kubernetes集群编排——控制器

集群编排——控制器"/>

kubernetes集群编排——控制器

控制器

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replicaset

vim rs-example.yml

apiVersion: apps/v1
kind: ReplicaSet
metadata:name: replicaset-example
spec:replicas: 3selector:matchLabels:app: nginxtemplate:metadata:labels:app: nginxspec:containers:- name: nginximage: nginx

kubectl apply -f rs-example.yml
kubectl get pod --show-labels

replicaset是通过标签匹配pod

kubectl label pod replicaset-example-w9z28 app=myapp --overwritekubectl get pod --show-labels

kubectl label pod replicaset-example-w9z28 app=nginx --overwritekubectl get pod --show-labels

replicaset自动控制副本数量，pod可以自愈

kubectl delete pod replicaset-example-q2sq9kubectl get pod --show-labels

回收资源

kubectl delete -f rs-example.yml

deployment

vim deployment-example.yaml

apiVersion: apps/v1
kind: Deployment
metadata:name: deployment-example
spec:replicas: 3selector:matchLabels:app: myapptemplate:metadata:labels:app: myappspec:containers:- name: myappimage: myapp:v1

kubectl apply -f deployment-example.yaml
kubectl get all

版本迭代

vim deployment-example.yaml

apiVersion: apps/v1
kind: Deployment
metadata:name: deployment-example
spec:replicas: 3selector:matchLabels:app: myapptemplate:metadata:labels:app: myappspec:containers:- name: myappimage: myapp:v2

kubectl apply -f deployment-example.yaml
kubectl get all

replicaset就是deployment的一个版本

回滚

vim deployment-example.yaml

apiVersion: apps/v1
kind: Deployment
metadata:name: deployment-example
spec:replicas: 3selector:matchLabels:app: myapptemplate:metadata:labels:app: myappspec:containers:- name: myappimage: myapp:v1

kubectl apply -f deployment-example.yaml
kubectl get all

滚动更新策略

vim deployment-example.yaml

apiVersion: apps/v1
kind: Deployment
metadata:name: deployment-example
spec:minReadySeconds: 5				strategy:rollingUpdate:maxSurge: 1maxUnavailable: 0replicas: 3selector:matchLabels:app: myapptemplate:metadata:labels:app: myappspec:containers:- name: myappimage: myapp:v1

kubectl apply -f deployment-example.yamlkubectl describe deployments.apps deployment-example

暂停与恢复

暂停，避免触发不必要的线上更新

kubectl rollout pause deployment deployment-example

vim deployment-example.yaml

apiVersion: apps/v1
kind: Deployment
metadata:name: deployment-example
spec:minReadySeconds: 5strategy:rollingUpdate:maxSurge: 1maxUnavailable: 0replicas: 6				selector:matchLabels:app: myapptemplate:metadata:labels:app: myappspec:containers:- name: myappimage: nginxresources:limits:cpu: 0.5memory: 200Mirequests:cpu: 0.5memory: 200Mi

kubectl apply -f deployment-example.yaml
kubectl get all

调整副本数，不受影响

但是更新镜像和修改资源并没有触发更新

kubectl rollout history deployment deployment-example

恢复后开始触发更新

kubectl rollout resume deployment deployment-examplekubectl rollout history  deployment deployment-example

kubectl get pod

回收

kubectl delete -f deployment-example.yaml

daemonset

vim daemonset-example.yml

apiVersion: apps/v1
kind: DaemonSet
metadata:name: daemonset-example
spec:selector:matchLabels:app: nginxtemplate:metadata:labels:app: nginxspec:tolerations:- effect: NoScheduleoperator: Existscontainers:- name: nginximage: nginx

kubectl apply -f daemonset-example.ymlkubectl get pod -o wide

kubectl delete -f daemonset-example.yml

job

vim job.yml

apiVersion: batch/v1kind: Jobmetadata:name: pispec:completions: 6parallelism: 2template:spec:containers:- name: piimage: perl:5.34.0command: ["perl",  "-Mbignum=bpi", "-wle", "print bpi(2000)"]restartPolicy: NeverbackoffLimit: 4

kubectl apply -f job.ymlkubectl get pod

kubectl delete -f job.yml

cronjob

vim cronjob.yml

apiVersion: batch/v1kind: CronJobmetadata:name: hellospec:schedule: "* * * * *"jobTemplate:spec:template:spec:containers:- name: helloimage: busyboximagePullPolicy: IfNotPresentcommand:- /bin/sh- -c- date; echo Hello from the Kubernetes clusterrestartPolicy: OnFailure

kubectl apply -f cronjob.ymlkubectl get all

kubectl delete -f cronjob.yml