第五阶段
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CLOUD
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课程总结
第五阶段环境
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openstack
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cloud
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docker-01
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ARCHITECTURE
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Hadoop -- 01
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Hadoop -- 02
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Hadoop -- 03
kubectl 命令速查手册
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# kubernetes -- 03 ## 资源控制器 #### daemonset 控制器 ```yaml [root@master ~]# vim mynginx.yaml --- kind: DaemonSet apiVersion: apps/v1 metadata: name: mynginx spec: selector: matchLabels: myapp: nginx template: metadata: labels: myapp: nginx spec: containers: - name: nginxcluster image: 192.168.1.100:5000/myos:nginx stdin: false tty: false ports: - protocol: TCP containerPort: 80 restartPolicy: Always [root@master ~]# kubectl apply -f mynginx.yaml daemonset.apps/mynginx created [root@master ~]# kubectl get pod -o wide NAME READY STATUS RESTARTS AGE IP NODE mynginx-77jtf 1/1 Running 0 6s 10.244.3.9 node-0001 mynginx-cwdzt 1/1 Running 0 6s 10.244.1.9 node-0003 mynginx-z2kl6 1/1 Running 0 6s 10.244.2.10 node-0002 [root@master ~]# ``` #### 污点与容忍 污点策略：NoSchedule、PreferNoSchedule、NoExecute ```shell [root@master ~]# kubectl delete -f mynginx.yaml daemonset.apps "mynginx" deleted [root@master ~]# kubectl describe nodes |grep -P "^Taints" Taints: node-role.kubernetes.io/master:NoSchedule Taints: <none> Taints: <none> Taints: <none> [root@master ~]# kubectl taint node node-0001 k1=v1:NoSchedule node/node-0001 tainted [root@master ~]# kubectl apply -f mynginx.yaml daemonset.apps/mynginx created [root@master ~]# kubectl get pods NAME READY STATUS RESTARTS AGE mynginx-f2rxh 1/1 Running 0 4s mynginx-n7xsw 1/1 Running 0 4s [root@master ~]# kubectl taint node node-0001 k1- node/node-0001 untainted [root@master ~]# kubectl get pods NAME READY STATUS RESTARTS AGE mynginx-f2rxh 1/1 Running 0 105s mynginx-hp6f2 1/1 Running 0 2s mynginx-n7xsw 1/1 Running 0 105s [root@master ~]# ``` 驱逐容器 ```shell [root@master ~]# kubectl apply -f myapache.yaml deployment.apps/myapache created [root@master ~]# kubectl scale deployment myapache --replicas=3 deployment.apps/myapache scaled [root@master ~]# kubectl get pod -o wide NAME READY STATUS RESTARTS AGE IP NODE myapache-7d689bf8f-xq7l6 1/1 Running 0 2m23s 10.244.3.11 node-0001 myapache-7d689bf8f-b4d5f 1/1 Running 0 9s 10.244.2.14 node-0002 myapache-7d689bf8f-mzcgw 1/1 Running 0 9s 10.244.1.13 node-0003 mynginx-hp6f2 1/1 Running 0 5m25s 10.244.3.10 node-0001 mynginx-f2rxh 1/1 Running 0 7m8s 10.244.2.11 node-0002 mynginx-4f7tl 1/1 Running 0 20s 10.244.1.12 node-0003 [root@master ~]# kubectl taint node node-0003 k1=v1:NoExecute node/node-0003 tainted [root@master ~]# kubectl get pod -o wide NAME READY STATUS RESTARTS AGE IP NODE myapache-7d689bf8f-xq7l6 1/1 Running 0 2m23s 10.244.3.11 node-0001 myapache-7d689bf8f-b4d5f 1/1 Running 0 9s 10.244.2.14 node-0002 myapache-7d689bf8f-mzcgw 1/1 Running 0 9s 10.244.2.15 node-0002 mynginx-hp6f2 1/1 Running 0 5m25s 10.244.3.10 node-0001 mynginx-f2rxh 1/1 Running 0 7m8s 10.244.2.11 node-0002 [root@master ~]# kubectl taint node node-0003 k1- node/node-0003 untainted [root@master ~]# kubectl get pod -o wide NAME READY STATUS RESTARTS AGE IP NODE myapache-7d689bf8f-xq7l6 1/1 Running 0 2m23s 10.244.3.11 node-0001 myapache-7d689bf8f-b4d5f 1/1 Running 0 9s 10.244.2.14 node-0002 myapache-7d689bf8f-mzcgw 1/1 Running 0 9s 10.244.2.15 node-0002 mynginx-hp6f2 1/1 Running 0 5m25s 10.244.3.10 node-0001 mynginx-f2rxh 1/1 Running 0 7m8s 10.244.2.11 node-0002 mynginx-9s9z4 1/1 Running 0 34s 10.244.1.14 node-0003 [root@master ~]# ``` #### job/cronjob 控制器 job 资源文件 ```yaml [root@master ~]# vim myjob.yaml --- apiVersion: batch/v1 kind: Job metadata: name: pi spec: template: spec: containers: - name: pi image: 192.168.1.100:5000/myos:v1804 command: ["perl", "-Mbignum=bpi", "-wle", "print bpi(2000)"] restartPolicy: OnFailure [root@master config]# kubectl apply -f myjob.yaml job.batch/pi created [root@master config]# kubectl get job NAME COMPLETIONS DURATION AGE pi 1/1 2s 7s [root@master config]# kubectl get pod NAME READY STATUS RESTARTS AGE pi-gvfwj 0/1 Completed 0 15s # 查看终端结果 [root@master config]# kubectl logs pi-gvfwj ``` cronjob 资源文件 ```yaml [root@master ~]# vim mycronjob.yaml --- apiVersion: batch/v1beta1 kind: CronJob metadata: name: cronjob-pi spec: schedule: "*/1 * * * *" jobTemplate: spec: template: spec: containers: - name: pi image: 192.168.1.100:5000/myos:v1804 command: ["perl", "-Mbignum=bpi", "-wle", "print bpi(2000)"] restartPolicy: OnFailure [root@master ~]# kubectl apply -f mycronjob.yaml cronjob.batch/cronjob-pi created [root@master ~]# kubectl get cronjobs.batch NAME SCHEDULE SUSPEND ACTIVE LAST SCHEDULE AGE cronjob-pi */1 * * * * False 0 <none> 10s [root@master ~]# kubectl get pod NAME READY STATUS RESTARTS AGE cronjob-pi-1595410620-vvztx 0/1 Completed 0 62s ``` ## 集群服务 #### 服务图例  #### ClusterIP服务 ###### 会变化的资源 ```yaml [root@master ~]# kubectl apply -f myapache.yaml deployment.apps/myapache created [root@master ~]# kubectl scale deployment myapache --replicas=2 deployment.apps/myapache scaled [root@master ~]# kubectl get pod -o wide NAME READY STATUS RESTARTS AGE IP NODE myapache-7d689bf8f-c268l 1/1 Running 0 13s 10.244.2.16 node-0002 myapache-7d689bf8f-4z225 1/1 Running 0 5s 10.244.1.15 node-0003 [root@master ~]# kubectl delete pod myapache-7d689bf8f-4z225 pod "myapache-7d689bf8f-4z225" deleted [root@master ~]# kubectl get pod -o wide NAME READY STATUS RESTARTS AGE IP NODE myapache-7d689bf8f-c268l 1/1 Running 0 38s 10.244.2.16 node-0002 myapache-7d689bf8f-mccqv 1/1 Running 0 13s 10.244.3.12 node-0001 [root@master ~]# ``` ###### 创建 ClusterIP 服务 ```yaml [root@master ~]# vim clusterip.yaml --- kind: Service apiVersion: v1 metadata: name: myapache spec: ports: - protocol: TCP port: 80 targetPort: 80 selector: myapp: httpd # 标签必须与 deploy 资源文件中一致 type: ClusterIP [root@master config]# kubectl apply -f clusterip.yaml service/myapache created [root@master config]# kubectl get service NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.254.0.1 <none> 443/TCP 22h myapache ClusterIP 10.254.235.248 <none> 80/TCP 4s ``` ###### 访问服务 服务只有在集群内部才可以访问，创建 Pod，在Pod 中访问服务 ```yaml [root@master ~]# kubectl apply -f mypod.yaml pod/mypod created [root@master ~]# kubectl exec -it mypod -- /bin/bash [root@mypod /]# curl http://10.254.235.248/info.php <pre> Array ( [REMOTE_ADDR] => 10.244.1.16 [REQUEST_METHOD] => GET [HTTP_USER_AGENT] => curl/7.29.0 [REQUEST_URI] => /info.php ) php_host: myapache-7d689bf8f-mccqv 1229 [root@mypod /]# curl http://10.254.235.248/info.php <pre> Array ( [REMOTE_ADDR] => 10.244.1.16 [REQUEST_METHOD] => GET [HTTP_USER_AGENT] => curl/7.29.0 [REQUEST_URI] => /info.php ) php_host: myapache-7d689bf8f-c268l 1229 [root@mypod /]# ``` 扩容集群节点，服务自动扩展 ```shell # 在master上执行扩容节点 [root@master ~]# kubectl scale deployment myapache --replicas=3 # 服务本质是LVS规则 [root@master ~]# ipvsadm -L -n TCP 10.254.235.248:80 rr -> 10.244.1.17:80 Masq 1 0 0 -> 10.244.2.16:80 Masq 1 0 0 -> 10.244.3.12:80 Masq 1 0 0 ----------------------------------------------------------------------------------------- # 在pod里访问 [root@pod-example /]# curl http://10.254.78.148/info.php ... ... php_host: myapache-7d689bf8f-lpt89 ... ... php_host: myapache-7d689bf8f-mccqv ... ... php_host: myapache-7d689bf8f-c268l ``` #### nodeport 服务 ```yaml [root@master ~]# vim mynodeport.yaml --- kind: Service apiVersion: v1 metadata: name: mynodeport spec: ports: - protocol: TCP port: 80 targetPort: 80 selector: myapp: httpd type: NodePort # 指定服务类型 [root@master ~]# kubectl apply -f mynodeport.yaml [root@master ~]# kubectl get service NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE mynodeport NodePort 10.254.105.233 <none> 80:31410/TCP 4s #---------------------------所有node节点31410端口均可访问----------------------------------- # 在跳板机上访问服务 [root@ecs-proxy ~]# curl http://192.168.1.31:31410/info.php [root@ecs-proxy ~]# curl http://192.168.1.32:31410/info.php [root@ecs-proxy ~]# curl http://192.168.1.33:31410/info.php ``` #### headless 服务 ```yaml [root@master ~]# vim myheadless.yaml --- kind: Service apiVersion: v1 metadata: name: myheadless spec: ports: - protocol: TCP port: 80 targetPort: 80 selector: myapp: httpd type: ClusterIP clusterIP: None # 新添加 [root@master ~]# kubectl apply -f myheadless.yaml service/myheadless created [root@master ~]# kubectl get service NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.254.0.1 <none> 443/TCP 22h myapache ClusterIP 10.254.235.248 <none> 80/TCP 7m52s myheadless ClusterIP None <none> 80/TCP 3s #-----------------------------------进入pod查看解析结果------------------------------------ [root@master ~]# kubectl exec -it pod-example -- /bin/bash [root@mypod /]# yum install -y bind-utils [root@mypod /]# host myheadless.default.svc.cluster.local myheadless.default.svc.cluster.local has address 10.244.3.12 myheadless.default.svc.cluster.local has address 10.244.1.17 myheadless.default.svc.cluster.local has address 10.244.2.16 ``` #### ingress ###### 安装控制器 拷贝云盘 kubernetes/v1.17.6/ingress 文件夹到 master 上，导入镜像到私有仓库 ```yaml [root@master ingress]# docker load -i ingress-nginx.tar.gz [root@master ingress]# docker tag quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.30.0 192.168.1.100:5000/nginx-ingress-controller:0.30.0 [root@master ingress]# docker push 192.168.1.100:5000/nginx-ingress-controller:0.30.0 [root@master ingress]# curl http://192.168.1.100:5000/v2/nginx-ingress-controller/tags/list {"name":"nginx-ingress-controller","tags":["0.30.0"]} [root@master ~]# vim ingress/mandatory.yaml 221: image: 192.168.1.100:5000/nginx-ingress-controller:0.30.0 [root@master ~]# kubectl apply -f ingress/mandatory.yaml [root@master ~]# kubectl -n ingress-nginx get pod NAME READY STATUS RESTARTS AGE nginx-ingress-controller-fc6766d7-ptppp 1/1 Running 0 47s [root@master ingress]# ``` ###### 发布服务 ```shell [root@master ingress]# vim ingress-example.yaml --- apiVersion: extensions/v1beta1 kind: Ingress metadata: name: my-web annotations: kubernetes.io/ingress.class: "nginx" spec: backend: serviceName: myapache servicePort: 80 [root@master ingress]# kubectl apply -f ingress-example.yaml [root@master ingress]# kubectl get ingresses NAME HOSTS ADDRESS PORTS AGE my-app * 192.168.1.33 80 3m2s #----------------------- 在跳板机访问测试 ------------------------------------------------- [root@ecs-proxy ~]# curl http://192.168.1.33/info.php <pre> Array ( [REMOTE_ADDR] => 10.244.3.0 [REQUEST_METHOD] => GET [HTTP_USER_AGENT] => curl/7.29.0 [REQUEST_URI] => /info.php ) php_host: apache-example-65fb568b4c-p6mrl 1229 ```
有云转晴
2022年4月12日 22:18
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