Lab 1에 이은 Lab 2입니다. replica를 만들고 모니터링하는 방법을 실습하는 내용입니다.
---- Scale apps with replicas
1. replica set 업데이트
먼저 Lab 1에서 배포한 deployment를 조회합니다.
[root@db2 Lab 2]# kubectl get deployment
NAME READY UP-TO-DATE AVAILABLE AGE
hello-world 1/1 1 1 30m
edit명령으로 deployment 설정파일을 수정합니다.
kubectl edit deployment
spec:
progressDeadlineSeconds: 600
replicas: 1 // 1을 10으로 변경하고 저장 //
revisionHistoryLimit: 10
selector:
matchLabels:
run: hello-world
strategy:
rollingUpdate:
maxSurge: 25%
maxUnavailable: 25%
type: RollingUpdate
template:
metadata:
creationTimestamp: null
labels:
run: hello-world
[root@db2 Lab 2]# kubectl edit deployment hello-world
deployment.apps/hello-world edited
2. 변경한 사항 적용하기
kubectl rollout status deployment/hello-world
[root@db2 Lab 2]# kubectl rollout status deployment/hello-world
deployment "hello-world" successfully rolled out
3. pod 확인하기
kubectl get pods
[root@db2 Lab 2]# kubectl get pods
NAME READY STATUS RESTARTS AGE
hello-world-684dfdd9c5-b48hq 1/1 Running 0 2m32s
hello-world-684dfdd9c5-gjf4p 1/1 Running 0 35m
hello-world-684dfdd9c5-jqssq 1/1 Running 0 2m32s
hello-world-684dfdd9c5-nwx8x 1/1 Running 0 2m32s
hello-world-684dfdd9c5-p9ccg 1/1 Running 0 2m32s
hello-world-684dfdd9c5-q6grb 1/1 Running 0 2m32s
hello-world-684dfdd9c5-sw7qt 1/1 Running 0 2m32s
hello-world-684dfdd9c5-tbswg 1/1 Running 0 2m32s
hello-world-684dfdd9c5-vq9jn 1/1 Running 0 2m32s
hello-world-684dfdd9c5-w8xwp 1/1 Running 0 2m32s
----------- Update and roll back apps
1. 새 컨테이너 빌드
ibmcloud cr build --tag us.icr.io/<my_namespace>/hello-world:2 .
[root@db2 Lab 2]# ibmcloud cr build --tag us.icr.io/skjeong4/hello-world:2 .
Sending build context to Docker daemon 14.85kB
Step 1/6 : FROM node:9.4.0-alpine
---> b5f94997f35f
Step 2/6 : COPY app.js .
---> Using cache
---> 7709ec5f4400
Step 3/6 : COPY package.json .
---> Using cache
---> e7a815f63218
Step 4/6 : RUN npm install && apk update && apk upgrade
---> Using cache
---> 8cf455abe99a
Step 5/6 : EXPOSE 8080
---> Using cache
---> 6d43110f568e
Step 6/6 : CMD node app.js
---> Using cache
---> 34a819beea5a
Successfully built 34a819beea5a
Successfully tagged us.icr.io/skjeong4/hello-world:2
The push refers to repository [us.icr.io/skjeong4/hello-world]
99f142d4db2d: Layer already exists
9043b37014f9: Layer already exists
7eab2e812ea7: Layer already exists
0804854a4553: Layer already exists
6bd4a62f5178: Layer already exists
9dfa40a0da3b: Layer already exists
2: digest: sha256:a22a1e31c72344a671dad2c2343bb9238929b3c140306b986a187fc16e268c93 size: 1576
OK
[root@db2 Lab 2]# ibmcloud cr images
Listing images...
Repository Tag Digest Namespace Created Size Security status
us.icr.io/skjeong4/hello-world 2 a22a1e31c723 skjeong4 1 hour ago 27 MB No Issues
us.icr.io/skjeong4/hello-world latest a22a1e31c723 skjeong4 1 hour ago 27 MB No Issues
OK
2. 새 컨테이너를 기존 deployment에 업데이트
kubectl set image deployment/hello-world hello-world=us.icr.io//hello-world:2
[root@db2 Lab 2]# kubectl set image deployment/hello-world hello-world=us.icr.io/skjeong4/hello-world:2
deployment.apps/hello-world image updated
3. 업데이트 내역 확인
kubectl rollout status deployment/hello-world
kubectl get replicasets
[root@db2 Lab 2]# kubectl rollout status deployment/hello-world
deployment "hello-world" successfully rolled out
[root@db2 Lab 2]# kubectl get replicasets
NAME DESIRED CURRENT READY AGE
hello-world-5c6cb477cf 10 10 10 5m12s
hello-world-684dfdd9c5 0 0 0 109m
4. 어플리케이션 실행 테스트 (curl 또는 웹)
curl <public-IP>:<nodeport>
[root@db2 Lab 2]# curl xxx.xxx.xx.xxx:32412
Hello world from hello-world-5c6cb477cf-7r9dv! Your app is up and running in a cluster!
5. 업데이트 롤백하기
kubectl rollout undo deployment/<name-of-deployment>
[root@db2 Lab 2]# kubectl rollout undo deployment/hello-world
deployment "hello-world" successfully rolled out
---- Check the health of apps
1. Lab 2 디렉토리의 healthcheck.yml 파일 수정
image: ".icr.io//hello-world:2"
=> image: ".icr.io/skjeong4/hello-world:2"
2. IBM 클라우드의 클러스터 대시보드에서 디플로이먼트/파드/레플리카셋등 확인
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