[dm-devel] Chicken and egg problem with multipath-tools

[Bryn M. Reeves]

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On 03/03/2013 09:01 PM, Andrei B wrote:
> Well, that would be an idea. However, multipathd has the pidfile 
> hardcoded. It cannot be changed at runtime, nor can it be
> disabled.

It's not pretty but if you really want the daemon running this early
(most distros without /run don't bother) you can modify the init
script to mount some writable (e.g. ramfs/tmpfs) location over the top
of the read-only /var during start up.

E.g.:

mount -t ramfs none /var/run/

> I know, I could compile it with a different hardcoded path, but
> that's really a bad idea, because then if multipathd were to be
> restarted anytime later after boot, it would then fail because of
> the same reason.

Since the daemon only manages path monitoring and failback when paths
are down most distros that need to cope with read only /var (i.e.
pre-systemd and /run) do not start multipathd until later in the boot
process when /var has been made writable.

Regards,
Bryn.
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