LVS+DR+apache+keepalived负载均衡
1、首先准备两台服务器
| ip | 10.0.1.32 |
| ip | 10.0.1.33 |
| vip | 10.0.1.100 |
2、关闭防火墙
```shell
systemctl stop firewalld
systemctl disable firewalld
sed -i '/^SELINUX=/s/enforcing/disabled/' /etc/selinux/config
grep '^SELINUX=' /etc/selinux/config
setenforce off
reboot
```
3、安装keepalived,两台机器都需要安装
```shell
yum -y install keepalived
```
4、打开keepalived的配置文件，首先配置主的文件
```shell
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 ens33 #这个网卡名字一定要写自己的 我的是ens33
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 {
10.0.1.100 #vip地址
}
}
virtual_server 10.0.1.100 80 {
delay_loop 6
lb_algo rr
lb_kind DR
nat_mask 255.255.255.0
protocol TCP
real_server 10.0.1.32 80 {
weight 1
TCP_CHECK {
connect_timeout 3
connect_port 80
nb_get_retry 3
delay_before_retry 3
}
}
real_server 10.0.1.33 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
```shell
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 ens33 #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 {
10.0.1.100 #vip要和主的配置的一致
}
}
virtual_server 10.0.1.100 80 {
delay_loop 6
lb_algo rr
lb_kind DR
nat_mask 255.255.255.0
protocol TCP
real_server 10.0.1.33 80 {
weight 1
TCP_CHECK {
connect_timeout 3
connect_port 80
nb_get_retry 3
delay_before_retry 3
}
}
real_server 10.0.1.32 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
```shell
systemctl restart keepalived
```
7、查看主的vip是否存在
```shell
[root@node2 network-scripts]# ip a
1: lo:
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 10.0.1.100/32 brd 10.0.1.100 scope global lo:0
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens33:
link/ether 00:0c:29:0e:cc:e5 brd ff:ff:ff:ff:ff:ff
inet 10.0.1.32/24 brd 10.0.1.255 scope global noprefixroute ens33
valid_lft forever preferred_lft forever
inet 10.0.1.100/32 scope global ens33
valid_lft forever preferred_lft forever
inet6 fe80::67a:22ad:a7c5:73/64 scope link noprefixroute
valid_lft forever preferred_lft forever
```
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:
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 10.0.1.100/32 brd 10.0.1.100 scope global lo:0
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens33:
link/ether 00:0c:29:45:8a:35 brd ff:ff:ff:ff:ff:ff
inet 10.0.1.32/24 brd 10.0.1.255 scope global noprefixroute ens33
valid_lft forever preferred_lft forever
inet 10.0.1.100/32 scope global ens33
valid_lft forever preferred_lft forever
inet6 fe80::de48:34e2:d290:a46/64 scope link noprefixroute
valid_lft forever preferred_lft forever
3: virbr0:
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:
link/ether 52:54:00:65:fe:02 brd ff:ff:ff:ff:ff:ff
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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
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[root@localhost ~]# cd /etc/sysconfig/network-scripts/
[root@localhost network-scripts]# ls
ifcfg-ens33 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
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11、修改cp的接口
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[root@localhost network-scripts]# vim ifcfg-lo:0
[root@localhost network-scripts]# cat ifcfg-lo:0
DEVICE=lo:0
IPADDR=10.0.1.100
NETMASK=255.255.255.255
ONBOOT=yes
[root@localhost network-scripts]# ifup ifcfg-lo:0
ifconfig
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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 --save > /etc/sysconfig/ipvsadm
ipvsadm -A -t 10.0.1.100:80 -s rr
ipvsadm -a -t 10.0.1.100:80 -r 10.0.1.33:80 -g
ipvsadm -a -t 10.0.1.100:80 -r 10.0.1.32:80 -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 10.0.1.100 dev lo:0
systemctl restart ipvsadm
systemctl status ipvsadm
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15、两台服务器执行ipvsadm查看是否成功
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[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 10.0.1.100:80 rr
-> 10.0.1.33:80 Route 1 0 0
-> 10.0.1.32:80 Route 1 0 7
[root@localhost ~]#
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16、两台服务器查看vip是否存在
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[root@localhost ~]# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 10.0.1.2 0.0.0.0 UG 100 0 0 ens33
10.0.1.0 0.0.0.0 255.255.255.0 U 100 0 0 ens33
10.0.1.100 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 ~]#
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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 ~]#
[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
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#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