116.디플로이먼트 롤링 업데이트 및 롤백 6/8
디플로이먼트 롤링 업데이트 및 롤백 6/20
<1> 디플로이먼트 생성
<2> 디플로이먼트 생성 시 record 옵션 사용
<3> 버전 (롤리) 업데이트 실행 및 확인 :
<4> 버전 롤백 : 기존 v1.14 → v1.2
<1> 디플로이먼트 생성
1
cat << EOF > deployment-nginx-1.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: deployment-nginx
spec:
replicas: 3
selector:
matchLabels:
app: cndk-nginx-pods
template:
metadata:
name: cndk-nginx-pod
labels:
app: cndk-nginx-pods
spec:
containers:
- name: nginx
image: nginx:1.11
EOF
<2> 디플로이먼트 생성 시 record 옵션 사용
1
# 생성 시 --record 옵션을 추가
kubectl apply -f deployment-nginx-1.yaml --record
2
# 파드 정보 확인
[root@test11 ~]# kubectl apply -f deployment-nginx-1.yaml --record
Flag --record has been deprecated, --record will be removed in the future
deployment.apps/deployment-nginx created
[root@test11 ~]# kubectl get pod -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
deployment-nginx-77b4cbf48d-8p8s6 0/1 ContainerCreating 0 11s <none> game1-nodepool-w-11gc <none> <none>
deployment-nginx-77b4cbf48d-wrt49 0/1 ContainerCreating 0 11s <none> game1-nodepool-w-11gc <none> <none>
deployment-nginx-77b4cbf48d-x8xh5 0/1 ContainerCreating 0 11s <none> game1-nodepool-w-11gc <none> <none>
[root@test11 ~]#
3
# 파드 이미지 확인
[root@test11 ~]# kubectl get pod -o yaml | grep "image: nginx"
- image: nginx:1.11
- image: nginx:1.11
- image: nginx:1.11
4
# --record 옵션의 정보 확인
kubectl rollout history deployment deployment-nginx
[root@test11 ~]# kubectl rollout history deployment deployment-nginx
deployment.apps/deployment-nginx
REVISION CHANGE-CAUSE
1 kubectl apply --kubeconfig=/root/kubeconfig.yml --filename=deployment-nginx-1.yaml --record=true
<3> 버전 (롤링) 업데이트 실행 및 확인 :
기존 v1.11 → 업데이트 v1.12 ⇒ 파드 종료와 생성이 어떤 순서대로 되는지 확인!
1
# 터미널2
while true; do kubectl rollout status deployment deployment-nginx && echo "--------------" && date; sleep 1; done
2
# v1.12 로 버전 업데이트 실행
kubectl set image deployment deployment-nginx nginx=nginx:1.12 --record && kubectl get pod -w
kubectl get pod -o yaml | grep "image: nginx"
[root@test11 ~]# kubectl get pod -o yaml | grep "image: nginx"
- image: nginx:1.12
- image: nginx:1.12
- image: nginx:1.1
3
# 한번 더 버전 업데이트
kubectl set image deployment deployment-nginx nginx=nginx:1.13 --record && kubectl get pod -w
kubectl get pod -o yaml | grep "image: nginx"
4
# 마지막으로 한번 더!
kubectl set image deployment deployment-nginx nginx=nginx:1.14 --record && kubectl get pod -w
kubectl get pod -o yaml | grep "image: nginx"
5
# 버전 업데이트 히스토리 확인
kubectl rollout history deployment deployment-nginx
[root@test11 ~]# kubectl rollout history deployment deployment-nginx
deployment.apps/deployment-nginx
REVISION CHANGE-CAUSE
1 kubectl apply --kubeconfig=/root/kubeconfig.yml --filename=deployment-nginx-1.yaml --record=true
2 kubectl set image deployment deployment-nginx nginx=nginx:1.12 --kubeconfig=/root/kubeconfig.yml --record=true
3 kubectl set image deployment deployment-nginx nginx=nginx:1.13 --kubeconfig=/root/kubeconfig.yml --record=true
4 kubectl set image deployment deployment-nginx nginx=nginx:1.14 --kubeconfig=/root/kubeconfig.yml --record=true
<4> 버전 롤백 : 기존 v1.14 → v1.2
1
# 리비전 2로 버전 롤백
kubectl rollout undo deployment deployment-nginx --to-revision=2
kubectl get pod -o yaml | grep "image: nginx"
[root@test11 ~]# kubectl get pod -o yaml | grep "image: nginx"
- image: nginx:1.14
- image: nginx:1.14
- image: nginx:1.14
- image: nginx:1.12
- image: nginx:1.12
- image: nginx:1.12
[root@test11 ~]# kubectl get pod -o yaml | grep "image: nginx"
- image: nginx:1.12
- image: nginx:1.12
- image: nginx:1.12
2
# 어떻게 버전별 롤백이 가능한걸까? 레플리카셋 정보(기록)을 가지고 있으며, Labels 로 구별되어 있다!
kubectl get replicasets.apps --show-labels
[root@test11 ~]# kubectl get replicasets.apps --show-labels
NAME DESIRED CURRENT READY AGE LABELS
deployment-nginx-5cbcc59b4c 0 0 0 94s app=cndk-nginx-pods,pod-template-hash=5cbcc59b4c
deployment-nginx-67cc8cd4f4 0 0 0 111s app=cndk-nginx-pods,pod-template-hash=67cc8cd4f4
deployment-nginx-77b4cbf48d 0 0 0 5m29s app=cndk-nginx-pods,pod-template-hash=77b4cbf48d
deployment-nginx-78bc6dfdf7 3 3 3 3m8s app=cndk-nginx-pods,pod-template-hash=78bc6dfdf7
3
# 디플로이먼트의 상세 정보 확인
kubectl describe deployments.apps deployment-nginx
[root@test11 ~]# kubectl describe deployments.apps deployment-nginx
Name: deployment-nginx
Namespace: default
CreationTimestamp: Thu, 10 Mar 2022 22:48:58 +0900
Labels: <none>
Annotations: deployment.kubernetes.io/revision: 5
kubernetes.io/change-cause: kubectl set image deployment deployment-nginx nginx=nginx:1.12 --kubeconfig=/root/kubeconfig.yml --record=true
Selector: app=cndk-nginx-pods
Replicas: 3 desired | 3 updated | 3 total | 3 available | 0 unavailable
StrategyType: RollingUpdate
MinReadySeconds: 0
RollingUpdateStrategy: 25% max unavailable, 25% max surge
Pod Template:
Labels: app=cndk-nginx-pods
Containers:
nginx:
Image: nginx:1.12
Port: <none>
Host Port: <none>
Environment: <none>
Mounts: <none>
Volumes: <none>
Conditions:
Type Status Reason
---- ------ ------
Available True MinimumReplicasAvailable
Progressing True NewReplicaSetAvailable
OldReplicaSets: <none>
NewReplicaSet: deployment-nginx-78bc6dfdf7 (3/3 replicas created)
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal ScalingReplicaSet 5m51s deployment-controller Scaled up replica set deployment-nginx-77b4cbf48d to 3
Normal ScalingReplicaSet 3m30s deployment-controller Scaled up replica set deployment-nginx-78bc6dfdf7 to 1
Normal ScalingReplicaSet 3m19s deployment-controller Scaled down replica set deployment-nginx-77b4cbf48d to 2
Normal ScalingReplicaSet 3m17s deployment-controller Scaled down replica set deployment-nginx-77b4cbf48d to 1
Normal ScalingReplicaSet 3m17s deployment-controller Scaled up replica set deployment-nginx-78bc6dfdf7 to 3
Normal ScalingReplicaSet 3m15s deployment-controller Scaled down replica set deployment-nginx-77b4cbf48d to 0
Normal ScalingReplicaSet 2m13s deployment-controller Scaled up replica set deployment-nginx-67cc8cd4f4 to 1
Normal ScalingReplicaSet 2m4s deployment-controller Scaled down replica set deployment-nginx-78bc6dfdf7 to 2
Normal ScalingReplicaSet 55s (x2 over 3m19s) deployment-controller Scaled up replica set deployment-nginx-78bc6dfdf7 to 2
Normal ScalingReplicaSet 51s (x15 over 2m4s) deployment-controller (combined from similar events): Scaled down replica set deployment-nginx-5cbcc59b4c to 0
[root@test11 ~]#
4
[root@test11 ~]# kubectl get pod -o yaml | grep "image: nginx"
- image: nginx:1.12
- image: nginx:1.12
- image: nginx:1.12
5
# 다음 실습을 위해 삭제
kubectl delete deployments.apps --all
[root@test11 ~]# k get pods
No resources found in default namespace.
다음 과정
https://brunch.co.kr/@topasvga/2238
https://brunch.co.kr/@topasvga/2240
감사합니다.
