k8s1.5.3集群测试之部署PODS实例

Posted 2020-09-01

k8s1.5.3集群测试之部署PODS实例

安装部署集群环境参考

http://jerrymin.blog.51cto.com/3002256/1898243

测试docker容器参考Guestbook示例

1，下载镜像

本例中使用3个Docker镜像，下载地址为https://hub.docker.com/u/kubeguide/

[[email protected] ~]# docker pull kubeguide/guestbook-php-frontend

[[email protected] ~]# docker pull kubeguide/guestbook-redis-master

[[email protected] ~]# docker pull kubeguide/guestbook-redis-slave  

查看镜像

[[email protected] ~]# docker images

REPOSITORY                                   TAG                 IMAGE ID            CREATED             SIZE

docker.io/kubeguide/guestbook-php-frontend   latest              47ee16830e89        7 months ago        510 MB

docker.io/kubeguide/redis-master             latest              405a0b586f7e        18 months ago       419.1 MB

docker.io/kubeguide/guestbook-redis-slave    latest              e0c36a1fa372        18 months ago       109.5 MB

2，创建redis-mastr RC和Service

例子可参考Kubernetes实践指南第二章

[[email protected] guestbook]# ls

frontend-rc.yaml       redis-master-rc.yaml       redis-slave-rc.yaml

frontend-service.yaml  redis-master-service.yaml  redis-slave-service.yaml

首先为redis-master创建一个RC（副本控制器）

[[email protected] guestbook]# cat redis-master-rc.yaml 

apiVersion: v1

kind: ReplicationController

metadata:

  name: redis-master

  labels:

    name: redis-master

spec:

  replicas: 1

  selector:

    name: redis-master

  template:

    metadata:

      labels:

        name: redis-master

    spec:

      containers:

      - name: master

        image: kubeguide/redis-master

        ports:

        - containerPort: 6379

在master节点执行如下创建RC redis-master

[[email protected] guestbook]# kubectl create -f redis-master-rc.yaml

replicationcontroller "redis-master" created

[[email protected] guestbook]# kubectl get rc

NAME           DESIRED   CURRENT   READY     AGE

redis-master   1         1         0         8s

在master节点执行如下创建Service  redis-master

[[email protected] guestbook]# kubectl create -f redis-master-service.yaml 

service "redis-master" created

[[email protected] guestbook]# kubectl get svc

NAME           CLUSTER-IP     EXTERNAL-IP   PORT(S)    AGE

kubernetes     10.254.0.1     <none>        443/TCP    1d

redis-master   10.254.6.192   <none>        6379/TCP   12s

[[email protected] guestbook]# kubectl get pods -o wide

NAME                 READY     STATUS    RESTARTS   AGE       IP         NODE

redis-master-qg457   1/1       Running   0          1h        10.1.8.2   k8s-node2

可以看到Pod运行在k8s-node2节点上，node间可以通过tcp 10.1.8.2的6379端口访问redis-master

查看描述信息

[[email protected] guestbook]# kubectl describe pods  redis-master-qg457 

Name: redis-master-qg457

Namespace: default

Node: k8s-node2/172.17.3.8

Start Time: Thu, 16 Feb 2017 12:45:19 +0800

Labels: name=redis-master

Status: Running

IP: 10.1.8.2

Controllers: ReplicationController/redis-master

Containers:

  master:

    Container ID: docker://eb2e83544f80e54c3f864f1a4a1edd062b9bb94d979137509e41673f85d90160

    Image: kubeguide/redis-master

    Image ID: docker-pullable://docker.io/kubeguide/[email protected]:e11eae36476b02a195693689f88a325b30540f5c15adbf531caaecceb65f5b4d

    Port: 6379/TCP

    State: Running

      Started: Thu, 16 Feb 2017 12:46:02 +0800

    Ready: True

    Restart Count: 0

    Volume Mounts: <none>

    Environment Variables: <none>

Conditions:

  Type Status

  Initialized True 

  Ready True 

  PodScheduled True 

No volumes.

QoS Class: BestEffort

Tolerations: <none>

No events.

在k8s-node2上确认docer进程

[[email protected] ~]# docker ps

CONTAINER ID        IMAGE                                                        COMMAND                  CREATED             STATUS              PORTS               NAMES

eb2e83544f80        kubeguide/redis-master                                       "redis-server /etc/re"   About an hour ago   Up About an hour                        k8s_master.dd7e04d1_redis-master-qg457_default_b755b620-f402-11e6-b4a4-c81f66d97bc3_de6042eb

26f1ae8f360c        registry.access.redhat.com/rhel7/pod-infrastructure:latest   "/pod"                   About an hour ago   Up About an hour                        k8s_POD.36030bb2_redis-master-qg457_default_b755b620-f402-11e6-b4a4-c81f66d97bc3_da1642b5

3，创建redis-slave RC和Service

[[email protected] guestbook]# kubectl create -f redis-slave-rc.yaml 

replicationcontroller "redis-slave" created

[[email protected] guestbook]# kubectl get rc

NAME           DESIRED   CURRENT   READY     AGE

redis-master   1         1         1         3h

redis-slave    2         2         2         1m

[[email protected] guestbook]# kubectl get pods -o wide

NAME                 READY     STATUS    RESTARTS   AGE       IP          NODE

redis-master-qg457   1/1       Running   0          3h        10.1.8.2    k8s-node2

redis-slave-40tjp    1/1       Running   0          1m        10.1.8.3    k8s-node2

redis-slave-fh4mg    1/1       Running   0          1m        10.1.89.2   k8s-node1

[[email protected] guestbook]# kubectl create -f redis-slave-service.yaml 

service "redis-slave" created

[[email protected] guestbook]# kubectl get services

NAME           CLUSTER-IP       EXTERNAL-IP   PORT(S)    AGE

kubernetes     10.254.0.1       <none>        443/TCP    1d

redis-master   10.254.6.192     <none>        6379/TCP   2h

redis-slave    10.254.183.118   <none>        6379/TCP   3m

查看主从状态

[[email protected] guestbook]#  kubectl exec redis-master-qg457 redis-cli info|grep role

role:master

[[email protected] guestbook]#  kubectl exec redis-slave-40tjp  redis-cli info|grep role

role:slave

[[email protected]r guestbook]#  kubectl exec redis-slave-40tjp  redis-cli info|grep master

master_host:redis-master

master_port:6379

master_link_status:down

master_last_io_seconds_ago:-1

master_sync_in_progress:0

master_link_down_since_seconds:1487234901

master_repl_offset:0

进入修改hosts，由于没有kube-dns，所有slave都需要手动添加redis-master解析

[[email protected] guestbook]#  kubectl exec -ti redis-slave-40tjp -- bash

[email protected]:/data#echo ‘10.1.8.2 redis-master‘ >> /etc/hosts

4，创建frontend RC和Service

[[email protected] guestbook]# kubectl create -f frontend-rc.yaml 

replicationcontroller "frontend" created

[[email protected] guestbook]# kubectl create -f frontend-service.yaml 

service "frontend" created

[[email protected] guestbook]# kubectl get rc

NAME           DESIRED   CURRENT   READY     AGE

frontend       3         3         2         14s

redis-master   1         1         1         4h

redis-slave    2         2         2         1h

[[email protected] guestbook]# kubectl get pods

NAME                 READY     STATUS    RESTARTS   AGE

frontend-jfz4c       1/1       Running   0          20s

frontend-lktm2       1/1       Running   0          20s

frontend-t8ctd       1/1       Running   0          20s

redis-master-qg457   1/1       Running   0          4h

redis-slave-40tjp    1/1       Running   0          1h

redis-slave-fh4mg    1/1       Running   0          1h

[[email protected] guestbook]# kubectl get service

NAME           CLUSTER-IP       EXTERNAL-IP   PORT(S)        AGE

frontend       10.254.214.44    <nodes>       80:30001/TCP   2m

kubernetes     10.254.0.1       <none>        443/TCP        1d

redis-master   10.254.6.192     <none>        6379/TCP       3h

redis-slave    10.254.183.118   <none>        6379/TCP       1h

5，通过浏览器访问frontend页面

访问IP是node的IP加30001端口 ，本次测试应该是

http://172.17.3.7:30001或者http://172.17.3.8:30001目前是两个测试node

本文出自 “jerrymin” 博客，请务必保留此出处http://jerrymin.blog.51cto.com/3002256/1900260