拓扑图
安装keepalived
[root@node1 ~]# yum install -y keepalived
修改keepalived MASTER 配置文件
[root@node1 ~]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
[email protected]
[email protected]
[email protected]
}
notification_email_from [email protected]
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state MASTER ##定义主节点
interface eth0
virtual_router_id 51 ##识别虚拟路由的id，相同的id则会被识别为1组
priority 100 ##优先级，优先级高的会选举为主节点
advert_int 1
authentication {
auth_type PASS ##认证方式为PASS 还有AH
auth_pass 1111
}
virtual_ipaddress {
172.16.30.100 ##vip即虚拟IP
}
}
virtual_server 172.16.30.100 80 {
delay_loop 6
lb_algo rr ##调度模式rr,轮询
lb_kind DR ##负载均衡模型为DR 另外还有NAT
persistence_timeout 0 ##超时时长，在每个节点停留的时间，此处设为0，默认为50s，则会在单一节点停留50秒在去另一节点
protocol TCP
real_server 172.16.30.10 80 { ##后端rs主机
weight 1
TCP_CHECK {
connect_port 80 ##连接端口
connect_timeout 3 ##连接超时时间
nb_get_retry 3 ##重试次数
delay_before_retry 3 ##每次重试之间的间隔时间
}
real_server 172.16.30.11 80 {
weight 1
TCP_CHECK {
connect_port 80
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}将配置文件复制到另一节点
[root@node1 ~]# scp /etc/keepalived/keepalived.conf 172.16.30.2:/etc/keepalived/keepalived.conf
修改 state priority 如下图
启动keepalived测试vip
MASTER ip，停掉MASTER keepalived服务
BACKUP ip
VIP成功转移
配置web服务器
安装httpd
[root@node10 ~]# yum install -y httpd
提供网页文件
[root@node10 ~]# vim /var/www/html/index.html <h1>page from node10</h1>
node11同样的操作
配置rs模型
[root@node10 ~]# echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore ##关闭arp转发 [root@node10 ~]# echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore [root@node10 ~]# echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce [root@node10 ~]# echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce [root@node10 ~]# ifconfig lo:0 172.16.30.100 netmask 255.255.255.255 broadcast 172.16.30.100 up ##在lo：0口设置VIP 并只对自己广播 [root@node10 ~]# ifconfig eth0 Link encap:Ethernet HWaddr 08:00:27:02:A7:9A inet addr:172.16.30.10 Bcast:172.16.255.255 Mask:255.255.0.0 inet6 addr: fe80::a00:27ff:fe02:a79a/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:5319 errors:0 dropped:0 overruns:0 frame:0 TX packets:685 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:485435 (474.0 KiB) TX bytes:55938 (54.6 KiB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) lo:0 Link encap:Local Loopback inet addr:172.16.30.100 Mask:255.255.255.255 UP LOOPBACK RUNNING MTU:65536 Metric:1
node11同样操作
分别启动httpd服务
访问测试
现在将node1上的keepalived服务停掉
再次访问还是同样的结果，我们再来看一下node2上的ip，vip已经转移过来了
这样便实现了lvs+keepalived的高可用负载均衡，lvs负责web服务器的负载均衡，而keepalived可以保证lvs不会发生单点故障。