創(chuàng)建ReplicaSet

ReplicaSet的配置如下

apiVersion: apps/v1

kind: ReplicaSet

metadata:

name: myapp

namespace: default

spec:

replicas: 2

selector:

matchLabels:

app: myapp

release: canary

template:

metadata:

name: myapp-pod

labels:

app: myapp

release: canary

environment: qa

spec:

containers:

- name: myapp-container

image: ikubernetes/myapp:v1

ports:

- name: http

containerPort: 80

在這個(gè)ReplicaSet中，我們設(shè)置了兩個(gè)label，app=myapp, release=canary , 創(chuàng)建rs后，查看

[root@master manifests]# kubectl create -f rs-demo.yaml --dry-run

replicaset.apps/myapp created (dry run)

[root@master manifests]# kubectl create -f rs-demo.yaml

replicaset.apps/myapp created

[root@master manifests]# kubectl get pods

NAME READY STATUS RESTARTS AGE

myapp-bj795 1/1 Running 0 18s

myapp-blmx8 1/1 Running 0 18s

[root@master manifests]# vim rs-demo.yaml

[root@master manifests]# kubectl get pods --show-labels

NAME READY STATUS RESTARTS AGE LABELS

myapp-b8sb5 1/1 Running 0 5m app=myapp,environment=qa,release=canary

myapp-blmx8 1/1 Running 0 8m app=myapp,environment=qa,release=canary

[root@master manifests]# kubectl get rs

NAME DESIRED CURRENT READY AGE

myapp 2 2 2 39s

實(shí)驗(yàn)

ReplicaSet會(huì)通過label app=myapp, release=canary 來篩選Pod，并且設(shè)定的符合該label的Pod副本應(yīng)該為2個(gè)。

pod-demo.yaml文件的內(nèi)容如下:

apiVersion: v1

kind: Pod

metadata:

name: pod-demo

namespace: default

labels:

app: myapp

tier: frontend

spec:

containers:

- name: myapp

image: ikubernetes/myapp:v1

ports:

- name: http

containerPort: 80

- name: https

containerPort: 443

- name: busybox

image: busybox:latest

#ImagePullPolicy: IfNotPresent

command:

- "/bin/sh"

- "-c"

- "sleep 3600"

此時(shí)，我們創(chuàng)建另一個(gè)pod

[root@master manifests]# kubectl create -f pod-demo.yaml

pod/pod-demo created

[root@master manifests]# kubectl get pods --show-labels

NAME READY STATUS RESTARTS AGE LABELS

myapp-b8sb5 1/1 Running 0 5m app=myapp,environment=qa,release=canary

myapp-blmx8 1/1 Running 0 7m app=myapp,environment=qa,release=canary

pod-demo 2/2 Running 0 11s app=myapp,tier=frontend

可以看到，pod-demo的label為 app=myapp,tier=frontend ，我們嘗試給pod-demo添加一個(gè)label release=canary ，看下會(huì)出現(xiàn)什么效果。

[root@master manifests]# kubectl label pods pod-demo release=canary

pod/pod-demo labeled

[root@master manifests]# kubectl get pods --show-labels

NAME READY STATUS RESTARTS AGE LABELS

myapp-b8sb5 1/1 Running 0 5m app=myapp,environment=qa,release=canary

myapp-blmx8 1/1 Running 0 8m app=myapp,environment=qa,release=canary

pod-demo 2/2 Terminating 0 34s app=myapp,release=canary,tier=frontend

可以發(fā)現(xiàn)： pod-demo的狀態(tài)已經(jīng)為 Terminating。 說明ReplicaSet通過標(biāo)簽選擇器獲取到了三個(gè)副本，然后預(yù)期的副本數(shù)被設(shè)定為2，它隨機(jī)殺掉了一個(gè)。

應(yīng)該是隨機(jī)的， 不過，我測試了幾次，都是把新建的pod-demo殺掉了。

總結(jié)

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