为什么80%的码农都做不了架构师？>>>
LVS DR模式搭建
准备工作：三台机器
分发器，也叫调度器（简写为dir）：192.168.248.128
rs1 ：192.168.248.129
rs2 : 192.168.248.130
vip : 192.168.248.200
1.dir上编辑脚本文件**/usr/local/sbin/lvs_dr.sh**，文件内容如下：
#! /bin/bashecho 1 > /proc/sys/net/ipv4/ip_forward #打开端口转发ipv=/usr/sbin/ipvsadmvip=192.168.248.200rs1=192.168.248.132rs2=192.168.248.133#注意这里的网卡名字#绑定vipifdown ens33ifup ens33ifconfig ens33:2 $vip broadcast $vip netmask 255.255.255.255 uproute add -host $vip dev ens33:2$ipv -C$ipv -A -t $vip:80 -s rr$ipv -a -t $vip:80 -r $rs1:80 -g -w 1$ipv -a -t $vip:80 -r $rs2:80 -g -w 1
2.执行脚本
[root@yolks-001 ~]# sh /usr/local/sbin/lvs_dr.sh成功断开设备 'ens33'。连接已成功激活（D-Bus 活动路径：/org/freedesktop/NetworkManager/ActiveConnection/5）
3.rs机器也需要编辑配置文件，添加脚本文件**/usr/local/sbin/lvs_rs.sh**，内容如下：
#/bin/bashvip=192.168.248.200#把vip绑定在lo上，是为了实现rs直接把结果返回给客户端ifdown loifup loifconfig lo:0 $vip broadcast $vip netmask 255.255.255.255 uproute add -host $vip lo:0#以下操作为更改arp内核参数，目的是为了让rs顺利发送mac地址给客户端#参考文档/lgfeng/archive//10/16/2726308.htmlecho "1" >/proc/sys/net/ipv4/conf/lo/arp_ignoreecho "2" >/proc/sys/net/ipv4/conf/lo/arp_announceecho "1" >/proc/sys/net/ipv4/conf/all/arp_ignoreecho "2" >/proc/sys/net/ipv4/conf/all/arp_announce
4.测试查看活动状态
keepalived + LVS
完整架构需要两台服务器（角色为dir）分别安装keepalived软件，目的是实现高可用，但keepalived本身也有负载均衡的功能，所以本次实验可以只安装一台keepalived
keepalived内置了ipvsadm的功能，所以不需要再安装ipvsadm包，也不用编写和执行那个lvs_dir的脚本
三台机器分别为：
dir（安装keepalived）192.168.248.128
rs1 192.168.248.129
rs2 192.168.248.130
vip 192.168.248.200
1.编辑keepalived配置文件/etc/keepalived/keepalived.conf,内容如下：
vrrp_instance VI_1 {#备用服务器上为 BACKUPstate MASTER#绑定vip的网卡为ens33，你的网卡和阿铭的可能不一样，这里需要你改一下interface ens33virtual_router_id 51#备用服务器上为90priority 100advert_int 1authentication {auth_type PASSauth_pass aminglinux}virtual_ipaddress {192.168.248.200}}virtual_server 192.168.248.200 80 {#(每隔10秒查询realserver状态)delay_loop 10#(lvs 算法)lb_algo wlc#(DR模式)lb_kind DR#(同一IP的连接60秒内被分配到同一台realserver)persistence_timeout 60#(用TCP协议检查realserver状态)protocol TCPreal_server 192.168.248.129 80 {#(权重)weight 100TCP_CHECK {#(10秒无响应超时)connect_timeout 10nb_get_retry 3delay_before_retry 3connect_port 80}}real_server 192.168.248.130 80 {weight 100TCP_CHECK {connect_timeout 10nb_get_retry 3delay_before_retry 3connect_port 80}}}
2.dir上重启keepalived
systemctl stop keepalivedsystemctl start keepalived
3.查看keepalived规则
[root@yolks-001 ~]# ipvsadm -lnIP Virtual Server version 1.2.1 (size=4096)Prot LocalAddress:Port Scheduler Flags-> RemoteAddress:Port Forward Weight ActiveConn InActConnTCP 192.168.248.200:80 wlc persistent 60-> 192.168.248.129:80 Route 100 00 -> 192.168.248.130:80 Route 100 00
4.停止掉rs3机器的nginx
systemctl stop nginx
5.dir机器再次查看keepalived规则:已经少了停掉的rs2机器的规则
[root@yolks-001 ~]# ipvsadm -lnIP Virtual Server version 1.2.1 (size=4096)Prot LocalAddress:Port Scheduler Flags-> RemoteAddress:Port Forward Weight ActiveConn InActConnTCP 192.168.248.200:80 wlc persistent 60-> 192.168.248.129:80 Route 100 00
拓展
haproxy+keepalived /xrt95050/article/details/40926255
nginx、lvs、haproxy比较 /article/-07-24/2820837
keepalived中自定义脚本 vrrp_script /hncscwc/blog/158746
lvs dr模式只使用一个公网ip的实现方法 http://storysky./628458/338726
