Provided by: public-inbox_1.9.0-1_all 
NAME
public-inbox-daemon - common usage for public-inbox network daemons
SYNOPSIS
public-inbox-netd
public-inbox-httpd
public-inbox-imapd
public-inbox-nntpd
public-inbox-pop3d
DESCRIPTION
This manual describes common options and behavior for public-inbox network daemons. Network daemons for
public-inbox provide read-only IMAP, HTTP, NNTP and POP3 access to public-inboxes. Write access to a
public-inbox will never be required to run these.
These daemons are implemented with a common core using non-blocking sockets and optimized for fairness;
even with thousands of connected clients over slow links.
They also provide graceful shutdown/upgrade support to avoid breaking existing connections during
software upgrades.
These daemons may also utilize multiple pre-forked worker processes to take advantage of multiple CPUs.
OPTIONS
-l [PROTOCOL://]ADDRESS[?opt1=val1,opt2=val2]
--listen [PROTOCOL://]ADDRESS[?opt1=val1,opt2=val2]
This takes an absolute path to a Unix socket or HOST:PORT to listen on. For example, to listen to
TCP connections on port 119, use: "-l 0.0.0.0:119". This may also point to a Unix socket ("-l
/path/to/http.sock") for a reverse proxy like nginx(8) to use.
May be specified multiple times to allow listening on multiple sockets.
Unless per-listener options are used (required for public-inbox-netd(1)), this does not need to be
specified at all if relying on systemd.socket(5) or similar,
Per-listener options may be specified after "?" as "KEY=VALUE" pairs delimited by ",". See
public-inbox-netd(1) for documentation on the "cert=", "key=", "env.NAME=VALUE", "out=", "err=", and
"psgi=" options available.
Default: server-dependent unless socket activation is used with systemd(1) or similar (see
systemd.socket(5)).
-1
--stdout PATH
Specify an appendable path to redirect stdout descriptor (1) to. Using this is preferable to setting
up the redirect externally (e.g. >>/path/to/log in shell) since it allows SIGUSR1 to be handled (see
"SIGNALS" in SIGNALS below).
"out=" may also be specified on a per-listener basis.
Default: /dev/null with "--daemonize", inherited otherwise
-2 PATH
--stderr PATH
Like "--stdout", but for the stderr descriptor (2).
"err=" may also be specified on a per-listener basis.
Default: /dev/null with "--daemonize", inherited otherwise
-W
--worker-processes
Set the number of worker processes.
Normally, this should match the number of CPUs on the system to take full advantage of the hardware.
However, users of memory-constrained systems may want to lower this.
Setting this to zero ("-W0") disables the master/worker split; saving some memory but removing the
ability to use SIGTTIN to increase worker processes or have the worker restarted by the master on
crashes.
Default: 1
--cert /path/to/cert
The default TLS certificate for HTTPS, IMAPS, NNTPS, POP3S and/or STARTTLS support if the "cert"
option is not given with "--listen".
Well-known TCP ports automatically get TLS or STARTTLS support If using systemd-compatible socket
activation and a TCP listener on port well-known ports (563 is inherited, it is automatically NNTPS
when this option is given. When a listener on port 119 is inherited and this option is given, it
automatically gets STARTTLS support.
--key /path/to/key
The default TLS certificate key for the default "--cert" or per-listener "cert=" option. The private
key may be concatenated into the path used by the cert, in which case this option is not needed.
SIGNALS
Most of our signal handling behavior is copied from nginx(8) and/or starman(1); so it is possible to
reuse common scripts for managing them.
SIGUSR1 Reopens log files pointed to by --stdout and --stderr options.
SIGUSR2 Spawn a new process with the intention to replace the running one. See "UPGRADING" below.
SIGHUP Reload config files associated with the process. (Note: broken for public-inbox-httpd(1) only in
<= 1.6)
SIGTTIN Increase the number of running workers processes by one.
SIGTTOU Decrease the number of running worker processes by one.
SIGWINCH
Stop all running worker processes. SIGHUP or SIGTTIN may be used to restart workers.
SIGQUIT Gracefully terminate the running process.
SIGTTOU, SIGTTIN, SIGWINCH all have no effect when worker processes are disabled with "-W0" on the
command-line.
ENVIRONMENT
PI_CONFIG
The default config file, normally "~/.public-inbox/config". See public-inbox-config(5)
LISTEN_FDS, LISTEN_PID
Used by systemd (and compatible) installations for socket activation. See systemd.socket(5) and
sd_listen_fds(3).
PERL_INLINE_DIRECTORY
Pointing this to point to a writable directory enables the use of Inline and Inline::C extensions
which may provide platform-specific performance improvements. Currently, this enables the use of
vfork(2) which speeds up subprocess spawning with the Linux kernel.
public-inbox will never enable Inline::C automatically without this environment variable set or
"~/.cache/public-inbox/inline-c" created by a user. See Inline and Inline::C for more details.
UPGRADING
There are two ways to upgrade a running process.
Users of process management systems with socket activation (systemd(1) or similar) may rely on multiple
instances For systemd, this means using two (or more) '@' instances for each service (e.g.
"SERVICENAME@INSTANCE") as documented in systemd.unit(5).
Users of traditional SysV init may use SIGUSR2 to spawn a replacement process and gracefully terminate
the old process using SIGQUIT.
In either case, the old process will not truncate running responses; so responses to expensive requests
do not get interrupted and lost.
CONTACT
Feedback welcome via plain-text mail to <mailto:meta@public-inbox.org>
The mail archives are hosted at <https://public-inbox.org/meta/> and
<http://4uok3hntl7oi7b4uf4rtfwefqeexfzil2w6kgk2jn5z2f764irre7byd.onion/meta/>
COPYRIGHT
Copyright all contributors <mailto:meta@public-inbox.org>
License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
SEE ALSO
public-inbox-httpd(1), public-inbox-imapd(1), public-inbox-nntpd(1), public-inbox-pop3d(1),
public-inbox-netd(1)
public-inbox.git 1993-10-02 PUBLIC-INBOX-DAEMON(8)