ECS迁移后外网无法访问

昨天收到阿里的迁移通知我预约了今天早上8点结果迁移完毕之后服务器外网一直无法访问

通过阿里的管理终端进入服务器执行 ip a 发现服务器网卡没有分配IP

root@iZ28cqmea34Z:~# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
    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
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:16:3e:04:d2:cc brd ff:ff:ff:ff:ff:ff
3: ens4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:16:3e:04:36:65 brd ff:ff:ff:ff:ff:ff

提交工单他们让我重启网络服务结果报错了通过 journalctl -xe 查看错误信息关键信息如下

Jul 29 11:30:58 iZ28cqmea34Z ifup[570]: Cannot find device "eth0"
Jul 29 11:30:58 iZ28cqmea34Z ifup[570]: Failed to bring up eth0.
Jul 29 11:30:58 iZ28cqmea34Z ifup[570]: Cannot find device "eth1"
Jul 29 11:30:58 iZ28cqmea34Z ifup[570]: Failed to bring up eth1.
Jul 29 11:30:58 iZ28cqmea34Z irqbalance[511]:  * Starting SMP IRQ Balancer: irqbalance
Jul 29 11:30:58 iZ28cqmea34Z cron[559]: (CRON) INFO (Running @reboot jobs)
Jul 29 11:30:58 iZ28cqmea34Z nscd[497]:    ...done.
Jul 29 11:30:58 iZ28cqmea34Z systemd[1]: Started LSB: Starts the Name Service Cache Daemon.

通过对比发现应该是阿里云迁移之后虚拟机网卡的MAC变了导致网卡名称变了所以要修改网卡
我的操作系统是 Ubuntu 的配置文件在 /etc/network/interfaces
用 VI 修改网卡接口配置 vi /etc/network/interfaces
- 替换 eth0 为 ens3
- 替换 eth1 为 ens4
- 保存退出

最后重启网络 service networking restart 查看网络已经获得IP了

root@iZ28cqmea34Z:~# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
    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
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:16:3e:04:d2:cc brd ff:ff:ff:ff:ff:ff
    inet 10.30.166.130/22 brd 10.30.167.255 scope global ens3
    valid_lft forever preferred_lft forever
3: ens4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:16:3e:04:36:65 brd ff:ff:ff:ff:ff:ff
    inet xxx.xxx.xxx.xxx/22 brd 121.42.207.255 scope global ens4
    valid_lft forever preferred_lft forever

外网访问正常问题解决