Red Hat Bugzilla – Bug 178940
nscd: no more memory for database
Last modified: 2007-11-30 17:07:22 EST
# rpm -q nscd nscd-2.3.4-2.13 On a mailserver of ours, I'm seeing *lots* of Jan 24 21:29:00 mail nscd: 22890 no more memory for database 'hosts' in /var/log/messages over the past few days May be related to google search hit on same/similar error: http://sources.redhat.com/bugzilla/show_bug.cgi?id=1204 In the meantime, I've modified /etc/nscd.conf host section -suggested-size hosts 211 +suggested-size hosts 419 and issued /sbin/service nscd restart to see if that helps. Eerie output of nscd -g (note the high "memory allocation failed" count): ... hosts cache: yes cache is enabled yes cache is persistent yes cache is shared 211 suggested size 216064 total data pool size 12944 used data pool size 3600 seconds time to live for positive entries 20 seconds time to live for negative entries 4087 cache hits on positive entries 5837 cache hits on negative entries 202366 cache misses on positive entries 99294 cache misses on negative entries 3% cache hit rate 94 current number of cached values 1568 maximum number of cached values 20 maximum chain length searched 0 number of delays on rdlock 0 number of delays on wrlock 51264 memory allocations failed yes check /etc/hosts for changes
During periods where this error occurs, some samba shares exported from this same box become unresponsive/slow with (some?) windows clients receiving "delayed write failed" errors related to (op)locked files.
Hmm... my new 'suggested-size' didn't take until I cleared the db files in /var/db/nscd. Perhaps these db files should be cleared when the service is stopped.
Now, getting the same error for passwd too: Jan 26 05:16:27 xxx nscd: 14200 no more memory for database 'passwd' Jan 26 05:16:58 xxx nscd: 14200 no more memory for database 'passwd' Jan 26 05:17:31 xxx nscd: 14200 no more memory for database 'passwd'
If the database is persistent (as requested in the config file, RHEL4 default), then it of course should not be cleared. You need to /usr/sbin/nscd -i hosts -i passwd -i group it manually.
Are you suggesting that the /var/log/messages errors: Jan 24 21:29:00 mail nscd: 22890 no more memory for database 'hosts' and nscd -g output saying: 51264 memory allocations failed are by design and NOTABUG? (I seriously hope not)