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Got issues trying docker checkpoint

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(Farhood) #1

Hi,
I am trying to test docker checkpoint following the guidelines available here

I noticed that I need to enable experimental mode for docker.
So I installed experimental version from here in a fresh ubuntu installation.

Then I noticed that the docker daemon is not running. So, I enabled it by doing usermod -aG docker $(whoami) and logging off and logging on and starting docker service by doing sudo service docker start

then trying again the checkpoint command I got the error that docker checkpoint is not known.
I noticed that I need to upgrade my docker version to at least 1.3.0 according to this.
So, I upgraded my docker version to 1.9.1 using guidelines that I found here
But then again I got the error that cannot connect to the docker deamon.
So, I tried doing usermod -aG docker $(whoami) and logging off and logging on and starting docker service by doing sudo service docker start.
But this time I got the error that

Failed to start docker.service: Unit docker.service is masked.

Can someone help to know how can I use docker checkpoint?
I need to migrate my containers to another host in the system that I am developing and it is very important part of the project.
There is some nice demo of live migration on youtube but unfortunately, there is no good documentation or tutorials for his important feature …

Thanks