README: Document the build process, add systemd service

Fixes #269.

README.md

@@ -163,6 +163,20 @@ front-end.
 
 ### From source
 
+To compile the project, you'll need:
+
+* npm, curl: `sudo apt install curl npm`
+* Rust/Cargo: [rustup.rs](https://rustup.rs/)
+
+Then you can compile the server (and the migration tool if you want):
+
+```shell
+cargo build --release -p lldap -p migration-tool
+```
+
+The resulting binaries will be in `./target/release/`. Alternatively, you can
+just run `cargo run -- run` to run the server.
+
 To bring up the server, you'll need to compile the frontend. In addition to
 cargo, you'll need:
 
@@ -172,10 +186,13 @@ cargo, you'll need:
 Then you can build the frontend files with `./app/build.sh` (you'll need to run
 this after every front-end change to update the WASM package served).
 
-To bring up the server, just run `cargo run`. The default config is in
+The default config is in `src/infra/configuration.rs`, but you can override it
-`src/infra/configuration.rs`, but you can override it by creating an
+by creating an `lldap_config.toml`, setting environment variables or passing
-`lldap_config.toml`, setting environment variables or passing arguments to
+arguments to `cargo run`. Have a look at the docker template:
-`cargo run`.
+`lldap_config.docker_template.toml`.
+
+You can also install it as a systemd service, see
+[lldap.service](example_configs/lldap.service).
 
 ### Cross-compilation
 

example_configs/lldap.service

@@ -0,0 +1,22 @@
+[Unit]
+Description=Nitnelave LLDAP
+Documentation=https://github.com/nitnelave/lldap
+
+# Only sqlite
+After=network.target
+
+[Service]
+# The user/group LLDAP is run under. The working directory (see below) should allow write and read access to this user/group.
+User=root
+Group=root
+
+# The location of the compiled binary
+ExecStart=/opt/nitnelave/lldap \
+  run
+
+# Only allow writes to the following directory and set it to the working directory (user and password data are stored here).
+WorkingDirectory=/opt/nitnelave/
+ReadWriteDirectories=/opt/nitnelave/
+
+[Install]
+WantedBy=multi-user.target