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runit(8) [debian man page]

runit(8)						      System Manager's Manual							  runit(8)

NAME
runit - a UNIX process no 1 SYNOPSIS
runit DESCRIPTION
runit must be run as Unix process no 1. It performs the system's booting, running, and shutdown in three stages: STAGE 1 runit runs /etc/runit/1 and waits for it to terminate. The system's one time tasks are done here. /etc/runit/1 has full control of /dev/console to be able to start an emergency shell if the one time initialization tasks fail. If /etc/runit/1 crashes, or exits 100, runit will skip stage 2 and enter stage 3. STAGE 2 runit runs /etc/runit/2, which should not return until system shutdown; if it crashes, or exits 111, it will be restarted. Normally /etc/runit/2 starts runsvdir(8). runit is able to handle the ctrl-alt-del keyboard request in stage 2, see below. STAGE 3 If runit is told to shutdown the system, or stage 2 returns, it terminates stage 2 if it is running, and runs /etc/runit/3. The systems tasks to shutdown and possibly halt or reboot the system are done here. If stage 3 returns, runit checks if the file /etc/runit/reboot exists and has the execute by owner permission set. If so, the system is rebooted, it's halted otherwise. CTRL-ALT-DEL If runit receives the ctrl-alt-del keyboard request and the file /etc/runit/ctrlaltdel exists and has the execute by owner permission set, runit runs /etc/runit/ctrlaltdel, waits for it to terminate, and then sends itself a CONT signal. SIGNALS
runit only accepts signals in stage 2. If runit receives a CONT signal and the file /etc/runit/stopit exists and has the execute by owner permission set, runit is told to shut- down the system. if runit receives an INT signal, a ctrl-alt-del keyboard request is triggered. SEE ALSO
runit-init(8), runsvdir(8), runsvchdir(8), sv(8), runsv(8), chpst(8), utmpset(8), svlogd(8) http://smarden.org/runit/ AUTHOR
Gerrit Pape <pape@smarden.org> runit(8)

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runsv(8)						      System Manager's Manual							  runsv(8)

NAME
runsv - starts and monitors a service and optionally an appendant log service SYNOPSIS
runsv service DESCRIPTION
service must be a directory. runsv switches to the directory service and starts ./run. If ./run exits and ./finish exists, runsv starts ./finish. If ./finish doesn't exist or ./finish exits, runsv restarts ./run. If ./run or ./finish exit immediately, runsv waits a second before starting ./finish or restarting ./run. Two arguments are given to ./finish. The first one is ./run's exit code, or -1 if ./run didn't exit normally. The second one is the least significant byte of the exit status as determined by waitpid(2); for instance it is 0 if ./run exited normally, and the signal number if ./run was terminated by a signal. If runsv cannot start ./run for some reason, the exit code is 111 and the status is 0. If the file service/down exists, runsv does not start ./run immediately. The control interface (see below) can be used to start the ser- vice and to give other commands to runsv. If the directory service/log exists, runsv creates a pipe, redirects service/run's and service/finish's standard output to the pipe, switches to the directory service/log and starts ./run (and ./finish) exactly as described above for the service directory. The standard input of the log service is redirected to read from the pipe. runsv maintains status information in a binary format (compatible to the daemontools' supervise program) in service/supervise/status and service/log/supervise/status, and in a human-readable format in service/supervise/stat, service/log/supervise/stat, service/supervise/pid, service/log/supervise/pid. CONTROL
The named pipes service/supervise/control, and (optionally) service/log/supervise/control are provided to give commands to runsv. You can use sv(8) to control the service or just write one of the following characters to the named pipe: u Up. If the service is not running, start it. If the service stops, restart it. d Down. If the service is running, send it a TERM signal, and then a CONT signal. If ./run exits, start ./finish if it exists. After it stops, do not restart service. o Once. If the service is not running, start it. Do not restart it if it stops. p Pause. If the service is running, send it a STOP signal. c Continue. If the service is running, send it a CONT signal. h Hangup. If the service is running, send it a HUP signal. a Alarm. If the service is running, send it a ALRM signal. i Interrupt. If the service is running, send it a INT signal. q Quit. If the service is running, send it a QUIT signal. 1 User-defined 1. If the service is running, send it a USR1 signal. 2 User-defined 2. If the service is running, send it a USR2 signal. t Terminate. If the service is running, send it a TERM signal. k Kill. If the service is running, send it a KILL signal. x Exit. If the service is running, send it a TERM signal, and then a CONT signal. Do not restart the service. If the service is down, and no log service exists, runsv exits. If the service is down and a log service exists, runsv closes the standard input of the log service, and waits for it to terminate. If the log service is down, runsv exits. This command is ignored if it is given to service/log/supervise/control. Example: to send a TERM signal to the socklog-unix service, either do # sv term /etc/service/socklog-unix or # printf t >/etc/service/socklog-unix/supervise/control printf(1) usually blocks if no runsv process is running in the service directory. CUSTOMIZE CONTROL
For each control character c sent to the control pipe, runsv first checks if service/control/c exists and is executable. If so, it starts service/control/c and waits for it to terminate, before interpreting the command. If the program exits with return code 0, runsv refrains from sending the service the corresponding signal. The command o is always considered as command u. On command d first service/control/t is checked, and then service/control/d. On command x first service/control/t is checked, and then service/control/x. The control of the optional log service cannot be customized. SIGNALS
If runsv receives a TERM signal, it acts as if the character x was written to the control pipe. EXIT CODES
runsv exits 111 on an error on startup or if another runsv is running in service. runsv exits 0 if it was told to exit. SEE ALSO
sv(8), chpst(8), svlogd(8), runit(8), runit-init(8), runsvdir(8), runsvchdir(8), utmpset(8) http://smarden.org/runit/ AUTHOR
Gerrit Pape <pape@smarden.org> runsv(8)
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