安装ansible：
[root@localhost ~]# tail -5 /etc/hosts
192.168.19.129 web129.yanglt.com web129
192.168.19.130 web130.yanglt.com web130
192.168.19.131 web131.yanglt.com web131
192.168.19.132 web132.yanglt.com web132[root@localhost ~]# vim /etc/hosts
[root@localhost ~]# yum -y install epel-release
[root@localhost ~]# yum -y install ansible
[root@localhost ~]# ssh-keygen
[root@localhost ~]# for i in {129..132}
> do
> ssh-copy-id web$i
> done

主lvs_master：192.168.19.129
备lvs_backup：192.168.19.130http(RS1):192.168.19.131
http(RS2):192.168.19.132虚IP：192.168.19.150virtual_ipaddress {192.168.19.150}
}virtual_server 192.168.19.150 80 {如上安装好ansible之后便于安装配置：
[root@localhost ~]# cat /etc/ansible/hosts
## [webservers]
## alpha.example.org
## beta.example.org
## 192.168.1.100
## 192.168.1.110
[webservers]
web129.yanglt.com
web130.yanglt.com
web131.yanglt.com
web132.yanglt.com
[master]
web129.yanglt.com
web130.yanglt.com
[web]
web131.yanglt.com
web132.yanglt.com

Master 安装keepalived+latest：
[root@localhost ~]# ansible master -m yum -a 'name=keepalived state=latest'
[root@localhost ~]# ansible master -m yum -a 'name=ipvsadm state=latest'
[root@web129 ~]#ipvsadm
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP localhost.localdomain:http rr
-> web131.yanglt.com:http Route 1 0 7
-> web132.yanglt.com:http Route 1 0 0
[root@web129 ~]# lsmod|grep ip_vs #检查当前加载的内核模块，看是否存在 ip_vs 模块，只有执行 ipvsadm 以后，才会在内核加载 ip_vs 模块

LVS的ip负载均衡技术就是通过IPVS模块来实现的
ip_vs_rr 12600 1
ip_vs 141092 3 ip_vs_rr
nf_conntrack 111302 1 ip_vs
libcrc32c 12644 2 xfs,ip_vs
[root@web129 ~]#

Slaver：

[root@localhost ~]# ansible master -m yum -a 'name=keepalived state=latest'
[root@localhost ~]# ansible master -m yum -a 'name=ipvsadm state=latest'
[root@web129 ~]# ipvsadm
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP localhost.localdomain:http rr
-> web131.yanglt.com:http Route 1 0 7
-> web132.yanglt.com:http Route 1 0 0
[root@web129 ~]# lsmod|grep ip_vs
ip_vs_rr 12600 1
ip_vs 141092 3 ip_vs_rr
nf_conntrack 111302 1 ip_vs
libcrc32c 12644 2 xfs,ip_vs
[root@web129 ~]#

MASTER：配置如下
[root@web129 ~]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalivedglobal_defs {notification_email {acassen@firewall.locfailover@firewall.locsysadmin@firewall.loc}notification_email_from Alexandre.Cassen@firewall.locsmtp_server 127.0.0.1smtp_connect_timeout 30router_id LVS_DEVEL
}vrrp_instance VI_1 {state MASTERinterface ens33virtual_router_id 51priority 100advert_int 1authentication {auth_type PASSauth_pass 1111}virtual_ipaddress {192.168.19.200}
}
virtual_server 192.168.19.200 80 {delay_loop 6lb_algo rr lb_kind DRnat_mask 255.255.255.0 persistence_timeout 0protocol TCPreal_server 192.168.19.131 80 {weight 1HTTP_GET {url { path /status_code 200}connect_timeout 3nb_get_retry 3delay_before_retry 3}}real_server 192.168.19.132 80 {weight 1HTTP_GET {url { path /status_code 200}connect_timeout 3nb_get_retry 3delay_before_retry 3}}
}
[root@web129 ~]# slave配置如下：
[root@web130 ~]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalivedglobal_defs {notification_email {acassen@firewall.locfailover@firewall.locsysadmin@firewall.loc}notification_email_from Alexandre.Cassen@firewall.locsmtp_server 127.0.0.1smtp_connect_timeout 30router_id LVS_DEVEL
}vrrp_instance VI_1 {state BACKUPinterface ens33virtual_router_id 51priority 50advert_int 1authentication {auth_type PASSauth_pass 1111}virtual_ipaddress {192.168.19.200}
}
virtual_server 192.168.19.200 80 {delay_loop 6lb_algo rr lb_kind DRnat_mask 255.255.0.0 persistence_timeout 50protocol TCPreal_server 192.168.19.131 80 {weight 1HTTP_GET {url { path /status_code 200}connect_timeout 3nb_get_retry 3delay_before_retry 3}}real_server 192.168.19.132 80 {weight 1HTTP_GET {url { path /status_code 200}connect_timeout 3nb_get_retry 3delay_before_retry 3}}
}
[root@web130 ~]# 两台RS服务器上执行如下脚本，

[root@web131 ~]# cat lvs_client.sh
#!/bin/bash
#description : start realserver
VIP=192.168.19.200
. /etc/rc.d/init.d/functions
case "$1" in
start)
echo " start LVS of REALServer"
/sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up
echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
;;
stop)
/sbin/ifconfig lo:0 down
echo "close LVS Directorserver"
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
esac
[root@web131 ~]# 重启keepalived：
[root@web129 ~]# systemctl restart keepalived.service
看到有如下进程即可：
[root@web129 ~]# ps aux | grep keepalived
root       2391  0.0  0.1 118080  1368 ?        Ss   23:03   0:00 /usr/sbin/keepalived -D
root       2392  0.0  0.3 120324  3044 ?        S    23:03   0:00 /usr/sbin/keepalived -D
root       2393  0.0  0.2 120204  2352 ?        S    23:03   0:00 /usr/sbin/keepalived -D
root       2411  0.0  0.0 112664   976 pts/0    S+   23:17   0:00 grep --color=auto keepalived
[root@web129 ~]#
[root@web129 ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00inet 127.0.0.1/8 scope host lovalid_lft forever preferred_lft foreverinet6 ::1/128 scope host valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000link/ether 00:0c:29:82:86:6c brd ff:ff:ff:ff:ff:ffinet 192.168.19.129/24 brd 192.168.19.255 scope global ens33valid_lft forever preferred_lft foreverinet 192.168.19.200/32 scope global ens33valid_lft forever preferred_lft foreverinet6 fe80::20c:29ff:fe82:866c/64 scope link valid_lft forever preferred_lft forever
[root@web129 ~]#

做端口转发：未测试
[root@web129 ~]# echo "1">/proc/sys/net/ipv4/ip_forward
[root@web130 ~]# echo "1">/proc/sys/net/ipv4/ip_forward

参考资料：
$ vi /etc/keepalived/keepalived.conf配置信息如下! Configuration File for keepalivedglobal_defs {notification_email {acassen@firewall.loc     #设置报警邮件地址，可以设置多个，每行一个。failover@firewall.loc    #需开启本机的sendmail服务sysadmin@firewall.loc}notification_email_from Alexandre.Cassen@firewall.loc  #设置邮件的发送地址smtp_server 127.0.0.1      #设置smtp server地址smtp_connect_timeout 30    #设置连接smtp server的超时时间router_id LVS_DEVEL        #表示运行keepalived服务器的一个标识。发邮件时显示在邮件主题的信息
}vrrp_instance VI_1 {state MASTER              #指定keepalived的角色，MASTER表示此主机是主服务器，BACKUP表示此主机是备用服务器interface enp0s3     #指定HA监测网络的接口virtual_router_id 51      #虚拟路由标识，这个标识是一个数字，同一个vrrp实例使用唯一的标识。即同一vrrp_instance下，MASTER和BACKUP必须是一致的priority 100              #定义优先级，数字越大，优先级越高，在同一个vrrp_instance下，MASTER的优先级必须大于BACKUP的优先级advert_int 1              #设定MASTER与BACKUP负载均衡器之间同步检查的时间间隔，单位是秒authentication {          #设置验证类型和密码auth_type PASS        #设置验证类型，主要有PASS和AH两种auth_pass 1111        #设置验证密码，在同一个vrrp_instance下，MASTER与BACKUP必须使用相同的密码才能正常通信}virtual_ipaddress {       #设置虚拟IP地址，可以设置多个虚拟IP地址，每行一个192.168.137.100 }
}virtual_server 192.168.137.100 80 {  #设置虚拟服务器，需要指定虚拟IP地址和服务端口，IP与端口之间用空格隔开delay_loop 6              #设置运行情况检查时间，单位是秒lb_algo rr                #设置负载调度算法，这里设置为rr，即轮询算法lb_kind DR                #设置LVS实现负载均衡的机制，有NAT、TUN、DR三个模式可选nat_mask 255.255.255.0 persistence_timeout 0    #会话保持时间，单位是秒。这个选项对动态网页是非常有用的，为集群系统中的session共享提供了一个很好的解决方案。#有了这个会话保持功能，用户的请求会被一直分发到某个服务节点，直到超过这个会话的保持时间。#需要注意的是，这个会话保持时间是最大无响应超时时间，也就是说，用户在操作动态页面时，如果50秒内没有执行任何操作#那么接下来的操作会被分发到另外的节点，但是如果用户一直在操作动态页面，则不受50秒的时间限制protocol TCP              #指定转发协议类型，有TCP和UDP两种real_server 192.168.137.5 80 { #配置服务节点1，需要指定real server的真实IP地址和端口，IP与端口之间用空格隔开weight 1              #配置服务节点的权值，权值大小用数字表示，数字越大，权值越高，设置权值大小可以为不同性能的服务器#分配不同的负载，可以为性能高的服务器设置较高的权值，而为性能较低的服务器设置相对较低的权值，这样才能合理地利用和分配系统资源TCP_CHECK {           #realserver的状态检测设置部分，单位是秒connect_timeout 3    #表示3秒无响应超时nb_get_retry 3       #表示重试次数delay_before_retry 3 #表示重试间隔connect_port 80} }real_server 192.168.137.6 80 {weight 1TCP_CHECK {connect_timeout 3nb_get_retry 3delay_before_retry 3connect_port 80}}
}

测试：
[root@localhost ~]# curl 192.168.19.200
this is server1
[root@localhost ~]# curl 192.168.19.200
this is server2
[root@localhost ~]# curl 192.168.19.200
this is server1
[root@localhost ~]# curl 192.168.19.200
this is server2
[root@localhost ~]# 停掉RS2的httpd服务：
[root@localhost ~]# curl 192.168.19.200
this is server1
[root@localhost ~]# curl 192.168.19.200
curl: (7) Failed connect to 192.168.19.200:80; 拒绝连接
[root@localhost ~]# curl 192.168.19.200
this is server1
[root@localhost ~]# curl 192.168.19.200
this is server1
[root@localhost ~]# curl 192.168.19.200