Podman finally works with docker-compose
Hello, I’m Kristof, a human being like you, and an easy to work with, friendly guy.
I've been a programmer, a consultant, CIO in startups, head of software development in government, and built two software companies.
Some days I’m coding Golang in the guts of a system and other days I'm wearing a suit to help clients with their devops practices.
One of the big pains of
podman was that while it replaces
docker, nobody actually uses
docker standalone -- everyone uses (at least)
docker-compose.yml, because it's incredibly rare that you don't need at least a DB for any app too.
Since Ubuntu 22.04,
podman can now work nicely with
docker-compose. On Ubuntu 22.04, where I tested it, the following steps were necessary to set it up properly:
First, install the packages (running as
apt install -y podman-docker docker-compose
Then, at least on
lxd containers, this was needed to avoid a "
storage driver overlay failed: kernel does not support overlay fs: 'overlay' is not supported over extfs at "/var/lib/containers/storage/overlay": backing file system is unsupported for this graph driver" error:
cat >>/etc/containers/storage.conf <<EOF [storage] driver = "overlay" [storage.options] mount_program = "/usr/bin/fuse-overlayfs" EOF
For some reason (khm RedHat khm),
podman is not set up to use the docker hub registry by default, so we have to add it manually:
echo 'unqualified-search-registries = ["docker.io"]' >>/etc/containers/registries.conf
Finally, to play nicely with
docker-compose, we need to start the simulated
systemctl start podman.socket
This actually enabled to all
docker-compose.yml I had lying around to work with
We can argue about
docker (I'm actually not a big podman fan as of 2022), but before making it work with
podman was nearly unusable for us.