installed new Dovecot 2.2 on Centos 7, and, migrated some users from old server

# dovecot --version 2.2.33.2 (d6601f4ec)

works OK, but, noticed some sql and index.cache errors

what am I missing ?

only noticed this one so far

# grep "Too many open files" /var/log/dovecot.log Jan 02 15:22:16 auth-worker(1411): Warning: mysql: Query failed, retrying: Got error 24 "Too many open files" from storage engine MyISAM Jan 02 15:22:16 auth-worker(1411): Error: sql(bb@tld.com.au,183.88.2.248,<VzebccNhtPO3WAL4>): User query failed: Got error 24 "Too many open files" from storage engine MyISAM

lots of this one

Jan 16 09:08:36 imap(postmaster@sbt.net.au): Error: mmap(size=263578648) failed with file //var/vmail/vmail1/sbt.net.au/postmaster@sbt.net.au//Maildir/dovecot.index.cache: Cannot allocate memory Jan 16 09:08:38 imap(postmaster@sbt.net.au): Error: mmap(size=263578648) failed with file //var/vmail/vmail1/sbt.net.au/postmaster@sbt.net.au//Maildir/dovecot.index.cache: Cannot allocate memory Jan 16 09:31:23 imap(postmaster@sbt.net.au): Error: mmap(size=263578648) failed with file //var/vmail/vmail1/sbt.net.au/postmaster@sbt.net.au//Maildir/dovecot.index.cache: Cannot allocate memory

MariaDB Network traffic since startup: 3.9 GiB This MySQL server has been running for 12 days, 3 hours, 1 minutes and 21 seconds. It started up on Jan 04, 2018 at 04:23 PM.

Traffic ø per hour Received 1.2 GiB 4.2 MiB Sent 2.7 GiB 9.5 MiB Total 3.9 GiB 13.7 MiB Connections ø per hour % max. concurrent connections 63 --- --- Failed attempts 51 0.18 <0.01% Aborted 809 2.78 0.07% Total 1,166 k 4,006.43 100.00%

Questions since startup: 9,850,430 ø per hour: 33,846 ø per minute: 564 ø per second: 9

-- Voytek