Docker Cloud moving one node from one account to another

Problem

You have used ‘Bring your own node’ to use a server with one account, but you want to change the account and move the node to the new one.

Solution

Use your old account to terminate the node or login to the server and use the following to stop the running dockercloud-agent:

Go to the Docker Cloud web ui interface, and use the 'Bring your own node'. Copy the token that appears after the sudo -H sh -s on the popup window.

On the server update the token with the one from the new account that you just copied, by running the following:

And now restart the dockercloud-agent on the server:

You should now be able to see 'Node xxxx detected' on the Docker Cloud web ui after a couple of minutes.

Clearing unused (dangling) docker volumes

Problem

After you start using and building Docker images, there is a case that there is a lot of space used even after deleting images and containers (a few GB maybe).

Solution

To clean out the volumes that are no longer used (ie dangling) use the following:

Using Elixir with Docker

In order to be able to use Elixir with the help of Docker, so that you can run different containers with different versions, and to have a shared code folder, you could follow the steps below:

  • Install docker in your system. Installation instructions for different systems are here
  • Download the elixir image from the Docker Hub:
  • List the images on your host:
  • Start a specific version of the elixir docker container (ie elixir 1.0.3):
  • Use a shared folder with code between the docker container and your host: where the folders after the -v option are /home/user/Prog (host) and /Prog (docker)
  • Use a port forwarding:

Docker error – error response from daemon: Cannot start container….is not within /var/lib/docker/aufs/mnt

Problem

You are trying to use an image from Docker in your Ubuntu 14.04 system, but you are getting a error like the following:

Solution

Your docker version is outdated (ie 1.0.1) so you would need to upgrade your docker installation.
There is a script for this (information from here):

After running the following you should be able to use your images as normal with: sudo docker run -t -i image/name bin/bash: