Ubuntu 20.04 how to modify the IP address example

illustrate:

Today, when continuing the last office collaboration platform experiment, I found that the virtual machine had obtained an IP address through DHCP before, and the address obtained by DHCP changed after the virtual machine was turned on. Because the website has been configured with a fixed IP address access, it cannot access the webpage, so it is necessary to change the IP address to the IP address obtained last time to access it. I checked how to change the IP address in Ubuntu and found that "Starting from 17.10, Ubuntu has abandoned the configuration of fixed IP in /etc/network/interfaces. Even if it is configured, it will not take effect. Instead, it has been changed to netplan mode, and the configuration is written in /etc/netplan/01-netcfg.yaml or a yaml file with a similar name."
Without further ado, let's talk about how to modify the IP address with Netplan

0x00

Use the ifconfig command to view the network card

ifconfig

0x01 Modify the YAML configuration file

sudo vi /etc/netplan/00-installer-config.yaml

network:
 ethernets:
  ens33: #Name of the configured network card addresses: [192.168.31.215/24] #Static IP address and mask dhcp4: no #Turn off DHCP. If you need to turn on DHCP, write yes
   optional: true
   gateway4: 192.168.31.1 #Gateway address nameservers:
     addresses: [192.168.31.1,114.114.114.114] #DNS server address. Multiple DNS server addresses need to be separated by commas. version: 2
 renderer: networkd #Specify the backend to use systemd-networkd or Network Manager. If left blank, systemd-workd will be used by default.

After configuring according to your needs, save the file

0x02 Make the configured IP address effective

sudo netplan apply

OK, use the ifconfig command to check whether the configured new IP address is effective.

0x03 Notes:

1. The IP address and DNS server address need to be enclosed in [], but the gateway address does not need to be enclosed in [].
2. Note that a space must be added after each colon.
3. Pay attention to the indentation in front of each layer, at least two spaces more than the previous layer

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