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Hioke

Kubernetesの基本的なメモ

Table of Contents

Nodeの確認

協調してPodを動かしているサーバを確認

kubectl get nodes

Podの確認

# PODを確認
kubectl get pod

# すべてのPODを確認
kubectl get pod --all-namespaces

# deploy先を確認
kubectl get pod --output=wide

Podの中身を確認

kubectl describe pod {pod_name}

サービスの確認

kubectl get {service_name}

ロールバック手順

manifest.ymlファイルの作成

manifest.yml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: testpj-deployment
  labels:
    app: testpj-deployment
spec:
  replicas: 2
  selector:
    matchLabels:
      app: testpj-app
  template:
    metadata:
      labels:
        app: testpj-app
    spec:
      containers:
      - name: testpj-app
        image: u01:5000/testpj:0.2
        imagePullPolicy: Always
        ports:
        - name: testpj-app
          containerPort: 4000
          protocol: TCP

manifestを使ってデプロイ

kubectl apply -f manifest.yml
kubectl get pods
kubectl describe pods

kubectl describe podsの結果

Containers:
  testpj-app:
    Container ID:   docker://895d87ba55af981ffcc32ff0dbbb313368308550488a30d90ec554e04a8ca1c4
    Image:          u01:5000/testpj:0.2
    Image ID:       docker-pullable://u01:5000/testpj@sha256:a5b921e2100961431090e67efd2492a071ad49ccf97a0ed82a35f52748eee58e
    Port:           4000/TCP
    Host Port:      0/TCP
    State:          Running
      Started:      Fri, 11 Feb 2022 04:39:31 +0000
    Ready:          True
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-c446w (ro)

イメージの更新

kubectl set image deployments/testpj-deployment testpj-app=u01:5000/testpj:0.3 --record=true

更新結果の確認

Containers:
  testpj-app:
    Container ID:   docker://765403def9740b8ec88d4c1f0a1e5c8648751c53aa4850ea8cc925ec133d752b
    Image:          u01:5000/testpj:0.3
    Image ID:       docker-pullable://u01:5000/testpj@sha256:52c00bbd3fa700ef8d63232b8687f923e90e7d10080cc00bc2eb63e5fdc0e8bf
    Port:           4000/TCP
    Host Port:      0/TCP
    State:          Running
      Started:      Fri, 11 Feb 2022 04:41:29 +0000
    Ready:          True
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-fnbxt (ro)

更新履歴の確認

kubectl rollout history deployment.apps/testpj-deployment

deployment.apps/testpj-deployment
REVISION  CHANGE-CAUSE
4         <none>
9         <none>
11        kubectl set image deployments/testpj-deployment testpj-app=u01:5000/testpj:0.3 --record=true
12        kubectl set image deployments/testpj-deployment testpj-app=u01:5000/testpj:0.3 --record=true

ロールバック

kubectl rollout undo deployment.app/testpj-deployment

メモ

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