No idea. Sorry.

Sounds like something is incorrect in your setup. Nothing Lemmy does requires x11, dbus, or any display technology.

It defaults to config.hjson. Check the defaults.hjson file for a full list of options including the pool_size variable.

It’s in the Lemmy configuration file.

It sets the maximum number of active sql connections Lemmy will use. Don’t set it higher than what your PostgreSQL server is able to handle.

The setting goes in your Lemmy configuration file. The same place as your database settings.

I don’t use docker, so I’m not sure what you need to do there. Sorry.

Sounds like you need to increase pool_size: 5 to a higher number in your Lemmy configuration.

Check the database pool_size variable in the Lemmy configuration.

Here’s how I do it. Might be worth giving it a shot. This is on FreeBSD, but I doubt that matters.

git clone https://github.com/LemmyNet/lemmy.git lemmy
cd lemmy
git checkout 0.17.3
git submodule init
git submodule update --recursive --remote
echo "pub const VERSION: &str = \"$(git describe --tag)\";" > "crates/utils/src/version.rs"
cargo build --release
strip target/release/lemmy_server

Then copy target/release/lemmy_server to wherever you want to run it.