Chapter 4: Using Shell to Configure and Troubleshoot a Network

Managing processes is an important job of a Linux system administrator. That can be for a variety of reasons – maybe some processes got stuck and we need to finish them, or we want to put some process(es) to work in the background, or even to be started periodically or at a later date. Whatever the scenario is, it's important to know how to administer processes and make them do the work that needs to be done efficiently and with regards to other processes running on the system.

In this chapter, we are going to learn about the following recipes:

• Using nmcli and netplan
• Using firewall-cmd and ufw
• Working with open ports and connections
• Configuring /etc/hosts and DNS resolving
• Using network diagnostic tools