LVS DR模式搭建keepalived + LVS

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18.11 LVS DR模式搭建

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)
    分发器:192.168.21.130/24
    rs1:192.168.21.132/24
    rs2:192.168.21.133/24
    vip:192.168.21.200/24

  • dir上编写脚本 vim /usr/local/sbin/lvs_dr.sh //内容如下
#! /bin/bash
echo 1 > /proc/sys/net/ipv4/ip_forward
ipv=/usr/sbin/ipvsadm
vip=192.168.21.200
rs1=192.168.21.132
rs2=192.168.21.133
#ifdown ifup 同等于重启网卡,对虚拟网卡进行重置
#防止再次启动脚本的时候,再次设置虚拟网卡的IP地址
ifdown ens33
ifup ens33
#注意这里的网卡名字
ifconfig ens33:2 $vip broadcast $vip netmask 255.255.255.255 up
route 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
  • 启动脚本
[[email protected] ~]# 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/4)
  • 两台rs上也编写脚本 vim /usr/local/sbin/lvs_rs.sh //内容如下
#! /bin/bash
vip=192.168.21.200
ifdown lo
ifup lo
#把vip绑定在lo上,是为了实现rs直接把结果返回给客户端
ifconfig lo:0 $vip broadcast $vip netmask 255.255.255.255 up
route add -host $vip lo:0
#以下操作为更改arp内核参数,目的是为了让rs顺利发送mac地址给客户端
#参考文档 www.cnblogs.com/lgfeng/archive/2012/10/16/2726308.html
echo "1" > /proc/sys/net/ipv4/conf/lo/arp_ignore
echo "2" > /proc/sys/net/ipv4/conf/lo/arp_announce
echo "1" > /proc/sys/net/ipv4/conf/all/arp_ignore
echo "2" > /proc/sys/net/ipv4/conf/all/arp_announce
  • 启动脚本
[[email protected] ~]# sh !$
sh /usr/local/sbin/lvs_rs.sh
  • 查看路由

技术分享图片

技术分享图片

  • 测试

技术分享图片
技术分享图片

[[email protected] ~]# ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  192.168.21.200:80 rr
  -> 192.168.21.132:80            Route   1      0          0         
  -> 192.168.21.133:80            Route   1      0          0         

18.12 keepalived + LVS

Keepalived + LVS DR

  • 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
[[email protected] ~]# yum install -y 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)192.168.21.130/24
  • rs1 192.168.21.132/24
  • rs2 192.168.21.133/24
  • vip 192.168.21.200/32
  • 编辑keepalived配置文件 vim /etc/keepalived/keepalived.conf //内容如下
vrrp_instance VI_1 {
    #备用服务器上为 BACKUP
    state 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 ens33
    virtual_router_id 51
    #备用服务器上为90
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass aminglinux
    }
    virtual_ipaddress {
        192.168.21.200
    }
}
virtual_server 192.168.21.200 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 0
    #(用TCP协议检查realserver状态)
    protocol TCP
    real_server 192.168.21.132 80 {
        #(权重)
        weight 100
        TCP_CHECK {
        #(10秒无响应超时)
        connect_timeout 10
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
        }
    }
    real_server 192.168.21.133 80 {
        weight 100
        TCP_CHECK {
        connect_timeout 10
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
        }
     }
}
  • 启动 keepalived
[[email protected] etc]# systemctl start keepalived

[[email protected] etc]# ps aux |grep keepalived
root       1615  0.0  0.1 120740  1408 ?        Ss   17:23   0:00 /usr/sbin/keepalived -D
root       1616  0.0  0.3 127480  3336 ?        S    17:23   0:00 /usr/sbin/keepalived -D
root       1617  0.0  0.2 131780  2944 ?        S    17:23   0:00 /usr/sbin/keepalived -D
root       1623  0.0  0.0 112676   976 pts/0    R+   17:25   0:00 grep --color=auto keepalived
  • 执行ipvsadm -C 把之前的ipvsadm规则清空掉
  • 两台rs上,依然要执行/usr/local/sbin/lvs_rs.sh脚本
    脚本在DR模式搭建小节
  • keepalived有一个比较好的功能,可以在一台rs宕机时,不再把请求转发过去
  • 测试
    
    [[email protected] etc]# systemctl stop keepalived
    [[email protected] etc]# ip add
    1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
    2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:a3:53:bf brd ff:ff:ff:ff:ff:ff
    inet 192.168.21.130/24 brd 192.168.21.255 scope global ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::7d:8138:e13a:91e5/64 scope link 
       valid_lft forever preferred_lft forever
    [[email protected] etc]# ipvsadm -ln
    IP Virtual Server version 1.2.1 (size=4096)
    Prot LocalAddress:Port Scheduler Flags
    -> RemoteAddress:Port           Forward Weight ActiveConn InActConn

[[email protected] etc]# systemctl start keepalived
[[email protected] etc]# ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 192.168.21.200:80 wlc
-> 192.168.21.132:80 Route 100 0 0
-> 192.168.21.133:80 Route 100 0 0

#关掉 rs2
[[email protected] ~]# systemctl stop nginx

[email protected] etc]# ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 192.168.21.200:80 wlc
-> 192.168.21.132:80 Route 100 0 0
#有间隔10s

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