signalfx-agent

#!/bin/sh

# chkconfig: 2345 20 80
### BEGIN INIT INFO
# Provides: signalfx-agent
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: SignalFx Agent
# Description:
#  The SignalFx Agent offers the ability to discover and collect metrics about
#  the host and services running on the host.
### END INIT INFO

# This sysv init script only works on Debian systems due to the use of
# start-stop-daemon.  We don't support any RHEL based systems that still use
# sysv, as they all use either upstart (e.g. centos6/amazon) or systemd.

dir="/usr/lib/signalfx-agent"
cmd="/usr/bin/signalfx-agent"
user="signalfx-agent"
group="signalfx-agent"
rundir="/var/run/signalfx-agent"

name="signalfx-agent"
pidfile="/var/run/$name.pid"
logfile="/var/log/$name.log"

get_pid() {
    cat "$pidfile"
}

is_running() {
    [ -f "$pidfile" ] && ps -p `get_pid` > /dev/null 2>&1
}

case "$1" in
  start)
    if is_running; then
      echo "Already started"
    else
      echo "Starting $name"

      mkdir -p "$rundir"
      chown -R signalfx-agent "$rundir"
      chmod 0755 "$rundir"

      touch $logfile
      chown signalfx-agent $logfile

      nohup su -s /bin/sh -c 'exec "$0" "$@"' $user -- $cmd >> /var/log/signalfx-agent.log 2>&1 &
      pid=$!

      if [ $? -eq 0 ]; then
        echo "Started.  Logs will go to /var/log/signalfx-agent.log"
        echo -n $pid > $pidfile
        exit 0
      else
        echo "Failed to start, see /var/log/signalfx-agent.log"
        exit 1
      fi
    fi
  ;;

  stop)
    if is_running; then
      echo -n "Stopping $name.."

      kill `get_pid`

      for i in 0 1 2 3 4 5 6 7 8 9; do
        if is_running; then
          echo -n "."
          sleep 1
        fi
      done

      if is_running; then
        echo "Failed to stop"
        exit 1
      else
        echo "Stopped"
      fi
    else
      echo "Not running"
    fi

    rm -f "$pidfile"
  ;;

  restart)
    $0 stop
    if is_running; then
      echo "Unable to stop, will not attempt to start"
      exit 1
    fi
    $0 start
    ;;

  status)
    if is_running; then
      echo "Running with pid `get_pid`"
    else
      echo "Not running"
    fi
    ;;

  *)
    echo "Usage: $0 {start|stop|restart|status}"
    exit 1
    ;;
esac

exit 0