LVS+Keepalived
使用keepalived的情况下，就不需要在dir上执行/usr/local/sbin/lvs_dr.sh脚本了，只需在rs上执行/usr/local/sbin/lvs_rs.sh，与ipvsadm无关了为了防止其中一台rs宕机而造成无法访问的情况，就需要有一个程序去监测，当一台宕机后，立马就可以把请求调度到其余机器上去，那就是keepalived，相当于是负载均衡和高可用的集合体，非常优秀；keepalived --> HA+LB
需要有4台机器，在dir上做一主一备用于高可用，也就是说有两台负载均衡机器
在dir上：
首先清空ipvsadm规则：ipvsadm -C
在dir上安装keepalived：但是yum安装前需要关闭虚拟IP：ifconfig eth0:0 down, 因为有一个虚拟ip存在
yum install -y keepalived
修改keepalived配置文件:
vim /etc/keepalived/keepalived.conf
主上：
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.237.100
}
}
virtual_server 192.168.237.100 80 {
delay_loop 6
lb_algo rr
lb_kind DR
persistence_timeout 0
protocol TCP
real_server 192.168.237.133 80 {
weight 100
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 192.168.237.137 80 {
weight 100
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
从上：
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 99
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.237.100
}
}
virtual_server 192.168.237.100 80 {
delay_loop 6
lb_algo rr
lb_kind DR
persistence_timeout 0
protocol TCP
real_server 192.168.237.133 80 {
weight 100
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 192.168.237.137 80 {
weight 100
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
启动前的执行命令
dir上：
ipvsadm -C
iptables -t nat -F
echo 1 > /proc/sys/net/ipv4/ip_forward
/etc/init.d/keepalived start
rs上：
sh /usr/local/sbin/lvs_rs.sh
启动后在dir上用ip addr看dir上的IP
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