Ubuntu 22.04 静态 IP 配置

This guide explains how to configure a static IP address on Ubuntu 22.04 using Netplan.

1. Check Current Network Status

Before making changes, identify your network interface name and current configuration.

# Check IP address and subnet mask
ip addr

# Check default gateway
ip route

# Check DNS servers
resolvectl status

2. Configure Netplan

Netplan configuration files are located in /etc/netplan/. The default file is usually named 00-installer-config.yaml or similar.

Backup the existing configuration:

sudo cp /etc/netplan/00-installer-config.yaml /etc/netplan/00-installer-config.yaml.bak

Edit the configuration file:

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

Default Configuration (DHCP):

# This is the network config written by 'subiquity'
network:
  ethernets:
    ens160:
      dhcp4: true
  version: 2

Static IP Configuration:

Modify the file to look like this (replace ens160, IP addresses, and gateway with your own values):

# This is the network config written by 'subiquity'
network:
  ethernets:
    ens160:
      dhcp4: false
      addresses:
        - 192.168.1.2/24
      routes:
        - to: default
          via: 192.168.1.1
      nameservers:
        addresses: [1.1.1.1, 8.8.8.8]
  version: 2

[!IMPORTANT] YAML is indentation-sensitive. Ensure you use spaces (not tabs) and align the keys correctly.

3. Apply Configuration

Apply the changes using Netplan.

sudo netplan apply

If there are no errors, verify the new IP address:

ip addr show ens160