[SOLVED] docker - cant install additional software/packages inside container

czezz · 11-22-2016, 09:23 AM

I try to install new package inside of docker image/container.
I follow some examples that I have google'd and it does not really work like for them:

Code:

[root@centos7 ~]# docker run -it ubuntu bash
root@2869c7f4bb2e:/# apt-get install htop
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package htop
root@2869c7f4bb2e:/#

What am I doing wrong?

sag47 · 11-22-2016, 11:02 AM

Code:

apt-get update
apt-get install htop

To update the package cache. Package cache is usually cleared to make the container image size smaller.

If that doesn't work, then test network connectivity. If you don't have connectivity, then restart the docker daemon as it is likely missing iptables rules for routing.

sag47 · 11-25-2016, 12:25 AM

I forgot to mention if you're building on another image to customize it then don't forget to clean up the package cache to keep the image size reasonable.

Habitual · 11-28-2016, 10:48 AM

Don't forget to rebuild the new container once you manage to get htop installed,
After rebuilding, htop stays installed.

Here's some docker.fu
http://www.dockerbook.com/TheDockerBook_sample.pdf
https://blog.docker.com/2013/06/14-g...als-on-docker/
http://stackoverflow.com/search?q=docker
https://blog.docker.com/2015/03/dock...ommand-basics/

UCotter · 08-17-2017, 03:04 PM

What are you using for your base image? Can you post the contents of your Dockerfile?