keepalived双击热备，安装部署文档:
下载目录：/apps/keepalived-1.2.7.tar.gz
1:—> yum install -y make wget
2:—> yum install -y gcc openssl-devel popt-devel
3:—> wget http://www.keepalived.org/software/keepalived-1.2.7.tar.gz
4:—> tar -zxvf keepalived-1.2.7.tar.gz
5:—> ./configure
6:—> make && make install
7:—> cd /apps/keepalived-1.2.7/keepalived/etc/keepalived
8:—> 配置keepalived.conf 主(192.168.8.116)/备(192.168.8.117)
主节点keepalived.conf：
global_defs {
router_id NodeA
}
vrrp_instance VI_1 {
state MASTER #设置为主服务器
interface eth0 #监测网络接口
virtual_router_id 51 #主、备必须一样
priority 100 #(主、备机取不同的优先级，主机值较大，备份机值较小,值越大优先级越高)
advert_int 1 #VRRP Multicast广播周期秒数
authentication {
auth_type PASS #VRRP认证方式，主备必须一致
auth_pass 1111 #(密码)
}
virtual_ipaddress {
192.168.8.100/24 #VRRP HA虚拟地址
}
}
备节点keepalived.conf：
global_defs {
router_id NodeB
}
vrrp_instance VI_1 {
state BACKUP #设置为主服务器
interface eth0 #监测网络接口
virtual_router_id 51 #主、备必须一样
priority 90 #(主、备机取不同的优先级，主机值较大，备份机值较小,值越大优先级越高)
advert_int 1 #VRRP Multicast广播周期秒数
authentication {
auth_type PASS #VRRP认证方式，主备必须一致
auth_pass 1111 #(密码)
}
virtual_ipaddress {
192.168.8.100/24 #VRRP HA虚拟地址
}
}
9:—> cp keepalived.conf /etc/
10:—> cp keepalived.conf /etc/keepalived/
11:—> cd /apps/keepalived-1.2.7/keepalived/bin
12:—> cp keepalived /etc/init.d/
13:—> cd /etc/init.d/
14:—> chkconfig –add keepalived
15:—> chkconfig keepalived on
16:—> 设置keepalived日志 keepalived.log
17:—> 默认日志存放在系统日志：/var/log/messages下 tail -f /var/log/messages
18:—> 我们将日志单独存放 vim /etc/sysconfig/keepalived
把KEEPALIVED_OPTIONS=”-D” 修改为：KEEPALIVED_OPTIONS=”-D -d -S 0″
vim /etc/rsyslog.conf
在文件末尾添加
local0.* /var/log/keepalived.log
19:—> 重启日志记录服务 /etc/init.d/rsyslog restart
20:—> 启动keepalived /etc/init.d/keepalived start
21:—> 查看log消息 tail -f /var/log/keepalived.log
22:—> 通过ip a 命令查看虚拟ip：192.168.8.100/24绑定到了eth0上
23:—> 通过虚拟ip:192.168.8.100 访问测试，116/117两台nginx，或者两台tomcat http服务器
24:—> 关闭master keepalived 发现backup机器开始提供服务
