Checkmk Werk 12699: Activate Livestatus TCP socket with systemd on recent enough systems

ID: 12699 Title: Activate Livestatus TCP socket with systemd on recent enough systems Component: Core & setup Level: 1 Class: New feature Version: 2.1.0i1 The Livestatus socket can be configured to be reachable over the network (details can be found under https://docs.checkmk.com/latest/en/livestatus.html#network). This is needed for, e.g., building distributed environments with Checkmk. In previous releases this network connection was managed by a site-specific xinetd instance. Since xinetd is not available on newer Linux distributions, we have added an alternative mode of managing the socket using systemd. All Checkmk sites on Linux distributions with a systemd version newer or equal to version 235 that have the LIVESTATUS_TCP option enabled (see abover for a link to the manual) automatically and seamlessly switch to the new systemd-managed socket after upgrading to Checkmk 2.1. Older Linux distributions keep using xinetd. Users are advised to double-check the systemd configuration under <tt>$OMD_ROOT/etc/mk-livestatus/livestatus.socket</tt> and <tt>$OMD_ROOT/etc/mk-livestatus/livestatus@.service</tt>.