Example of how to modify ip address in Ubuntu20.04

**Description: **

Today, when I continued the last office collaboration platform experiment, I found that the virtual machine obtained the IP address through DHCP before, and this time the address obtained by DHCP changed after the virtual machine was turned on, because the website has been configured with a fixed IP address for access , The webpage cannot be accessed, so you need to modify the ip address to the ip address obtained last time. After checking how to modify the ip address in ubuntu, I found that "ubuntu has given up on fixing the IP in /etc/network/interfaces since 17.10 The configuration will not take effect even if the configuration is configured. Instead, it will be changed to netplan. The configuration is written in /etc/netplan/01-netcfg.yaml or a yaml file with a similar name."
Not much to say, just talk about how netplan changes the ip address

0 x00

Use the ifconfig command to view the network card

ifconfig

0 x01 modify yaml configuration file

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

network:
 ethernets:
 ens33:   #The name of the configured network card
 addresses:[192.168.31.215/24]  #Configured static IP address and mask
 dhcp4: no  #Turn off DHCP, write yes if you need to turn on DHCP
 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 English commas
 version:2
 renderer: networkd  #Specify systemd for backend-networkd or Network Manager, if you don’t fill in, systemd will be used by default-workd

Save the file after configuring it according to your needs

0 x02 makes the configured ip address effective

sudo netplan apply

Okay, use the ifconfig command to check whether the configured new ip address has taken effect.

**0 x03 Note: **

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

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