Strategy

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# Deployment
spec:
  strategy:
    type: Recreate/RollingUpdate
    # type=RollingUpdate
    rollingUpdate:
      maxUnavailable: 25%
      maxSurge: 25%

Rollout

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# Current status
kubectl rollout status deploy/my-deploy
# History
kubectl rollout history ...
# Rollback
kubectl rollout undo ...
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# Easily set image
kubectl set image deploy/my-deploy nginx=nginx:1.9.1

Command & Arguments

  • Ex. the sleeper image

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    FROM Ubuntu
    ENTRYPOINT [ "sleep" ]
    CMD [ "5" ]

  • pass arguments

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    # For docker command
    docker run --name sleeper sleeper 10
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# For kubernetes
# Ex. Pod
spec:
  containers:
  - args: [ "10" ]
  • Overwrite entrypoint
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    # For docker command
    docker run --name sleeper sleeper --entrypoint sleep 10
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# For kubernetes
# Ex. Pod
spec:
  containers:
  - command: [ "sleep" ]
    args: [ "10" ]

Environment Variables

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# Ex. Pod
spec:
  containers:
  - env:
    - name: name
      value: value

ConfigMaps

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# Create
kubectl create configMap my-cm --from-literal=key=value
kubectl create configMap my-cm --from-file=path
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# Create
apiVersion: v1
kind: ConfigMap
metadata:
  name: my-config-map
data:
  key1: value1
  key2: value2
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# Usage: Ex. Pod
spec:
  containers:
  - env:
    - name: key1
      valueFrom:
        configMapKeyRef:
          name: my-config-map
          key: key1
    # Or
    envFrom:
    - configMapRef:
        name: my-config-map
  # Or
  volumes:
  - name: my-volume
    configMap:
      name: my-config-map

Secret

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# Create
kubectl create secret generic my-secret --from-literal=key=value
kubectl create secret generic my-secret --from-file=path
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apiVersion: v1
kind: Secret
metadata:
  name: my-secret
data:
  key1: base64-value1
  key2: base64-value2
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# Usage: Ex. Pod
spec:
  containers:
  - env:
    - name: key1
      valueFrom:
        secretKeyRef:
          name: my-secret
          key: key1
    # Or
    envFrom:
    - secretRef:
        name: my-secret
  # Or
  volumes:
  - name: my-volume
    secret:
      secretName: my-config-map

Init Containers

  • Containers that only run at init phase
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    # Ex. Pod
    spec:
      initContainers:
      - name: xxx
        image: xxx
      containers:
      - name: xxx
        image: xxx