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以下是一个 LVS+Keepalived 高可用群集配置案例：

1、环境准备

• LVS 主调度器（lvs1）：IP 地址为 192.168.8.101，心跳 IP 为 192.168.4.101
• LVS 备调度器（lvs2）：IP 地址为 192.168.8.102，心跳 IP 为 192.168.4.102
• 虚拟 IP（vip）：192.168.8.100
• Web 服务器 1（nginx1）：IP 地址为 192.168.8.103
• Web 服务器 2（nginx2）：IP 地址为 192.168.8.104
• 客户端：IP 地址为 192.168.8.1

2、配置步骤

2.1、为lvs1和lvs2配置ip地址

lvs1:配置IP地址

nmcli connection modify ens33 ipv4.method manual ipv4.addresses 192.168.8.101/24
nmcli connection modify ens36 ipv4.method manual ipv4.addresses 192.168.4.101/24
nmcli connection up ens33
nmcli connection up ens36

lvs2:配置IP地址

nmcli connection modify ens33 ipv4.method manual ipv4.addresses 192.168.8.102/24
nmcli connection modify ens36 ipv4.method manual ipv4.addresses 192.168.4.102/24
nmcli connection up ens33
nmcli connection up ens36

2.2、为lvs1和lvs2安装keepalived和ipvsadm并修改配置文件

• 安装：

yum install -y keepalived ipvsadm

• Ivs1的 keepalived 配置文件修改

!configuration file for keepalived
global_defs{router_id cluster1
}
vrrp_instance web{state masterinterface ens33virtual_router_id 51priority 255advert_int 1authentication{auth_type passauth_pass 1111}virtual_ipaddress{192.168.8.100/24}
}
virtual_server 192.168.8.100 80{delay_loop 6lb_algo rrlb_kind drpersistence_timeout 50protocol tcpreal_server 192.168.8.103 80{weight 1tcp_check{connect_timeout 3retry 3delay_before_retry 3}}real_server 192.168.8.104 80{weight 2tcp_check{connect_timeout 3retry 3delay_before_retry 3}}
}

• Ivs2的 keepalived 配置文件修改

! configuration file for keepalived
global_defs{router_id cluster2
}
vrrp_instance web{state backupinterface ens33virtual_router_id 51priority 100advert_int 1authentication{auth_type passauth_pass 1111}virtual_ipaddress{192.168.8.100/24}
}
virtual_server 192.168.8.100 80{delay_loop 6lb_algo rrlb_kind drpersistence_timeout 50protocol tcpreal_server 192.168.8.103 80{weight 1tcp_check{connect_timeout 3retry 3delay_before_retry 3}}real_server 192.168.8.104 80{weight 2tcp_check{connect_timeout 3retry 3delay_before_retry 3}}
}

• 重启服务：在两台lvs上输入

systemctl restart keepalived

3、为后端服务器安装 httpd

web1

安装：yum install -y httpd
写入信息：echo "hello,192.168.8.103" > /usr/share/nginx/html/index.html
启动服务：systemctl enable httpd.service --now

web2

安装：yum install -y httpd
写入信息：echo "hello,192.168.8.104" > /usr/share/nginx/html/index.html
启动服务：systemctl enable httpd.service --now

4、为后端服务器配置IP地址

web1

nmcli con mod ens33 ipv4.address 192.168.8.103/24 ipv4.gateway 192.168.8.2
nmcli con up ens33
增加虚拟接口并配置 vip：nmcli connection add type dummy ifname dummy2 ipv4.method manual ipv4.addresses 192.168.8.100/32
修改内核 arp 配置：cat >>/etc/sysctl.conf<< eof net.ipv4.conf.all.arp_ignore=1 net.ipv4.conf.all.arp_announce=2 eof
刷新配置：sysctl -p

web2

nmcli con mod ens33 ipv4.address 192.168.8.104/24 ipv4.gateway 192.168.8.2
nmcli con up ens33
增加虚拟接口并配置 vip：nmcli connection add type dummy ifname dummy2 ipv4.method manual ipv4.addresses 192.168.8.100/32
修改内核 arp 配置：cat >>/etc/sysctl.conf<< eof net.ipv4.conf.all.arp_ignore=1 net.ipv4.conf.all.arp_announce=2 eof
刷新配置：sysctl -p