Write to /etc/hosts in docker container when running docker container

Question

I am trying to write to the file in /etc/hosts within a docker container when I perform the run command, but when I shh into the container and check the hosts file, nothing has been written.

What is the correct command to do this?

I am running my image with the following command:

docker run -it -p 3000:3000 <imageName> bash echo 192.168.56.101 mypath.dev >> /etc/hosts

-it and -d are conflicting. The first spawns an interactive terminal, the second lets it run as a daemon in the background. Please fix that first. — michaelbahr
– michaelbahr, Commented Feb 8, 2016 at 11:54
ahh, sorry. I had been playing around with it and forgot to remove the -d — hyprstack
– hyprstack, Commented Feb 8, 2016 at 11:55
I'm a bit confused about the first semicolon. I'd start a bash with docker run ... myimage bash (no semicolon here). — michaelbahr
– michaelbahr, Commented Feb 8, 2016 at 11:58
My problem is not with starting a bash. It's adding the IP address to the hosts file so that I don't have to do it manually everytime. — hyprstack
– hyprstack, Commented Feb 8, 2016 at 12:06
The IP address that you want to include in /etc/hosts is for another container in your docker host? This is not the best ways to connect containers — Hemerson Varela
– Hemerson Varela, Commented Feb 8, 2016 at 18:48

Mark O'Connor · Accepted Answer · 2016-02-08 18:28:50Z

4

Use the "add-host" parameter when running the container:

docker run -it --add-host db-static:86.75.30.9 ubuntu cat /etc/hosts

answered Feb 8, 2016 at 18:28

Mark O'Connor

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