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Linux集群架构（下）——DR模式、keepalived+LVS

發布時間：2025/4/16 linux 41 豆豆

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Linux集群架構（下）

八、DR模式搭建

8.1 準備工作

試驗需求三臺機器:

分發器，也叫調度器（簡寫為dir) ： 192.168.112.136 ying01
rs1 ：192.168.112.138 ying02
rs2 ：192.168.112.139 ying03
vip ：192.168.112.200

ying01上設置

新建lvs_dr腳本，按下面內容配置

[root@ying01 ~]# vim /usr/local/sbin/lvs_dr.sh#! /bin/bash echo 1 > /proc/sys/net/ipv4/ip_forward ipv=/usr/sbin/ipvsadm vip=192.168.112.200 rs1=192.168.112.138 rs2=192.168.112.139 #注意這里的網卡名字 ifdown wns33 ifup ens33 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 wrr $ipv -a -t $vip:80 -r $rs1:80 -g -w 1 $ipv -a -t $vip:80 -r $rs2:80 -g -w 1

執行腳本，查看IP，發現vip在ens33上

[root@ying01 ~]# sh /usr/local/sbin/lvs_dr.sh 成功斷開設備 'ens33'。連接已成功激活（D-Bus 活動路徑：/org/freedesktop/NetworkManager/ActiveConnection/3） [root@ying01 ~]# ip add 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00inet 127.0.0.1/8 scope host lovalid_lft forever preferred_lft foreverinet6 ::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 1000link/ether 00:0c:29:87:3f:91 brd ff:ff:ff:ff:ff:ffinet 192.168.112.136/24 brd 192.168.112.255 scope global ens33valid_lft forever preferred_lft foreverinet 192.168.112.200/32 brd 192.168.112.200 scope global ens33:2valid_lft forever preferred_lft foreverinet 192.168.112.158/24 brd 192.168.112.255 scope global secondary ens33:0valid_lft forever preferred_lft foreverinet6 fe80::16dc:89c:b761:e115/64 scope link valid_lft forever preferred_lft forever 3: ens37: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000link/ether 00:0c:29:87:3f:9b brd ff:ff:ff:ff:ff:ffinet 192.168.24.128/24 brd 192.168.24.255 scope global dynamic ens37valid_lft 1434sec preferred_lft 1434secinet6 fe80::ad38:a02e:964e:1b93/64 scope link valid_lft forever preferred_lft forever

ying02上

先把網關改為：192.168.112.2，重啟網絡

[root@ying02 ~]# vim /etc/sysconfig/network-scripts/ifcfg-ens33 GATEWAY=192.168.112.2[root@ying02 ~]# systemctl restart network

新建lvs_rs腳本；

[root@ying02 ~]# vim /usr/local/sbin/lvs_rs.sh#/bin/bash vip=192.168.112.200 #把vip綁定在lo上，是為了實現rs直接把結果返回給客戶端 ifdown lo ifup lo ifconfig lo:0 $vip broadcast $vip netmask 255.255.255.255 up route add -host $vip lo:0 #以下操作為更改arp內核參數，目的是為了讓rs順利發送mac地址給客戶端 #參考文檔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

執行腳本，并route -n ，查看網絡信息

[root@ying02 ~]# sh /usr/local/sbin/lvs_rs.sh [root@ying02 ~]# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 192.168.112.2 0.0.0.0 UG 100 0 0 ens33 192.168.112.0 0.0.0.0 255.255.255.0 U 100 0 0 ens33 192.168.112.200 0.0.0.0 255.255.255.255 UH 0 0 0 lo [root@ying02 ~]# ip add 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00inet 127.0.0.1/8 scope host lovalid_lft forever preferred_lft foreverinet 192.168.112.200/32 brd 192.168.112.200 scope global lo:0valid_lft forever preferred_lft foreverinet6 ::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 1000link/ether 00:0c:29:c6:2c:24 brd ff:ff:ff:ff:ff:ffinet 192.168.112.138/24 brd 192.168.112.255 scope global ens33valid_lft forever preferred_lft foreverinet6 fe80::964f:be22:ddf2:54b7/64 scope link valid_lft forever preferred_lft forever 3: ens37: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000link/ether 00:0c:29:c6:2c:2e brd ff:ff:ff:ff:ff:ff

ying03

先把網關改為：192.168.112.2，重啟網絡

[root@ying03 ~]# vim /etc/sysconfig/network-scripts/ifcfg-ens33 [root@ying03 ~]# systemctl restart network

新建lvs_rs腳本；

[root@ying03 ~]# vim /usr/local/sbin/lvs_rs.sh#/bin/bash vip=192.168.112.200 ifdown lo ifup lo #把vip綁定在lo上，是為了實現rs直接把結果返回給客戶端 ifconfig lo:0 $vip broadcast $vip netmask 255.255.255.255 up route add -host $vip lo:0 #以下操作為更改arp內核參數，目的是為了讓rs順利發送mac地址給客戶端 #參考文檔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

8.2 測試

執行腳本，vip在lo網卡上

[root@ying03 ~]# sh /usr/local/sbin/lvs_rs.sh [root@ying03 ~]# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 192.168.112.2 0.0.0.0 UG 100 0 0 ens33 192.168.112.0 0.0.0.0 255.255.255.0 U 100 0 0 ens33 192.168.112.200 0.0.0.0 255.255.255.255 UH 0 0 0 lo [root@ying03 ~]# ip add 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00inet 127.0.0.1/8 scope host lovalid_lft forever preferred_lft foreverinet 192.168.112.200/32 brd 192.168.112.200 scope global lo:0valid_lft forever preferred_lft foreverinet6 ::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 1000link/ether 00:0c:29:ed:0f:50 brd ff:ff:ff:ff:ff:ffinet 192.168.112.139/24 brd 192.168.112.255 scope global ens33valid_lft forever preferred_lft foreverinet6 fe80::43bd:36bd:3f01:f8e8/64 scope link valid_lft forever preferred_lft foreverinet6 fe80::964f:be22:ddf2:54b7/64 scope link tentative dadfailed valid_lft forever preferred_lft forever 3: ens37: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000link/ether 00:0c:29:ed:0f:5a brd ff:ff:ff:ff:ff:ff

在瀏覽器測試，輸入VIP：192.168.112.100；不斷刷新瀏覽器；會出現ying02或者ying03頁面

通過ipvsadm -ln查看規則，可以看出其信息；

九、 keepalived+LVS

編輯配置文件，把之前的內容清空，按下面配置

[root@ying01 ~]# vim /etc/keepalived/keepalived.conf vrrp_instance VI_1 {#備用服務器上為 BACKUPstate MASTER#綁定vip的網卡為ens33interface ens33virtual_router_id 51#備用服務器上為90priority 100advert_int 1authentication {auth_type PASSauth_pass aminglinux}virtual_ipaddress {192.168.112.200} } virtual_server 192.168.112.200 80 {#(每隔10秒查詢realserver狀態)delay_loop 10#(lvs 算法)lb_algo wlc#(DR模式)lb_kind DR#(同一IP的連接60秒內被分配到同一臺realserver)persistence_timeout 60#(用TCP協議檢查realserver狀態)protocol TCPreal_server 192.168.112.138 80 {#(權重)weight 100TCP_CHECK {#(10秒無響應超時)connect_timeout 10nb_get_retry 3delay_before_retry 3connect_port 80}}real_server 192.168.112.139 80 {weight 100TCP_CHECK {connect_timeout 10nb_get_retry 3delay_before_retry 3connect_port 80}} }

查看網卡IP

[root@ying01 ~]# ip add 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00inet 127.0.0.1/8 scope host lovalid_lft forever preferred_lft foreverinet6 ::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 1000link/ether 00:0c:29:87:3f:91 brd ff:ff:ff:ff:ff:ffinet 192.168.112.136/24 brd 192.168.112.255 scope global ens33valid_lft forever preferred_lft foreverinet 192.168.112.158/24 brd 192.168.112.255 scope global secondary ens33:0valid_lft forever preferred_lft foreverinet6 fe80::16dc:89c:b761:e115/64 scope link valid_lft forever preferred_lft forever 3: ens37: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000link/ether 00:0c:29:87:3f:9b brd ff:ff:ff:ff:ff:ffinet 192.168.24.128/24 brd 192.168.24.255 scope global dynamic ens37valid_lft 1216sec preferred_lft 1216secinet6 fe80::ad38:a02e:964e:1b93/64 scope link valid_lft forever preferred_lft forever

ipvsadm -ln ：查看其規則，開啟與未開啟keepalived服務對比；

[root@ying01 ~]# ipvsadm -ln IP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler Flags-> RemoteAddress:Port Forward Weight ActiveConn InActConn [root@ying01 ~]# systemctl start keepalived [root@ying01 ~]# ipvsadm -ln IP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler Flags-> RemoteAddress:Port Forward Weight ActiveConn InActConn TCP 192.168.112.200:80 wlc persistent 60-> 192.168.112.138:80 Route 100 0 0 -> 192.168.112.139:80 Route 100 0 0

開展執行其腳本；做實驗，不斷刷新瀏覽器；

[root@ying01 ~]# sh /usr/local/sbin/lvs_dr.sh 成功斷開設備 'ens33'。連接已成功激活（D-Bus 活動路徑：/org/freedesktop/NetworkManager/ActiveConnection/7） [root@ying01 ~]# ipvsadm -ln IP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler Flags-> RemoteAddress:Port Forward Weight ActiveConn InActConn TCP 192.168.112.200:80 wrr-> 192.168.112.138:80 Route 1 0 3 -> 192.168.112.139:80 Route 1 0 3

假如ying03宕機了，我們把ying03機器關閉；此時能夠剔除ying03機器；

恢復ying03機器，規則里面有添加上ying03

轉載于:https://my.oschina.net/u/3851633/blog/1861307

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