IMAP hibernate feature committed
Thomas Leuxner
tlx at leuxner.net
Wed Aug 26 10:33:38 UTC 2015
* Timo Sirainen <tss at iki.fi> 2015.08.25 22:21:
> There's no good default setting here. It depends on your userdb settings and/or mail_uid setting. So for example if your imap processes are running as vmail user, you should set service imap-hibernate { unix_listener imap-hibernate { user = vmail } }. Then again if you are using system users (or otherwise multiple UIDs) it gets more difficult to implement this securely (mode=0666 works always, but security isn't too good). This same problem exists for various other parts of Dovecot, for example indexer-worker and dict services.
I have it working (I guess) with these user settings (virtual users using 'vmail'):
service imap-hibernate {
unix_listener imap-hibernate {
user = vmail
}
}
I had to assign the imap-master socket the user the imap-hibernate process is using to avoid messages like this:
Aug 25 23:16:02 nihlus dovecot: imap-hibernate(tlx at leuxner.net): Error: net_connect_unix(/var/run/dovecot/imap-master) failed: Permission denied
Aug 25 23:16:02 nihlus dovecot: imap-hibernate(tlx at leuxner.net): Failed to connect to master socket in=126 out=944 hdr=0 body=0 del=0 exp=0 trash=0
service imap {
unix_listener imap-master {
user = dovecot
}
}
With this I see messages like this in the logs:
Aug 26 09:48:06 nihlus dovecot: imap-hibernate(tlx at leuxner.net): Connection closed in=189 out=4252 hdr=0 body=0 del=0 exp=0 trash=0
Aug 26 12:20:29 nihlus dovecot: imap-hibernate(tlx at leuxner.net): Connection closed in=109 out=4714 hdr=0 body=0 del=0 exp=0 trash=0
I'm a bit puzzled as to when hibernate actually kicks in because most of the time I see normal imap processes running without them being hibernated:
$ ps aux | grep dovecot/imap
dovenull 6791 0.0 0.0 18196 4772 ? S 06:39 0:00 dovecot/imap-login
dovenull 7107 0.0 0.0 18196 4736 ? S 08:00 0:00 dovecot/imap-login
dovenull 7112 0.0 0.0 18332 4492 ? S 08:00 0:00 dovecot/imap-login
dovenull 7333 0.0 0.0 18332 4772 ? S 08:45 0:00 dovecot/imap-login
dovenull 7675 0.0 0.0 18196 4628 ? S 10:13 0:00 dovecot/imap-login
dovenull 7677 0.0 0.0 18332 4532 ? S 10:14 0:00 dovecot/imap-login
dovenull 7821 0.0 0.0 18196 4532 ? S 10:44 0:00 dovecot/imap-login
dovenull 8156 0.0 0.0 18196 4756 ? S 12:01 0:00 dovecot/imap-login
vmail 8157 0.0 0.0 45624 9608 ? S 12:01 0:00 dovecot/imap
dovenull 8158 0.0 0.0 18332 4628 ? S 12:01 0:00 dovecot/imap-login
vmail 8159 0.0 0.0 44772 9256 ? S 12:01 0:00 dovecot/imap
dovenull 8160 0.0 0.0 18196 4652 ? S 12:01 0:00 dovecot/imap-login
vmail 8161 0.0 0.0 46072 9760 ? S 12:01 0:00 dovecot/imap
dovenull 8162 0.0 0.0 18196 4548 ? S 12:01 0:00 dovecot/imap-login
dovenull 8279 0.0 0.0 18332 4736 ? S 12:22 0:00 dovecot/imap-login
vmail 8280 0.0 0.0 40712 5164 ? S 12:22 0:00 dovecot/imap
dovenull 8341 0.0 0.0 18196 4740 ? S 12:25 0:00 dovecot/imap-login
vmail 8344 0.0 0.0 46312 10568 ? S 12:25 0:00 dovecot/imap
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