python之supervisord启动脚本

sonyet

　　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