On Thu, 8 Aug 2019 11:50:07 -0400, Michael Stone <mst...@debian.org> wrote: >On Thu, Aug 08, 2019 at 11:41:52AM -0400, Marvin Renich wrote: >>* Michael Stone <mst...@debian.org> [190808 08:42]: >>> On Thu, Aug 08, 2019 at 08:37:16AM -0400, Marvin Renich wrote: >>> > Does anyone know what applications use this file for what purpose? Is >>> > this a systemd-ism? >>> >>> man machine-id >> >>The man page says what it is (a unique, random ID for the machine) and >>how to initialize it, but says nothing about why it exists. What >>applications expect it to be there? > >>From the man page: > > The machine ID does not change based on local or network configuration > or when hardware is replaced. Due to this and its greater length, it > is a more useful replacement for the gethostid(3) call that POSIX > specifies. >[...] > When a machine is booted with systemd(1) the ID of the machine will be > established. If systemd.machine_id= or --machine-id= options (see > first section) are specified, this value will be used. Otherwise, the > value in /etc/machine-id will be used. If this file is empty or > missing, systemd will attempt to use the D-Bus machine ID from > /var/lib/dbus/machine-id, the value of the kernel command line option > container_uuid, the KVM DMI product_uuid (on KVM systems), and finally > a randomly generated UUID.
What Marvin says: That doesn't explain anything. I have, btw, just learned that systemd-networkd won't even attempt to bring up your network if /etc/machine-id doesn't exist. duh. Greetings Marc -- -------------------------------------- !! No courtesy copies, please !! ----- Marc Haber | " Questions are the | Mailadresse im Header Mannheim, Germany | Beginning of Wisdom " | Nordisch by Nature | Lt. Worf, TNG "Rightful Heir" | Fon: *49 621 72739834
