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Pierre Bonnat reported that SRV-based server-template recently stopped
to work properly.
After reviewing the changes, it was found that the regression was caused
by a4d04c6 ("BUG/MINOR: server: make sure the HMAINT state is part of MAINT")
Indeed, HMAINT is not a regular maintenance flag. It was implemented in
b418c122 a4d04c6 ("BUG/MINOR: server: make sure the HMAINT state is part
of MAINT"). This flag is only set (and never removed) when the server FQDN
is changed from its initial config-time value. This can happen with "set
server fqdn" command as well as SRV records updates from the DNS. This
flag should ideally belong to server flags.. but it was stored under
srv_admin enum because cur_admin is properly exported/imported via server
state-file while regular server's flags are not.
Due to a4d04c6, when a server FQDN changes, the server is considered in
maintenance, and since the HMAINT flag is never removed, the server is
stuck in maintenance.
To fix the issue, we partially revert a4d04c6. But this latter commit is
right on one point: HMAINT flag was way too confusing and mixed-up between
regular MAINT flags, thus there's nothing to blame about a4d04c6 as it was
error-prone anyway.. To prevent such kind of bugs from happening again,
let's rename HMAINT to something more explicit (SRV_ADMF_FQDN_CHANGED) and
make it stand out under srv_admin enum so we're not tempted to mix it with
regular maintenance flags anymore.
Since a4d04c6 was set to be backported in all versions, this patch must
be backported there as well.
(cherry picked from commit 85298189bf4c268b15c33aea95e0cc35113e25f0)
Signed-off-by: Aurelien DARRAGON <adarragon@haproxy.com>
2529cbc926