首页 Keepalived教程实战案例: 实现单主的LVS-DR模式

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实战案例: 实现双主的LVS-DR模式

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实战案例
实战案例1:实现单主的LVS-DR模式

准备web服务器并使用脚本绑定VIP至web服务器lo网卡

#准备两台后端RS主机
[root@rs1 ~]#cat lvs_dr_rs.sh
#!/bin/bash
#Author:wangxiaochun
#Date:2017-08-13
vip=10.0.0.10
mask='255.255.255.255'
dev=lo:1
rpm -q httpd &> /dev/null || yum -y install httpd &>/dev/null
service httpd start &> /dev/null && echo "The httpd Server is Ready!"
echo "<h1>hostname</h1>" > /var/www/html/index.html

case 1 in
start)
    echo 1>/proc/sys/net/ipv4/conf/all/arp_ignore
    echo 1>/proc/sys/net/ipv4/conf/lo/arp_ignore
    echo 2>/proc/sys/net/ipv4/conf/all/arp_announce
    echo 2>/proc/sys/net/ipv4/conf/lo/arp_announce
    ifconfigdev vip netmaskmask #broadcast vip up
    #route add -hostvip dev dev
    echo "The RS Server is Ready!"
    ;;
stop)
    ifconfigdev down
    echo 0 > /proc/sys/net/ipv4/conf/all/arp_ignore
    echo 0 > /proc/sys/net/ipv4/conf/lo/arp_ignore
    echo 0 > /proc/sys/net/ipv4/conf/all/arp_announce
    echo 0 > /proc/sys/net/ipv4/conf/lo/arp_announce
    echo "The RS Server is Canceled!"
    ;;
*) 
    echo "Usage: (basename0) start|stop"
    exit 1
    ;;
esac

[root@rs1 ~]#bash lvs_dr_rs.sh start 
The httpd Server is Ready!
The RS Server is Ready!
[root@rs1 ~]#ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    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
    inet 10.0.0.10/32 scope global lo:1
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:32:80:38 brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.7/24 brd 10.0.0.255 scope global noprefixroute eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe32:8038/64 scope link 
       valid_lft forever preferred_lft forever

[root@rs2 ~]#bash lvs_dr_rs.sh start 
The httpd Server is Ready!
The RS Server is Ready!

[root@rs2 ~]#ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    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
    inet 10.0.0.10/32 scope global lo:1
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:33:b4:1a brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.17/24 brd 10.0.0.255 scope global noprefixroute eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe33:b41a/64 scope link 
       valid_lft forever preferred_lft forever

#测试访问两台RS
[root@centos6 ~]#curl 10.0.0.7
<h1>rs1.magedu.org</h1>
[root@centos6 ~]#curl 10.0.0.17
<h1>rs2.magedu.org</h1>

配置keepalived

#ka1节点的配置
[root@ka1-centos8 ~]#cat    /etc/keepalived/keepalived.conf
! Configuration File for keepalived
    global_defs {
        notification_email {
            root@localhost
        }
        notification_email_from keepalived@localhost
        smtp_server 127.0.0.1
        smtp_connect_timeout 30
        router_id ka1.magedu.org
        vrrp_mcast_group4 224.0.100.10
    }
vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 66
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 123456
    }
    virtual_ipaddress {
        10.0.0.10/24 dev eth0 label eth0:1
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"
    }
virtual_server 10.0.0.10 80 {
        delay_loop 3
        lb_algo rr
        lb_kind DR
        protocol TCP
        sorry_server 127.0.0.1 80
        real_server 10.0.0.7 80 {
            weight 1
            HTTP_GET {               #应用层检测
                url {
                    path /
                    status_code 200
                }
                connect_timeout 1
                nb_get_retry 3
                delay_before_retry 1
            }
        }
        real_server 10.0.0.17 80 {
            weight 1 
            TCP_CHECK {              #另一台主机使用TCP检测
                connect_timeout 5
                nb_get_retry 3
                delay_before_retry 3
                connect_port 80
            }
        }
}

#ka2节点的配置,配置和ka1基本相同,只需修改三行
[root@ka2-centos8 ~]#cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived
    global_defs {
        notification_email {
            root@localhost
        }
        notification_email_from keepalived@localhost
        smtp_server 127.0.0.1
        smtp_connect_timeout 30
        router_id ka1.magedu.org             #修改此行
        vrrp_mcast_group4 224.0.100.10
    }
vrrp_instance VI_1 {
    state BACKUP                            #修改此行
    interface eth0
    virtual_router_id 66
    priority 80                             #修改此行
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 123456
    }
    virtual_ipaddress {
        10.0.0.10/24 dev eth0 label eth0:1
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"
    }
virtual_server 10.0.0.10 80 {
        delay_loop 3
        lb_algo rr
        lb_kind DR
        protocol TCP
        sorry_server 127.0.0.1 80
        real_server 10.0.0.7 80 {
            weight 1
            HTTP_GET {
                url {
                    path /
                    status_code 200
                }
                connect_timeout 1
                nb_get_retry 3
                delay_before_retry 1
            }
        }
        real_server 10.0.0.17 80 {
            weight 1
            TCP_CHECK {
                connect_timeout 5
                nb_get_retry 3
                delay_before_retry 3
                connect_port 80
            }
        }
}

访问测试结果

[root@centos6 ~]#curl 10.0.0.10
<h1>rs1.magedu.org</h1>
[root@centos6 ~]#curl 10.0.0.10
<h1>rs2.magedu.org</h1>

[root@ka1-centos8 ~]#dnf -y install ipvsadm
[root@ka1-centos8 ~]#ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  10.0.0.10:80 rr
  -> 10.0.0.7:80                  Route   1      0          0         
  -> 10.0.0.17:80                 Route   1      0          0   

模拟故障

#第一台RS1故障,自动切换至RS2
[root@rs1 ~]#chmod 0 /var/www/html/index.html 

[root@centos6 ~]#curl 10.0.0.10
<h1>rs2.magedu.org</h1>
[root@centos6 ~]#curl 10.0.0.10
<h1>rs2.magedu.org</h1>

[root@ka1-centos8 ~]#dnf -y install ipvsadm
[root@ka1-centos8 ~]#ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  10.0.0.10:80 rr
  -> 10.0.0.17:80                 Route   1      0          3  

#后端RS服务器都故障,启动Sorry Server
[root@rs2 ~]#systemctl stop httpd
[root@centos6 ~]#curl 10.0.0.10
Sorry Server on ka1
[root@ka1-centos8 ~]#ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  10.0.0.10:80 rr
  -> 127.0.0.1:80                 Route   1      0          0  

#ka1故障,自动切换至ka2
[root@ka1-centos8 ~]#killall keepalived
[root@centos6 ~]#curl 10.0.0.10
Sorry Server on ka2

#恢复都有后端 RS
[root@rs1 ~]#chmod 644 /var/www/html/index.html
[root@rs2 ~]#systemctl start httpd
[root@centos6 ~]#curl 10.0.0.10
<h1>rs1.magedu.org</h1>
[root@centos6 ~]#curl 10.0.0.10
<h1>rs2.magedu.org</h1>
[root@ka1-centos8 ~]#hostname -I
10.0.0.8 
[root@ka2-centos8 ~]#hostname -I
10.0.0.18 10.0.0.10 

#恢复ka1服务器,又抢占回原来的VIP
[root@ka1-centos8 ~]#systemctl start keepalived.service 
[root@ka1-centos8 ~]#hostname -I
10.0.0.8 10.0.0.10 
[root@ka2-centos8 ~]#hostname -I
10.0.0.18 
[root@centos6 ~]#curl 10.0.0.10
<h1>rs1.magedu.org</h1>
[root@centos6 ~]#curl 10.0.0.10
<h1>rs2.magedu.org</h1>

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实战案例: 实现IPVS的高可用性

实战案例: 实现双主的LVS-DR模式

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