[Samba] URGENT CTDB: Which event scripts MUST be enable?
robert.buck at som.com
Tue Jan 12 14:20:35 UTC 2021
Very helpful. Thank you, Martin!
On Mon, Jan 11, 2021 at 9:21 PM Martin Schwenke <martin at meltin.net> wrote:
> Hi Bob,
> On Mon, 11 Jan 2021 18:18:05 -0500, Robert Buck via samba
> <samba at lists.samba.org> wrote:
> > We're using CTDB with winbind and samba.
> > What event scripts of these MUST be enabled?
> > # ctdb event script list legacy
> > 00.ctdb
> > 01.reclock
> > 05.system
> > 06.nfs
> > 10.interface
> > 11.natgw
> > 11.routing
> > 13.per_ip_routing
> > 20.multipathd
> > 31.clamd
> > 40.vsftpd
> > 41.httpd
> > ** 49.winbind* 50.samba*
> > 60.nfs
> > 70.iscsi
> > 91.lvs
> > Are we supposed to enable reclock, system, or ctdb?
> Since you're using winbindd and smbd you almost certainly want
> 49.winbind and 50.samba to be enabled. However, it is possible to
> start/stop/monitor these services using some other custom mechanism, so
> disabling them is not out of the question.
> * 00.ctdb is considered mandatory
> It does several things:
> - Checks for corrupt TDB files... so corrupt, volatile TDBs can be
> backed up for later analysis
> - Creates $CTDB_SCRIPT_VARDIR, which is used by other scripts to
> store state
> - Processes /etc/ctdb/ctdb.tunables (or similar)
> - Attaches ctdb.tdb, which is only current used by statd-callout,
> when using NFS
> The documentation clearly needs to be improved. :-(
> Both ctdb/wscript (used by "make install") and
> ctdb/packaging/RPM/ctdb.spec.in (may be used to build standalone RPM
> package(s)) attempt to ensure that this script is enabled.
> * 01.reclock is only really used to create the directory containing the
> recovery lock
> If you're using a helper (via "! ..." syntax) then you don't need
> The comment at the top of this script has bit-rotted. :-(
> 01.reclock is enabled by default at first-time install since we don't
> know how the recovery lock will be configured.
> * 05.system is used to monitor system resources
> If you have better resource monitoring in place then you can happily
> disable this script.
> 05.system is enabled by default at first-time install because
> we have seen many cases where performance issues and other issues
> have been reported, there is a resource problem on a node and the
> user is blissfully unaware... and blames CTDB for performing badly.
> The entire purpose of this script is for us to be able to look at
> someone's logs and say "performance was bad because you ran out of
> memory" or similar. ;-)
> * 10.interface is used to manage public IP addresses
> This monitors interfaces and, when directed by the daemon, "moves"
> public IP addresses
> I think that in a previous email you said that you are current unable
> to use CTDB's public IP addresses, so you probably don't need this.
> 10.interface is enabled by default at first-time install because we
> assume most people will use public IP addresses.
> peace & happiness,
SENIOR PLATFORM SOFTWARE ENGINEER
SKIDMORE, OWINGS & MERRILL
7 WORLD TRADE CENTER
250 GREENWICH STREET
NEW YORK, NY 10007
T (212) 298-9624
ROBERT.BUCK at SOM.COM
More information about the samba