Current option `-f` allows users to run multiple kresd instances at once. That is good in theory has many shortcomings, namely: - parent kresd process does not monitor child processes - processes cannot be re/started without breaking kresd inter-process communication - current implementation of `map()` command has convoluted error handling (and is error prone) - it is harder to monitor processes from outside, e.g. using standard tools in systemd - forking and file descriptor passing between instances is a mess Fixing these shortcomings is of course possible, but it ultimately leads to re-implementation of supervisor process, which is even worse idea. We already have systemd/supervisord/procd for this task so let's rely on that instead of re-inventing wheel. Proposal: - deprecate `-f` option and `map()` command in 5.0.0 - add warning if `-f` or `map()` are used - add new option `-n`/`--noninteractive` which should be used instead of `-f 1` - update manuals to use new option `-n` + systemd instances to run multiple processes Wild idea: - update `map()` command to use sockets in `rundir` instead of FDs inherited from parent? Is it worth the complexity?