A Linux system administrator is expected to know how to configure a system’s DNS settings. Nearly all modern Linux distributions use NetworkManager to handle a host’s DNS settings. In this learning activity, we will utilize the `nmcli` utility to configure our DNS resolution.
Learning Objectives
Successfully complete this lab by achieving the following learning objectives:
- Review current DNS configuration.
You have successfully been able to ping the gateway for the network. Now you need to verify that the system is capable of communicating with the network. Do the following to complete the review:
- Run the
hostcommand to see if your system can resolve hostnames to IP addresses. - Check to see what DNS server entries you have in the
/etc/resolv.conffile.- Review your network connections via the
ipand thenmclicommands.
- Review your network connections via the
- Your default connection should be highlighted with the name
System ens5. (Hardware changes may result in the name of the active interface changing, proceed with the lab using the name shown in place of ‘ens5’.) - Use the
nmclicommand again to review your DNS IP settings.
- Run the
- Configure your system to use your network’s DNS.
- Use the
nmclicommand to modify the system’s default connection to use the network’s DNS server. - Verify the settings by using the
nmclicommand, and by checking the/etc/resolv.conffile. - Re-activate the network connection to have our
/etc/resolv.confshow the new DNS server. - Verify your settings once more.
- Attempt to resolve a hostname to an IP address.
- Use the
