Cyrus imap stops working

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Environment

SUSE Linux Enterprise Server 10

Situation

Cyrus Imapd stops working and messages similar to the ones below are present in /var/log/messages

Dec 11 08:58:24 helium lmtpunix[15428]: executed
Dec 11 08:58:24 helium lmtpunix[15428]: DBERROR db4: Logging region out of memory; you may need to increase itssize
Dec 11 08:58:24 helium lmtpunix[15428]: DBERROR: opening /var/lib/imap/deliver.db: Cannot allocate memory
Dec 11 08:58:24 helium lmtpunix[15428]: DBERROR: opening /var/lib/imap/deliver.db: cyrusdb error
Dec 11 08:58:24 helium lmtpunix[15428]: FATAL: lmtpd: unable to init duplicate delivery database

Resolution

The memory for the Berkeley DB logging region needs to be increased. In order to do this you have to create a file DB_CONFIG in the directory/var/lib/imap/db with the following line:

set_lg_regionmax 1048576

This sets the memory size for the logging region to 1MB. Afterwards the cyrus imap service needs to be stopped:

rccyrus stop

Next, the database needs to be adjusted:

db_stat -m -h /var/lib/imap/db

and then the cyrus service can be restarted:

rccyrus start

Additional Information

Also in order to improve the performance of cyrus (as described on http://cyrusimap.web.cmu.edu/imapd/install-perf.html) you may consider to add the following setting

set_cachesize 0 2097152 1

to the file DB_CONFIG. This sets the memory for the cache to 2MB.

Disclaimer

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