，我们也推荐在数据库中记录元数据历史。