模拟题目

设置配置环境：

[candidate@node-1] $ kubectl config use-context k8s

Task

namespace goshawk 中名为 chipmunk-service 的 Service 指向名为 current-chipmunk-deployment 的 Deployment 创建的 5 个 Pod
canary-0

你可以在 /ckad/goshawk中找到 current-chipmunk-deployment 的清单文件。

  1. 在同一 namespace 中创建一个 相同的 Deployment 名为 canary-chipmunk-deployment
  2. 修改 Deployment 以便
    • 在 namespace goshawk 中运行的 Pod 的最大数量为 10 个
    • chipmunk.service 流量的 40%流向 Pod canary-chipmunk-deployment
      canary-1

参考

https://kubernetes.io/zh-cn/docs/concepts/cluster-administration/manage-deployment/#canary-deployments
https://kubernetes.io/zh-cn/docs/concepts/workloads/controllers/deployment/#canary-deployment

kubectl -h
kubectl scale -h

解答

切换环境

kubectl config use-context k8s

copy一份yaml文件,并进行编辑, 修改为canary-chipmunk-deployment部署的yaml

cd /ckad/goshawk/
cp current-chipmunk-deployment.yaml canary-chipmunk-deployment.yaml
vim canary-chipmunk-deployment.yaml

canary-chipmunk-deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: canary-chipmunk-deployment #修改为题目要求
  namespace: goshawk #修改为题目要求
spec:
  replicas: 1
  selector:
    matchLabels:
      app: canary-chipmunk-deployment #修改为题目要求
      run: dep-svc #确保和current-chipmunk-deployment都有此标签
  template:
    metadata:
      labels:
        app: canary-chipmunk-deployment #修改为题目要求
        run: dep-svc #确保和current-chipmunk-deployment都有此标签
    spec:
      containers:
      - image: vicuu/nginx:hi
        name: nginx

创建canary pod

kubectl apply -f canary-chipmunk-deployment.yaml

根据题目, 10个pod ,current 60%,canary 40%, 如果是其他比例也要灵活, 比如8:2等

kubectl -n goshawk scale deployment current-chipmunk-deployment --replicas 6
kubectl -n goshawk scale deployment canary-chipmunk-deployment --replicas 4

查看pod

kubectl -n goshawk get pod

canary-2

测试

kubectl -n goshawk get svc -owide
for i in {1..1000} ; do  curl -qs 10.109.141.220;done | sort |uniq -c

进行1000此请求计算百分比, 流量6:4

canary-3