Kubenetes控制器

一.Replicaset控制器1.建立控制器[rootmaster controler]# kubectl create deployment webcluster --image myapp:v1 --dry-runclient -o yaml repset.yml ​ [rootmaster controler]# vim repset.yml apiVersion: apps/v1 kind: ReplicaSet metadata: labels: app: webcluster name: webcluster spec: replicas: 2 selector: matchLabels: app: webcluster # strategy: {} template: metadata: labels: app: webcluster spec: containers: - image: myapp:v1 name: myapp ​ [rootmaster controler]# kubectl apply -f repset.yml ​ #打开一个新的shell [rootmaster ~]# watch -n 1 kubectl get pods --show-labels Every 1.0s: kubectl get pods --show-labels master: Sat Apr 11 10:08:32 2026 ​ NAME READY STATUS RESTARTS AGE LABELS webcluster-tbxq4 1/1 Running 0 6m49s appwebcluster webcluster-jna23 1/1 Running 0 6m49s appwebcluster ​ #拉伸 kubectl scale replicaset webcluster --replicas 4 kubectl scale replicaset webcluster --replicas 2 kubectl scale replicaset webcluster --replicas 0​2.测试功能[rootmaster controler]# vim repset.yml 。。。。 spec: replicas: 4 。。。。 ​ [rootmaster controler]# kubectl apply -f repset.yml ​ [rootmaster ~]# watch -n 1 kubectl get pods --show-labels Every 1.0s: kubectl get pods --show-labels master: Sat Apr 11 10:11:06 2026 ​ NAME READY STATUS RESTARTS AGE LABELS webcluster-4sxz4 1/1 Running 0 13s appwebcluster webcluster-lvtsn 1/1 Running 0 13s appwebcluster webcluster-tbxq4 1/1 Running 0 9m23s appwebcluster webcluster-tr5qk 1/1 Running 0 13s appwebcluster二.deployment1.监控[rootmaster ~]# watch -n 1 kubectl get pods --show-labels;echo ;kubectl get replicasets.apps2.建立deployment控制器[rootmaster controler]# kubectl create deployment webcluster --image myapp:v1 --dry-runclient -o yaml dep.yml [rootmaster controler]# vim dep.yml apiVersion: apps/v1 kind: Deployment metadata: labels: app: webcluster name: webcluster spec: minReadySeconds: 5 replicas: 2 selector: matchLabels: app: webcluster # strategy: {} template: metadata: labels: app: webcluster spec: containers: - image: myapp:v1 name: myapp # resources: {} ​ [rootmaster controler]# kubectl apply -f dep.yml ​ #监控部分显示效果 Every 1.0s: kubectl get pods --show-labels;echo ;kubectl get replicase... master: Sat Apr 11 10:43:24 2026 ​ NAME READY STATUS RESTARTS AGE LABELS webcluster-77c87d9946-49kh5 1/1 Running 0 45s appwebcluster,pod-template-hash77c87d9946 webcluster-77c87d9946-m2x2d 1/1 Running 0 45s appwebcluster,pod-template-hash77c87d9946 NAME DESIRED CURRENT READY AGE webcluster-77c87d9946 2 2 2 45s ​ ​ #发布服务 [rootmaster controler]# kubectl expose deployment webcluster --port 80 --target-port 80 [rootmaster controler]# kubectl describe services webcluster Name: webcluster Namespace: default Labels: appwebcluster Annotations: none Selector: appwebcluster Type: ClusterIP IP Family Policy: SingleStack IP Families: IPv4 IP: 10.107.142.60 IPs: 10.107.142.60 Port: unset 80/TCP TargetPort: 80/TCP Endpoints: 10.244.2.6:80,10.244.1.9:80 Session Affinity: None Internal Traffic Policy: Cluster Events: none ​ #访问 [rootmaster controler]# curl 10.107.142.60 Hello MyApp | Version: v1 | a hrefhostname.htmlPod Name/a3.升级和回滚#升级 [rootmaster controler]# vim dep.yml 。。。。 spec: minReadySeconds: 5 replicas: 2 selector: matchLabels: app: webcluster # strategy: {} template: metadata: labels: app: webcluster spec: containers: - image: myapp:v2 #升级为版本2 name: myapp 。。。。 [rootmaster controler]# kubectl apply -f dep.yml deployment.apps/webcluster configured [rootmaster controler]# curl 10.107.142.60 Hello MyApp | Version: v2 | a hrefhostname.htmlPod Name/a ​ #回滚 [rootmaster controler]# vim dep.yml 。。。。 spec: minReadySeconds: 5 replicas: 2 selector: matchLabels: app: webcluster # strategy: {} template: metadata: labels: app: webcluster spec: containers: - image: myapp:v1 #回滚为版本1 name: myapp 。。。。 [rootmaster controler]# kubectl apply -f dep.yml [rootmaster controler]# curl 10.107.142.60 Hello MyApp | Version: v1 | a hrefhostname.htmlPod Name/a ​三.版本更新管理及优化[rootmaster controler]# vim dep.yml spec: minReadySeconds: 5 replicas: 6 #把pod数量设定为6方便观察 selector: ​ [rootmaster controler]# kubectl apply -f dep.yml deployment.apps/webcluster configured1.查看更新策略信息[rootmaster controler]# kubectl describe deployments.apps webcluster RollingUpdateStrategy: 25% max unavailable, 25% max surge ​2.设定更新策略[rootmaster controler]# vim dep.yml spec: minReadySeconds: 5 replicas: 6 selector: matchLabels: app: webcluster strategy: rollingUpdate: maxSurge: 1 #更新时pod数量最多比期望值多一个 maxUnavailable: 0 #不能使用pod数量比期望值数量多0 template: metadata: labels: app: webcluster spec: containers: - image: myapp:v1 name: myapp ​ ​ [rootmaster controler]# kubectl apply -f dep.yml3.更新暂停和恢复[rootmaster controler]# kubectl rollout history deployment webcluster deployment.apps/webcluster REVISION CHANGE-CAUSE 7 none 8 none ​ [rootmaster controler]# kubectl rollout pause deployment webcluster #暂停更新 deployment.apps/webcluster paused [rootmaster controler]# vim dep.yml 。。。 containers: - image: myapp:v2 name: myapp 。。。 ​ [rootmaster controler]# kubectl apply -f dep.yml #执行成功。但更新过程在监控中没出现 deployment.apps/webcluster configured ​ ​ [rootmaster controler]# kubectl rollout history deployment webcluster deployment.apps/webcluster REVISION CHANGE-CAUSE 7 none 8 none ​ [rootmaster controler]# kubectl rollout resume deployment webcluster #开启更新 deployment.apps/webcluster resumed ​ [rootmaster controler]# kubectl rollout history deployment webcluster deployment.apps/webcluster REVISION CHANGE-CAUSE 8 none 9 none四.DaemonSet[rootmaster controler]# kubectl create deployment daemonset --image myapp:v1 --dry-runclient -o yaml daemonset.yml [rootmaster controler]# vim daemonset.yml apiVersion: apps/v1 kind: DaemonSet metadata: labels: app: daemonset name: daemonset spec: selector: matchLabels: app: daemonset template: metadata: labels: app: daemonset spec: containers: - image: myapp:v1 name: myapp ​ ​ ​ #另外开启一个主机node3并设定在初始化集群时的所有设定确保所有服务的开启 #在master中重新生成集群主机注册时需要的token [rootmaster controler]# kubeadm token create --print-join-command kubeadm join 172.25.254.100:6443 --token lqcz14.6f4krq91w75h58bt --discovery-token-ca-cert-hash sha256:6b5950ef2cdba85d6dfdb564ee90d4187fa3d341767dc9852cbdd5c9dee4f927 ​ ​ [rootnode3 ~]# kubeadm join 172.25.254.100:6443 --token lqcz14.6f4krq91w75h58bt --discovery-token-ca-cert-hash sha256:6b5950ef2cdba85d6dfdb564ee90d4187fa3d341767dc9852cbdd5c9dee4f927 --cri-socket unix:///var/run/cri-dockerd.sock ​ #当node3加入集群后会在node3中立即群星指定的pod其原因是因为运行了daemonset #可以在master中观察pod的状态五.Job控制器[rootmaster ~]# docker load -i perl-5.34.tar.gz [rootmaster ~]# docker tag perl:5.34.0 reg.timinglee.org/library/perl:5.34.0 [rootmaster ~]# docker login reg.timinglee.org -u admin Password: Login Succeeded [rootmaster ~]# docker push reg.timinglee.org/library/perl:5.34.0 ​ [rootmaster controler]# kubectl create job job --image perl:5.34.0 --dry-runclient -o yaml job.yml [rootmaster controler]# vim job.yml apiVersion: batch/v1 kind: Job metadata: name: testjob spec: completions: 6 parallelism: 2 backoffLimit: 4 template: spec: containers: - image: busybox name: testjob command: [/bin/sh, -c] args: - | echo this is testjob message sleep 10 restartPolicy: Never ​ ​ [rootmaster controler]# kubectl apply -f job.yml job.batch/job created ​ [rootk8s-master controller]# kubectl logs pods/testjob-4cdlr this is testjob message六.Cronjob控制器[rootmaster controler]# kubectl create cronjob cronjob --image busybox --schedule * * * * * --dry-runclient -o yaml cronjob.yml [rootmaster controler]# vim cronjob.yml apiVersion: batch/v1 kind: CronJob metadata: name: cronjob spec: jobTemplate: metadata: name: cronjob spec: template: spec: containers: - image: busybox name: cronjob command: - /bin/sh - -c - echo hello timinglee restartPolicy: OnFailure schedule: * * * * * ​ [rootmaster controler]# kubectl apply -f cronjob.yml #整分运行 ​ [rootmaster controler]# kubectl get cronjobs.batch NAME SCHEDULE TIMEZONE SUSPEND ACTIVE LAST SCHEDULE AGE cronjob * * * * * none False 0 17s 70s ​ [rootmaster controler]# kubectl logs cronjob-29598241-pxggh hello timinglee ​