this post was submitted on 07 Sep 2023
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43
How do YOU create your Docker images? (lemmy.ml)
submitted 1 year ago by [email protected] to c/selfhosted
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Currently I’m planning to dockerize some web applications but I didn’t find a reasonably easy way do create the images to be hosted in my repository so I can pull them on my server.

What I currently have is:

  1. A local computer with a directory where the application that I want to dockerize is located
  2. A “docker server” running Portainer without shell/ssh access
  3. A place where I can upload/host the Docker images and where I can pull the images from on the “Docker server”
  4. Basic knowledge on how to write the needed Dockerfile

What I now need is a sane way to build the images WITHOUT setting up a fully featured Docker environment on the local computer.

Ideally something where I can build the images and upload them but without that something “littering Docker-related files all over my system”.

Something like a VM that resets on every start maybe? So … build the image, upload to repository, close the terminal window, and forget that anything ever happened.

What is YOUR solution to create and upload Docker images in a clean and sane way?

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[–] [email protected] 10 points 1 year ago* (last edited 1 year ago) (3 children)

For the littering part, just type crontab -e and add the following line:

@daily docker system prune -a -f
[–] vegetaaaaaaa 2 points 1 year ago* (last edited 1 year ago) (1 children)

Careful this will also delete your unused volumes (not attached to a running container because it is stopped for whatever reason counts as unused). For this reason alone, always use bind mounts for volumes you care about.

[–] [email protected] 1 points 1 year ago

Yes.

All my self hosted containers are bound to some volume (since they require reading settings or databases).

[–] [email protected] 1 points 1 year ago* (last edited 1 year ago) (1 children)

as a user with root permission or as root ?

[–] [email protected] 8 points 1 year ago* (last edited 1 year ago) (1 children)

You shouldn't need sudo to run docker, just can create a docker group and add your user to it. This will give you the steps on how to run docker without sudo.

Edit: as pointed out below, please make sure that you're comfortable with giving these permissions to the user you're adding to the docker group.

[–] vegetaaaaaaa 3 points 1 year ago (1 children)

run docker without sudo.

Doing that, you effectively give the user account root access without password

docker run --volume /etc:/host_etc debian /bin/bash -> can read/write anything below the host's /etc directory, including shadow file, etc.

[–] [email protected] 2 points 1 year ago* (last edited 1 year ago)

True.

But I assume OP was already running docker from that user, so they are comfortable with those permissions.

Maybe should have made it clearer. Added to my other post. Thanks!

[–] Cyberflunk -1 points 1 year ago* (last edited 1 year ago) (1 children)

[–] [email protected] 3 points 1 year ago* (last edited 1 year ago) (2 children)

Genuinely curious, what would the advantages be?

Also, what if the Linux distro does not have systemd?

[–] Cyberflunk 1 points 1 year ago

I was just making a meme dude. Personally, I like systemd, it's more complicated to learn, I ended up reading books to really learn it properly. There's 100% nothing wrong with cron.

One of the reasons I like timers is journalctl integration. I can see everything in one place. Small thing.

[–] [email protected] 1 points 1 year ago

The chances I am going to manage a linux distro without systemd are low, but some systems (arch for example) don't have cron out of the box.

Not that big of a deal since it's easy to translate them all, but that's one of the reasons why I default to systemd/timer units.