Keepalived 安装 配置

1.安装

yum -y install kernel-headers kernel-develcd /toolswget http://www.keepalived.org/software/keepalived-1.1.19.tar.gztar -zxvf keepalived-1.1.19.tar.gzcd keepalived-1.1.19./configure --with-kernel-dir=/lib/modules/$(uname -r)/buildmake && make install

cd /etc/sysconfigln -s /usr/local/etc/sysconfig/keepalived .cd /etc/rc3.d/ln -s /usr/local/etc/rc.d/init.d/keepalived S100keepalivedcd /etc/init.d/ln -s /usr/local/etc/rc.d/init.d/keepalived

复制一下备份文件

cp /usr/local/etc/keepalived/keepalived.conf /usr/local/etc/keepalived/keepalived.conf.bak

创建快捷链接

ln -s /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/keepalived.confln -s /usr/local/sbin/keepalived   /usr/sbin/keepalived

配置文件：
vim /etc/keepalived/keepalived.conf
打开这个文件，将 vrrp_instance VI_1 部分的代码修改如下：

vrrp_instance VI_1 {    state BACKUP    interface eth0    virtual_router_id 81    priority 100    advert_int 1        preempt_delay 5    authentication {        auth_type PASS        auth_pass 1111    }    virtual_ipaddress {        10.10.10.235/24 brd 10.10.10.229 dev eth0          }         virtual_routes{                10.0.0.0/8 via 10.10.10.219 dev eth0        }}

注意，首先通过ip addr 查看是否存在eth1，如果不存在，则填写eth0
对于主：

state MASTERpriority 101

10.10.10.229 是本机的ip地址
10.10.10.235是虚拟的ip地址

启动keepalived 

/etc/init.d/keepalived start

log日志查看：

tail -f /var/log/messages

查看

 ip addr  

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue     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 forever2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000    link/ether 08:00:27:71:92:f2 brd ff:ff:ff:ff:ff:ff    inet 10.10.10.229/24 brd 10.10.10.255 scope global eth0    inet 10.10.10.235/24 brd 10.10.10.229 scope global secondary eth0    inet6 fe80::a00:27ff:fe71:92f2/64 scope link        valid_lft forever preferred_lft forever3: sit0: <NOARP> mtu 1480 qdisc noop     link/sit 0.0.0.0 brd 0.0.0.0

然后就可以看到235的虚拟ip

然后开启nginx配置

主机1：10.10.10.229

主机2：10.10.10.230

在两台虚拟机上面配置10.10.10.235这个虚拟IP，

保证 10.10.10.229  10.10.10.230 这两个地址，是可以访问的（在nginx已经配置好路径）

访问http://10.10.10.235  发现出现的230地址，关掉230的keepalived，然后发现访问的229地址。

同样，keepalived可以配置作为mysql等其他的连接   吧连接mysql的ip  在php设置成vip即可

$conn=mysql_connect("10.10.10.235", "root", "123456");