Nginx反向代理及负载均衡实现过程

[root@nginx ~] # ntpdate 202.120.2.101

[root@web1 ~] # ntpdate 202.120.2.101

[root@web2 ~] # ntpdate 202.120.2.101

[root@nginx ~] # service iptables stop

[root@nginx ~] # chkconfig iptables off

[root@nginx ~] # getenforce

Disabled

[root@web1 ~] # service iptables stop

[root@web1 ~] # chkconfig iptables off

[root@web1 ~] # getenforce

Disabled

[root@web2 ~] # service iptables stop

[root@web2 ~] # chkconfig iptables off

[root@web2 ~] # getenforce

Disabled

[root@nginx src] # groupadd -g 108 -r nginx

[root@nginx src] # useradd -u 108 -r -g 108 nginx

[root@nginx src] # id nginx

uid=108(nginx) gid=108(nginx) 组=108(nginx)

[root@nginx ~] # cat /etc/init.d/nginx

#!/bin/sh

#

#

# chkconfig: - 85 15

# proxy and IMAP/POP3 proxy server

# processname: nginx

# config: /etc/nginx/nginx.conf

# config: /etc/sysconfig/nginx

# pidfile: /var/run/nginx.pid

# Source function library.

. /etc/rc .d /init .d /functions

# Source networking configuration.

. /etc/sysconfig/network

# Check that networking is up.

[ "$NETWORKING" = "no" ] && exit

nginx= "/usr/sbin/nginx"

prog=$( basename $nginx)

NGINX_CONF_FILE= "/etc/nginx/nginx.conf"

[ -f /etc/sysconfig/nginx ] && . /etc/sysconfig/nginx

lockfile= /var/lock/subsys/nginx

make_dirs() {

# make required directories

user=`nginx -V 2>&1 | grep "configure arguments:" | sed ‘s/[^*]*--user=\([^ ]*\).*/\1/g‘ -`

options=`$nginx -V 2>&1 | grep ‘configure arguments:‘ `

for opt in $options; do

if [ ` echo $opt | grep ‘.*-temp-path‘ ` ]; then

value=` echo $opt | cut -d "=" -f 2`

if [ ! -d "$value" ]; then

# echo "creating" $value

mkdir -p $value && chown -R $user $value

fi

fi

done

}

start() {

[ -x $nginx ] || exit

[ -f $NGINX_CONF_FILE ] || exit

make_dirs

echo -n $ "Starting $prog: "

daemon $nginx -c $NGINX_CONF_FILE

retval=$?

echo

[ $retval - eq 0 ] && touch $lockfile

return $retval

}

stop() {

echo -n $ "Stopping $prog: "

killproc $prog -QUIT

retval=$?

echo

[ $retval - eq 0 ] && rm -f $lockfile

return $retval

}

restart() {

configtest || return $?

stop

sleep

start

}

reload() {

configtest || return $?

echo -n $ "Reloading $prog: "

killproc $nginx -HUP

RETVAL=$?

echo

}

force_reload() {

restart

}

configtest() {

$nginx -t -c $NGINX_CONF_FILE

}

rh_status() {

status $prog

}

rh_status_q() {

rh_status > /dev/null 2>&1

}

case "$1" in

start)

rh_status_q && exit

$1

;;

stop)

rh_status_q || exit

$1

;;

restart|configtest)

$1

;;

reload)

rh_status_q || exit

$1

;;

force-reload)

force_reload

;;

status)

rh_status

;;

condrestart|try-restart)

rh_status_q || exit

;;

*)

echo $ "Usage: $0 {start|stop|status|restart|condrestart|try-restart|reload|force-reload|configtest}"

exit

esac

[root@nginx ~] # chmod +x /etc/init.d/nginx

[root@nginx ~] # chkconfig --add nginx

[root@nginx ~] # chkconfig nginx on

[root@nginx ~] # chkconfig nginx --list

nginx 0:关闭 1:关闭 2:启用 3:启用 4:启用 5:启用 6:关闭

[root@nginx ~] # service nginx start

正在启动 nginx：

[root@nginx ~] # netstat -ntlp | grep :80