Contents

Kubernetes ReplicaSet

CozyFex included in kubernetes k8s orchestration

2021-05-08 179 words One minute

Contents

You must know

selector is to find the matched labels for managing the PODs in the ReplicaSet.

YAML - rs-definition.yml

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
apiVersion: apps/v1
kind: ReplicaSet
metadata: # -> ReplicaSet
  name: myapp-replicaset
  labels:
    app: myapp
    type: front-end
spec: # -> ReplicaSet
  template:
    metadata: # -> POD
      name: myapp-pod
      labels:
        app: myapp
        type: front-end
    spec: # -> POD
      containers:
        - name: nginx-continer
          image: nginx
  replicas: 3
  selector: # -> `selector` is not required by Replication Controller
    matchLabels:
      type: front-end

Create a ReplicaSet

1
kubectl create -f rs-definition.yml

Show ReplicaSet List

1
kubectl get replicaset

Show ReplicaSet Detail

1
kubectl describe replicaset myapp-replicaset

Change Running ReplicaSet

1
kubectl edit replicaset myapp-replicaset

Delete ReplicaSet

1
kubectl delete replicaset myapp-replicaset

Scale

Change `replicas` in the YAML file with `replace`

1
kubectl replace -f rs-definition.yml

Origin YAML file and `--replicas` option with `scale`

1
kubectl scale --replicas=6 -f rs-definition.yml

Change Running ReplicaSet’s name and `--replicas` option with `scale`

1
kubectl scale --replicas=6 replicaset myapp-replicaset