Kubernetes基础：使用从源码自行构建的Pause镜像

绝地灬酷狼 2023-07-04 08:36 7阅读 0赞

在前一篇文章中介绍了如何从源码编译Pause二进制文件并基于scratch创建pause的基础镜像，在这篇文章中我们使用Easypack提供的Ansible脚本来验证创建1.17.2的集群中使用此pause镜像是否能够正常动作。

# 事前准备 #

[root@liumiaocn pause]# docker images
    REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
    pause               latest              941e4c6fbe0e        18 minutes ago      895 kB
    [root@liumiaocn pause]# docker tag pause:latest gcr.io/google_containers/pause-amd64:3.1
    [root@liumiaocn pause]# docker images
    REPOSITORY                             TAG                 IMAGE ID            CREATED             SIZE
    gcr.io/google_containers/pause-amd64   3.1                 941e4c6fbe0e        18 minutes ago      895 kB
    pause                                  latest              941e4c6fbe0e        18 minutes ago      895 kB
    [root@liumiaocn pause]# docker save gcr.io/google_containers/pause-amd64:3.1 >pause.tar
    [root@liumiaocn pause]# ls
    bin  CHANGELOG.md  Dockerfile  Makefile  orphan.c  pause  pause.c  pause.tar
    [root@liumiaocn pause]#

# 官方pause镜像下的集群 #

[root@host131 images]# kubectl get nodes -o wide
    NAME              STATUS   ROLES    AGE    VERSION   INTERNAL-IP       EXTERNAL-IP   OS-IMAGE                KERNEL-VERSION          CONTAINER-RUNTIME
    192.168.163.131   Ready    <none>   5h5m   v1.17.2   192.168.163.131   <none>        CentOS Linux 7 (Core)   3.10.0-957.el7.x86_64   docker://19.3.5
    [root@host131 images]#
    
    [root@host131 images]# docker images |grep pause
    gcr.io/google_containers/pause-amd64    3.1                 da86e6ba6ca1        2 years ago         742kB
    [root@host131 images]#

# 创建集群 #

本文使用Kubernetes 1.17.2，可参看下文进行快速环境搭建：

*  [单机版本或者集群版本环境搭建][Link 1]

事前pause文件替换，替换离线安装包下的pause.tar文件

[root@host131 ansible]# ls /tmp/binary/images/
    coredns.tar  dashboard.tar  metrics.tar  pause.tar  prometheus.tar
    [root@host131 ansible]#

> 执行命令：ansible-playbook 10.all-in-one.yml

[root@host131 ansible]# kubectl get node -o wide
    NAME              STATUS   ROLES    AGE     VERSION   INTERNAL-IP       EXTERNAL-IP   OS-IMAGE                KERNEL-VERSION          CONTAINER-RUNTIME
    192.168.163.131   Ready    <none>   2m25s   v1.17.2   192.168.163.131   <none>        CentOS Linux 7 (Core)   3.10.0-957.el7.x86_64   docker://19.3.5
    [root@host131 ansible]#

*  Pause镜像确认

[root@host131 ansible]# docker images |grep pause
    gcr.io/google_containers/pause-amd64    3.1                 941e4c6fbe0e        32 minutes ago      895kB
    [root@host131 ansible]#

# 动作确认 #

这里创建一个Pod来确认pause是否正常动作，YAML文件如下所示

[root@host131 Pod]# cat pod.yaml 
    ---
    apiVersion: v1
    kind: Pod
    metadata:
      name: testbox
      namespace: default
    spec:
      containers:
      - name: testbox-host
        image: busybox:latest
        command: ["sleep"]
        args: ["1000"]
    ...
    [root@host131 Pod]#

创建Pod

[root@host131 Pod]# kubectl create -f pod.yaml 
    pod/testbox created
    [root@host131 Pod]# 
    [root@host131 Pod]# kubectl get pods -o wide
    NAME      READY   STATUS    RESTARTS   AGE   IP             NODE              NOMINATED NODE   READINESS GATES
    testbox   1/1     Running   0          8s    10.254.176.3   192.168.163.131   <none>           <none>
    [root@host131 Pod]#

确认Pause容器动作

[root@host131 Pod]# docker ps |grep testbox
    02f3cb12684a        busybox                                    "sleep 1000"             18 seconds ago      Up 17 seconds                           k8s_testbox-host_testbox_default_ab11e256-dad9-4fd1-a487-6d37a2bfc51b_0
    385053a71db2        gcr.io/google_containers/pause-amd64:3.1   "/pause"                 24 seconds ago      Up 23 seconds                           k8s_POD_testbox_default_ab11e256-dad9-4fd1-a487-6d37a2bfc51b_0
    [root@host131 Pod]#

确认是否能正常进入到pod中

[root@host131 Pod]# kubectl exec -it testbox sh
    / # hostname
    testbox
    / # ps -ef
    PID   USER     TIME  COMMAND
        1 root      0:00 sleep 1000
        6 root      0:00 sh
       12 root      0:00 ps -ef
    / #

# 总结 #

使用自行编译生成的pause二进制文件所创建的镜像构建Kubernetes集群，发现动作也能够正常动作。

[Link 1]: https://blog.csdn.net/liumiaocn/article/details/103725251