在上一篇文章中我们使用kubectl run的方式来创建一个pod,但是pod中只含有一个container。我们知道pod中是可以包含多个container的,在这篇文章中,将会通过创建一个由sonarqube+postgresql组成的pod来演示在kubernetes中如何使用多个container来组成一个pod。
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 |egrep ‘sonar|post‘> done[host132]docker.io/sonarqube ???????????????latest ?????????????eea2f3093d50 ???????6 days ago ?????????790.9 MBdocker.io/postgres ????????????????latest ?????????????6f86882e145d ???????7 days ago ?????????265.9 MB[host133]docker.io/sonarqube ???????????????latest ?????????????eea2f3093d50 ???????Less than a second ago ??790.9 MBdocker.io/postgres ????????????????latest ?????????????6f86882e145d ???????Less than a second ago ??265.9 MB[host134]docker.io/sonarqube ???????????????latest ?????????????eea2f3093d50 ???????Less than a second ago ??790.9 MBdocker.io/postgres ????????????????latest ?????????????6f86882e145d ???????Less than a second ago ??265.9 MB[root@host131 ~]#
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docker-compose方式
先来看看docker的docker-compose方式下是怎样做的。
docker-compose.yml
[root@host132 sonar]# cat docker-compose.ymlversion: ‘2‘services: ?sonarqube: ???image: sonarqube ???ports: ????- "9000:9000" ???links: ????- postgres:db ???environment: ????- SONARQUBE_JDBC_URL=jdbc:postgresql://db:5432/sonar ?postgres: ???image: postgres ???environment: ????- POSTGRES_USER=sonar ????- POSTGRES_PASSWORD=sonar[root@host132 sonar]#
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docker-compose up启动
[root@host132 sonar]# docker-compose up -dCreating network "sonar_default" with the default driverCreating sonar_postgres_1Creating sonar_sonarqube_1[root@host132 sonar]#
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docker-compose ps确认结果
[root@host132 sonar]# docker-compose ps ?????Name ????????????????????Command ??????????????State ??????????Ports-----------------------------------------------------------------------------------sonar_postgres_1 ???/docker-entrypoint.sh postgres ??Up ?????5432/tcpsonar_sonarqube_1 ??./bin/run.sh ????????????????????Up ?????0.0.0.0:9000->9000/tcp[root@host132 sonar]#
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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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sonar.yml
[root@host131 tmp]# cat sonarqube.ymlapiVersion: v1kind: Podmetadata: ?name: sonar ?labels: ???app: webspec: ?containers: ???- name: sonarqube ?????image: sonarqube ?????ports: ???????- containerPort: 9000 ?????env: ???????- ?????????name: "SONARQUBE_JDBC_URL" ?????????value: "jdbc:postgresql://postgres:5432/sonar" ???- name: postgres ?????image: postgres ?????env: ???????- ?????????name: "POSTGRES_USER" ?????????value: "sonar" ?????????name: "POSTGRES_PASSWORD" ?????????value: "sonar"[root@host131 tmp]#
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创建pod
多个pod的方式,就只能使用create语句才能创建
[root@host131 tmp]# kubectl create -f sonarqube.ymlpod "sonar" created[root@host131 tmp]#
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确认pod的创建结果
确认状态发现正在创建之中, READY的状态显示0/2,表明此pod有2个container,现在还都没有ready。
[root@host131 tmp]#[root@host131 tmp]# kubectl get podsNAME ?????READY ????STATUS ?????????????RESTARTS ??AGEsonar ????0/2 ??????ContainerCreating ??0 ?????????19s[root@host131 tmp]#
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稍等一会,再次确认已经是running状态,READY也显示为2/2,说明此pod中的2个container都已正常启动
[root@host131 tmp]# kubectl get podsNAME ?????READY ????STATUS ???RESTARTS ??AGEsonar ????2/2 ??????Running ??1 ?????????2m[root@host131 tmp]#
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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 tmp]# kubectl get pods -o wideNAME ?????READY ????STATUS ?????????????RESTARTS ??AGE ??????NODEsonar ????2/2 ??????Running ????????????0 ?????????2m ???????host133[root@host131 tmp]#
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Kubernetes 多container组成的Pod
原文地址:https://www.cnblogs.com/firsttry/p/10194891.html