How to set up 1.1.1.1 on linux with terminal

Cloudflare’s 1.1.1.1 DNS is known for speed and privacy. You can configure it easily on any Linux system using just the terminal.

Step 1: Backup existing DNS settings

Before making changes, it’s a good idea to back up your current DNS configuration.

sudo cp /etc/resolv.conf /etc/resolv.conf.backup

This creates a copy of your current DNS settings in case you want to revert later.

Step 2: Set 1.1.1.1 manually as your DNS

Open the DNS configuration file:

sudo nano /etc/resolv.conf

Replace its content with:

nameserver 1.1.1.1
nameserver 1.0.0.1

Save and exit (Ctrl+O, then Enter, then Ctrl+X). These are Cloudflare’s primary and secondary DNS servers.

Step 3: Prevent DNS from resetting on reboot

To stop network services from overwriting your changes:

sudo chattr +i /etc/resolv.conf

This locks the file to prevent automatic changes by NetworkManager or DHCP.

Step 4: Test your DNS resolution

Check if your system is using Cloudflare DNS correctly:

dig @1.1.1.1 dropvps.com

If you receive a valid response, your system is using 1.1.1.1 as intended.

Optional Step: Restore original DNS settings

If you want to undo changes, remove the lock and restore the backup:

sudo chattr -i /etc/resolv.conf
sudo mv /etc/resolv.conf.backup /etc/resolv.conf

This returns your system to its previous DNS configuration.