HHVM502问题困扰了好多像我这样的新手菜鸟，经常不明原因的就会出现HHVM crash。网上也就很多文章讨论，很多都是建立一个监控脚本，当502出现就重启HHVM服务，今天给大家介绍用supervisor来管理HHVM进程，拒绝502出现。

什么是supervisor?

Supervisor是一个C/S系统,它可以在类unix操作系统让用户来监视和控制后台服务进程的数量，一个很重要的功能就是监控服务器的主要后台进程，并在出现问题是自动重启。

安装supervisor

1、根据服务器上的python版本下载对应的setuptools

[root@test1 ~]# python -V

显示 Python 2.6.6

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

sh setuptools-0.6c11-py2.6.egg

2、下载并安装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

安装setuptools后也可以

easy_install supervisor

3、创建默认的配置文件

echo_supervisord_conf  >/etc/supervisord.conf

4、设定supervisor开机启动

vi /etc/init.d/supervisord

#!/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

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

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

后面我们需要配置的是/etc/supervisord.conf这个文件，增加HHVM管理。

配置supervisord管理HHVM进程

编辑/etc/supervisord.conf

[program:hhvm]
command=/usr/bin/hhvm --mode server --config /etc/hhvm/config.hdf --config /etc/hhvm/php.ini -vServer.Type=fastcgi -vServer.Port=9000 ; the program (relative uses PATH, can take args)
;process_name=%(program_name)s ; process_name expr (default %(program_name)s)
numprocs=1 ; number of processes copies to start (def 1)
directory=/tmp ; directory to cwd to before exec (def no cwd)
;umask=022 ; umask for process (default None)
;priority=999 ; the relative start priority (default 999)
autostart=true ; start at supervisord start (default: true)
autorestart=unexpected ; whether/when to restart (default: unexpected)
;startsecs=1 ; number of secs prog must stay running (def. 1)
;startretries=3 ; max # of serial start failures (default 3)
;exitcodes=0,2 ; 'expected' exit codes for process (default 0,2)
;stopsignal=QUIT ; signal used to kill process (default TERM)
stopwaitsecs=10 ; max num secs to wait b4 SIGKILL (default 10)
;stopasgroup=true ; send stop signal to the UNIX process group (default false)
;killasgroup=true ; SIGKILL the UNIX process group (def false)
user=nginx ; 你启动HHVM的用户名

保存文件后执行supervisorctl reload，这样你的HHVM进程就由supervisor来管理了，当出现502时，supervisor就会重启HHVM.

需要注意的是HHVM启动需要以 server模式运行。

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