CentOS 6.6 install and configure supervisor process management tool

1. Supervisor is a C/S system, which allows users to monitor and control the number of background service processes in Unix-like operating systems. A very important function is to monitor the main background processes of the server, and automatically restart when a problem occurs.

 

2. Download the corresponding setuptools according to the python version on the server

[root@test1 ~]# python -V

Python 2.6.6

wget http://pypi.python.org/packages/2.6/s/setuptools/setuptools-0.6c11-py2.6.egg#md5=bfa92100bd772d5a213eedd356d64086

direct installation

sh setuptools-0.6c11-py2.6.egg

 

3. Download and install supervisor

wget http://pypi.python.org/packages/source/s/supervisor/supervisor-3.0b1.tar.gz

tar -zxvf supervisor-3.0b1.tar.gz

cd supervisor-3.0b1

python setup.py install

After installing setuptools you can also

easy_install supervisor

 

4. Set the supervisor configuration file

Create a default configuration file

echo_supervisord_conf  >/etc/supervisord.conf

vi /etc/supervisord.conf

Uncomment the following and modify the IP to 0.0.0.0

 

[inet_http_server]        ; inet (TCP) server disabled by default
port=0.0.0.0:9001        ; (ip_address:port specifier, *:port for all iface)
username=user              ; (default is no username (open server))
password=123              ; (default is no password (open server))

 

 

Add a custom background process (note that the process names are separated by a :)

 

[program:hello]
command=python /root/hello.py
priority=1
numprocs=1
autostart=true
autorestart=true
startretries=10
stopsignal=KILL
stopwaitsecs=10
redirect_stderr=true
stdout_logfile=/root/hello.log

 

 

 

5. Execute the following command:

vi /etc/init.d/supervisord

 

6. Enter the following:

 

Note: The following variables in this file need to be rewritten according to your actual directory.

 

PREFIX=/usr/local

 

SUPERVISORD=$PREFIX/bin/supervisord ##Installation path of the supervisord program

 

SUPERVISORCTL=$PREFIX/bin/supervisorctl ##Installation path of the supervisorctl program

 

PIDFILE=/var/supervisor/supervisord.pid ##The /var/supervisor directory needs to be created first

 

LOCKFILE=/var/supervisor/supervisord.lock

 

OPTIONS="-c /etc/supervisord.conf" ##Configuration file path

 

 

#!/bin/bash
#
# supervisord   This scripts turns supervisord on
# chkconfig:	345 83 04
# description:  supervisor is a process control utility.  It has a web based
#	  xmlrpc interface as well as a few other nifty features.
#

# source function library
. /etc/rc.d/init.d/functions

set -a

PREFIX=/usr/local

SUPERVISORD=$PREFIX/bin/supervisord
SUPERVISORCTL=$PREFIX/bin/supervisorctl

PIDFILE=/var/supervisor/supervisord.pid
LOCKFILE=/var/supervisor/supervisord.lock

OPTIONS="-c /etc/supervisord.conf"

# unset this variable if you don't care to wait for child processes to shutdown before removing the $LOCKFILE-lock
WAIT_FOR_SUBPROCESSES=yes

# remove this if you manage number of open files in some other fashion
ulimit -n 96000

RETVAL=0


running_pid()
{
  # Check if a given process pid's cmdline matches a given name
  pid=$1
  name=$2
  [ -z "$pid" ] && return 1
  [ ! -d /proc/$pid ] && return 1
  (cat /proc/$pid/cmdline | tr "\000" "\n"|grep -q $name) || return 1
  return 0
}

running()
{
# Check if the process is running looking at /proc
# (works for all users)

  # No pidfile, probably no daemon present
  [ ! -f "$PIDFILE" ] && return 1
  # Obtain the pid and check it against the binary name
  pid=`cat $PIDFILE`
  running_pid $pid $SUPERVISORD || return 1
  return 0
}

start() {
    echo "Starting supervisord: "

    if [ -e $PIDFILE ]; then
    echo "ALREADY STARTED"
    return 1
  be

  # start supervisord with options from sysconfig (stuff like -c)
    $SUPERVISORD $OPTIONS

  # show initial startup status
  $SUPERVISORCTL $OPTIONS status

  # only create the subsyslock if we created the PIDFILE
    [ -e $PIDFILE ] && touch $LOCKFILE
}

stop() {
    echo -n "Stopping supervisord: "
    $SUPERVISORCTL $OPTIONS shutdown
  if [ -n "$WAIT_FOR_SUBPROCESSES" ]; then
      echo "Waiting roughly 60 seconds for $PIDFILE to be removed after child processes exit"
      for sleep in  2 2 2 2 4 4 4 4 8 8 8 8 last; do
        if [ ! -e $PIDFILE ] ; then
          echo "Supervisord exited as expected in under $total_sleep seconds"
          break
        else
          if [[ $sleep -eq "last" ]] ; then
            echo "Supervisord still working on shutting down. We've waited roughly 60 seconds, we'll let it do its thing from here"
            return 1
          else
            sleep $sleep
            total_sleep=$(( $total_sleep + $sleep ))
          be

        be
      done
    be

    # always remove the subsys. We might have waited a while, but just remove it at this point.
    rm -f $LOCKFILE
}

restart() {
    stop
    start
}

case "$1" in
  start)
    start
    RETVAL=$?
    ;;
  stop)
    stop
    RETVAL=$?
    ;;
  restart|force-reload)
    restart
    RETVAL=$?
    ;;
  reload)
    $SUPERVISORCTL $OPTIONS reload
    RETVAL=$?
    ;;
  condrestart)
    [ -f $LOCKFILE ] && restart
    RETVAL=$?
    ;;
  status)
    $SUPERVISORCTL $OPTIONS status
    if running ; then
      RETVAL=0
    else
      RETVAL=1
    be
    ;;
  *)
    echo $"Usage: $0 {start|stop|status|restart|reload|force-reload|condrestart}"
    exit 1
esac

exit $RETVAL

 

 

 

After saving, you can execute the following command to modify the file permissions:

 

chmod 777 /etc/init.d/supervisord

 

/etc/init.d/supervisord  start

 

 In this way, the supervisor is started.

 

7. Configure boot up

 

Execute the following commands:

 

chkconfig supervisord  on

 

 You can check the success with the following command

 

chkconfig --list | grep  supervisord