标签：probe net 启动 spro assign ase head 理念 rac
pod和容器的区别就是，一个pod可以有多个容器，当一个pod只有一个容器的时候，访问pod就是访问容器，对于一个kubernets来说，一个pods至少有两个容器，一个是不可见的，称为pause容器，另一个就是业务容器
pod是一个逻辑概念，pod中的一个容器异常，整个pod重新创建
[root@docker-server1 namespace]# cd ../
[root@docker-server1 yamls]# mkdir pods
[root@docker-server1 yamls]# cd pods
[root@docker-server1 pods]# vi nginx-pods.yaml
apiVersion: v1 kind: Pod metadata: name: nginx labels: app: nginx annotations: test: this is a test app spec: #资源描述信息 containers: - name: nginx image: nginx ports: - containerPort: 80
这是一个最简单的pods，只是运行一个nginx的业务，没有任何其他的东西
[root@docker-server1 pods]# kubectl apply -f nginx-pods.yaml
由于没有指定ns，所以pods运行在defaults中，查看
[root@docker-server1 pods]# kubectl get pods
NAME READY STATUS RESTARTS AGE nginx 1/1 Running 0 85s
1/1：后面的1表示这个pods运行了几个容器，前面的1表示几个容器处于redy状态
查看容器
[root@docker-server1 pods]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES nginx 1/1 Running 0 6m41s 10.244.2.6 192.168.132.133 <none> <none>
访问
[root@docker-server1 pods]# curl http://10.244.2.6
<!DOCTYPE html> <html> <head> <title>Welcome to nginx!</title> <style> body { width: 35em; margin: 0 auto; font-family: Tahoma, Verdana, Arial, sans-serif; } </style> </head> <body> <h1>Welcome to nginx!</h1> <p>If you see this page, the nginx web server is successfully installed and working. Further configuration is required.</p> <p>For online documentation and support please refer to <a href="http://nginx.org/">nginx.org</a>.<br/> Commercial support is available at <a href="http://nginx.com/">nginx.com</a>.</p> <p><em>Thank you for using nginx.</em></p> </body> </html>
[root@docker-server1 pods]# vim nginx-pods.yaml
apiVersion: v1 kind: Pod metadata: name: nginx labels: app: nginx spec: hostNetwork: true containers: - name: nginx image: nginx ports: - containerPort: 80
[root@docker-server1 pods]# kubectl delete -f nginx-pods.yaml
[root@docker-server1 pods]# kubectl create -f nginx-pods.yaml
[root@docker-server1 pods]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES nginx 0/1 ContainerCreating 0 4s 192.168.132.133 192.168.132.133 <none> <none>
[root@docker-server1 pods]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES nginx 1/1 Running 0 95s 192.168.132.133 192.168.132.133 <none> <none>
name: string image: string imagePullPolicy: [Always |Never | IfNotPresent] #拉取镜像策略，默认是第三种，先看本地，本地没有，才拉取 restartPolicy: [Always | Never | OnFailure] command: [string] args: [string] ports: containerPort: int hostPort: int protocol: string env: name: string value: string hostNetwork: bool resources volumes livenessProbe ReadnessProbe
运行多个容器，并使用拉取镜像策略
[root@docker-server1 pods]# vim nginx-pods.yaml
apiVersion: v1 kind: Pod metadata: name: nginx labels: app: nginx annotations: test: this is a test app spec: imagePullPolicy: Always restartPolicy: Always containers: - name: nginx image: nginx ports: - containerPort: 80 hostPost: 8080 env: - name: test value: aaa - name: test1 value: bbb - name: busybox image: busybox command: - sh - -c - sleep 3600
[root@docker-server1 pods]# kubectl delete pod nginx
[root@docker-server1 pods]# kubectl create -f nginx-pods.yaml
error: error validating "nginx-pods.yaml": error validating data: ValidationError(Pod.spec): unknown field "imagePullPolicy" in io.k8s.api.core.v1.PodSpec; if you choose to ignore these errors, turn validation off with --validate=false
imagePullPolicy这个不能指定所有容器
[root@docker-server1 pods]# vim nginx-pods.yaml
apiVersion: v1 kind: Pod metadata: name: nginx labels: app: nginx annotations: test: this is a test app spec: restartPolicy: Always containers: - name: nginx image: nginx imagePullPolicy: Always ports: - containerPort: 80 hostPort: 8080 env: - name: test value: aaa - name: test1 value: bbb - name: busybox image: busybox command: - sh - -c - sleep 3600
[root@docker-server1 pods]# kubectl create -f nginx-pods.yaml
[root@docker-server1 pods]# kubectl get pods
NAME READY STATUS RESTARTS AGE nginx 2/2 Running 0 28s
[root@docker-server1 pods]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES nginx 2/2 Running 0 36s 10.244.2.7 192.168.132.133 <none> <none>
做了端口映射，两种方式访问
[root@docker-server1 pods]# curl http://192.168.132.133:8080
[root@docker-server1 pods]# curl http://10.244.2.7
[root@docker-server1 pods]# kubectl describe po nginx
Name: nginx Namespace: default Priority: 0 Node: 192.168.132.133/192.168.132.133 Start Time: Thu, 09 Jan 2020 18:17:48 -0500 Labels: app=nginx Annotations: test: this is a test app Status: Running IP: 10.244.2.7 IPs: IP: 10.244.2.7 Containers: nginx: Container ID: docker://676a2d9bebda40d86138190093d1a6d6cf6f16e5ff0e89fc22df53a74bdf8048 Image: nginx Image ID: docker-pullable://nginx@sha256:8aa7f6a9585d908a63e5e418dc5d14ae7467d2e36e1ab4f0d8f9d059a3d071ce Port: 80/TCP Host Port: 8080/TCP State: Running Started: Thu, 09 Jan 2020 18:17:55 -0500 Ready: True Restart Count: 0 Environment: test: aaa test1: bbb Mounts: /var/run/secrets/kubernetes.io/serviceaccount from default-token-bwbrn (ro) busybox: Container ID: docker://e8cc006f3ab292701d9876d84881af90f4c97ea22f32bf0cabf2b93d82b8c82b Image: busybox Image ID: docker-pullable://busybox@sha256:6915be4043561d64e0ab0f8f098dc2ac48e077fe23f488ac24b665166898115a Port: <none> Host Port: <none> Command: sh -c sleep 3600 State: Running Started: Thu, 09 Jan 2020 18:18:00 -0500 Ready: True Restart Count: 0 Environment: <none> Mounts: /var/run/secrets/kubernetes.io/serviceaccount from default-token-bwbrn (ro) Conditions: Type Status Initialized True Ready True ContainersReady True PodScheduled True Volumes: default-token-bwbrn: Type: Secret (a volume populated by a Secret) SecretName: default-token-bwbrn Optional: false QoS Class: BestEffort Node-Selectors: <none> Tolerations: node.kubernetes.io/not-ready:NoExecute for 300s node.kubernetes.io/unreachable:NoExecute for 300s Events: Type Reason Age From Message ---- ------ ---- ---- ------- Normal Pulling 4m43s kubelet, 192.168.132.133 Pulling image "nginx" Normal Scheduled 4m41s default-scheduler Successfully assigned default/nginx to 192.168.132.133 Normal Pulled 4m38s kubelet, 192.168.132.133 Successfully pulled image "nginx" Normal Created 4m37s kubelet, 192.168.132.133 Created container nginx Normal Started 4m37s kubelet, 192.168.132.133 Started container nginx Normal Pulling 4m37s kubelet, 192.168.132.133 Pulling image "busybox" Normal Pulled 4m32s kubelet, 192.168.132.133 Successfully pulled image "busybox" Normal Created 4m32s kubelet, 192.168.132.133 Created container busybox Normal Started 4m32s kubelet, 192.168.132.133 Started container busybox
如果不小心删除了yaml文件，可以通过描述信息找回
[root@docker-server1 pods]# rm -rf nginx-pods.yaml
[root@docker-server1 pods]# kubectl get pods nginx -o yaml
apiVersion: v1 kind: Pod metadata: annotations: test: this is a test app creationTimestamp: "2020-01-09T23:17:51Z" labels: app: nginx name: nginx namespace: default resourceVersion: "43864" selfLink: /api/v1/namespaces/default/pods/nginx uid: 41510342-de97-4b37-ab95-0a01dd73aac7 spec: containers: - env: - name: test value: aaa - name: test1 value: bbb image: nginx imagePullPolicy: Always name: nginx ports: - containerPort: 80 hostPort: 8080 protocol: TCP resources: {} terminationMessagePath: /dev/termination-log terminationMessagePolicy: File volumeMounts: - mountPath: /var/run/secrets/kubernetes.io/serviceaccount name: default-token-bwbrn readOnly: true - command: - sh - -c - sleep 3600 image: busybox imagePullPolicy: Always name: busybox resources: {} terminationMessagePath: /dev/termination-log terminationMessagePolicy: File volumeMounts: - mountPath: /var/run/secrets/kubernetes.io/serviceaccount name: default-token-bwbrn readOnly: true dnsPolicy: ClusterFirst enableServiceLinks: true nodeName: 192.168.132.133 priority: 0 restartPolicy: Always schedulerName: default-scheduler securityContext: {} serviceAccount: default serviceAccountName: default terminationGracePeriodSeconds: 30 tolerations: - effect: NoExecute key: node.kubernetes.io/not-ready operator: Exists tolerationSeconds: 300 - effect: NoExecute key: node.kubernetes.io/unreachable operator: Exists tolerationSeconds: 300 volumes: - name: default-token-bwbrn secret: defaultMode: 420 secretName: default-token-bwbrn status: conditions: - lastProbeTime: null lastTransitionTime: "2020-01-09T23:17:48Z" status: "True" type: Initialized - lastProbeTime: null lastTransitionTime: "2020-01-09T23:18:01Z" status: "True" type: Ready - lastProbeTime: null lastTransitionTime: "2020-01-09T23:18:01Z" status: "True" type: ContainersReady - lastProbeTime: null lastTransitionTime: "2020-01-09T23:17:51Z" status: "True" type: PodScheduled containerStatuses: - containerID: docker://e8cc006f3ab292701d9876d84881af90f4c97ea22f32bf0cabf2b93d82b8c82b image: busybox:latest imageID: docker-pullable://busybox@sha256:6915be4043561d64e0ab0f8f098dc2ac48e077fe23f488ac24b665166898115a lastState: {} name: busybox ready: true restartCount: 0 started: true state: running: startedAt: "2020-01-09T23:18:00Z" - containerID: docker://676a2d9bebda40d86138190093d1a6d6cf6f16e5ff0e89fc22df53a74bdf8048 image: nginx:latest imageID: docker-pullable://nginx@sha256:8aa7f6a9585d908a63e5e418dc5d14ae7467d2e36e1ab4f0d8f9d059a3d071ce lastState: {} name: nginx ready: true restartCount: 0 started: true state: running: startedAt: "2020-01-09T23:17:55Z" hostIP: 192.168.132.133 phase: Running podIP: 10.244.2.7 podIPs: - ip: 10.244.2.7 qosClass: BestEffort startTime: "2020-01-09T23:17:48Z"
[root@docker-server1 pods]# kubectl get pods nginx -o yaml > nginx-pods.yaml
删除不必要的信息
[root@docker-server1 pods]# vim nginx-pods.yaml
apiVersion: v1 kind: Pod metadata: annotations: test: this is a test app labels: app: nginx name: nginx namespace: default spec: containers: - env: - name: test value: aaa - name: test1 value: bbb image: nginx imagePullPolicy: Always name: nginx ports: - containerPort: 80 hostPort: 8080 protocol: TCP - command: - sh - -c - sleep 3600 image: busybox imagePullPolicy: Always name: busybox restartPolicy: Always
[root@docker-server1 pods]# kubectl delete pod nginx
[root@docker-server1 pods]# kubectl create -f nginx-pods.yaml
[root@docker-server1 pods]# kubectl get pods
NAME READY STATUS RESTARTS AGE nginx 2/2 Running 0 14s
[root@docker-server1 pods]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES nginx 2/2 Running 0 27s 10.244.2.8 192.168.132.133 <none> <none>
[root@docker-server1 pods]# curl http://192.168.132.133:8080
[root@docker-server1 pods]# curl http://10.244.2.8
<!DOCTYPE html> <html> <head> <title>Welcome to nginx!</title> <style> body { width: 35em; margin: 0 auto; font-family: Tahoma, Verdana, Arial, sans-serif; } </style> </head> <body> <h1>Welcome to nginx!</h1> <p>If you see this page, the nginx web server is successfully installed and working. Further configuration is required.</p> <p>For online documentation and support please refer to <a href="http://nginx.org/">nginx.org</a>.<br/> Commercial support is available at <a href="http://nginx.com/">nginx.com</a>.</p> <p><em>Thank you for using nginx.</em></p> </body> </html>
pod的简单操作学习到这里
博主声明：本文的内容来源主要来自誉天教育晏威老师，由本人实验完成操作验证，需要的博友请联系誉天教育（http://www.yutianedu.com/），获得官方同意或者晏老师（https://www.cnblogs.com/breezey/）本人同意即可转载，谢谢！
标签：probe net 启动 spro assign ase head 理念 rac
原文地址：https://www.cnblogs.com/zyxnhr/p/12182534.html
