lshw -class network
临时设置IP地址：
sudo ip addr add 10.102.66.200/24 dev ens160
ip link set dev ens160 up
ip link set dev ens160 down
ip address show dev ens160
sudo ip route add default via 10.102.66.1
ip route show
ip addr flush ens160
设置静态IP地址：
vi /etc/netplan/01-netcfg.yaml

network:
  version: 2
  renderer: networkd
  ethernets:
    ens160:
      addresses: [ 172.16.8.18/24 ]
      gateway4: 172.16.8.1
      nameservers:
          search: [ afd.ink ]
          addresses:
              - "172.16.8.10"

Ubuntu 20.04 LTS Ubuntu Server Guide_系统/运维

使配置生效：

sudo netplan apply
 
配置动态的IP（DHCP）：
vi /etc/netplan/01-netcfg.yaml
network:
  version: 2
  renderer: networkd
  ethernets:
    ens160:
      
 
sudo netplan apply
 
Name Service Switch Configuration: /etc/nsswitch.conf

 

配置DHCP服务：

sudo apt install isc-dhcp-server
vi /etc/dhcp/dhcpd.conf
 
# minimal sample /etc/dhcp/dhcpd.conf
default-lease-time 600;
max-lease-time 7200;

subnet 172.16.8.0 netmask 255.255.255.0 {
 range 172.16.8.150 172.16.8.200;
 option routers 172.16.8.1;
 option domain-name-servers 172.16.8.10, 172.16.8.20;
 option domain-name "afd.ink";
}

 

sudo systemctl restart isc-dhcp-server.service
 
时间同步(NTP):
timedatectl status
systemctl status systemd-timesyncd
用户管理：
sudo adduser username
sudo deluser username
sudo chown -R root:root /home/username/
sudo mkdir /home/archived_users/
sudo mv /home/username /home/archived_users/
sudo passwd -l username
sudo passwd -u username

 

sudo addgroup groupname
sudo delgroup groupname
sudo adduser username groupname
 

User Profile: /etc/skel

 

ls -ld /home/username
sudo chmod 0750 /home/username
 
/etc/adduser.conf