55 lines
2.5 KiB
Markdown
55 lines
2.5 KiB
Markdown
Official service files for systemd
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==================================
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This folder contains the officially-maintained systemd files that should be used as a basis for your own deployments.
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**⚠️ Always review your service file before using it! Change anything that you need to customize.**
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## Instructions
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See our website for [installation instructions](https://caddyserver.com/docs/install).
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## Prerequisites
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Running Caddy as a systemd service requires the following:
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Group named `caddy`:
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```bash
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$ groupadd --system caddy
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```
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User named `caddy` with a writeable home folder:
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```bash
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$ useradd --system \
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--gid caddy \
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--create-home \
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--home-dir /var/lib/caddy \
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--shell /usr/sbin/nologin \
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--comment "Caddy web server" \
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caddy
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```
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## Choosing a service file
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- **`caddy.service`** - Use this one if you configure Caddy with a file (for example, the Caddyfile, or a .json file).
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- **`caddy-api.service`** - Use this one if you configure Caddy solely through its API.
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The two files are identical except for the ExecStart and ExecReload commands.
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## Important
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Caddy receives all configuration through its [admin API](https://caddyserver.com/docs/api), even when the [command line interface (CLI)](https://caddyserver.com/docs/command-line) is used, which simply wraps up the API calls for you.
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Most users will use either config files and the CLI [mutually exclusively](https://caddyserver.com/docs/getting-started#api-vs-config-files) with the API because it is simpler to have only one source of truth. However, you may wish to provide Caddy an initial "bootstrapping" configuration with a config file, and use the API thereafter.
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**⚠️ If you provide an initial config file with the `--config` flag and then update the config using the API, you risk losing your changes if the service is restarted unless you have the `--resume` flag in your ExecStart command.**
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Without the `--resume` flag, the `--config` flag will overwrite any last-known configuration.
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However, it is totally safe and normal to use both the `--config` and `--resume` options together if you need to use both a config file and the API. Just be aware that if you update your config file and want to apply those changes, _stopping and starting the server is the wrong way to do this_. Restarting the service is orthogonal to config changes; this is a unique safety feature that guarantees durability and prevents data loss. If the config file has the latest changes, you should use the reload command instead.
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