[Dovecot] TIMO HELP! director ring wont stay connected

Kelsey Cummings kgc at corp.sonic.net
Mon Sep 3 21:26:55 EEST 2012 

I've had 2x director ring up and running with production load on 2.1.8 
with around 10,000 active connections for two weeks and everything has 
been working great - until this morning.

There isn't anything obvious in the logs beyond the fact that the 
director connections started bouncing.  It was not resolved by reloads 
or restarts or an upgrade to 2.1.9 (only the directors.)

I've dropped one of the servers out of the ring to prevent suffering but 
this is a less than ideal situation.

Any idea what is going on?  Load today is consistent with low weekend 
load since it is a major US holiday so this wouldn't appear to be a load 
related issue.

auth_master_user_separator = *
auth_username_format = %Ln
auth_verbose = yes
default_client_limit = 10000
director_mail_servers = 1.1.1.1 1.1.1.2 1.1.1.3 1.1.1.4
director_servers = a.director.foo b.director.foo
disable_plaintext_auth = no
doveadm_proxy_port = 1842
login_trusted_networks = 10.0.0.1
mbox_write_locks = fcntl
passdb {
   args = /etc/dovecot/master-users
   driver = passwd-file
   master = yes
   pass = yes
}
passdb {
   args = proxy=y nopassword=y
   driver = static
}
service anvil {
   client_limit = 20103
}
service auth {
   client_limit = 41704
}
service director {
   fifo_listener login/proxy-notify {
     mode = 0666
   }
   inet_listener {
     port = 9321
   }
   unix_listener login/director {
     mode = 0666
   }
}
service imap-login {
   executable = imap-login director
   process_limit = 20000
   process_min_avail = 32
}
service imap {
   process_limit = 20480
}
service pop3-login {
   executable = pop3-login director
   process_limit = 20000
   process_min_avail = 32
}
ssl_ca = </etc/dovecot/ssl/gd_bundle.crt
ssl_cert = </etc/dovecot/ssl/imap.sonic.net.crt
ssl_key = </etc/dovecot/ssl/imap.sonic.net.key
ssl_parameters_regenerate = 1 days
syslog_facility = local0
protocol imap {
   ssl_ca = </etc/dovecot/ssl/gd_bundle.crt
   ssl_cert = </etc/dovecot/ssl/imap.sonic.net.crt
   ssl_key = </etc/dovecot/ssl/imap.sonic.net.key
}
protocol pop3 {
   ssl_ca = </etc/dovecot/ssl/pop.sonic.net.ca-bundle
   ssl_cert = </etc/dovecot/ssl/pop.sonic.net.crt
   ssl_key = </etc/dovecot/ssl/pop.sonic.net.key
}

 >Sep  3 09:22:42 b.director. b dovecot: director: Error: Director 
10.10.10.71:9321/right disconnected
 >Sep  3 09:22:45 a.director. a dovecot: director: Error: Director 
10.10.10.37:9321/left disconnected
 >Sep  3 09:22:49 b.director. b dovecot: director: Error: Director 
10.10.10.71:9321/left disconnected
 >Sep  3 09:22:53 b.director. b dovecot: director: Error: Director 
10.10.10.71:9321/left disconnected
 >Sep  3 09:22:54 a.director. a dovecot: director: Error: Director 
10.10.10.37:9321/left disconnected
 >Sep  3 09:22:59 b.director. b dovecot: director: Error: Director 
10.10.10.71:9321/left disconnected
 >Sep  3 09:23:02 a.director. a dovecot: director: Error: Director 
10.10.10.37:9321/right disconnected
 >Sep  3 09:23:02 a.director. a dovecot: director: Warning: director: 
Couldn't connect to right side, we must be the only director left
 >Sep  3 09:23:02 b.director. b dovecot: director: Error: Director 
10.10.10.71:9321/right disconnected
 >Sep  3 09:23:02 b.director. b dovecot: director: Warning: director: 
Couldn't connect to right side, we must be the only director left
 >Sep  3 09:23:32 a.director. a dovecot: director: Error: director: User 
foo host lookup failed: Timeout - queued for 47 secs (Ring synced for 30 
secs, weak user, user refreshed 47 secs ago)
 >Sep  3 09:23:32 a.director. a dovecot: director: Error: director: User 
bar host lookup failed: Timeout - queued for 38 secs (Ring synced for 30 
secs, weak user, user refreshed 38 secs ago)
 >Sep  3 09:23:32 a.director. a dovecot: director: Error: director: User 
bla host lookup failed: Timeout - queued for 30 secs (Ring synced for 30 
secs)
 >Sep  3 09:23:32 a.director. a dovecot: director: Error: director: User 
bla2 host lookup failed: Timeout - queued for 30 secs (Ring synced for 
30 secs)
 >Sep  3 09:23:32 a.director. a dovecot: director: Error: Director 
10.10.10.37:9321/right disconnected
 >Sep  3 09:23:32 a.director. a dovecot: director: Warning: director: 
Couldn't connect to right side, we must be the only director left
 >Sep  3 09:23:32 a.director. a dovecot: director: Warning: director: 
Couldn't connect to right side, we must be the only director left
 >Sep  3 09:23:32 b.director. b dovecot: director: Error: Director 
10.10.10.71:9321/out disconnected before handshake finished
 >Sep  3 09:23:32 b.director. b dovecot: director: Warning: director: 
Couldn't connect to right side, we must be the only director left
 >Sep  3 09:24:02 b.director. b dovecot: director: Error: Director 
10.10.10.71:9321/out disconnected before handshake finished
 >Sep  3 09:24:02 b.director. b dovecot: director: Warning: director: 
Couldn't connect to right side, we must be the only director left
 >Sep  3 09:24:05 a.director. a dovecot: director: Warning: Delaying new 
user requests until ring is synced
 >Sep  3 09:24:32 a.director. a dovecot: director: Warning: Ring is 
synced, continuing delayed requests
 >Sep  3 09:24:41 b.director. b dovecot: director: Error: Director 
10.10.10.71:9321/right disconnected
 >Sep  3 09:24:41 b.director. b dovecot: director: Warning: director: 
Couldn't connect to right side, we must be the only director left
 >Sep  3 09:24:41 a.director. a dovecot: director: Error: Director 
10.10.10.37:9321/right disconnected
 >Sep  3 09:24:41 a.director. a dovecot: director: Warning: director: 
Couldn't connect to right side, we must be the only director left
 >Sep  3 09:25:11 b.director. b dovecot: director: Error: User hash 
2285697953 is being redirected to two hosts: 10.10.10.39 and 10.10.10.76 
(old_ts=1346689481,handshaking,recv_ts=1346689467)
 >Sep  3 09:25:12 b.director. b dovecot: director: Error: User hash 
623192092 is being redirected to two hosts: 10.10.10.76 and 10.10.10.39 
(old_ts=1346689481,handshaking,recv_ts=1346689468)
 >Sep  3 09:25:12 b.director. b dovecot: director: Error: User hash 
1683990717 is being redirected to two hosts: 10.10.10.43 and 10.10.10.76 
(old_ts=1346689481,handshaking,recv_ts=1346689468)
 >Sep  3 09:25:12 a.director. a dovecot: director: Error: Director 
10.10.10.37:9321/right disconnected
 >Sep  3 09:25:12 a.director. a dovecot: director: Warning: director: 
Couldn't connect to right side, we must be the only director lef




-- 
Kelsey Cummings - kgc at corp.sonic.net      sonic.net, inc.
System Architect                          2260 Apollo Way
707.522.1000                              Santa Rosa, CA 95407

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