python之supervisord启动脚本

Supervisord是用Python实现的一款非常实用的进程管理工具，在批量服务化管理时特别有效。可以将非Daemon的应用转为daemon程序。关于supervisord的安装和配置，在网上已经有很多现成的帖子，我这里就不重复了。

在centos和rhel的环境下，我们一般是用chkconfig来管理服务的启动停止、开机自启动等。下面我列出Supervisord的服务脚本。

1. 执行如下命令：

vim /etc/init.d/supervisord

2.输入如下内容：

注意：该文件中的如下几个变量，都需要根据你实际的目录来改写。

PREFIX=/usr/local

SUPERVISORD=$PREFIX/bin/supervisord      ##supervisord   程序的安装路径

SUPERVISORCTL=$PREFIX/bin/supervisorctl  ##supervisorctl 程序的安装路径

PIDFILE=/var/supervisor/supervisord.pid   ##需要先创建/var/supervisor目录

LOCKFILE=/var/supervisor/supervisord.lock

OPTIONS="-c /etc/supervisord.conf"   ##配置文件的路径

#!/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
  fi

  # 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 ))
          fi

        fi
      done
    fi

    # 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
    fi
    ;;
  *)
    echo $"Usage: $0 {start|stop|status|restart|reload|force-reload|condrestart}"
    exit 1
esac

exit $RETVAL

保存完毕之后，可以执行以下命令修改文件权限：

chmod 777 /etc/init.d/supervisord

/etc/init.d/supervisord  start

这样，supervisor就启动了。

3. 配置开机启动

执行以下命令：

chkconfig supervisord  on

可以以下命令查看是否成功

chkconfig --list | grep  supervisord