multiwatch(1)

NAME
multiwatch - forks and watches multiple instances of a program in the same environment

SYNOPSIS
multiwatch [options] -- <application> [app arguments] multiwatch -v multiwatch --help | -?

DESCRIPTION
multiwatch is used to fork and watch multiple FastCGI backends.

OPTIONS

-f, --forks=children
    Number of children to fork and watch (default 1)

-r, --retry=retries
    Number of retries to fork a single child (default 3)

-t, --timeout=msecs
    Retry timeout in ms; if the child dies after the timeout the retry counter is reset (default 10000 ms = 10 s)

-s, --signal=signame
    Signal to send to children to signal 'graceful' termination (HUP,INT,QUIT,TERM,USR1,USR2, default is USR1)

-?, --help
    General usage instructions

-v, --version
    Show version and exit

SIGNAL HANDLING
multiwatch will forward the signal USR2; if it receives HUP,INT,QUIT,TERM or USR1, it will send the signal from --signal to the children; if it receives another signal from that group, it will forward the signal again. A signal of the group HUP,INT,QUIT,TERM and USR1 tells multiwatch to go into "shutdown" mode, so it won't restart children after receiving it.

EXAMPLE

Spawn 2 rails instances on the same FastCGI socket (and supervise them):
    spawn-fcgi -s /tmp/fastcgi-rails.sock -n -- /usr/bin/multiwatch -f 2 /home/rails/public/dispatch.fcgi

SEE ALSO
spawn-fcgi(1)

AUTHOR
Stefan Buehler <source@stbuehler.de>.