I’m moving to a new machine soon and want to re-evaluate some security practices while I’m doing it. My current server is debian with all apps containerized in docker with root. I’d like to harden some stuff, especially vaultwarden but I’m concerned about transitioning to podman while using complex docker setups like nextcloud-aio. Do you have experience hardening your containers by switching? Is it worth it? How long is a piece of string?
Rootless Podman :) It requires you to learn a little bit of new syntax, for example, the way you mount volumes and pass environment variables can be slightly different, but there’s nothing that hasn’t worked for me.
I’m using this on uBlue uCore, which I would also strongly recommend for security reasons.
Can you expand on why you chose uCore? I was considering CoreOS until just now
and the idea of setting up ignition config serving seems overkill for running only one server at home.ignition is still required the same way as CoreOSMainly for security. I was originally looking at CoreOS but I liked the additional improvements by the UBlue team. Since I only want it to run containers, it is a huge security benefit to be immutable and designed specifically for that workflow.
The Ignition file is super easy to do, even for just one server (substitute
dockerforpodmandepending which you have):Take a copy of the UCore butane file:
https://github.com/ublue-os/ucore/blob/main/examples/ucore-autorebase.butane
Update it with your SSH public key and a password hash by using this command:
# Get a password hash podman run -ti --rm quay.io/coreos/mkpasswd --method=yescryptThen host the butane file in a temporary local webserver:
# Convert Butane file to Ignition file podman run -i --rm quay.io/coreos/butane:release --pretty --strict < ucore-autorebase.butane > ignition.ign # Serve the Igition file using a temp webserver podman run -p 5080:80 -v "$PWD":/var/www/html php:7.2-apacheDuring UCore setup, type in the address of the hosted file, e.g.
http://your_ip_addr:5080/ignition.ignThat’s it - UCore configures everything else during setup.___