README.md

Notes

Starting/stopping processes occurs in serial, ergo make sure the start/stop commands go quickly or the whole thing hangs. I It's a good idea to use env.sh scripts to setup the execution environment so you have something fully reproducible. Here is the command to get the ruby environment via rvm.

rvm info environment | sed -n -e 's/: \{1,\}/=/' -e 's|.rvm/bin:.*|.rvm/bin:$PATH"|' -e 's/    \([A-Z]\)/export \1/p'

An example usage:

check process process_name with pidfile /path/to/pidfile.pid
  start program = "/usr/bin/env -i KEY=VALUE /path/to/env.sh /path/to/monit_exec start /path/to/pidfile.pid /path/to/stdin_file /path/to/stdout_file /path/to/logfile.log commmand args..."
  stop program  = "/usr/bin/env -i KEY=VALUE /path/to/env.sh /path/to/monit_exec stop /path/to/pidfile.pid /dev/null /dev/null /path/to/logfile.log"
  mode passive

monit_exec

#!/bin/bash
action="$1"
pid_file="$2"
stdin_file="$3"
stdout_file="$4"
stderr_file="$5"
shift 5

# ensure all files and directories exist
mkdir -p "$(dirname "$pid_file")"

printf "%s\n" "$stdin_file" "$stdout_file" "$stderr_file" |
while read file
do
  mkdir -p "$(dirname "$file")"
  if [ x"${file}" != x"${file%.fifo}" ] && ! [ -e "$file" ]
  then mkfifo "$file"
  fi
done

# ensure all stderr is logged
exec 2>>"$stderr_file"
log () {
  level="$1"
  message="$2"
  progname="$(basename "${pid_file%.pid}")"
  printf "[$(date +%Y-%m-%dT%H:%M:%S%z)] %s %s %s %s
" "$level" $$ "$progname" "$message" >&2
}

case $action in
  start)
    log INFO "$action - $* < $stdin_file > $stdout_file"
    echo $$ > "$pid_file";
    exec "$@" < "$stdin_file" > "$stdout_file"
    ;;
  stop)
    log INFO "$action"
    pid="$(cat "$pid_file")"
    kill -term "$pid" >&2

    num_tries=60
    try_num=0
    while [ "$try_num" -lt "$num_tries" ] && kill -0 "$pid" > /dev/null 2>&1
    do
      log INFO "wait for exit $((try_num + 1))/$num_tries ($pid)"
      sleep 1
      try_num=$((try_num + 1))
    done

    if [ "$try_num" -eq "$num_tries" ]
    then
      log WARN "forcing exit ($pid)"
      kill -kill "$pid" >&2
    fi
    rm "$pid_file"
    ;;
esac

monitrc

set httpd port 2812 and use address localhost allow localhost
set logfile /tmp/monit.log
include /Users/simonchiang/.monit.d/*