YurtAppSet

在上一篇文章 中我们介绍了节点池的使用，主要是节点池的创建和管理，进一步，我们开发了基于节点池的应用单元化部署能力，提高用户的运维效率。

在这篇文章中，我们将展示yurt-app-manager如何帮助用户管理工作负载。假设我们已经拥有一个基于原生kubernetes搭建起来的OpenYurt集群，且至少有两个节点。

YurtAppSet用户手册

创建YurtAppSet

  • 通过yurtappset_test.yaml创建一个YurtAppSet
  1. apiVersion: apps.openyurt.io/v1alpha1
  2. kind: YurtAppSet
  3. metadata:
  4.   labels:
  5.     controller-tools.k8s.io: "1.0"
  6.   name: yas-test
  7. spec:
  8.   selector:
  9.     matchLabels:
  10.       app: yas-test
  11.   workloadTemplate:
  12.     deploymentTemplate:
  13.       metadata:
  14.         labels:
  15.           app: yas-test
  16.       spec:
  17.         template:
  18.           metadata:
  19.             labels:
  20.               app: yas-test
  21.           spec:
  22.             containers:
  23.               - name: nginx
  24.                 image: nginx:1.19.3
  25.   topology:
  26.     pools:
  27.     - name: beijing 
  28.       nodeSelectorTerm:
  29.         matchExpressions:
  30.         - key: apps.openyurt.io/nodepool
  31.           operator: In
  32.           values:
  33.           - beijing 
  34.       replicas: 1
  35.     - name: hangzhou 
  36.       nodeSelectorTerm:
  37.         matchExpressions:
  38.         - key: apps.openyurt.io/nodepool
  39.           operator: In
  40.           values:
  41.           - hangzhou 
  42.       replicas: 2
  43.       tolerations:
  44.       - effect: NoSchedule
  45.         key: apps.openyurt.io/example
  46.         operator: Exists
  47.   revisionHistoryLimit: 5
  • 查看YurtAppSet
  1. $ kubectl get yas
  3. NAME       READY   WORKLOADTEMPLATE   AGE
  4. yas-test   3       Deployment         43s

检查由yurt-app-manager组件创建的deployment

  1. $ kubectl get deploy
  3. NAME                      READY   UP-TO-DATE   AVAILABLE   AGE
  4. yas-test-beijing-k5st4    1/1     1            1           54s
  5. yas-test-hangzhou-2jkj5   2/2     2            2           54s
  6. $ kubectl get pod -l app=yas-test
  8. NAME                                       READY   STATUS    RESTARTS   AGE
  9. yas-test-beijing-k5st4-56bc98cc7d-h7h86    1/1     Running   0          72s
  10. yas-test-hangzhou-2jkj5-64588c484b-8mvn8   1/1     Running   0          72s
  11. yas-test-hangzhou-2jkj5-64588c484b-vx85t   1/1     Running   0          72s

为YurtAppSet添加patch功能

  • 在文件yurtappset_test.yaml中添加patch字段，如下所示，文件36到41行
  1. $ kubectl get yas yas-test -o yaml
  3.   topology:
  4.     pools:
  5.     - name: beijing 
  6.       nodeSelectorTerm:
  7.         matchExpressions:
  8.         - key: apps.openyurt.io/nodepool
  9.           operator: In
  10.           values:
  11.           - beijing 
  12.       replicas: 1
  13.       patch:
  14.         spec:
  15.           template:
  16.             spec:
  17.               containers:
  18.                 - name: nginx
  19.                   image: nginx:1.19.0
  20.     - name: hangzhou 
  21.       nodeSelectorTerm:
  22.         matchExpressions:
  23.         - key: apps.openyurt.io/nodepool
  24.           operator: In
  25.           values:
  26.           - hangzhou 
  27.       replicas: 2
  28.       tolerations:
  29.   ***
  • patch能够使得由YurtAppSet创建的位于北京节点池的deployment和pod中nginx镜像版本为1.19.0，而其他地区的nginx镜像版本为1.19.3。
  1. $ kubectl get deploy yas-test-beijing-k5st4 -o yaml
  3. containers:
  4.   - image: nginx:1.19.0
  5. $ kubectl get deploy yas-test-hangzhou-2jkj5 -o yaml
  7. containers:
  8.   - image: nginx:1.19.3
  • 删除后，所有由YurtAppSet创建的pod又恢复使用相同的镜像nginx1.19.3
  1. $ kubectl get pod yas-test-beijing-k5st4-974b6958c-t2kfn -o yaml
  3. containers:
  4.   - image: nginx:1.19.3
  5. $ kubectl get pod yas-test-hangzhou-2jkj5-64588c484b-8mvn8 -o yaml
  6. containers:
  7.   - image: nginx:1.19.3
  • 结论：Patch功能解决了nodepool单属性的升级和应用完整发布。