Fix Docker Networking Problem

We may met situations that docker cannot connect to the internet. And the error message look like this:

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Step 1/3 : FROM docker/whalesay:latest
 ---> 6b362a9f73eb
Step 2/3 : RUN apt-get -y update && apt-get install -y fortunes
 ---> Running in 10c0ca4a809a
Err http://archive.ubuntu.com trusty InRelease
  
Err http://archive.ubuntu.com trusty-updates InRelease
  
Err http://archive.ubuntu.com trusty-security InRelease
  
Err http://archive.ubuntu.com trusty Release.gpg
  Could not resolve 'archive.ubuntu.com'
Err http://archive.ubuntu.com trusty-updates Release.gpg
  Could not resolve 'archive.ubuntu.com'
Err http://archive.ubuntu.com trusty-security Release.gpg
  Could not resolve 'archive.ubuntu.com'
Reading package lists...
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/trusty/InRelease  

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/trusty-updates/InRelease  

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/trusty-security/InRelease  

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/trusty/Release.gpg  Could not resolve 'archive.ubuntu.com'

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/trusty-updates/Release.gpg  Could not resolve 'archive.ubuntu.com'

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/trusty-security/Release.gpg  Could not resolve 'archive.ubuntu.com'

W: Some index files failed to download. They have been ignored, or old ones used instead.
....

This because docker network not properly set up yet. To set network on docker, we can do this:

Find primary and secondary dns server using this command:

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$ nmcli dev show | grep 'IP4.DNS'

Create file /etc/docker/daemon.json and add:

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{
	"dns": ["10.0.0.2", "10.0.0.3"]
}

Or you can change dns using google dns 8.8.8.8 and 8.8.4.4.

Finally, restart docker: sudo service docker restart

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