docker run sed不起作用

我正在接近Docker.我创建了Debootstraping Debian Jessie的映像,我想将contrib部分添加到APT源文件中.

/etc/apt/sources.list的内容是:

$docker run some/image cat /etc/apt/sources.list
deb http://debian.fastweb.it/debian jessie main
deb http://debian.fastweb.it/debian jessie-updates main
deb http://security.debian.org/ jessie/updates main

我希望他们是:

deb http://debian.fastweb.it/debian jessie main contrib
deb http://debian.fastweb.it/debian jessie-updates main contrib
deb http://security.debian.org/ jessie/updates main contrib

所以我运行了这个命令:

docker run some/image sed -i 's/main/main contrib/g' /etc/apt/sources.list

哪个没有错误退出;但它不会更新/etc/apt/sources.list内容:

$docker run some/image cat /etc/apt/sources.list
deb http://debian.fastweb.it/debian jessie main
deb http://debian.fastweb.it/debian jessie-updates main
deb http://security.debian.org/ jessie/updates main
最佳答案
您没有更改图像.您基于图像启动了一个容器.然后,您运行sed命令并更改了文件内容.检查docker ps -a以查看刚刚关闭的容器的ID.如果您使用docker cp提取文件,则应该看到它已按预期更改(假设sed命令正常).

您还可以创建一个Dockerfile

FROM some/image
RUN sed -i 's/main/main contrib/g' /etc/apt/sources.list
# this command is just temporary, you probably are going to do something else
CMD cat /etc/apt/sources.list

并运行新映像docker运行some / new-image以获得预期的输出.

结论-您可能想在原始映像Dockerfile中运行sed命令.

转载注明原文:docker run sed不起作用 - 代码日志