2022-08-05
minikube 關於 replicas 與 rollout 測試
我是用 minikube 自建 registry
minikube addons enable registry
docker run --rm -it --network=host alpine ash -c "apk add socat && socat TCP-LISTEN:5000,reuseaddr,fork TCP:$(minikube ip):5000" &
git 下來 IBM 範例
git clone https://github.com/ibm-developer-skills-network/CC201.git
cd CC201/labs/3_K8sScaleAndUpdate/
把內容換 minikube 的 registry (因裡面有 / 換成 ? 去取代指令的 /)
sed -i 's?us.icr.io/<my_namespace>?localhost:5000?g' deployment.yaml
確認 cat deployment.yaml |grep localhost:5000
image: localhost:5000/hello-world:1
docker image 放 minikube 的 registry
docker build -t localhost:5000/hello-world:1 . && docker push localhost:5000/hello-world:1
確認 image
docker images |grep localhost:5000/hello-world
deployment image
kubectl apply -f deployment.yaml
看部屬狀況
kubectl get pods
發佈 hello-world
kubectl expose deployment/hello-world
把minikube 推出到 8080 (有開過就不必了)
kubectl proxy --port=8080 &
curl -L http://127.0.0.1:8080/api/v1/namespaces/default/services/hello-world/proxy
出現像是
Hello world from hello-world-7c88966754-xzpxb! Your app is up and running!
設定 3 個 POD
kubectl scale deployment hello-world --replicas=3
看部屬狀況
kubectl get pods
測試看是否有多個 POD
for i in `seq 10`; do curl -L http://127.0.0.1:8080/api/v1/namespaces/default/services/hello-world/proxy; done
像是出現 其中POD 序號不同（三種）
Hello world from hello-world-7c88966754-xzpxb! Your app is up and running!
Hello world from hello-world-7c88966754-xzpxb! Your app is up and running!
Hello world from hello-world-7c88966754-xzpxb! Your app is up and running!
Hello world from hello-world-7c88966754-ndwm6! Your app is up and running!
Hello world from hello-world-7c88966754-xzpxb! Your app is up and running!
Hello world from hello-world-7c88966754-xzpxb! Your app is up and running!
Hello world from hello-world-7c88966754-6gg4c! Your app is up and running!
Hello world from hello-world-7c88966754-xzpxb! Your app is up and running!
Hello world from hello-world-7c88966754-ndwm6! Your app is up and running!
Hello world from hello-world-7c88966754-xzpxb! Your app is up and running!
切回1個POD
kubectl scale deployment hello-world --replicas=1
換字 Hello world from 變成 Welcome to
sed -i 's/Hello world from/Welcome to/g' app.js
建立第二版
docker build -t localhost:5000/hello-world:2 . && docker push localhost:5000/hello-world:2
部屬第二版
kubectl set image deployment/hello-world hello-world=localhost:5000/hello-world:2
看更新的狀態
kubectl rollout status deployment/hello-world
瀏覽看看是不是第二版 字 Welcome to
curl -L http://127.0.0.1:8080/api/v1/namespaces/default/services/hello-world/proxy
出現像是
Welcome to hello-world-5c5d6588f-lm5th! Your app is up and running!
回上一版
kubectl rollout undo deployment/hello-world
等成功回版後在 curl 檢查
建立 ConfigMap 顯示 MESSAGE內容
kubectl create configmap app-config --from-literal=MESSAGE="This message came from a ConfigMap!"
把內容換 deployment-configmap-env-var.yaml 的 換成 minikube registry (因裡面有 / 換成 ? 去取代指令的 /)
sed -i 's?us.icr.io/<my_namespace>?localhost:5000?g' deployment-configmap-env-var.yaml
看 app.js 的 res.send
cat app.js |grep res.send
把 res.send換成 configmap-env
export var1="res.send('Welcome to ' + hostname + '! Your app is up and running!"
export var2="res.send(process.env.MESSAGE + '"
sed -i "s#$var1#$var2#g" app.js
建立image 與部屬
docker build -t localhost:5000/hello-world:3 . && docker push localhost:5000/hello-world:3
docker images |grep localhost:5000/hello-world
kubectl apply -f deployment-configmap-env-var.yaml
curl -L http://127.0.0.1:8080/api/v1/namespaces/default/services/hello-world/proxy
看到
This message came from a ConfigMap!
可換 ConfigMap 內容
kubectl delete configmap app-config
kubectl create configmap app-config --from-literal=MESSAGE="This message test !"
砍掉原有的 pod 會換成新的
kubectl delete pod $(kubectl get pod |grep hello-world|awk '{print $1}')
瀏覽
curl -L http://127.0.0.1:8080/api/v1/namespaces/default/services/hello-world/proxy
顯示
This message test !