Keepalived 安装 配置

1.安装

yum -y install kernel-headers kernel-devel
cd /tools
wget http://www.keepalived.org/software/keepalived-1.1.19.tar.gz tar -zxvf keepalived-1.1.19.tar.gz
cd keepalived-1.1.19
./configure --with-kernel-dir=/lib/modules/$(uname -r)/build
make && make install

cd /etc/sysconfig
ln -s /usr/local/etc/sysconfig/keepalived .
cd /etc/rc3.d/
ln -s /usr/local/etc/rc.d/init.d/keepalived S100keepalived
cd /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.conf
ln -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 MASTER
priority 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 forever
2: 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 forever
3: 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");