On May 7, 2009, at 9:50 PM, Mark Andrews wrote:
I beg to differ. Named only gets to this position in the
code if it has been told to shut itself down. Note this
may happen as a side effect of shutting the machine itself
down.
I can say with a lot of confidence, the machine is not being shut
down. Not 100% though, I will certainly look into improving that
percentage. I peeked in the logs for messages, wtmp, secure, and
boot, which did not yield anything that would lead me to think a
reboot was happening.
Could it be that if SBD/DLZ gets into bad shape, that is causing the
terminate?
I turned on mysql query logging and watched it for a while, seeing
three queries come in that were suspicious.
090508 3:09:34 24 Query SELECT zone FROM resource_records
WHERE zone = 'www.a.com'
24 Query SELECT zone FROM resource_records
WHERE zone = 'a.com'
24 Query SELECT zone FROM resource_records
WHERE zone = 'com'
That is the result of one dig:
dig www.a.com @ns1.example.com SOA
Taking the further, I made a more extreme test, which only moments
later, generated a core file, though this time, DNS managed to stay up
and answer questions...
* At some point in time later, queries will not get answers unless I
restart named-sdb manually.
* After this core was made, named-sdb is unable to answer queries, for
mysql driven data, or file based zones. However, named-sdb is still
running:
$ ps aux | grep named | grep -v grep
named 4918 0.0 0.1 199188 20528 ? Ssl 02:56 0:00 /usr/
sbin/named-sdb -u named
This one dig causes 26 total lookups, which is pretty strange in and
of itself.
dig a.b.c.d.e.f.g.h.i.j.k.l.m.n.o.p.q.r.s.t.u.v.w.x.y.z.com
@ns1.example.com SOA
SELECT zone FROM resource_records WHERE zone =
'a.b.c.d.e.f.g.h.i.j.k.l.m.n.o.p.q.r.s.t.u.v.w.x.y.z.com'
SELECT zone FROM resource_records WHERE zone =
'b.c.d.e.f.g.h.i.j.k.l.m.n.o.p.q.r.s.t.u.v.w.x.y.z.com'
SELECT zone FROM resource_records WHERE zone =
'c.d.e.f.g.h.i.j.k.l.m.n.o.p.q.r.s.t.u.v.w.x.y.z.com'
SELECT zone FROM resource_records WHERE zone =
'd.e.f.g.h.i.j.k.l.m.n.o.p.q.r.s.t.u.v.w.x.y.z.com'
SELECT zone FROM resource_records WHERE zone =
'e.f.g.h.i.j.k.l.m.n.o.p.q.r.s.t.u.v.w.x.y.z.com'
SELECT zone FROM resource_records WHERE zone =
'f.g.h.i.j.k.l.m.n.o.p.q.r.s.t.u.v.w.x.y.z.com'
SELECT zone FROM resource_records WHERE zone =
'g.h.i.j.k.l.m.n.o.p.q.r.s.t.u.v.w.x.y.z.com'
SELECT zone FROM resource_records WHERE zone =
'h.i.j.k.l.m.n.o.p.q.r.s.t.u.v.w.x.y.z.com'
SELECT zone FROM resource_records WHERE zone =
'i.j.k.l.m.n.o.p.q.r.s.t.u.v.w.x.y.z.com'
SELECT zone FROM resource_records WHERE zone =
'j.k.l.m.n.o.p.q.r.s.t.u.v.w.x.y.z.com'
SELECT zone FROM resource_records WHERE zone =
'k.l.m.n.o.p.q.r.s.t.u.v.w.x.y.z.com'
SELECT zone FROM resource_records WHERE zone =
'l.m.n.o.p.q.r.s.t.u.v.w.x.y.z.com'
SELECT zone FROM resource_records WHERE zone =
'm.n.o.p.q.r.s.t.u.v.w.x.y.z.com'
SELECT zone FROM resource_records WHERE zone =
'n.o.p.q.r.s.t.u.v.w.x.y.z.com'
SELECT zone FROM resource_records WHERE zone =
'o.p.q.r.s.t.u.v.w.x.y.z.com'
SELECT zone FROM resource_records WHERE zone =
'p.q.r.s.t.u.v.w.x.y.z.com'
SELECT zone FROM resource_records WHERE zone = 'q.r.s.t.u.v.w.x.y.z.com'
SELECT zone FROM resource_records WHERE zone = 'r.s.t.u.v.w.x.y.z.com'
SELECT zone FROM resource_records WHERE zone = 's.t.u.v.w.x.y.z.com'
SELECT zone FROM resource_records WHERE zone = 't.u.v.w.x.y.z.com'
SELECT zone FROM resource_records WHERE zone = 'u.v.w.x.y.z.com'
SELECT zone FROM resource_records WHERE zone = 'v.w.x.y.z.com'
SELECT zone FROM resource_records WHERE zone = 'w.x.y.z.com'
SELECT zone FROM resource_records WHERE zone = 'x.y.z.com'
SELECT zone FROM resource_records WHERE zone = 'y.z.com'
SELECT zone FROM resource_records WHERE zone = 'z.com'
SELECT zone FROM resource_records WHERE zone = 'com'
Thanks for your suggestions, I appreciate it. Has anyone else managed
to get mysql and named-sdb running solid on RHEL?
--
Scott * If you contact me off list replace talklists@ with scott@ *
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