1MASTER(8) Cyrus IMAP MASTER(8)
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6 master - Cyrus IMAP documentation
7 The Cyrus IMAP master process.
9
11 master [ -C config-file ] [ -M alternate cyrus.conf ]
12 [ -l listen queue ] [ -p pidfile ]
13 [ -j janitor period ] [ -d | -D ] [ -L logfile ]
14
16 master is the process that controls all of the Cyrus processes. This
17 process is responsible for creating all imapd, pop3d, lmtpd and tim‐
18 sieved child processes. This process also performs scheduled
19 cleanup/maintenance.
20 If this process dies, then no new sessions will be started.
22 It kills itself and all child processes when it receives a SIGTERM.
24 master reads its configuration options out of the imapd.conf(5) file
26 unless specified otherwise by -C.
27
29 -C alternate imapd.conf
30 Use the specified configuration file config-file rather than the
31 default imapd.conf(5).
32 -M alternate cyrus.conf
34 Specifies an alternate cyrus.conf for use by master.
35 -l listen queue backlog
37 Increase the listen queue backlog. By default, the listen queue
38 is set to 32. On systems with a high connection rate, it may
39 be desirable to increase this value. refer to listen(2) for de‐
40 tails.
41 -j janitor full-sweeps per second
43 Sets the number of times per second the janitor should sweep the
44 entire child table. Leave it at the default of 1 unless you
45 have a really high fork rate (and you have not increased the
46 child hash table size when you compiled Cyrus from its default
47 of 10000 entries).
48 -p pidfile
50 Use pidfile as the pidfile. If not specified, defaults to
51 /var/run/master.pid
52 -d Start in daemon mode (run in background and disconnect from con‐
54 trolling terminal).
55 -D Don’t close stdin/stdout/stderr. Primarily useful for debugging.
57 Note that -d and -D cannot be used together; consider using -L
58 instead.
59 -L logfile
61 Redirect stdout and stderr to the given logfile.
62
64 Upon execution, master reads its configuration information out of the
65 cyrus.conf(5) file, or an alternative if -M is used.
66 master rereads its configuration file when it receives a hangup signal,
68 SIGHUP. Services and events may be added, deleted or modified when the
69 configuration file is reread. Any active services removed from the
70 configuration file will be allowed to run until completion. Services
71 added or modified to listen on a privileged port may not be able to
72 bind the port, depending on your system configuration. In this case a
73 full restart is needed.
74 master propagates the hangup signal, SIGHUP, to its child service pro‐
76 cesses, so that they stop waiting for incoming connections and exit,
77 allowing them to be recycled. This is useful to make services take
78 into account a new version of the imapd.conf(5) file. Children that
79 are servicing a client connection when SIGHUP is received are allowed
80 to run until the client logouts before being recycled. It may take a
81 long time until the client logouts, so a log message is generated for
82 processes that have not been recycled within 30s.
83
85 The environment variable CYRUS_VERBOSE can be set to log additional de‐
86 bugging information. Setting the value to 1 results in base level log‐
87 ging. Setting it higher results in more log messages being generated.
88
90 /etc/cyrus.conf, /etc/imapd.conf, /var/run/master.pid
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93 cyrus.conf(5), imapd.conf(5), imapd(8), pop3d(8), lmtpd(8), tim‐
94 sieved(8), idled(8)
95
97 The Cyrus Team, Nic Bernstein (Onlight)
98
100 1993–2022, The Cyrus Team
1013.6.0 December 12, 2022 MASTER(8)