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alphine镜像的使用技巧

 2 years ago
source link: https://zhangrr.github.io/posts/20211104-alphine_usage/
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用 alphine 镜像的一些常用技巧：

会随时增加：

一、修改源，用国外的源非常慢，替换成国内的中科大源

sed -i 's/dl-cdn.alpinelinux.org/mirrors.ustc.edu.cn/g' /etc/apk/repositories

二、更新apk库

apk update

三、安装软件

#安装telnet
apk add busybox-extras

#安装curl
apk add curl

#安装时间组件
apk add tzdata

#更新并且安装软件
apk add --update tzdata

四、进入容器一步执行换源、更新、安装

sed -i 's/dl-cdn.alpinelinux.org/mirrors.ustc.edu.cn/g' /etc/apk/repositories && apk update && apk add curl && apk add busybox-extras

五、解决缺少glibc库的问题

如果不ln会报错，原因是缺少glibc库！！！解决方法如下：

RUN mkdir /lib64 && \  
    ln -s /lib/libc.musl-x86_64.so.1 /lib64/ld-linux-x86-64.so.2

六、一些调试的CMD

CMD ["/bin/bash", "-c", "while true; do echo hi; sleep 10; done"]

kubectl run curlpod --image=radial/busyboxplus:curl --command -- /bin/sh -c "while true; do echo hi; sleep 10; done"

七、pod的等待技巧

这儿里启动正式的pod之前，先临时起了两个容器等待其他服务的完成

  containers: 
  - name: myapp-container 
    image: busybox 
    command: ['sh', '-c', 'echo The app is running! && sleep 3600'] 
  initContainers: 
  - name: init-myservice 
    image: busybox 
    command: ['sh', '-c', 'until nslookup myservice; do echo waiting for myservice; sleep 2; done;'] 
  - name: init-mydb 
    image: busybox 
    command: ['sh', '-c', 'until nslookup mydb; do echo waiting for mydb; sleep 2; done;']

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