問題描述

因為做Docker網路實驗，需要將原先Ubuntu虛機的一塊“橋接”網絡卡改為“HostOnly”網絡卡，並且新增另一塊“NAT”網絡卡。幾經周折發現只有第一塊網絡卡可以正確配置，ifconfig里根本看不到有第二塊網絡卡。

查詢問題

於是上網找了找，找到了一個CentOS虛機的，不太適用，但思路大概有了，就繼續往下搜，找到了Ubuntu的一篇文章。試了試，發現有點門路。

但我的網路裝置不是“eth0”，而是“enp0s3”，於是find了一下可能的目錄，果然找到了第二塊網絡卡的名字。

解決步驟

我的解決步驟：

• 確定網路裝置名稱

schen@scvmu01:/sys/class/net
 
$ ls
docker0 enp0s3 enp0s8 lo

• 配置自動啟動

[email protected]:~$ sudo vi /etc/network/interfaces
[sudo] password for schen: 
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
 

auto lo
iface lo inet loopback

# The primary network interface
auto enp0s3
iface enp0s3 inet dhcp

# The user added network interface
auto enp0s8
iface enp0s8 inet dhcp
~
~

（照貓畫虎新增最後三行內容）

• 啟動網路裝置

[email protected]:~$ sudo ifup enp0s8
Internet Systems Consortium DHCP Client 4.3.3
Copyright 2004-2015
 
 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/enp0s8/08:00:27:13:1e:58
Sending on   LPF/enp0s8/08:00:27:13:1e:58
Sending on   Socket/fallback
DHCPDISCOVER on enp0s8 to 255.255.255.255 port 67 interval 3 (xid=0xee28051e)
DHCPREQUEST of 192.168.56.103 on enp0s8 to 255.255.255.255 port 67 (xid=0x1e0528ee)
DHCPOFFER of 192.168.56.103 from 192.168.56.100
DHCPACK of 192.168.56.103 from 192.168.56.100
bound to 192.168.56.103 -- renewal in 514 seconds.
[email protected]:~$ 

• 檢視網路裝置

schen@scvmu01:~$ ifconfig enp0s8
enp0s8    Link encap:Ethernet  HWaddr 08:00:27:13:1e:58  
          inet addr:192.168.56.103  Bcast:192.168.56.255  Mask:255.255.255.0
          inet6 addr: fe80::a00:27ff:fe13:1e58/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:18 errors:0 dropped:0 overruns:0 frame:0
          TX packets:58 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:3073 (3.0 KB)  TX bytes:8585 (8.5 KB)

schen@scvmu01:~$ 

• 重啟虛機

schen@scvmu01:~$ sudo reboot

參考文章

鳴謝以上文章作者！