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
apiVersion: apps.openyurt.io/v1alpha1
kind: YurtAppSet
metadata:
labels:
controller-tools.k8s.io: "1.0"
name: yas-test
spec:
selector:
matchLabels:
app: yas-test
workloadTemplate:
deploymentTemplate:
metadata:
labels:
app: yas-test
spec:
template:
metadata:
labels:
app: yas-test
spec:
containers:
- name: nginx
image: nginx:1.19.3
topology:
pools:
- name: beijing
nodeSelectorTerm:
matchExpressions:
- key: apps.openyurt.io/nodepool
operator: In
values:
- beijing
replicas: 1
- name: hangzhou
nodeSelectorTerm:
matchExpressions:
- key: apps.openyurt.io/nodepool
operator: In
values:
- hangzhou
replicas: 2
tolerations:
- effect: NoSchedule
key: apps.openyurt.io/example
operator: Exists
revisionHistoryLimit: 5
- 查看YurtAppSet
$ kubectl get yas
NAME READY WORKLOADTEMPLATE AGE
yas-test 3 Deployment 43s
检查由yurt-app-manager组件创建的deployment
$ kubectl get deploy
NAME READY UP-TO-DATE AVAILABLE AGE
yas-test-beijing-k5st4 1/1 1 1 54s
yas-test-hangzhou-2jkj5 2/2 2 2 54s
$ kubectl get pod -l app=yas-test
NAME READY STATUS RESTARTS AGE
yas-test-beijing-k5st4-56bc98cc7d-h7h86 1/1 Running 0 72s
yas-test-hangzhou-2jkj5-64588c484b-8mvn8 1/1 Running 0 72s
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
$ kubectl get yas yas-test -o yaml
topology:
pools:
- name: beijing
nodeSelectorTerm:
matchExpressions:
- key: apps.openyurt.io/nodepool
operator: In
values:
- beijing
replicas: 1
patch:
spec:
template:
spec:
containers:
- name: nginx
image: nginx:1.19.0
- name: hangzhou
nodeSelectorTerm:
matchExpressions:
- key: apps.openyurt.io/nodepool
operator: In
values:
- hangzhou
replicas: 2
tolerations:
***
- 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。
$ kubectl get deploy yas-test-beijing-k5st4 -o yaml
containers:
- image: nginx:1.19.0
$ kubectl get deploy yas-test-hangzhou-2jkj5 -o yaml
containers:
- 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
$ kubectl get pod yas-test-beijing-k5st4-974b6958c-t2kfn -o yaml
containers:
- image: nginx:1.19.3
$ kubectl get pod yas-test-hangzhou-2jkj5-64588c484b-8mvn8 -o yaml
containers:
- 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。