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

10 롤링업데이트.txt

<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

117. 네임 스페이스 이해 7/8

https://brunch.co.kr/@topasvga/2240

119. (몰아보기) 네이버 클라우드로 쿠버네티스 공부

감사합니다.