nginx+keeplived负载均衡配置

一、nginx 编译安装
1.依赖环境安装
     yum -y install gcc gcc-c++ zlib zlib-devel pcre pcre-devel openssl openssl-devel
     yum -y install kernel-devel Popt popt-devel
     yum -y groupinstall "Development Tools" "Development Libraries"

2.编译安装
    [root@localhost src]# tar -xvf nginx-1.8.0.tar.gz
    [root@localhost nginx-1.8.0]#cd nginx-1.8.0

#--with-http_stub_status_module ：可显示nginx连接数

[root@localhost nginx-1.8.0]# ./configure --with-http_stub_status_module --with-http_dav_module --with-http_addition_module --with-http_sub_module --with-http_flv_module --with-http_mp4_module --with-http_ssl_module
[root@localhost nginx-1.8.0]# make && make install

3.添加脚本
[root@localhost]# vim /etc/init.d/nginx
#---------------------------------------------------------------------------------------------------------------------------
#!/bin/sh
#
# nginx - this script starts and stops the nginx daemin
#
# chkconfig: - 85 15
# description: Nginx is an HTTP(S) server, HTTP(S) reverse
# proxy and IMAP/POP3 proxy server
# processname: nginx
# config: /usr/local/nginx/conf/nginx.conf
# pidfile: /usr/local/nginx/logs/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 0

nginx="/usr/local/nginx/sbin/nginx"
prog=$(basename $nginx)

NGINX_CONF_FILE="/usr/local/nginx/conf/nginx.conf"

lockfile=/var/lock/subsys/nginx

start() {
[ -x $nginx ] || exit 5
[ -f $NGINX_CONF_FILE ] || exit 6
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
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 0
$1
;;
stop)
rh_status_q || exit 0
$1
;;
restart|configtest)
$1
;;
reload)
rh_status_q || exit 7
$1
;;
force-reload)
force_reload
;;
status)
rh_status
;;
condrestart|try-restart)
rh_status_q || exit 0
;;
*)
echo $"Usage: $0 {start|stop|status|restart|condrestart|try-restart|reload|force-reload|configtest}"
exit 2
esac

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

二、配置upstream 模块
配置nginx.conf配置文件
1.在http{}中添加一个upstream.conf配置文件
include /usr/local/nginx/conf/upstream.conf;
     upstream www_test {
          #ip_hash; #如要看到测轮循的效果,这里需注释掉
          server 192.168.0.116:80;
          server 192.168.0.40:80;
}

2.将http{}中的server模块单独提取出来
include /usr/local/nginx/vhost/*.conf;

配置test 服务 /usr/local/nginx/vhost/test.conf
     server {
          listen 80;
          server_name localhost;

     location / {
          proxy_pass http://www_test;
          proxy_set_header Host $host;
          proxy_set_header X-Forwarded-Proto $scheme;
          proxy_set_header X-Real-IP $remote_addr;
          proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}

三、安装配置keeplived服务
1.安装
两台前端nginx 开启upstream的服务器安装keepalived服务

     [root@localhost src]# tar -xvf keepalived-1.1.15.tar.gz
     [root@localhost src]# cd keepalived-1.1.15
     [root@localhost keepalived-1.1.15]# ./configure --prefix=/usr/local/keepalived
     [root@localhost keepalived-1.1.15]# make && make install

     [root@localhost keepalived-1.1.15]# cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
     [root@localhost keepalived-1.1.15]# cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
     [root@localhost keepalived-1.1.15]# cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
     [root@localhost keepalived-1.1.15]# cp -r /usr/local/keepalived/etc/keepalived/ /etc/

     [root@localhost keepalived-1.1.15]# /etc/init.d/keepalived start

2.修改配置文件
[root@localhost keepalived-1.1.15]# vim /etc/keepalived/keepalived.conf
global_defs {
    notification_email {
   localhost@qq.com
}
    notification_email_from Alexandre.Cassen@firewall.loc
    smtp_server 127.0.0.1
    smtp_connect_timeout 30
    router_id node1
}

vrrp_instance VI_1 {
     state MASTER #主设置MASTER 从设置为BACKUP
     interface eth0 #eth0 为自己的网卡，要通过ifconfig 查看己的网卡名
     virtual_router_id 51
     priority 100 #备机要小于主
     advert_int 1
     authentication {
     auth_type PASS
     auth_pass 1111
}
virtual_ipaddress {
     192.168.0.200 #虚拟IP
}
}

virtual_server 192.168.0.200 80 {
     delay_loop 6
     lb_algo rr
     lb_kind DR
     nat_mask 255.255.255.0
     persistence_timeout 50
     protocol TCP

real_server 192.168.0.116 80 {
weight 1
TCP_CHECK {
      connect_timeout 3
      nb_get_retry 3
      delay_before_retry 3
      connect_port 80
   }
}
real_server 192.168.0.40 80 {
weight 1
TCP_CHECK {
     connect_timeout 3
     nb_get_retry 3
     delay_before_retry 3
     connect_port 80
}
}
}

[root@localhost ]# /etc/init.d/keepalived start    #keepalived 服务启动命令

四、后端可拿两台web 服务器来做测试即可