UnitedDeployment

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。

UnitedDeployment用户手册

创建UnitedDeployment

  • 利用deployment template创建一个UnitedDeployment
  1. $ cat <<EOF | kubectl apply -f -
  2. apiVersion: apps.openyurt.io/v1alpha1
  3. kind: UnitedDeployment
  4. metadata:
  5.   labels:
  6.     controller-tools.k8s.io: "1.0"
  7.   name: ud-test
  8. spec:
  9.   selector:
  10.     matchLabels:
  11.       app: ud-test
  12.   workloadTemplate:
  13.     deploymentTemplate:
  14.       metadata:
  15.         labels:
  16.           app: ud-test
  17.       spec:
  18.         template:
  19.           metadata:
  20.             labels:
  21.               app: ud-test
  22.           spec:
  23.             containers:
  24.               - name: nginx
  25.                 image: nginx:1.19.3
  26.   topology:
  27.     pools:
  28.     - name: beijing 
  29.       nodeSelectorTerm:
  30.         matchExpressions:
  31.         - key: apps.openyurt.io/nodepool
  32.           operator: In
  33.           values:
  34.           - beijing 
  35.       replicas: 1
  36.     - name: hangzhou 
  37.       nodeSelectorTerm:
  38.         matchExpressions:
  39.         - key: apps.openyurt.io/nodepool
  40.           operator: In
  41.           values:
  42.           - hangzhou 
  43.       replicas: 2
  44.       tolerations:
  45.       - effect: NoSchedule
  46.         key: apps.openyurt.io/example
  47.         operator: Exists
  48.   revisionHistoryLimit: 5 
  49. EOF
  • 查看UnitedDeployment
  1. $ kubectl get ud
  3. NAME      READY   WORKLOADTEMPLATE   AGE
  4. ud-test   3       Deployment         120m

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. ud-test-beijing-fp58z    1/1     1            1           122m
  5. ud-test-hangzhou-xv454   2/2     2            2           122m
  6. $ kubectl get pod -l app=ud-test
  8.   NAME                                      READY   STATUS    RESTARTS   AGE
  9. ud-test-beijing-fp58z-787d5b6b54-g4jk6    1/1     Running   0          100m
  10. ud-test-hangzhou-xv454-5cd9c4f6b5-b5tsr   1/1     Running   0          124m
  11. ud-test-hangzhou-xv454-5cd9c4f6b5-gmbgp   1/1     Running   0          124m

为UnitedDeployment添加patch功能

  • 在文件uniteddeployment_deployment_test.yaml中添加patch字段，如下所示，文件36到41行
  1. $ kubectl get ud ud-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UnitedDeployment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 ud-test-beijing-fp58z -o yaml
  3. containers:
  4.   - image: nginx:1.19.0
  5. $ kubectl get deploy ud-test-hangzhou-xv454 -o yaml
  7. containers:
  8.   - image: nginx:1.19.3
  • 删除后，所有由UnitedDeployment创建的pod又恢复使用相同的镜像nginx1.19.3
  1. $ kubectl get pod ud-test-beijing-fp58z-787d5b6b54-g4jk6 -o yaml
  3. containers:
  4.   - image: nginx:1.19.3
  5. $ kubectl get pod ud-test-hangzhou-xv454-5cd9c4f6b5-b5tsr -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。