实验环境及软件版本：
CentOS版本： 6.6(2.6.32.-504.el6.x86_64)
nginx版本： nginx-1.6.2
keepalived版本：keepalived-1.2.7
准备工作：
关闭防火墙：service iptables stop
chkconfig iptables off
关闭selinux: sed -i 's/SELINUX=disabled/SELINUX=enforcing/g' /etc/selinux/config
init 6 重启系统一定要！
1.准备安装依赖包:
yum -y install pcre pcre-devel openssl openssl-devel zlib zlib-devel gcc gcc-c++ popt-devel
安装keepalived出现configure: error: Popt libraries is required
解决方法:yum -y install popt-devel
2.下载安装包
wget http://nginx.org/download/nginx-1.6.2.tar.gz
wget http://www.keepalived.org/software/keepalived-1.2.7.tar.gz
3.安装NginX
tar zxvf nginx-1.6.2.tar.gz
cd nginx-1.6.2
./configure
make && make install
4.安装keepalived
tar zxvf keepalived-1.2.7.tar.gz
cd keepalived-1.2.7
./configure
make
make install
cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
mkdir /etc/keepalived
cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
cp /usr/local/sbin/keepalived /usr/sbin/
5.加入开机自启动服务
方法一
echo "/usr/local/nginx/sbin/nginx" >> /etc/rc.local
echo "/etc/init.d/keepalived start" >> /etc/rc.local
方法二
[root@nginx keepalived-1.2.7]# cat >>/etc/rc.local< > /usr/local/nginx/sbin/nginx > /etc/init.d/keepalived start > EOF [root@nginx keepalived-1.2.7]# cat /etc/rc.local #!/bin/sh # # This script will be executed *after* all the other init scripts. # You can put your own initialization stuff in here if you don't # want to do the full Sys V style init stuff. touch /var/lock/subsys/local /usr/local/nginx/sbin/nginx /etc/init.d/keepalived start 6.配置 6.1 配置nginx 两台接入服务器的nginx的配置完全一样,主要配置/usr/local/nginx/conf/nginx.conf的http.其中多域名指向是通过虚拟主机(配置http下面的server)实现;同一域名的不同虚拟目录通过每 个server下面的不同location实现. http { include mime.types; default_type application/octet-stream; #log_format main '$remote_addr - $remote_user [$time_local] "$re quest" ' # '$status $body_bytes_sent "$http_referer" ' # '"$http_user_agent" "$http_x_forwarded_for"'; #access_log logs/access.log main; sendfile on; #tcp_nopush on; #keepalive_timeout 0; keepalive_timeout 65; #gzip on; upstream myserver{ server 192.168.0.110:80 max_fails=3 fail_timeout=20s; server 192.168.0.111:80 max_fails=3 fail_timeout=20s; ip_hash; } server { listen 80; server_name 192.168.0.150; #charset koi8-r; #access_log logs/host.access.log main; location / { root /var/www/html; index index.php index.htm index.html; proxy_redirect off; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_next_upstream http_500 http_502 http_503 error timeo ut invalid_header; proxy_set_header X-Forwarded-For $remote_addr; proxy_pass http://myserver; } } 6.2 配置keepalived 按照上面的安装方法,keepalived的配置文件在/etc/keepalived/keepalived.conf.主、从服务器的 配置相关联但有所不同。如下： Master: ! Configuration File for keepalived global_defs { notification_email { } notification_email_from [email protected] smtp_server smtp.etiantian.org smtp_connect_timeout 30 router_id nginx_master } vrrp_instance VI_1 { state MASTER interface eth0 virtual_router_id 51 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.0.150 } } Backup: ! Configuration File for keepalived global_defs { notification_email { } notification_email_from [email protected] smtp_server smtp.etiantian.org smtp_connect_timeout 30 router_id nginx_backup } vrrp_instance VI_1 { state BACKUP interface eth0 virtual_router_id 51 priority 99 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.0.150 } } 7.验证： 先后在主、从服务器上启动/usr/local/nginx/sbin/nginx /etc/init.d/keepalived start 在主服务器上查看是否已经绑定了虚拟IP(VIP):ip addr [root@nginx ~]# ip addr 1: lo: link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: link/ether 00:0c:29:af:00:4e brd ff:ff:ff:ff:ff:ff inet 192.168.0.130/24 brd 192.168.0.255 scope global eth0 inet 192.168.0.150/32 scope global eth0 inet6 fe80::20c:29ff:feaf:4e/64 scope link valid_lft forever preferred_lft forever 停止主服务器上的keepalived:/etc/init.d/keepalived stop然后在从服务器上查看是否已经绑 定了虚拟IP(VIP): [root@nginx_back ~]# ip addr 1: lo: link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: link/ether 00:0c:29:21:b6:b1 brd ff:ff:ff:ff:ff:ff inet 192.168.0.131/24 brd 192.168.0.255 scope global eth0 inet 192.168.0.150/32 scope global eth0 inet6 fe80::20c:29ff:fe21:b6b1/64 scope link valid_lft forever preferred_lft forever 启动主服务器上的keepalived:/etc/init.d/keepalived start,再看看主服务器能否重新接管虚拟IP(VIP) [root@nginx ~]# ip addr 1: lo: link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: link/ether 00:0c:29:af:00:4e brd ff:ff:ff:ff:ff:ff inet 192.168.0.130/24 brd 192.168.0.255 scope global eth0 inet 192.168.0.150/32 scope global eth0 inet6 fe80::20c:29ff:feaf:4e/64 scope link valid_lft forever preferred_lft forever