Ubuntu/Debian NetworkManager與/network/interfaces設定

Ubuntu/Debian desktop版的系統已預先安裝NetworkManager，而server版則沒有。

使用桌面版可能會遇到一種現象， 想使用NetworkManager管理網卡，卻出現"device not managed"訊息，再怎麼設定也不會運作。這是因為/network/interfaces已經管理這張網卡，造成NetworkManager無法再管理這張網卡。


任選一種解決方式：

方法1. 修改network/interfaces設定，刪除eth0網卡的設定。記得要保留lo網卡(localhost)的設定。重新啟動系統後，可以用NetworkManager管理網卡了！
/etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

方法2. 修改NetworkManager的設定檔，路徑/etc/NetworkManager/NetworkManager.conf，將managed設為true，表示由NetworkManager管理所有網路卡的設定，預設情況會看見ifupdown (eth0)設定，這是NetworkManager管理network/interfaces內eth0的結果。
/etc/NetworkManager/NetworkManager.conf
[main]
plugins=ifupdown,keyfile

[ifupdown]
managed=true

reference
http://blog.roodo.com/rocksaying/archives/11777065.html





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