Usage without systemd¶
Our upstream packages use systemd integration, which is the recommended way to run kresd. This section is only relevant if you choose to use kresd without systemd integration.
Knot Resolver is designed to be a single process without the use of threads. While the cache is shared, the individual processes are independent. This approach has several benefits, but it also comes with a few downsides, in particular:
Without the use of threads or forking (deprecated, see #529), multiple processes aren’t managed in any way by kresd.
There is no maintenance thread and these tasks have to be handled by separate daemon(s) (such as Garbage Collector).
To offset these these disadvantages without implementing process management in kresd (and reinventing the wheel), Knot Resolver provides integration with systemd, which is widely used across GNU/Linux distributions.
If your use-case doesn’t support systemd (e.g. using macOS, FreeBSD, Docker, OpenWrt, Turris), this section describes the differences and things to keep in mind when configuring and running kresd without systemd integration.