How I can add new nameserver in /etc/resolv.conf (dockerfile)?
On my dockerfile I use:
FROM ubuntu:14.04
RUN echo "nameserver 10.111.122.1" >> /etc/resolv.conf
On my test I use:
docker run --rm 746cb98d6c9b echo cat /etc/resolv.conf
I didn't get my change (the new nameserver)... So I try adding mannualy with
docker run --rm 746cb98d6c9b echo "nameserver 10.111.122.1" >> /etc/resolv.conf
and I get
zsh: permission denied: /etc/resolv.conf
How I can change permission of this file OR use a root user OR use a chmod in docker files ? My real task is to add and dns server for my build of this dockerfile.
I'm using a linux mint.
I'm get a correct result with a ping test on docker run command (with --dns)
So, one of the ways you can add new DNS information to your container's build process is by adding some startup options to your Docker daemon. The documentation for that process reveals that the option you'll use is --dns. The location of your configuration file depends on your specific distro. On my Linux Mint machine, the file is in /etc/default/docker. On Linux Mint, look for the DOCKER_OPTS= line, and add the appropriate --dns=x.x.x.x entries to that line.
For example, if you want to use Google's DNS, you should change that line to look like this:
DOCKER_OPTS="--dns=8.8.4.4 --dns=8.8.8.8"
Additionally, in the absense of --dns or --dns-search startup options, Docker will use the /etc/resolv.conf of the host it's running on instead.