安装HAProxy请参考

http://www.cnblogs.com/kgdxpr/p/3272861.html

安装Keepalived

1、下载安装依赖包

yum install -y wget make gcc openssl-devel popt-devel

2、下载、安装Keepalived

wget http://www.keepalived.org/software/keepalived-1.2.8.tar.gz
tar zxvf keepalived-1.2..tar.gz
cd keepalived-1.2.
./configure --prefix=/usr/local/keepalived
make
make install

3、安装成功后做成服务模式。

cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/

4、配置文件

mkdir -p /etc/keepalived/
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf
chmod +x /etc/init.d/keepalived
vi /etc/keepalived/keepalived.conf
global_defs {
router_id LVS_DEVEL
}
#监测haproxy进程状态,每2秒执行一次
vrrp_script chk_haproxy {
script "/etc/keepalived/chk_haproxy.sh"
interval
weight
}
vrrp_instance VI_1 {
state MASTER #从服务器为BACKUP
interface eth0
virtual_router_id
priority #从服务器要低于100
advert_int
mcast_src_ip 10.10.3.171 #MASTER服务器IP,从服务器写从服务器的IP
authentication {
auth_type PASS
auth_pass 111111
}
track_script {
chk_haproxy #监测haproxy进程状态
}
virtual_ipaddress {
10.10.3.170 #虚拟IP
}
}

chk_haproxy.sh内容

vi /etc/keepalived/chk_haproxy.sh
status=$(ps aux|grep haproxy | grep -v grep | grep -v bash | wc -l)
if [ "${status}" = "" ]; then
/etc/init.d/haproxy start status2=$(ps aux|grep haproxy | grep -v grep | grep -v bash |wc -l) if [ "${status2}" = "" ]; then
/etc/init.d/keepalived stop
fi
fi

启动和关闭服务

service keepalived start
service keepalived stop

高可用测试

、将Master上的keepalived停止

查看Master上的日志

tail -f /var/log/messages

Sep  ::  Keepalived[]: Stopping Keepalived v1.2.8 (/,)
Sep :: Keepalived_vrrp[]: VRRP_Instance(VI_1) sending priority
Sep :: Keepalived_vrrp[]: VRRP_Instance(VI_1) removing protocol VIPs. 发现Master释放了VIP 再查看Backup上的日志 Sep :: Keepalived_vrrp[]: VRRP_Instance(VI_1) Transition to MASTER STATE
Sep :: Keepalived_vrrp[]: VRRP_Instance(VI_1) Entering MASTER STATE
Sep :: Keepalived_vrrp[]: VRRP_Instance(VI_1) setting protocol VIPs.
Sep :: Keepalived_vrrp[]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 10.10.3.180
Sep :: Keepalived_healthcheckers[]: Netlink reflector reports IP 10.10.3.180 added 发现Backup绑定了VIP 、将Master上的keepalived启动 查看Master上的日志 tail -f /var/log/messages Sep :: Keepalived_vrrp[]: VRRP_Instance(VI_1) Entering MASTER STATE
Sep :: Keepalived_vrrp[]: VRRP_Instance(VI_1) setting protocol VIPs.
Sep :: Keepalived_vrrp[]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 10.10.3.180
Sep :: Keepalived_healthcheckers[]: Netlink reflector reports IP 10.10.3.180 added 发现Master绑定了VIP 再查看Backup上的日志 Sep :: Keepalived_vrrp[]: VRRP_Instance(VI_1) Received higher prio advert
Sep :: Keepalived_vrrp[]: VRRP_Instance(VI_1) Entering BACKUP STATE
Sep :: Keepalived_vrrp[]: VRRP_Instance(VI_1) removing protocol VIPs.
Sep :: Keepalived_healthcheckers[]: Netlink reflector reports IP 10.10.3.180 removed 发现Backup释放了VIP

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