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LVS+DR+apache+keepalived负载均衡
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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
