LVS+DR+apache+keepalived负载均衡

1、首先准备两台服务器、三台也可以我这里是两台

IP:192.168.52.33

IP:192.168.52.34

VIP:192.168.52.100

2、关闭防火墙

systemctl stop firewalld

setenforce 0

3、安装keepalived,两台机器都需要安装

yum -y install keepalived

4、打开keepalived的配置文件，首先配置主的文件

vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {

   notification_email {

     acassen@firewall.loc

     failover@firewall.loc

     sysadmin@firewall.loc

   }

   notification_email_from Alexandre.Cassen@firewall.loc

   smtp_server 192.168.200.1

   smtp_connect_timeout

   router_id LVS_DEVEL

   vrrp_skip_check_adv_addr

   vrrp_garp_interval

   vrrp_gna_interval

}

vrrp_instance VI_1 {

    state MASTER   #这里要改成主的

    interface ens32   #这个网卡名字一定要写自己的  我的是ens32

    virtual_router_id

    priority 100   #这个是优先级主的优先级一定要比从的优先级高

    advert_int

    authentication {

        auth_type PASS

        auth_pass

    }

    virtual_ipaddress {

        192.168.52.100   #vip地址

    }

}

virtual_server 192.168.52.100  {

    delay_loop

    lb_algo rr

    lb_kind DR

    nat_mask 255.255.255.0

    protocol TCP

    real_server 192.168.52.33  {

        weight

        TCP_CHECK {

            connect_timeout

            connect_port

            nb_get_retry

            delay_before_retry

        }

   }

    real_server 192.168.52.34  {

        weight

        TCP_CHECK {

            connect_timeout

            connect_port

            nb_get_retry

            delay_before_retry

        }

   }

}

vrrp_strict #centos7里的keepalived有一个广播这个需要删除切记

5、配置从的文件，比主的文件有一点差别

vim /etc/keepalived/keealived.con

! Configuration File for keepalived

global_defs {

   notification_email {

     acassen@firewall.loc

     failover@firewall.loc

     sysadmin@firewall.loc

   }

   notification_email_from Alexandre.Cassen@firewall.loc

   smtp_server 192.168.200.1

   smtp_connect_timeout

   router_id LVS_DEVEL

   vrrp_skip_check_adv_addr

   vrrp_garp_interval

   vrrp_gna_interval

}

vrrp_instance VI_1 {

    state BACKUP    #这个要写从

    interface ens32   #网卡名字要写成自己的

    virtual_router_id

    priority 90     #从的优先级一定要比主的优先级要低

    advert_int

    authentication {

        auth_type PASS

        auth_pass

    }

    virtual_ipaddress {

        192.168.52.100   #vip要和主的配置的一致

    }

}

virtual_server 192.168.52.100  {

    delay_loop

    lb_algo rr

    lb_kind DR

    nat_mask 255.255.255.0

    protocol TCP

    real_server 192.168.52.33  {

        weight

        TCP_CHECK {

            connect_timeout

            connect_port

            nb_get_retry

            delay_before_retry

        }

   }

    real_server 192.168.52.34  {

        weight

        TCP_CHECK {

            connect_timeout

            connect_port

            nb_get_retry

            delay_before_retry

        }

   }

}

vrrp_strict   #centos7里的keepalived有一个广播  这个需要删除  切记

6、重启keepalived，两个机子都需要重启

systemctl restart keepalived

7、查看主的vip是否存在

[root@localhost ~]# ip a

: lo: <LOOPBACK,UP,LOWER_UP> mtu  qdisc noqueue state UNKNOWN group default qlen

    link/loopback ::::: brd :::::

    inet 127.0.0.1/ scope host lo

       valid_lft forever preferred_lft forever

    inet 192.168.52.100/ brd 192.168.52.100 scope global lo:

       valid_lft forever preferred_lft forever

    inet6 ::/ scope host

       valid_lft forever preferred_lft forever

: ens32: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu  qdisc pfifo_fast state UP group default qlen

    link/ether :0c::8e::0c brd ff:ff:ff:ff:ff:ff

    inet 192.168.52.33/ brd 192.168.52.255 scope global noprefixroute ens32

       valid_lft forever preferred_lft forever

    inet 192.168.52.100/ scope global ens32

       valid_lft forever preferred_lft forever

    inet6 fe80::9dd1:a054:cfbe:/ scope link noprefixroute

       valid_lft forever preferred_lft forever

: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu  qdisc noqueue state DOWN group default qlen

    link/ether ::::ed: brd ff:ff:ff:ff:ff:ff

    inet 192.168.122.1/ brd 192.168.122.255 scope global virbr0

       valid_lft forever preferred_lft forever

: virbr0-nic: <BROADCAST,MULTICAST> mtu  qdisc pfifo_fast master virbr0 state DOWN group default qlen

    link/ether ::::ed: brd ff:ff:ff:ff:ff:ff

8、关闭主的keepalived，查看vip是否漂移到从上

主：systemctl stop keepalived

从：

[root@localhost html]# ip a

: lo: <LOOPBACK,UP,LOWER_UP> mtu  qdisc noqueue state UNKNOWN group default qlen

    link/loopback ::::: brd :::::

    inet 127.0.0.1/ scope host lo

       valid_lft forever preferred_lft forever

    inet 192.168.52.100/ brd 192.168.52.100 scope global lo:

       valid_lft forever preferred_lft forever

    inet6 ::/ scope host

       valid_lft forever preferred_lft forever

: ens32: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu  qdisc pfifo_fast state UP group default qlen

    link/ether :0c:::8a: brd ff:ff:ff:ff:ff:ff

    inet 192.168.52.34/ brd 192.168.52.255 scope global noprefixroute ens32

       valid_lft forever preferred_lft forever

    inet 192.168.52.100/ scope global ens32

       valid_lft forever preferred_lft forever

    inet6 fe80::de48:34e2:d290:a46/ scope link noprefixroute

       valid_lft forever preferred_lft forever

: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu  qdisc noqueue state DOWN group default qlen

    link/ether ::::fe: brd ff:ff:ff:ff:ff:ff

    inet 192.168.122.1/ brd 192.168.122.255 scope global virbr0

       valid_lft forever preferred_lft forever

: virbr0-nic: <BROADCAST,MULTICAST> mtu  qdisc pfifo_fast master virbr0 state DOWN group default qlen

    link/ether ::::fe: brd ff:ff:ff:ff:ff:ff

如果成功，代表keepalived配置成功

主：开启keepalived

systemctl restart keepalived

9、安装ipvsadm，两个服务器都需要安装、

yum -y install ipvsadm

10、增加服务器的接口

[root@localhost ~]# cd /etc/sysconfig/network-scripts/

[root@localhost network-scripts]# ls

ifcfg-ens32  ifdown-eth   ifdown-post    ifdown-TeamPort  ifup-eth   ifup-plip    ifup-sit       init.ipv6-global

ifcfg-lo     ifdown-ib    ifdown-ppp     ifdown-tunnel    ifup-ib    ifup-plusb   ifup-Team      network-functions

ifcfg-lo:   ifdown-ippp  ifdown-routes  ifup             ifup-ippp  ifup-post    ifup-TeamPort  network-functions-ipv6

ifdown       ifdown-ipv6  ifdown-sit     ifup-aliases     ifup-ipv6  ifup-ppp     ifup-tunnel

ifdown-bnep  ifdown-isdn  ifdown-Team    ifup-bnep        ifup-isdn  ifup-routes  ifup-wireless

[root@localhost network-scripts]# cp ifcfg-lo ifcfg-lo:

11、修改cp的接口

[root@localhost network-scripts]# vim ifcfg-lo:

[root@localhost network-scripts]# cat ifcfg-lo:

DEVICE=lo:

IPADDR=192.168.52.100

NETMASK=255.255.255.255

ONBOOT=yes

[root@localhost network-scripts]#

12、另一台服务器做同样的操作

13、查看ifconfig看两台服务器的vip添加上没有

14、两台服务器执行操作

ipvsadm -A -t 192.168.52.100: -s rr

ipvsadm -a -t 192.168.52.100: -r 192.168.52.33: -g

ipvsadm -a -t 192.168.52.100: -r 192.168.52.34: -g

echo "" >/proc/sys/net/ipv4/conf/lo/arp_ignore

echo "" >/proc/sys/net/ipv4/conf/lo/arp_announce

echo "" >/proc/sys/net/ipv4/conf/all/arp_ignore

echo "" >/proc/sys/net/ipv4/conf/all/arp_announce

route add -host 192.168.52.100 dev lo:

15、两台服务器执行ipvsadm查看是否成功

[root@localhost ~]# ipvsadm -Ln

IP Virtual Server version 1.2. (size=)

Prot LocalAddress:Port Scheduler Flags

  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn

TCP  192.168.52.100: rr

  -> 192.168.52.33:             Route

  -> 192.168.52.34:             Route

[root@localhost ~]#

16、两台服务器查看vip是否存在

[root@localhost ~]# route -n

Kernel IP routing table

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface

0.0.0.0         192.168.52.2    0.0.0.0         UG                 ens32

192.168.52.0    0.0.0.0         255.255.255.0   U                  ens32

192.168.52.100  0.0.0.0         255.255.255.255 UH                   lo

192.168.122.0   0.0.0.0         255.255.255.0   U                    virbr0

[root@localhost ~]#

17、两台服务器源码安装Apache

yum -y install httpd

18、编写测试页面

第一台服务器

[root@localhost ~]# vim /var/www/html/index.html

[root@localhost ~]# cat /var/www/html/index.html 

[root@localhost ~]#

第二台服务器

[root@localhost ~]# vim /var/www/html/index.html

[root@localhost ~]# cat /var/www/html/index.html 

[root@localhost ~]#

19、两台服务器更改Apache配置文件

vim /etc/httpd/conf/httpd.conf


#http的持久链接主要依靠keepalive

KeepAlive OFF     #关闭KeeoAlive长链接

KeepAliveTimeout 15    #长连接多久算是超时，超时之后自动断开长连接

MaxKeepAliveRequests 100   #长连接最多接受多少个请求，请求数量大于改值则自动断开
开启Apache
systemctl restart httpd
访问vip就可以看到负载均衡的效果了

巴特西

LVS+DR+apache+keepalived负载均衡

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