python之supervisord启动脚本（centos/rhel）

最新推荐文章于 2024-07-31 14:09:16 发布

最新推荐文章于 2024-07-31 14:09:16 发布 · 221 阅读

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本文介绍如何使用 Supervisord 进程管理工具在 CentOS 和 RHEL 环境下管理服务的启动和停止，并实现开机自启动。通过配置服务脚本，可以将非守护进程应用转换为守护进程，简化批量服务化管理。

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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