I try to restart dovecot 2.2.24 (for changing limits) without killing all IMAP and POP3 sessions.
dovecot(1) tells me: When shutdown_clients is set to no, existing sessions will continue to use the old settings, after a dovecot reload. Also all sessions will keep alive after a dovecot stop. By default all active sessions will be shut down.
According to my "dovecot -n" (see below), I have set "shutdown_clients=no", so "doveadm stop" should keep my open sessions.
But if I try this out with a simple telnet to port 143 during "doveadm stop", I see the following:
$ telnet imap 143 Connected to imap. Escape character is '^]'.
- OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE AUTH=PLAIN AUTH=LOGIN] Dovecot ready. a login user@example.com XXXXX a OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE SORT SORT=DISPLAY THREAD=REFERENCES THREAD=REFS THREAD=ORDEREDSUBJECT MULTIAPPEND URL-PARTIAL CATENATE UNSELECT CHILDREN NAMESPACE UIDPLUS LIST-EXTENDED I18NLEVEL=1 CONDSTORE QRESYNC ESEARCH ESORT SEARCHRES WITHIN CONTEXT=SEARCH LIST-STATUS BINARY MOVE QUOTA ACL RIGHTS=texk] Logged in
- BYE Server shutting down. Connection closed by foreign host.
The "BYE Server shutting down." happens exactly at the time, when I press return after "doveadm stop", "systemctl stop dovecot", or "systemctl restart dovecot" in the other shell. Only "systemctl reload dovecot" keeps the open sessions healthy.
So it seems that either the man page is wrong, or shutdown_clients=no has no effect after dovecot stop...
Greetings Roland
dovecot -n
# 2.2.24 (a82c823): /etc/dovecot/dovecot.conf # Pigeonhole version 0.4.14 (099a97c) # OS: Linux 3.16.0-4-amd64 x86_64 Debian 8.5 auth_cache_negative_ttl = 5 mins auth_cache_size = 100 M auth_cache_ttl = 15 mins auth_default_realm = netcologne.de auth_master_user_separator = * auth_mechanisms = plain login auth_verbose = yes dict { acl = mysql:/etc/dovecot/dovecot-dict-sql.conf } disable_plaintext_auth = no listen = * log_timestamp = "%Y-%m-%d %H:%M:%S " mail_fsync = always mail_gid = 999 mail_location = maildir:~/mail mail_plugins = acl quota zlib mail_uid = 999 managesieve_notify_capability = mailto managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date index ihave duplicate mime foreverypart extracttext imapflags mmap_disable = yes namespace { list = children location = maildir:%%h/mail:INDEX=~/mail/shared/%%u prefix = shared/%%u/ separator = / subscriptions = no type = shared } namespace inbox { inbox = yes location = prefix = separator = / type = private } passdb { args = /etc/dovecot/passwd.master driver = passwd-file master = yes pass = yes } passdb { args = /etc/dovecot/dovecot-sql.conf driver = sql } plugin { acl = vfile acl_shared_dict = proxy::acl quota = maildir sieve = ~/.dovecot.sieve sieve_dir = ~/mail/sieve sieve_extensions = +imapflags zlib_save = gz } pop3_no_flag_updates = yes pop3_uidl_format = %v.%u protocols = imap pop3 sieve service auth { unix_listener auth-master { group = vmail mode = 0600 user = vmail } } service dict { unix_listener dict { group = vmail mode = 0600 user = vmail } } service imap { process_limit = 4000 } service managesieve-login { inet_listener sieve { port = 4190 } } service managesieve { process_limit = 100 } service pop3 { process_limit = 1000 } shutdown_clients = no ssl = no syslog_facility = local2 userdb { args = /etc/dovecot/dovecot-sql.conf driver = sql } verbose_proctitle = yes protocol imap { mail_max_userip_connections = 10 mail_plugins = acl quota zlib imap_quota imap_acl } protocol pop3 { mail_plugins = acl quota zlib }