安装ubuntu系统1804(注意有live和不带live的版本,本次用不带live的版本)
注意开始默认为NAT模式

ubuntu默认以普通用户身份登陆,切换到root
ubuntu切换到root用户,使用su root命令去切换到root权限,此时会提示输入密码
,可是怎么也输不对,提示“Authentication failure”
此时有两种情况一个是密码真的错了,另一种就是刚安装好的Linux系统,没有给root设置密码
解决办法:给root 用户设置密码,输入命令: sudo passwd root,输入密码,并确认密码
重新输入命令:su root,然后输入密码,便可切换到root权限了
返回普通用户exit,或者使用命令su username

修改配置文件默认登陆为root账户登陆
修改配置文件vim /etc/ssh/sshd_config
#PermitRootLogin prohibit-password #找到此项修改如下
PermitRootLogin yes
#UseDNS no #找到此项去掉注释,修改如下
UseDNS no

修改主机名
hostnamectl set-hostname ubuntu1804

Ubantu网络配置
网卡名称:
默认ubantu的网卡名称和Centos7类似,如:ens33,ens38等
修改网卡名称为传统命名方式:(最好在装系统时就改好,在安装界面输入net.ifnames=0 biosdevname=0)
修改配置文件为下面形式
vi /etc/default/grub
GRUB_CMDLINE_LINUX="net.ifnames=0 biosdevname=0"
生效新的grub.cfg文件
grub-mkconfig -o /boot/grub/grub.cfg #Centos里面是grub2
重启reboot

官方文档
https://help.ubuntu.com/lts/serverguide/network-configuration.html.zh-CN
配置自动获取IP(注意缩进格式)
cat /etc/netplan/01-netcfg.yaml
network
version: 2
renderer: networkd
ethernets:
ens33:
dhcp4: yes

修改网卡配置文件后需执行命令生效:netplan apply
配置静态IP:
cat /etc/netplan/01-netcfg.yaml
network:
version: 2
renderer: networkd
ethernets:
eth0:
addresses:

  • 192.168.56.64/24
  • 10.20.156.23/24
    gateway4: 192.168.56.1
    nameservers:
    search: [mydomain,otherdomain]
    addresses: [114.114.114.114]

查看IP和gateway
ip addr
route -n

查看DNS
ls -l /etc/resolv.conf
systemd-resolve --status

同步时间
sudo apt-get update??

Ubuntu最小化没有selinux,不用关闭
没有防火墙,验证一下
systemctl disable firewalld
systemctl disable iptables
清空防火墙规则iptables -F
iptable -vnL查看

更改为阿里云的yum源
vim /etc/apt/sources.list
deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse

sudo apt-get update更新apt源

[c:\~]$ Connecting to 192.168.247.64:22...
Connection established.
To escape to local shell, press 'Ctrl+Alt+]'.

Welcome to Ubuntu 18.04.1 LTS (GNU/Linux 4.15.0-29-generic x86_64)

234 packages can be updated.
117 updates are security updates.

通过Xshell远程链接后如下
The programs included with the Ubuntu system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by
applicable law.

/usr/bin/xauth: file /root/.Xauthority does not exist
root@ubuntu-torrent:~#