Install/2-2/Networking

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Configure Networking

Find out your server's current IP address by logging in to your server and running the command:

    ip a

Go to the Netplan configuration directory and open your network config file. Depending on how you installed Ubuntu, this could be 01-netcfg.yaml, 50-cloud-init.yaml, or something else.

    cd /etc/netplan
    sudo joe 50-cloud-init.yaml

This file may also be called 00-installer-config.yaml, or something else depending on how you set up your Ubuntu Server installation. The contents of the file will look something like this:

    network:
        ethernets:
            enp0s3:
                dhcp4: true
        version: 2

This is a DHCP (automatic IP) setup on the network interface "enp0s3". Change it to look something like this (will vary depending on your network setup):

    network:
        ethernets:
            enp0s3:
                addresses: 
                  - 10.10.1.99/24
                dhcp4: false
                nameservers:
                    addresses: [8.8.8.8, 8.8.4.4]
                # Default Gateway Config
                routes:
                  - to: default
                    via: 10.10.1.1
        version: 2

The above sample configuration would give your server the address 10.10.1.99. The gateway of your network can be anywhere but is generally at address "1" of the range. The DNS nameservers configured here are Google's. You may have different DNS servers to input instead.

Note: As this file is a YAML file, indentation is important. If you do not indent the lines so that they are in a correct hierarchy as above, you will receive an error when running the commands below.

Apply the networking changes

    sudo netplan apply

You should now be able to access your server. You can run

    ifconfig

to confirm the IP has changed.