[ClusterLabs] Issue with DRBD + a systemd resource

[Jan Pokorný]

On 14/12/17 10:49 -0500, Julien Semaan wrote:
> Great success!
> 
> Adding the following line to /usr/lib/systemd/system/pacemaker.service did
> it:
> After=dbus.service

Note, this is not a proper way for overriding the systemd unit files,
which is rather along the lines:
- make a copy to /etc/systemd/system directory
- edit this copy
- issue systemctl daemon-reload so that this is taken into at all
  (which also happens automatically after reboot)

Otherwise your changes are lost say after reinstalling pacemaker.

(FTR, in the same vein, I am proposing similar scheme for resource
agents: https://github.com/ClusterLabs/OCF-spec/issues/5)

> Now, the question is, should the unit file shipped in the RPM be adjusted
> (currently using CentOS 7), if so, is this the best place to get the message
> going, or should I post this to a specific BTS ?

Pacemaker maintainers are reading this so will take care of this
for upstream, you may then want to give a heads up to particular
downstream, giving them the right pointers.

Anyway, the change is seemingly straightfoward, but few things
should be answered/investigated first:
- After=dbus.service or rather After=dbus.socket (or both)?
- mere After=, or combined with other relationship modifying
  directives
  - Wants=, Requires= ... what's the expected behaviour when
    DBus crashes (or is it merely hypothetical because then
    whole systemd is in trouble then?)
  - should DBus reloads somehow affect pacemaker?
- (insert some other questions that are not currently
  coming to mind of rather inexpert person)

-- 
Jan (Poki)
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