keepalived是一种几群的高可用软件，可以为我们提供高可用服务，它可以实现心跳监测和浮动资源管理；
它是基于VRRP的的冗余技术；接下来我们进行keepalived+HAproxy的高可用和负载均衡的集群部署；
1.准备好2台虚拟机作为keepalived+Haproxy服务器；2台作为httpd web服务器；
我们在1台keepalived服务器上进行配置，然后再scp到另一台服务器上；
编译源码keepalived；
[root@sxb-1 keepalived-1.3.5]# tar xf keepalived-1.3.5.tar.gz ^C
[root@sxb-1 keepalived-1.3.5]# ./configure –prefix=/usr/local/keepalived^C
make&& maek install
如果失败问题是：OpenSSL is not properly installed on your system；执行：yum -y install openssl-devel
编辑配置文件；
[root@sxb-1keepalived]# pwd/usr/local/keepalived/etc/keepalived
! Configuration File forkeepalived
global_defs {
notification_email {
root@zhaoyg.com #出现问题给she发送邮件
}
notification_email_from keepalived@zhaoyg.com #发件人信息
smtp_server127.0.0.1smtp_connect_timeout30router_id Director1 #这台keppalived的名字
}
vrrp_instance VI_1 {
state MASTERinterfaceens33 #根据自己网卡进行修改
virtual_router_id51priority150advert_int1authentication {
auth_type PASS
auth_pass1111}
virtual_ipaddress {172.29.210.150 /16}
}
我们还需要制作一个keepalived的启动文件；
[root@sxb-1 keepalived]# vim /usr/lib/systemd/system/keepalived.service
[Unit]
Description=LVS and VRRP High Availability Monitor
After=syslog.target network-online.target
[Service]
Type=forking
PIDFile=/var/run/keepalived.pid
KillMode=process
EnvironmentFile=-/usr/local/keepalived/etc/sysconfig/keepalived
ExecStart=/usr/local/keepalived/sbin/keepalived -f /usr/local/keepalived/etc/keepalived/keepalived.conf $KEEPALIVED_OPTIONS
ExecReload=/bin/kill -HUP $MAINPID
[Install]
WantedBy=multi-user.target
我们将keepalived ，启动文件scp到另一台服务器上，修改一下就可以了；
[root@sxb-1 keepalived]# scp -r /usr/local/keepalived/ 192.168.88.104:/usr/loca
我们来到另一台服务器上
! Configuration File forkeepalived
global_defs {
notification_email {
songxuebin128@163.com
}
notification_email_from localhost@uplooking.com
smtp_server127.0.0.1smtp_connect_timeout30router_id haproxy2
vrrp_skip_check_adv_addr
vrrp_strict
vrrp_garp_interval0vrrp_gna_interval0}
vrrp_instance VI_1 {
state BACKUPinterfaceens33
virtual_router_id51priority50advert_int1authentication {
auth_type PASS
auth_pass1111}
virtual_ipaddress {192.168.88.230dev ens33
}
}
启动keppalived；
我们的master上出现了我们当时使用的浮动IP192.168.88.230
[root@sxb-1keepalived]# ip addr s1: lo: mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00inet127.0.0.1/8scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128scope host
valid_lft forever preferred_lft forever2: ens33: mtu 1500 qdisc pfifo_fast state UP group default qlen 1000link/ether 00:0c:29:88:9d:40brd ff:ff:ff:ff:ff:ff
inet192.168.88.101/24 brd 192.168.88.255 scope globalnoprefixroute ens33
valid_lft forever preferred_lft forever
inet192.168.88.230/32 scope globalens33
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fe88:9d40/64scope link
valid_lft forever preferred_lft forever
我们用httpd服务进行测试；
[root@105 ~]# curl 192.168.88.230
103[root@105 ~]# curl 192.168.88.230
102[root@105 ~]# curl 192.168.88.230
103[root@105 ~]# curl 192.168.88.230
102
现在我们将master停掉，来测试
[root@sxb-1 keepalived]# systemctl stop keepalived.service
查看一下BACKUP的浮动IP，可以看到过来了；
[root@sxb-4 ~]# ip addr s1: lo: mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00inet127.0.0.1/8scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128scope host
valid_lft forever preferred_lft forever2: ens33: mtu 1500 qdisc pfifo_fast state UP group default qlen 1000link/ether 00:0c:29:5b:71:db brd ff:ff:ff:ff:ff:ff
inet192.168.88.104/24 brd 192.168.88.255 scope globalnoprefixroute ens33
valid_lft forever preferred_lft forever
inet192.168.88.230/24 scope globalsecondary ens33
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fe5b:71db/64scope link
valid_lft forever preferred_lft forever
我们继续测试；master故障后并没有影响我们的HAproxy集群；
[root@105 ~]# curl 192.168.88.230
102[root@105 ~]# curl 192.168.88.230
103[root@105 ~]# curl 192.168.88.230
102[root@105 ~]# curl 192.168.88.230
103
到这里有一个问题；就是keepalived的master恢复后，会出现抢夺问题(“王者归来”)；这里我们就要看实际情况来定夺要不要抢夺，当两台服务器的配置一样，那就不用进行抢夺(forever preferred_lft forever);
我们恢复master浮动IP就会自动回到master上；
[root@sxb-1keepalived]# systemctl start keepalived.service
[root@sxb-1keepalived]# ip addr show1: lo: mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00inet127.0.0.1/8scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128scope host
valid_lft forever preferred_lft forever2: ens33: mtu 1500 qdisc pfifo_fast state UP group default qlen 1000link/ether 00:0c:29:88:9d:40brd ff:ff:ff:ff:ff:ff
inet192.168.88.101/24 brd 192.168.88.255 scope globalnoprefixroute ens33
valid_lft forever preferred_lft forever
inet192.168.88.230/24 scope globalsecondary ens33
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fe88:9d40/64scope link
valid_lft forever preferred_lft forever