第一步：更改系统控制配置文件，同意分配虚拟IP（VIP）

/etc/sysctl.conf

net.ipv4.ip_nonlocal_bind=1

<pre style="word-wrap: normal; line-height: 18px;">sysctl -p

步骤二：安装HAPROXY和KEEPALIVED

apt-get update && apt-get install keepalived haproxy -y

步骤三：配置KEEPALIVED

etc/keepalived/keepalived.conf

global_defs {

  router_id haproxy1

}

vrrp_script haproxy {

  script "killall -0 haproxy"

  interval 2

  weight 2

}

vrrp_instance 50 {

  virtual_router_id 50

  advert_int 1

  priority 101

  state MASTER

  interface eth0

  virtual_ipaddress {

    192.168.1.32 dev eth0

  }

  track_script {

    haproxy

  }

}

步骤四：配置HAPROXY

/etc/haproxy/haproxy.cfg

global

	chroot /var/lib/haproxy

	user haproxy

	group haproxy

	daemon

	log 192.168.1.30 local0

	stats socket /var/lib/haproxy/stats

	maxconn 4000

defaults

	log	global

	mode	http

	option	httplog

	option	dontlognull

        contimeout 5000

        clitimeout 50000

        srvtimeout 50000

	errorfile 400 /etc/haproxy/errors/400.http

	errorfile 403 /etc/haproxy/errors/403.http

	errorfile 408 /etc/haproxy/errors/408.http

	errorfile 500 /etc/haproxy/errors/500.http

	errorfile 502 /etc/haproxy/errors/502.http

	errorfile 503 /etc/haproxy/errors/503.http

	errorfile 504 /etc/haproxy/errors/504.http

listen stats 192.168.1.30:80

        mode http

        stats enable

        stats uri /stats

        stats realm HAProxy\ Statistics

        stats auth admin:password

步骤五：启动HAPROXY和KEEPALIVED服务

service keepalived restart

service haproxy restart

步骤六：检測虚拟IP

# ip -a | grep eth0

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000

    inet 192.168.1.30/24 brd 192.168.1.255 scope global eth0

    inet 192.168.1.32/32 scope global eth0