GNS3 in Linux – Tech Tip – Docker Error

I recently watched a YouTube video where one of the GNS3 creators was talking about GNS3 and how it runs.  This convinced me to consider moving my GNS3 development work to the Linux world.  I had done this years ago for the hands on training classes but my own development environment has been Windows based.  To be fair, I have had few problems – mostly just GNS3 growing pains, but long ago learned that Linux was much more reliable.  This video made it clear that GNS3 in Linux was superior, and it further meant I was going to be less dependent on a GNS3 VM (which is Linux based) when using Windows and/or a MAC.

So the first thing I wanted to do on my new native Linux/GNS3 development  environment was get Ansible and other Docker based appliances up and running.

I hit a wall!

The appliances appeared to install correctly, but I kept getting an ugly error:

Error while creating node: Docker has returned an error: Cannot connect to host docker:80 ssl:False [No such file or directory]


The problem was, I did not have Docker installed.  So here are the steps:

First – make sure you have curl installed.  If you do not have curl installed then install curl with:

sudo apt-get install curl

Next, install docker with the following command:

curl -fsSL | sh

After installing Docker you need to add your user name in the docker group with the following command (put your user name in place of ‘username’ below): 

$ sudo usermod -aG docker username

Verify if the docker service is started with following command:

$ service docker status

If docker is not started then start with following command:

$ sudo service docker start

Now, close GNS3, and reboot your machine.

You will find all works fine.

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