Kubernetes单Pod操作

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在上一篇文章中我们使用RC的方式创建了一个sonarqube的方式的pod，这篇文章中将会使用kubectl run的方式来创建一个pod，并会简单确认一下这两者有何不同。

构成说明

 

演示程序使用下列的集群构成。

                                               

No	type	IP	OS
1	master	192.168.32.131	CENTOS7.2
2	etcd	192.168.32.131	CENTOS7.2
3	minion	192.168.32.132	CENTOS7.2
3	minion	192.168.32.133	CENTOS7.2
3	minion	192.168.32.134	CENTOS7.2

事前准备

 

事前将所需镜像提前pull下的各个minion节点

[root@host131 ~]# for h in host132 host133 host134> do> echo "$h"> ssh $h docker images |grep sonarqube> donehost132docker.io/sonarqube              latest              eea2f3093d50        5 days ago          790.9 MBhost133docker.io/sonarqube                latest              eea2f3093d50        Less than a second ago   790.9 MBhost134docker.io/sonarqube                latest              eea2f3093d50        Less than a second ago   790.9 MB[root@host131 ~]#
  
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事前确认

 

事前确认：没有pod

[root@host131 ~]# kubectl get pods[root@host131 ~]#
  
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创建pod

[root@host131 ~]# kubectl run example --image=sonarqubedeployment "example" created[root@host131 ~]#
  
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确认pod的创建结果

 

确认已经是running状态

[root@host131 ~]# kubectl get podsNAME                       READY     STATUS    RESTARTS   AGEexample-3821493920-c7c8v   1/1       Running   0          1m[root@host131 ~]#
  
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确认pod所在的node

 

我们有3个node，到底是在哪台node上运行这个pod呢

[root@host131 ~]# kubectl get pod -o wideNAME                       READY     STATUS    RESTARTS   AGE       NODEexample-3821493920-c7c8v   1/1       Running   1          6m        host134[root@host131 ~]#
  
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通过rancher，也可以确认到在host134上跑这个这个example-3821493920-c7c8v

describe pod

 

通过kubectl describe pod来确认一下详细信息，可以和RC创建的方式进行比较。

[root@host131 ~]# kubectl describe pod example-3821493920-c7c8vName:           example-3821493920-c7c8vNamespace:      defaultNode:           host134/192.168.32.134Start Time:     Tue, 30 Aug 2016 13:01:03 -0400Labels:         pod-template-hash=3821493920,run=exampleStatus:         RunningIP:             172.16.64.5Controllers:    ReplicaSet/example-3821493920Containers:  example:    Container ID:       docker://363971c9af13a301a3998c54957bc0579f78e66f66d2064ee61940bb49325f54    Image:              sonarqube    Image ID:           docker://sha256:eea2f3093d50fde1a5cf90faea4e20b6cc966768885ee9b264ec2c616d803cd2    Port:    QoS Tier:      cpu:              BestEffort      memory:           BestEffort    State:              Terminated      Reason:           Completed      Exit Code:        0      Started:          Tue, 30 Aug 2016 13:01:39 -0400      Finished:         Tue, 30 Aug 2016 13:04:22 -0400    Ready:              False    Restart Count:      0    Environment Variables:Conditions:  Type          Status  Ready         FalseVolumes:  default-token-8209b:    Type:       Secret (a volume populated by a Secret)    SecretName: default-token-8209bEvents:  FirstSeen     LastSeen        Count   From                    SubobjectPath                   Type            Reason          Message  ---------     --------        -----   ----                    -------------                   --------        ------          -------  7d            7d              1       {kubelet host134}       spec.containers{example}        Normal          Pulling         pulling image "sonarqube"  7d            7d              1       {kubelet host134}       spec.containers{example}        Normal          Pulled          Successfully pulled image "sonarqube"  7d            7d              1       {kubelet host134}       spec.containers{example}        Normal          Created         Created container with docker id 363971c9af13  7d            7d              1       {kubelet host134}       spec.containers{example}        Normal          Started         Started container with docker id 363971c9af13  3m            3m              1       {default-scheduler }                                    Normal          Scheduled       Successfully assigned example-3821493920-c7c8v to host134[root@host131 ~]#
  
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