介绍

Linux：keepalived 双热备份（基础备份web）_鲍海超-GNUBHCkalitarro的博客-CSDN博客https://blog.csdn.net/w14768855/article/details/132815057?spm=1001.2014.3001.5501

环境

一台 centos7 keepalived ipvsadm （主服务器） 192.168.254.1

一台 centos7 keepalived ipvsadm （备份服务器） 192.168.254.2

漂移ip ： 192.168.254.66

一台 centos7 web （web1） 192.168.254.3

一台 centos7 web （web2） 192.168.254.3

在主服务器上的配置

yum -y install keepalived ipvsadm

systemctl enable keepalived.service

mv /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak

vim /etc/keepalived/keepalived.conf

写入

bal_defs {
   router_id tarro1
}


vrrp_instance VI_1 {
    state MASTER
    interface ens33
    virtual_router_id 1
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 123123
    }
    virtual_ipaddress {
        192.168.254.66

    }
}

virtual_server 192.168.254.66 80 {
        delay_loop 15
        lb_algo rr
        lb_kind DR
        protocol TCP

                real_server 192.168.254.3 80 {
        weight 1
        TCP_CHECK {
                connect_port 80
                connect_timeout 3
                nb_get_retry 3
                delay_before_retry 4
                }
        }


                real_server 192.168.254.4 80 {
        weight 1
        TCP_CHECK {
                connect_port 80
                connect_timeout 3
                nb_get_retry 3
                delay_before_retry 4
                }
        }
}

systemctl restart keepalived

modprobe ip_vs

echo "modprobe ip_vs" >>/etc/rc.local

备份服务器上的配置

yum -y install ipvsadm keepalived

systemctl enable keepalived.service

mv /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak

vim /etc/keepalived/keepalived.conf

写入

bal_defs {
   router_id tarro2
}


vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    virtual_router_id 1
    priority 90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 123123
    }
    virtual_ipaddress {
        192.168.254.66

    }
}

virtual_server 192.168.254.66 80 {
        delay_loop 15
        lb_algo rr
        lb_kind DR 
        protocol TCP
    
                real_server 192.168.254.3 80 {
        weight 1
        TCP_CHECK {
                connect_port 80
                connect_timeout 3
                nb_get_retry 3
                delay_before_retry 4
                }
        }


                real_server 192.168.254.4 80 {
        weight 1
        TCP_CHECK {
                connect_port 80
                connect_timeout 3
                nb_get_retry 3
                delay_before_retry 4
                }
        }
}

modprobe ip_vs

echo "modprobe ip_vs" >>/etc/rc.local

systemctl restart keepalived

web1服务器配置

yum -y install httpd

systemctl enable httpd

systemctl start httpd

echo "<h1>192.168.254.3" > /var/www/html/index.html

vim /etc/sysconfig/network-scripts/ifcfg-lo:0

写入

DEVICE=lo:0
IPADDR=192.168.254.66
NETMASK=255.255.255.255
ONBOOT=yes

systemctl restart network

echo "route add -host 192.168.254.66 dev lo:0" >>/etc/rc.local

route add -host 192.168.254.66 dev lo:0

vim /etc/sysctl.conf

末尾插入

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

web2服务器配置

yum -y install httpd

systemctl enable httpd

systemctl start httpd

echo "<h1>192.168.254.4" > /var/www/html/index.html

vim /etc/sysconfig/network-scripts/ifcfg-lo:0

写入

DEVICE=lo:0
IPADDR=192.168.254.66
NETMASK=255.255.255.255
ONBOOT=yes

systemctl restart network

echo "route add -host 192.168.254.66 dev lo:0" >>/etc/rc.local

route add -host 192.168.254.66 dev lo:0

vim /etc/sysctl.conf

末尾插入

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