요즘 IBM Badge 모으는 재미에 빠졌네요. 오늘은 쿠버네티스 기본에 대해서 공부했습니다.
과정명은 Container & Kubernetes Essentials with IBM Cloud입니다.
Lab 1의 과정을 정리해봤습니다. 제가 연습한 실습 환경은 CentOS 7입니다.
아래 사이트를 순서대로 따라한 것입니다. 조금 시행착오는 있을 수 있는데 어렵지 않습니다.
참고 사이트 :
https://cloud.ibm.com/docs/cli?topic=cloud-cli-getting-started
https://github.com/IBM/container-service-getting-started-wt
---- 초기 구성
1. IBM Cloud CLI 설치
Linux에서 IBM Cloud에 접근할 수 있는 커맨드라인 인터페이스를 설치합니다.
curl -sL https://ibm.biz/idt-installer | bash
2. IBM Cloud 로그인
ibmcloud login -a cloud.ibm.com -r us-south -g default
ibmcloud ks cluster config --cluster bpkadubd0gijteu5rpt0
[root@db2 ~]# ibmcloud ks cluster ls
OK
Name ID State Created Workers Location Version Resource Group Name Provider
mycluster bpkadubd0gijteu5rpt0 normal 5 days ago 1 Dallas 1.16.7_1524 default classic
---- IBM Cloud에 이미지 푸시
1. 네임스페이스 추가
<참고> 도커 데몬이 실행중인지 확인, 실행중이 아니라면 도커 데몬 실행
systemctl status docker
systemctl start docker
ibmcloud cr login
ibmcloud cr namespace-add <my_namespace>
[root@db2 Lab 1]# ibmcloud cr namespace-add skjeong4
Adding namespace 'skjeong4'...
Successfully added namespace 'skjeong4'
OK
2. Lab 1 폴더로 이동하여 도커 이미지 빌드
ibmcloud cr build --tag us.icr.io/<my_namespace>/hello-world .
[root@db2 Lab 1]# ibmcloud cr build --tag us.icr.io/skjeong4/hello-world .
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:latest
The push refers to repository [us.icr.io/skjeong4/hello-world]
99f142d4db2d: Pushed
9043b37014f9: Pushed
7eab2e812ea7: Pushed
0804854a4553: Pushed
6bd4a62f5178: Pushed
9dfa40a0da3b: Pushed
latest: digest: sha256:a22a1e31c72344a671dad2c2343bb9238929b3c140306b986a187fc16e268c93 size: 1576
OK
3. 도커 이미지 빌드 확인
[root@db2 Lab 1]# ibmcloud cr images
Listing images...
Repository Tag Digest Namespace Created Size Security status
us.icr.io/skjeong4/hello-world latest a22a1e31c723 skjeong4 30 minutes ago 27 MB No Issues
OK
---- 배포
1. 클러스터 설정 파일 가져오기 및 환경변수 적용
ibmcloud ks cluster-config <yourclustername>
[root@db2 Lab 1]# ibmcloud ks cluster-config mycluster
WARNING: This legacy command is deprecated and will soon be unsupported. Use the 'ibmcloud ks cluster config' command instead.
For more information, see 'https://ibm.biz/iks-cli-v1'
WARNING: The behavior of this command in your current CLI version is deprecated, and becomes unsupported when CLI version 1.0 is released in March 2020. To use the new behavior now, set the 'IKS_BETA_VERSION' environment variable. In bash, run 'export IKS_BETA_VERSION=1'.
Note: Changing the beta version can include other breaking changes. For more information, see 'https://ibm.biz/iks-cli-v1'
OK
The configuration for mycluster was downloaded successfully.
Export environment variables to start using Kubernetes.
export KUBECONFIG=/root/.bluemix/plugins/container-service/clusters/mycluster/kube-config-hou02-mycluster.yml
2. 클러스터에 이미지 배포 - pod 생성
kubectl run hello-world --image=us.icr.io/<namespace>/hello-world
[root@db2 Lab 1]# kubectl delete deployment hello-world
deployment.apps "hello-world" deleted
[root@db2 Lab 1]# kubectl run hello-world --image=us.icr.io/skjeong4/hello-world
kubectl run --generator=deployment/apps.v1 is DEPRECATED and will be removed in a future version. Use kubectl run --generator=run-pod/v1 or kubectl create instead.
deployment.apps/hello-world created
3. pod 생성 확인
kubectl get pods
[root@db2 Lab 1]# kubectl get pods
NAME READY STATUS RESTARTS AGE
hello-world-684dfdd9c5-gjf4p 0/1 ContainerCreating 0 5s
[root@db2 Lab 1]# kubectl get pods
NAME READY STATUS RESTARTS AGE
hello-world-684dfdd9c5-gjf4p 1/1 Running 0 10s
참고 > pod 생성에 오류가 있는 경우 확인 방법
[root@db2 Lab 1]# kubectl get pods
NAME READY STATUS RESTARTS AGE
hello-world-5dd7d6d7d4-78g4h 0/1 ErrImagePull 0 3s
[root@db2 Lab 1]# kubectl delete deployment hello-world
deployment.apps "hello-world" deleted
[root@db2 Lab 1]# kubectl describe pod hello-world-5dd7d6d7d4-78g4h
Name: hello-world-5dd7d6d7d4-78g4h
Namespace: default
Priority: 0
PriorityClassName:
Node: 10.77.223.248/10.77.223.248
Start Time: Thu, 12 Mar 2020 10:47:52 +0900
Labels: pod-template-hash=5dd7d6d7d4
run=hello-world
Annotations: kubernetes.io/psp: ibm-privileged-psp
Status: Pending
IP: xxx.xx.xx.xx
Controlled By: ReplicaSet/hello-world-5dd7d6d7d4
Containers:
hello-world:
Container ID:
Image: us.icr.io/skjeong4/hello-world:1
Image ID:
Port:
Host Port:
State: Waiting
Reason: ImagePullBackOff
Ready: False
Restart Count: 0
Environment:
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from default-token-zj8ts (ro)
Conditions:
Type Status
Initialized True
Ready False
ContainersReady False
PodScheduled True
Volumes:
default-token-zj8ts:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-zj8ts
Optional: false
QoS Class: BestEffort
Node-Selectors:
Tolerations: node.kubernetes.io/not-ready:NoExecute for 600s
node.kubernetes.io/unreachable:NoExecute for 600s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 13s default-scheduler Successfully assigned default/hello-world-5dd7d6d7d4-78g4h to 10.77.223.248
Warning Failed 12s kubelet, 10.77.223.248 Failed to pull image "us.icr.io/skjeong4/hello-world:1": rpc error: code = NotFound desc = failed to pull and unpack image "us.icr.io/skjeong4/hello-world:1": failed to resolve reference "us.icr.io/skjeong4/hello-world:1": us.icr.io/skjeong4/hello-world:1: not found
Warning Failed 12s kubelet, 10.77.223.248 Error: ErrImagePull
Normal BackOff 11s kubelet, 10.77.223.248 Back-off pulling image "us.icr.io/skjeong4/hello-world:1"
Warning Failed 11s kubelet, 10.77.223.248 Error: ImagePullBackOff
Normal Pulling 0s (x2 over 12s) kubelet, 10.77.223.248 Pulling image "us.icr.io/skjeong4/hello-world:1"
3. 해당 pod에 서비스 포트 할당
kubectl expose deployment/hello-world --type="NodePort" --port=8080
[root@db2 Lab 1]# kubectl expose deployment/hello-world --type="NodePort" --port=8080
service/hello-world exposed
4. 클러스터에 배포된 포트 확인
kubectl describe service <name-of-deployment>
[root@db2 Lab 1]# kubectl describe service hello-world
Name: hello-world
Namespace: default
Labels: run=hello-world
Annotations:
Selector: run=hello-world
Type: NodePort
IP: xxx.xx.xxx.xxx
Port: 8080/TCP
TargetPort: 8080/TCP
NodePort: 32412/TCP
Endpoints: xxx.xx.xx.xx:8080
Session Affinity: None
External Traffic Policy: Cluster
Events:
5. 클러스터의 Public IP 확인
ibmcloud ks workers <name-of-cluster>
[root@db2 script]# ibmcloud ks workers mycluster
OK
ID Public IP Private IP Flavor State Status Zone Version
kube-bpkadubd0gijteu5rpt0-mycluster-default-00000094 xxx.xxx.xx.xxx xx.xx.xxx.xxx free normal Ready hou02 1.16.7_1525
6. 클러스터에 배포된 어플리케이션 실행
curl <public-IP>:<nodeport>
[root@db2 Lab 3]# curl xxx.xxx.xx.xxx:32412
Hello world from hello-world-684dfdd9c5-fll85! Your app is up and running in a cluster!'cloud' 카테고리의 다른 글
| Kubernetes Essentials with IBM Cloud - Lab 2 (0) | 2020.03.18 |
|---|