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 { [email protected] [email protected] [email protected] } notification_email_from [email protected] smtp_server 192.168.200.1 smtp_connect_timeout 30 router_id LVS_DEVEL vrrp_skip_check_adv_addr vrrp_garp_interval 0 vrrp_gna_interval 0 } 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 51 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 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.52.100 #vip地址 } } virtual_server 192.168.52.100 80 { delay_loop 6 lb_algo rr lb_kind DR nat_mask 255.255.255.0 protocol TCP real_server 192.168.52.33 80 { weight 1 TCP_CHECK { connect_timeout 3 connect_port 80 nb_get_retry 3 delay_before_retry 3 } } real_server 192.168.52.34 80 { weight 1 TCP_CHECK { connect_timeout 3 connect_port 80 nb_get_retry 3 delay_before_retry 3 } } }
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 { [email protected] [email protected] [email protected] } notification_email_from [email protected] smtp_server 192.168.200.1 smtp_connect_timeout 30 router_id LVS_DEVEL vrrp_skip_check_adv_addr vrrp_garp_interval 0 vrrp_gna_interval 0 } 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 51 priority 90 #从的优先级一定要比主的优先级要低 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.52.100 #vip要和主的配置的一致 } } virtual_server 192.168.52.100 80 { delay_loop 6 lb_algo rr lb_kind DR nat_mask 255.255.255.0 protocol TCP real_server 192.168.52.33 80 { weight 1 TCP_CHECK { connect_timeout 3 connect_port 80 nb_get_retry 3 delay_before_retry 3 } } real_server 192.168.52.34 80 { weight 1 TCP_CHECK { connect_timeout 3 connect_port 80 nb_get_retry 3 delay_before_retry 3 } } } 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 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 192.168.52.100/32 brd 192.168.52.100 scope global lo:0 valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: ens32: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 link/ether 00:0c:29:8e:57:0c brd ff:ff:ff:ff:ff:ff inet 192.168.52.33/24 brd 192.168.52.255 scope global noprefixroute ens32 valid_lft forever preferred_lft forever inet 192.168.52.100/32 scope global ens32 valid_lft forever preferred_lft forever inet6 fe80::9dd1:a054:cfbe:5143/64 scope link noprefixroute valid_lft forever preferred_lft forever 3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000 link/ether 52:54:00:19:ed:59 brd ff:ff:ff:ff:ff:ff inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0 valid_lft forever preferred_lft forever 4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN group default qlen 1000 link/ether 52:54:00:19:ed:59 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 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 192.168.52.100/32 brd 192.168.52.100 scope global lo:0 valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: ens32: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 link/ether 00:0c:29:45:8a:35 brd ff:ff:ff:ff:ff:ff inet 192.168.52.34/24 brd 192.168.52.255 scope global noprefixroute ens32 valid_lft forever preferred_lft forever inet 192.168.52.100/32 scope global ens32 valid_lft forever preferred_lft forever inet6 fe80::de48:34e2:d290:a46/64 scope link noprefixroute valid_lft forever preferred_lft forever 3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000 link/ether 52:54:00:65:fe:02 brd ff:ff:ff:ff:ff:ff inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0 valid_lft forever preferred_lft forever 4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN group default qlen 1000 link/ether 52:54:00:65:fe:02 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:0 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:0
11、修改cp的接口
[root@localhost network-scripts]# vim ifcfg-lo:0 [root@localhost network-scripts]# cat ifcfg-lo:0 DEVICE=lo:0 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 192.168.52.100:80 -s rr ipvsadm -a -t 192.168.52.100:80 -r 192.168.52.33:80 -g ipvsadm -a -t 192.168.52.100:80 -r 192.168.52.34:80 -g 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 route add -host 192.168.52.100 dev lo:0
15、两台服务器执行ipvsadm查看是否成功
[root@localhost ~]# ipvsadm -Ln IP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler Flags -> RemoteAddress:Port Forward Weight ActiveConn InActConn TCP 192.168.52.100:80 rr -> 192.168.52.33:80 Route 1 0 0 -> 192.168.52.34:80 Route 1 0 7 [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 100 0 0 ens32 192.168.52.0 0.0.0.0 255.255.255.0 U 100 0 0 ens32 192.168.52.100 0.0.0.0 255.255.255.255 UH 0 0 0 lo 192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 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 1111 [root@localhost ~]#
第二台服务器
[root@localhost ~]# vim /var/www/html/index.html [root@localhost ~]# cat /var/www/html/index.html 2222 [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