lvs与keepalive实践

LVS：

node01:
ifconfig eth0:8 192.168.150.100/24
node02~node03:
1)修改内核：
echo 1 > /proc/sys/net/ipv4/conf/eth0/arp_ignore
echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
echo 2 > /proc/sys/net/ipv4/conf/eth0/arp_announce
echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
2）设置隐藏的vip：
ifconfig lo:3 192.168.150.100 netmask 255.255.255.255

RS中的服务：
node02~node03:
yum install httpd -y
service httpd start
vi /var/www/html/index.html
from 192.168.150.1x

LVS服务配置
node01:
yum install ipvsadm
ipvsadm -A -t 192.168.150.100:80 -s rr
ipvsadm -a -t 192.168.150.100:80 -r 192.168.150.12 -g -w 1
ipvsadm -a -t 192.168.150.100:80 -r 192.168.150.13 -g -w 1
ipvsadm -ln

验证：
浏览器访问 192.168.150.100 看到负载疯狂F5
node01：
netstat -natp 结论看不到socket连接
node02~node03:
netstat -natp 结论看到很多的socket连接
node01:
ipvsadm -lnc 查看偷窥记录本
TCP 00:57 FIN_WAIT 192.168.150.1:51587 192.168.150.100:80 192.168.150.12:80
FIN_WAIT：连接过，偷窥了所有的包
SYN_RECV：基本上lvs都记录了，证明lvs没事，一定是后边网络层出问题

keepalived实验：
主机： node01~node04

node01:
ipvsadm -C
ifconfig eth0:8 down

----------------------------
node01,node04:
yum install keepalived ipvsadm -y
配置：
cd /etc/keepalived/
cp keepalived.conf keepalived.conf.bak
vi keepalived.conf
node01:
vrrp：虚拟路由冗余协议！
vrrp_instance VI_1 {
state MASTER // node04 BACKUP
interface eth0
virtual_router_id 51
priority 100 // node04 50
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.150.100/24 dev eth0 label eth0:3
}
}
virtual_server 192.168.150.100 80 {
delay_loop 6
lb_algo rr
lb_kind DR
nat_mask 255.255.255.0
persistence_timeout 0
protocol TCP

real_server 192.168.150.12 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
real_server 192.168.150.13 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
scp ./keepalived.conf root@node04:`pwd`