阿里云服务器怎么实现绑定多IP地址？
经常有客户咨询阿里云服务器怎么实现绑定多IP地址？ 阿里云服务器多个弹性公网IP是否可以绑定到一台实例上？本文通过实操的方式为大家介绍，步骤相对较多阿里云控制台步骤有所简化，如果有什么不理解可以联系我们。
配置前须知
1、参考实例规格族绑定弹性网卡和内网IP的个数限制： https://help.aliyun.com/document_detail/25378.html
阿里云服务器支持绑定的IP数(固定Ip和弹性公网IP之和)：(弹性网卡-1)*单网卡私有IP+1
以hfc7实例规格“2核4G”为例可绑定的IP数为：(2-1)*6+1=7个；
注意：云服务器封顶绑定IP数21个，因为弹性公网IP一个地域仅支持申请20个。
2、配置弹性网卡： https://help.aliyun.com/document_detail/56955.html
3、分配辅助私网IP地址： https://help.aliyun.com/document_detail/101180.htm
5、建议您服务器创建快照备份。操作流程请参见 创建快照
配置流程
一、阿里云控制台配置
1、购买阿里云ECS服务器
CPU&内存：1核1 GiB
操作系统：CentOS 7.8 64位
实例规格：ecs.s6-c1m1.small
实例规格族：ecs.s6
2、创建弹性网卡绑定阿里云服务器
3、创建两个弹性公网ip绑定到，分别绑定到辅助网卡的主私网IP和辅助私网IP上。
下图已经绑定完成
二、Cenots 7服务器内部配置流程
1、查看网卡信息并没有加载eth0
[root@iZ7u1o01onqjo4Z ~]# 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
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0:
link/ether 00:16:3e:02:3b:0b brd ff:ff:ff:ff:ff:ff
inet 172.19.6.126/24 brd 172.19.6.255 scope global dynamic eth0
valid_lft 315359681sec preferred_lft 315359681sec
inet6 fe80::216:3eff:fe02:3b0b/64 scope link
valid_lft forever preferred_lft forever
3: eth1:
link/ether 00:16:3e:26:67:2e brd ff:ff:ff:ff:ff:ff
2、参考： https://help.aliyun.com/document_detail/56955.html 配置弹性网卡
[root@iZ7u1o01onqjo4Z ~]# wget https://image-offline.oss-cn-hangzhou.aliyuncs.com/multi-nic-util/multi-nic-util-0.6.tgz
--2021-06-16 20:30:44-- https://image-offline.oss-cn-hangzhou.aliyuncs.com/multi-nic-util/multi-nic-util-0.6.tgz
正在解析主机 image-offline.oss-cn-hangzhou.aliyuncs.com (image-offline.oss-cn-hangzhou.aliyuncs.com)... 118.31.232.173
正在连接 image-offline.oss-cn-hangzhou.aliyuncs.com (image-offline.oss-cn-hangzhou.aliyuncs.com)|118.31.232.173|:443... 已连接。
已发出 HTTP 请求，正在等待回应... 200 OK
长度：9149 (8.9K) [application/x-gzip]
正在保存至: “multi-nic-util-0.6.tgz”
100%[======================================>] 9,149 --.-K/s 用时 0s
2021-06-16 20:30:44 (52.0 MB/s) - 已保存 “multi-nic-util-0.6.tgz” [9149/9149])
[root@iZ7u1o01onqjo4Z ~]# tar -zxvf multi-nic-util-0.6.tgz
multi-nic-util-0.6/
multi-nic-util-0.6/install.sh
multi-nic-util-0.6/src/
multi-nic-util-0.6/src/dhcp/
multi-nic-util-0.6/src/dhcp/dhclient-exit-hooks
multi-nic-util-0.6/src/dhcp/dhclient-exit-hooks-for-debug
multi-nic-util-0.6/src/dhcp/dhclient-down-hooks
multi-nic-util-0.6/src/udev/
multi-nic-util-0.6/src/udev/rule_generator.functions
multi-nic-util-0.6/src/udev/write_net_rules
multi-nic-util-0.6/src/udev-rules/
multi-nic-util-0.6/src/udev-rules/61-eni.rules
multi-nic-util-0.6/src/udev-rules/75-persistent-net-generator.rules
multi-nic-util-0.6/src/udev-rules/60-net.rules
multi-nic-util-0.6/src/eni-utils/
multi-nic-util-0.6/src/eni-utils/eni-hotplug
multi-nic-util-0.6/src/eni-utils/eni-function
multi-nic-util-0.6/src/eni-utils/net.hotplug
multi-nic-util-0.6/src/eni-utils/eni-cleanup
multi-nic-util-0.6/src/eni-utils/eni-ifscan
multi-nic-util-0.6/src/eni-utils/eni-version
multi-nic-util-0.6/src/eni-utils/eni-helper
multi-nic-util-0.6/src/boot/
multi-nic-util-0.6/src/boot/eni.service
multi-nic-util-0.6/src/boot/systemd-udevd.service
multi-nic-util-0.6/src/boot/eni-service
multi-nic-util-0.6/src/lib/
multi-nic-util-0.6/src/lib/distro.sh
[root@iZ7u1o01onqjo4Z ~]# cd multi-nic-util-0.6
[root@iZ7u1o01onqjo4Z multi-nic-util-0.6]# bash install.sh
the file /lib/udev/write_net_rules NOT exist...
the file /lib/udev/rule_generator.functions NOT exist...
delete the file: /etc/udev/rules.d/70-persistent-net.rules
replace the file: /lib/udev/rules.d/60-net.rules
Created symlink from /etc/systemd/system/multi-user.target.wants/eni.service to /usr/lib/systemd/system/eni.service.
ecs_mq.service enabled
3、重启网卡
[root@iZ7u1o01onqjo4Z multi-nic-util-0.6]# systemctl restart eni.service
4、测试绑定到弹性网卡主ip的弹性公网IP已经可以正常访问，说明配置没问题。
[root@iZ7u1o01onqjo4Z multi-nic-util-0.6]# 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
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0:
link/ether 00:16:3e:02:3b:0b brd ff:ff:ff:ff:ff:ff
inet 172.19.6.126/24 brd 172.19.6.255 scope global dynamic eth0
valid_lft 315359623sec preferred_lft 315359623sec
inet6 fe80::216:3eff:fe02:3b0b/64 scope link
valid_lft forever preferred_lft forever
3: eth1:
link/ether 00:16:3e:26:67:2e brd ff:ff:ff:ff:ff:ff
inet6 fe80::216:3eff:fe26:672e/64 scope link tentative
valid_lft forever preferred_lft forever
5、参考分配辅助私网IP地址，配置单网卡多个内网IP
[root@iZ7u1o01onqjo4Z multi-nic-util-0.6]# cat /etc/sysconfig/network-scripts/ifcfg-eth1
DEVICE=eth1
BOOTPROTO=dhcp
ONBOOT=yes
TYPE=Ethernet
USERCTL=yes
PEERDNS=no
IPV6INIT=no
PERSISTENT_DHCLIENT=yes
HWADDR=00:16:3e:26:67:2e
DEFROUTE=no
[root@iZ7u1o01onqjo4Z multi-nic-util-0.6]#
[root@iZ7u1o01onqjo4Z multi-nic-util-0.6]# vi /etc/sysconfig/network-scripts/ifcfg-eth1
[root@iZ7u1o01onqjo4Z multi-nic-util-0.6]#
[root@iZ7u1o01onqjo4Z multi-nic-util-0.6]# cat /etc/sysconfig/network-scripts/ifcfg-eth1
DEVICE=eth1
BOOTPROTO=no
ONBOOT=yes
TYPE=Ethernet
USERCTL=yes
PEERDNS=no
IPV6INIT=no
PERSISTENT_DHCLIENT=yes
HWADDR=00:16:3e:26:67:2e
IPADDR0=172.19.6.127
IPADDR1=172.19.6.129
DEFROUTE=no
[root@iZ7u1o01onqjo4Z multi-nic-util-0.6]#
[root@iZ7u1o01onqjo4Z multi-nic-util-0.6]# service network restart
Restarting network (via systemctl): [ OK ]
[root@iZ7u1o01onqjo4Z multi-nic-util-0.6]#
[root@iZ7u1o01onqjo4Z multi-nic-util-0.6]#
[root@iZ7u1o01onqjo4Z multi-nic-util-0.6]# 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
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0:
link/ether 00:16:3e:02:3b:0b brd ff:ff:ff:ff:ff:ff
inet 172.19.6.126/24 brd 172.19.6.255 scope global dynamic eth0
valid_lft 315359953sec preferred_lft 315359953sec
inet6 fe80::216:3eff:fe02:3b0b/64 scope link
valid_lft forever preferred_lft forever
3: eth1:
link/ether 00:16:3e:26:67:2e brd ff:ff:ff:ff:ff:ff
inet 172.19.6.127/16 brd 172.19.255.255 scope global eth1
valid_lft forever preferred_lft forever
inet 172.19.6.129/16 brd 172.19.255.255 scope global secondary eth1
valid_lft forever preferred_lft forever
inet6 fe80::216:3eff:fe26:672e/64 scope link
valid_lft forever preferred_lft forever
三、测试结果
分别访问三个公网IP地址，均可以正常访问了，说明配置没问题。
