作者：强毛 | 来源：互联网 | 2023-08-15 18:51
现在环境目前只有一台服务器2.现在迁移如下（lvs采用的是NAT的方式）3.IP说明：Nginx：192.168.0.106192.168.0.108Lvs：192.168.0
现在环境目前只有一台服务器
2.现在迁移如下（lvs 采用的是NAT的方式）
![技术分享]( "跨职能流程图（垂直）.png")
3.IP说明：
Nginx：192.168.0.106
192.168.0.108
Lvs： 192.168.0.109 公网Ip：124.205.3.181
192.168.0.110 公网Ip：124.205.3.179
Keepalived：
VIP：124.205.3.180 #解析地址
192.168.0.21 #内网上网
4. LVS NAT 的原理
![技术分享]( "1.png")
1)客户端请求数据，目标IP为VIP
2)请求数据到达LB服务器，LB根据调度算法将目的地址修改为RIP地址及对应端口（此RIP地址是根据调度算法得出的。）并在连接HASH表中记录下这个连接。
3)数据包从LB服务器到达RS服务器webserver，然后webserver进行响应。Webserver的网关必须是LB，然后将数据返回给LB服务器。
4)收到RS的返回后的数据，根据连接HASH表修改源地址VIP&目标地址CIP，及对应端口80.然后数据就从LB出发到达客户端。
5)客户端收到的就只能看到VIP\DIP信息。
5.keepalived 主配置文件 192.168.0.109
192.168.0.109 master
!Configuration File for keepalived
global_defs{
notification_email{
liuhx@xinfushe.com
}
notification_email_fromAlexandre.Cassen@firewall.loc
smtp_server 192.168.0.109
smtp_connect_timeout 30
router_id LVS_01
}
vrrp_instanceVI_1 {
state MASTER
interface eth1
virtual_router_id 199
priority 150
advert_int 1
authentication {
auth_type PASS
auth_pass 1098
}
virtual_ipaddress {
124.205.3.180/29 dev eth1 label eth1:2
}
}
vrrp_instanceVI_2 {
state MASTER
interface eth0
virtual_router_id 198
priority 150
advert_int 1
authentication {
auth_type PASS
auth_pass 1098
}
virtual_ipaddress {
192.168.0.21/22 dev eth0 label eth0:1
}
}
virtual_server124.205.3.180 80 {
delay_loop 6
lb_algo rr
lb_kind NAT
nat_mask 255.255.255.248
persistence_timeout 0
protocol TCP
real_server 192.168.0.106 80 {
weight 1
TCP_CHECK {
connect_timeout 8
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 192.168.0.108 80 {
weight 1
TCP_CHECK {
connect_timeout 8
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
virtual_server124.205.3.180 443 {
delay_loop 6
lb_algo rr
lb_kind NAT
nat_mask 255.255.255.248
persistence_timeout 0
protocol TCP
real_server 192.168.0.106 443 {
weight 1
TCP_CHECK {
connect_timeout 8
nb_get_retry 3
delay_before_retry 3
connect_port 443
}
}
real_server 192.168.0.108 443 {
weight 1
TCP_CHECK {
connect_timeout 8
nb_get_retry 3
delay_before_retry 3
connect_port 443
}
}
}6.keepalived 备用 192.168.0.110 配置文件
!Configuration File for keepalived
global_defs{
notification_email{
liuhx@xinfushe.com
}
notification_email_fromAlexandre.Cassen@firewall.loc
smtp_server 192.168.0.109
smtp_connect_timeout 30
router_id LVS_02
}
vrrp_instanceVI_1 {
state BACKUP
interface eth1
virtual_router_id 199
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1098
}
virtual_ipaddress {
124.205.3.180/29 dev eth1 label eth1:2
}
}
vrrp_instanceVI_2 {
state BACKUP
interface eth0
virtual_router_id 198
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1098
}
virtual_ipaddress {
192.168.0.21/22 dev eth0 label eth0:1
}
}
#ipvsadm-A -t 10.0.1.31:80 -s rr -p 300
virtual_server124.205.3.180 80 {
delay_loop 6
lb_algo rr
lb_kind NAT
nat_mask 255.255.255.248
persistence_timeout 50
protocol TCP
#ipvsadm-a -t 10.0.1.31:80 -r 10.0.1.6:80 -g
real_server 192.168.0.106 80 {
weight 1
TCP_CHECK {
connect_timeout 8
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 192.168.0.108 80 {
weight 1
TCP_CHECK {
connect_timeout 8
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
virtual_server124.205.3.180 443 {
delay_loop 6
lb_algo rr
lb_kind NAT
nat_mask 255.255.255.248
persistence_timeout 0
protocol TCP
real_server 192.168.0.106 443 {
weight 1
TCP_CHECK {
connect_timeout 8
nb_get_retry 3
delay_before_retry 3
connect_port 443
}
}
real_server 192.168.0.108 443 {
weight 1
TCP_CHECK {
connect_timeout 8
nb_get_retry 3
delay_before_retry 3
connect_port 443
}
}
}7.网卡地址信息
[root@nat11~]# ifconfig
eth0:flags=4163 mtu 1500
inet 192.168.0.109 netmask 255.255.252.0 broadcast 192.168.3.255
inet6 fe80::20c:29ff:fe0e:71a1 prefixlen 64 scopeid 0x20
ether 00:0c:29:0e:71:a1 txqueuelen 1000 (Ethernet)
RX packets 10285665 bytes 6037023442 (5.6 GiB)
RX errors 0 dropped 12270 overruns 0 frame 0
TX packets 6762099 bytes 2555517373 (2.3 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
eth0:1:flags=4163 mtu 1500
inet 192.168.0.21 netmask 255.255.252.0 broadcast 0.0.0.0
ether 00:0c:29:0e:71:a1 txqueuelen 1000 (Ethernet)
eth1:flags=4163 mtu 1500
inet 124.205.3.181 netmask 255.255.255.248 broadcast 124.205.3.183
inet6 fe80::20c:29ff:fe0e:71ab prefixlen 64 scopeid 0x20
ether 00:0c:29:0e:71:ab txqueuelen 1000 (Ethernet)
RX packets 5132918 bytes 2202414181 (2.0 GiB)
RX errors 0 dropped 2 overruns 0 frame 0
TX packets 5378351 bytes 5416028620 (5.0 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
eth1:2:flags=4163 mtu 1500
inet 124.205.3.180 netmask 255.255.255.248 broadcast 0.0.0.0
ether 00:0c:29:0e:71:ab txqueuelen 1000 (Ethernet)
lo:flags=73 mtu65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10
loop txqueuelen 0 (Local Loopback)
RX packets 98 bytes 8360 (8.1 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 98 bytes 8360 (8.1 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[root@nat11~]#
8.说明：
NAT上面可以看出 网关nginx得指向lvs服务器，lvs得开启转发的功能
keepalivedVRRP协议允许网段（两台lvs都得做）
iptables -A INPUT -p 112 -d 224.0.0.0/32 -j ACCEPT
lvs开启内核转发：（两台lvs都得做）
echo 1 /proc/sys/net/ipv4/ip_forward
备注：LVS 443 80 都得开启，因为是https
防火墙允许
网关得指向lvs
lvs开启内核转发
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