Docker has been consuming my life in the last few weeks. I have half a dozen projects in progress that use containers in some fashion, including my Visualizing MySQL’s Performance Schema project.
Since I prefer to work from a Mac laptop, I have to utilize a Linux Virtual Machine (VM) which runs the Docker daemon. Luckily, Docker Machine makes this a very simple process.
However, interacting both with Docker and Docker Machine does introduce some additional commands that I would rather simplify for the repeatable use-cases I’ve come across. With BASH aliases, this is not a problem.
Is My Docker Environment Setup?
When working with Docker through Docker Machine, you first have to set up your environment with various DOCKER_* variables, such as these:
The first alias is an easy way to check that the Docker environment is setup.
Now, all I have to type is de, and I get the Docker environment output:
Setting up My Docker Environment
But how do you set up the environment with Docker Machine? The docker-machine command provides the details:
Notice that the comments indicate you have to run the command through eval to get the terminal setup correctly. I don’t want to type that out each time I open a new terminal.
The docker-machine command requires the name of the VM to set up as an argument, so I’ve created a function to accept the argument:
Each time I open a terminal I can setup the environment:
If you only use one Docker VM for local development, you can hardcode the name of it to execute the command to automatically setup the docker environment when a new terminal is created.
Cleaning Out Docker Images
The last helpful alias I have comes from building and re-building containers that have left old images on my VM.
The docker-clean command cleans up all dangling images:
And running the docker-clean command yields:
I put all of these aliases and functions together in my ~/.bash_profile* script, which is executed anytime I open a terminal window:
*Note: Instead of putting these aliases and functions in ~/.bash_profile, other distributions would look for them in ~/.bashrc or ~/.bash_aliases to ensure they are available for all types of interactive shells.
If you have any other commands to simplify Docker interactions, please share them in the comments!
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