Fix: Cyrus-IMAP Logging region out of memory cirus imap

I found out that the Cyrus-IMAP’s database is flagging with errors as below:

[root@mail ~]# tail -n 100 -f /var/log/maillog

Mar 24 10:36:14 mail lmtpunix[4017]: executed
Mar 24 10:36:14 mail lmtpunix[4017]: DBERROR db4: Logging region out of memory; you may need to increase its size
Mar 24 10:36:14 mail lmtpunix[4017]: DBERROR: opening /var/lib/imap/deliver.db: Cannot allocate memory
Mar 24 10:36:14 mail lmtpunix[4017]: DBERROR: opening /var/lib/imap/deliver.db: cyrusdb error
Mar 24 10:36:14 mail lmtpunix[4017]: FATAL: lmtpd: unable to init duplicate delivery database
Mar 24 10:36:14 mail master[4664]: process 4017 exited, status 75
Mar 24 10:36:14 mail master[4664]: service lmtpunix pid 4017 in READY state: terminated abnormally
Mar 24 10:36:14 mail master[4018]: about to exec /usr/lib/cyrus-imapd/lmtpd

It turned out that the Cyrus-IMAP service runs out of log memory. So here comes the need to change the default setting and create a bigger cache and log memory regions of Cyrus-IMAP’s database as documented below.

Changing the default Logging region of Cyrus-IMAP servers database is easy.

Create a DB_CONFIG file is you have not done it yet.

[root@mail ~]# /etc/init.d/cyrus-imapd stop

Backup the database to be recovered.

[root@mail ~]# rsync -auvp /var/lib/imap/db /root/db_backup.date

Recover the database that was changed.

[root@mail ~]# db_recover -h /var/lib/imap/db

Once the command above is successfully done, we can now start the Cyrus-IMAP service.

[root@mail ~]# /etc/init.d/cyrus-imapd start

Check the new cache and memory statitics and wether the new settings are set correctly.

[root@mail ~]# db_stat -h /var/lib/imap/db -m

[root@mail ~]# db_stat -h /var/lib/imap/db -l