I've been playing with Docker for part of a project, and came across this annoying but important message:
WARNING: Local (127.0.0.1) DNS resolver found in resolv.conf and containers can't use it. Using default external servers : [8.8.8.8 8.8.4.4]
The problem? /etc/resolv.conf
has nameserver 127.0.0.1
(or nameserver 127.0.1.1
) in it.
I worked out that Ubuntu 14.04 LTS uses a daemon called dnsmasq
, which routes DNS traffic through to the DNS servers provided by DHCP.
While this works fine for Docker, that message is quite annoying.
I disabled dnsmasq in /etc/NetworkManager/NetworkManager.conf
:
$ sudo nano /etc/NetworkManager/NetworkManager.conf
#dns=dnsmasq
I then added the public Google DNS servers to /etc/dhcp/dhclient.conf
:
$ sudo nano /etc/dhcp/dhclient.conf
prepend domain-name-servers 8.8.8.8,8.8.4.4;
Then you just need to restart NetworkManager:
$ sudo restart network-manager
And now you can start Docker containers without that pesky message!
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