linux CentOS7 keepalived+LVS(DR)搭建部署

一、作用

二、环境简介

三、操作步骤

一、作用

使用keepalived解决lvs的单点故障

高可用集群

二、环境简介

1.准备6台虚拟机，2台做LVS主备调度器，2台做web服务器，1台做存储，1台客户机验证

2.LVS主备调度器 master（192.168.1.106）backup（192.168.1.110）

3.web1（192.168.1.120）web2（192.168.1.128）

4.存储（192.168.1.121）

5.客户机（192.168.1.140）

6.虚拟ip（192.168.1.156）

三、操作步骤

部署web服务器
调整web1与web2的ARP参数

vim /etc/sysctl.conf

net.ipv4.conf.all.arp_ignore=1
net.ipv4.conf.all.arp_announce=2
net.ipv4.conf.default.arp_ignore=1
net.ipv4.conf.default.arp_announce = 2
net.ipv4.conf.lo.arp_ignore = 1
net.ipv4.conf.lo.arp_announce=2

sysctl -p

web1与web2安装 http

yum -y install httpd

web1与web2分别写一个index.html用于测试（/var/www/html/ ）httpd的网站根目录

echo "web1" >/var/www/html/index.html

echo "web2" >/var/www/html/index.html

web1与web2创建虚拟ip

cd /etc/sysconfig/network-scripts/

cp ifcfg-lo ifcfg-lo:0

DEVICE=lo:0
IPADDR=192.168.1.156
NETMASK=255.255.255.255
ONBOOT=yes
NAME=loopback:0

重启网卡（可以看到下图已经创建成功）

systemctl restart network

ip a查看

web1与web2添加回环路由

route add -host 192.168.1.156/32 dev lo:0

route -n 查看

启用httpd

systemctl start httpd

部署LVS主备调度器
调整master和backup的ARP参数（一致）

vim /etc/sysctl.conf

net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.send_redirects=0
net.ipv4.conf.ens33.send_redirects = 0

sysctl -p

master和backup安装 keepalived ipvsadm（一致）

yum install -y keepalived ipvsadm

配置keepalived master（红色字体master和backup不一致的地方）

vim /etc/keepalived/keepalived.conf

【进去之后除了第一行全部删掉】

global_defs {
router_id LVS_DEVEL1
}

vrrp_instance master {
state MASTER
interface ens33
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.156
}
}

virtual_server 192.168.1.156 80 {
delay_loop 6
lb_algo rr
lb_kind DR
#persistence_timeout 50
protocol TCP

real_server 192.168.1.120 80 {
weight 1
HTTP_GET {
url {
path /
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
real_server 192.168.1.128 {
weight 1
HTTP_GET {
url {
path /
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}

配置keepalived backup

global_defs {
router_id LVS_DEVEL2
}

vrrp_instance backup {
state BACKUP
interface ens33
virtual_router_id 51
priority 99
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.156
}
}

virtual_server 192.168.1.156 80 {
delay_loop 6
lb_algo rr
lb_kind DR
#persistence_timeout 50
protocol TCP

real_server 192.168.1.120 80 {
weight 1
HTTP_GET {
url {
path /
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
real_server 192.168.1.128 80 {
weight 1
HTTP_GET {
url {
path /
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}