Replication Controller, ReplicaSet

Template, Replicas, Selector
강의자료 PDF
Controller with Replicastion Controller, ReplicaSet for Kubernetes.


1. Template, Replicas

Controller with Replication, ReplicaSet for Kubernetes.

1-1) Pod

apiVersion: v1
kind: Pod
metadata:
  name: pod1
  labels:
    type: web
spec:
  containers:
  - name: container
    image: kubetm/app:v1
  terminationGracePeriodSeconds: 0

1-2) ReplicaSet

apiVersion: apps/v1
kind: ReplicaSet
metadata:
  name: replica1
spec:
  replicas: 1
  selector:
    matchLabels:
      type: web
  template:
    metadata:
      name: pod1
      labels:
        type: web
    spec:
      containers:
      - name: container
        image: kubetm/app:v1
      terminationGracePeriodSeconds: 0


2. Updating Controller

ReplicationController -> ReplicaSet

ReplicationController

apiVersion: v1
kind: ReplicationController
metadata:
  name: replication1
spec:
  replicas: 2
  selector:
    cascade: "false"
  template:
    metadata:
      labels:
        cascade: "false"
    spec:
      containers:
      - name: container
        image: kubetm/app:v1

kubectl

kubectl delete replicationcontrollers replication1 --cascade=false

ReplicaSet

apiVersion: apps/v1
kind: ReplicaSet
metadata:
  name: replica2
spec:
  replicas: 2
  selector:
    matchLabels:
      cascade: "false"
  template:
    metadata:
      labels:
        cascade: "false"
    spec:
      containers:
      - name: container
        image: kubetm/app:v1


3. Selector

Match with Replication, ReplicaSet for Kubernetes.

3-1) ReplicaSet

apiVersion: apps/v1
kind: ReplicaSet
metadata:
  name: replica1
spec:
  replicas: 1
  selector:
    matchLabels:
      type: web
      ver: v1
    matchExpressions:
    - {key: type, operator: In, values: [web]}
    - {key: ver, operator: Exists}
  template:
    metadata:
      labels:
        type: web
        ver: v1
        location: dev
    spec:
      containers:
      - name: container
        image: kubetm/app:v1
      terminationGracePeriodSeconds: 0


Pod

apiVersion: v1
kind: Pod
metadata:
  name: pod-node-affinity1
spec:
  affinity:
    nodeAffinity:
      requiredDuringSchedulingIngnoredDuringExecution:
        nodeSelectorTerms:
        - matchExpressions:
  	       - {key: AZ-01, operator: Exists}
  containers:
  - name: container
    image: kubetm/init

Tip

MatchExpressions

Match2 with Replication, ReplicaSet for Kubernetes.


Referenece

Kubernetes