如何在部分隔离的主机上的 docker 容器内运行 yum？

Question

I have a machine that is on a semi-isolated network. I have to use proxy to connect to the internet. I have verified that on my host, after I set http_proxy environment variable, I can receive update from public yum repository.

Now I am trying to do the same thing inside a docker container on my machine, but it doesn't seem to work.

$docker run --rm -it --net=host rhel /bin/bash
[root@MyCont] http_proxy=http://myproxy:1234/
[root@MyCont] echo -e "[base] \nname=CentOS-7 - Base - centos.com\nbaseurl=http://mirror.centos.org/centos/7/os/\$basearch/\ngpgcheck=1\ngpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-7" > /etc/yum.repos.d/CentOS7-Base-centos.repo \
&& yum clean all \
&& yum install -y openssh-server  openssh-clients

I brought up my container in host network mode, so I assume I should have the same network stack as my host in my container. Therefore, if I set the http_proxy properly, I should have the same yum behavior inside and outside container.

Is it possible to run yum inside a docker container whose host is on a semi-isolated network that needs http_proxy to access yum?

Answer 1

you should install software inside your image on a build

thus use yum install in your dockerfile

however, if for some reason you need to yum inside the container then ....

docker run -e http_proxy=http://10.9.2.2:8080

note if yum install isn't working then try ...

yum update

first - for some reason this helps!

also use ...

docker exec -it containerName bash

to enter into the container, then try execute your yum command. export any proxy env vars as required.

Answer 2

Like danday74 said, you have to use ' export https_proxy=http...'. Works in my environment. Just to be safe, I export both http_proxy and https_proxy.