在Docker容器中如何使root可写/ etc / hosts？ [英] How can I make /etc/hosts writable by root in a Docker Container?

问题描述

我刚刚使用docker并正在配置一个容器。

我无法编辑/ etc / hosts（但是需要我正在开发的一些软件）。文件的自动编辑（通过sudo或root）将其显示在只读文件系统上。手动（vim）编辑文件表示其只读，我无法以root身份保存更改（文件权限为rw为owner（root））。

我可以修改其他文件并在/ etc中添加文件。

是否有原因？

我可以更改Docker配置以允许编辑/ etc / hosts吗？

谢谢

解决方案

更新 2014-09

请参阅@Thomas答案：

/ etc / hosts现在可以从Docker 1.2写入。

原始答案

同时可以使用此黑客

< a href =https://unix.stackexchange.com/questions/57459/how-can-i-override-the-etc-hosts-file-at-user-level> https://unix.stackexchange.com / questions / 57459 / how-can-i-override-the-etc-hosts-file-at-user-level

在您的Dockerfile中：

  
添加your_hosts_file / tmp / hosts 
 RUN mkdir -p  -  / lib-override&& cp /lib/x86_64-linux-gnu/libnss_files.so.2 / lib-override 
运行perl -pi -e：/ etc / hosts：/ tmp / hosts：g'/ lib-override / libnss_files .so.2 
 ENV LD_LIBRARY_PATH / lib-override 
 

I'm new to using docker and am configuring a container.
I am unable to edit /etc/hosts (but need to for some software I'm developing). Auto-edit (via sudo or root) of the file says its on a read only file system. Manual (vim) edit of the file says its read-only and I'm unable to save changes as root (file permissions are rw for owner (root)).

I can however modify other files and add files in /etc.

Is there some reason for this?

Can I change the Docker configuration to allow edit of /etc/hosts?

thanks

解决方案

UPDATE 2014-09

See @Thomas answer:

/etc/hosts is now writable as of Docker 1.2.

Original answer

You can use this hack in the meanwhile

https://unix.stackexchange.com/questions/57459/how-can-i-override-the-etc-hosts-file-at-user-level

In your Dockerfile:

ADD your_hosts_file /tmp/hosts
RUN mkdir -p -- /lib-override && cp /lib/x86_64-linux-gnu/libnss_files.so.2 /lib-override
RUN perl -pi -e 's:/etc/hosts:/tmp/hosts:g' /lib-override/libnss_files.so.2
ENV LD_LIBRARY_PATH /lib-override

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