20170417-keepalived+lvs-实现高可用负载均衡集群

调度器：

vm15 192.168.122.15

vm16 192.168.122.16

web服务器：

vm17 192.168.122.17

vm18 192.168.122.18

都开启转发 ：

echo "1" > /proc/sys/net/ipv4/ip_forward (临时)

vim /etc/sysctl.conf -> net.ipv4.ip_forward=1 (永久)

sysctl -p 生效

配置好软件仓库

调度器:

vm15:yum install keepalived

一： NAT模式

genhash --server 192.168.122.17 --port 80 -u /var/www/html/index.html

genhash --server 192.168.122.18 --port 80 -u /var/www/html/index.html

得到的hash值填在配置文件digest后面

vim /etc/keepalived/keepalived.conf

vrrp_script chk_keepalived {

script "kill -0 keepalived" 检测keepalived 是否正常运行

interval 2 每2秒检测一次

weight

}

vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 123123
}

track_script {

chk_keepalived

}
virtual_ipaddress {
192.168.122.100
}
}

virtual_server 192.168.122.100 80 {
delay_loop 6
lb_algo rr
lb_kind NAT
nat_mask 255.255.255.0
persistence_timeout 0
protocol TCP

real_server 192.168.122.17 80 {
weight 1
HTTP_GET {
url {
path /var/www/html/index.html
digest ff20ad2481f97b1754ef3e12ecd3a9cc
}

connect_timeout 3
nb_get_retry 3
delay_before_retry

}

}

real_server 192.168.122.18 80 {

weight 1

HTTP_GET {
url {
path /var/www/html/index.html
digest 9b3a0c85a887a256d6939da88aabd8cd
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}

vm16:

vim /etc/keepalived/keepalived.conf

vrrp_script chk_keepalived {

script "kill -0 keepalived" 检测keepalived 是否正常运行

interval 2 每2秒检测一次

weight

}

vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 99
advert_int 1
authentication {
auth_type PASS

auth_pass 123123
}

track_script {

chk_keepalived

}
virtual_ipaddress {
192.168.122.100
}
}

virtual_server 192.168.122.100 80 {
delay_loop 6
lb_algo rr

lb_kind NAT
nat_mask 255.255.255.0
persistence_timeout 0
protocol TCP

real_server 192.168.122.17 80 {
weight 1
HTTP_GET {
url {
path /var/www/html/index.html
digest ff20ad2481f97b1754ef3e12ecd3a9cc
}

connect_timeout 3
nb_get_retry 3
delay_before_retry

}

}

real_server 192.168.122.18 80 {

weight 1

HTTP_GET {
url {
path /var/www/html/index.html
digest 9b3a0c85a887a256d6939da88aabd8cd
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}

保存退出

service keepalived restart

chkconfig keepalived on

vm17 vm18 :

vim /var/www/html/index.html

hello,vm17

vim /var/www/html/index.html

hello,vm18

service httpd restart

vm15 vm16:

ip addr show eth0 看VIP 192.168.122.100产生没有

yum install ipvsadm

运行: ipvsadm 查看后端RS及vm17和vm18产生没有

vm17 vm18:

添加路由规则： 因为这里是NAT

192.168.122这个网段：route add -net 192.168.122.0 netmask 255.255.255.0 gw 192.168.122.100

单个主机： route add -host 192.168.122.19 netmask 255.255.255.255 gw 192.168.122.100

测试： vm19 192.168.122.19

curl 192.168.122.100

可以看到轮循看到：

hello,vm17

hell,vm18

就成功了

二：直接路由模式：

vm15 vm16:

vim /etc/keepalived/keepalived.conf

lb_kind NAT 改为：lb_kind DR

vm17 vm18:

vim lvsrs

将VIP改为调度设置的VIP

#!/bin/bash

#

# lvsrs Startup script for the lvsrs Server

#

# chkconfig: 2345 86 14

# description: lvsrs script. It is used to serve \

#

VIP=192.168.122.100

. /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)

echo "close LVS Directorserver"

/sbin/ifconfig lo:0 down

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

保存退出，

cp lvsrs /etc/init.d/

chmod +x /etc/init.d/lvsrs

service lvsrs start

chkconfig lvsrs on

测试： vm19 192.168.122.19

curl 192.168.122.100

一般都用直接路由模式