Hello,
since a short time, my slapd crashes often.
I have two servers running in MM replication.
I use openldap version 2.4.30 (for updates are only dedicated timeslots...)
The loglevel is set to 256
I see some strange messages in my log before the slapd crashes:
"ch_realloc of 986032 bytes failed"
---
"ch_malloc of 294896 bytes failed"
---
"bdb(ou=root): txn_checkpoint: failed to flush the buffer cache:
Cannot allocate memory"
---
"ch_malloc of 34159 bytes failed"
What does they mean, how can I solve this problem
The System has 16GByte RAM, no other service is running there.
The Database size is about 1500000 entires and the size of the ldif is
about 2Gbyte
Because of the memory messages, I reduced the
cachesize 1000000
dncachesize 1000000
idlcachesize 3000000
to
cachesize 750000
dncachesize 750000
idlcachesize 2250000
but the problem exist still again.
I can't believe, that the memory is insufficient. Sysstat is running,
and I see enough cache memory (about 5GByte all time), and the Swap
(2GByte) is almost not used (about 2MByte).
vm.swappiness is set to default (60), so the Swap should used more
before the memory is running out.
OOM Kill is enabled via SYSRQ (signalling of processes), so slapd
should terminated by the kernel ...
My configuration:
== DB_CONFIG ==================================
set_cachesize 2 0 1
set_lg_regionmax 262144
set_lg_bsize 2097152
set_flags DB_LOG_AUTOREMOVE
== slapd.conf ==================================
include /etc/openldap/schema/core.schema
include /etc/openldap/schema/cosine.schema
include /etc/openldap/schema/inetorgperson.schema
include /etc/openldap/schema/yast.schema
include /etc/openldap/schema/rfc2307bis.schema
pidfile /var/run/slapd/slapd.pid
argsfile /var/run/slapd/slapd.args
modulepath /usr/lib/ldap
moduleload back_bdb
moduleload syncprov
moduleload back_monitor
sizelimit -1
timelimit 300
disallow bind_anon
require authc
gentlehup on
tool-threads 8
serverID <001|002>
database bdb
suffix "ou=demo"
rootdn "cn=admin"
directory /var/lib/ldap
loglevel 256
cachesize 750000
dncachesize 750000
idlcachesize 2250000
cachefree 500
dirtyread
dbnosync
shm_key 7
checkpoint 4096 15
index objectClass,entryUUID,entryCSN eq
index cn eq,sub
index ... own indexes
syncrepl rid=<001|002>
provider=ldap://master-<01|02>
type=refreshAndPersist
keepalive=360:10:5
retry="5 5 300 +"
searchbase="ou=demo"
attrs="*,+"
overlay syncprov
mirrormode TRUE
syncprov-checkpoint 100 5
database monitor
==========================================
(I know, dirtyread and dbnosync are not recommended..)
Additional I see messages like:
"bdb_idl_delete_key: c_del id failed: DB_LOCK_DEADLOCK: Locker killed
to resolve a deadlock (-30995)"
Should I care about it?
Thanks Meike
