背景介绍：
安装完nginx之后，因为nginx作为一个代理，一般是后台运行的。而且，我们也不希望在服务器在启动之后，还要手动输入命令来启动nginx。
所以，我们需要进行一些配置，使nginx服务器可以开机自动启动。
编写shell脚本
vi /etc/init.d/nginx
输入下面的文本
#!/bin/bash
# nginx startup script for the nginx http server
# it is v.0.0.2 version.
# chkconfig: - 85 15
# description: nginx is a high-performance web and proxy server.
# it has a lot of features, but it's not for everyone.
# processname: nginx
# pidfile: /var/run/nginx.pid
# config: /usr/local/nginx/conf/nginx.conf
nginxd=/usr/local/nginx/sbin/nginx
nginx_config=/usr/local/nginx/conf/nginx.conf
nginx_pid=/var/run/nginx.pid
retval=0
prog="nginx"
# source function library.
. /etc/rc.d/init.d/functions
# source networking configuration.
. /etc/sysconfig/network
# check that networking is up.
[ ${networking} = "no" ] && exit 0
[ -x $nginxd ] || exit 0
# start nginx daemons functions.
start() {
if [ -e $nginx_pid ];then
echo "nginx already running...."
exit 1
fi
echo -n $"starting $prog: "
daemon $nginxd -c ${nginx_config}
retval=$?
echo
[ $retval = 0 ] && touch /var/lock/subsys/nginx
return $retval
}
# stop nginx daemons functions.
stop() {
echo -n $"stopping $prog: "
killproc $nginxd
retval=$?
echo
[ $retval = 0 ] && rm -f /var/lock/subsys/nginx /var/run/nginx.pid
}
# reload nginx service functions.
reload() {
echo -n $"reloading $prog: "
#kill -hup `cat ${nginx_pid}`
killproc $nginxd -hup
retval=$?
echo
}
# see how we were called.
case "$1" in
start)
start
;;
stop)
stop
;;
reload)
reload
;;
restart)
stop
start
;;
status)
status $prog
retval=$?
;;
*)
echo $"usage: $prog {start|stop|restart|reload|status|help}"
exit 1
esac
exit $retval
然后， 按esc，输入 “:wq” 进行保存退出。
设置文件的访问权限
chmod a x /etc/init.d/nginx
加入到rc.local文件中
vi /etc/rc.local
在后面添加一行代码
/etc/init.d/nginx start
然后， 按esc，输入 “:wq” 进行保存退出。
至此，nginx开机自启已经设置完毕，可以重启一下服务器进行测试了。
