ubuntu如何修改IP地址、和apt源

新安裝的ubuntu沒有vim，使用vi修改本身的IP地址

root@doupai-KVM:~# cat /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback

auto ens3
iface ens3 inet static
address 192.168.200.7
netmask 255.255.255.0
gateway 192.168.200.1
dns-nameserver 192.168.200.200

ubuntu18.04.2修改IP地址的方法有所變更，Ubuntu 18.04 採用netplan做爲網絡配置管理，與16.04及以前的版本區別很大。

root@doupai:~# cat /etc/netplan/50-cloud-init.yaml 
network:
    ethernets:
        ens3:
            addresses:
            - 192.168.200.136/24
            gateway4: 192.168.200.1
            nameservers:
                addresses:
                - 192.168.200.200
    version: 2

修改完以後，重啓網絡便可。

root@doupai:~# /etc/init.d/networking restart
[ ok ] Restarting networking (via systemctl): networking.service.

ubuntu系統如何修改apt源，使用aliyun源爲例：

將舊版本內容作好備份。

root@doupai-KVM:~# cp /etc/apt/sources.list /etc/apt/sources.list_bak

添加如下內容

root@doupai-KVM:~# cat /etc/apt/sources.list
deb-src http://archive.ubuntu.com/ubuntu xenial main restricted #Added by software-properties
deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted
deb-src http://mirrors.aliyun.com/ubuntu/ xenial main restricted multiverse universe #Added by software-properties
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted multiverse universe #Added by software-properties
deb http://mirrors.aliyun.com/ubuntu/ xenial universe
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates universe
deb http://mirrors.aliyun.com/ubuntu/ xenial multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse #Added by software-properties
deb http://archive.canonical.com/ubuntu xenial partner
deb-src http://archive.canonical.com/ubuntu xenial partner
deb http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted multiverse universe #Added by software-properties
deb http://mirrors.aliyun.com/ubuntu/ xenial-security universe
deb http://mirrors.aliyun.com/ubuntu/ xenial-security multiverse

更新本身的源，便可

root@doupai-KVM:~# apt update
root@doupai-KVM:~# apt-get update

接下來驗證源是否正常使用：

root@doupai-KVM:~# apt install -y openssh-server vim net-tools lrzsz