LPIC-2

Welcome to our tutorial on how to install and configure local DNS Server using Dnsmasq on Ubuntu 20.04. "Dnsmasq is a lightweight, easy to configure, DNS forwarder and DHCP server. It is designed to provide DNS and optionally, DHCP and TFTP, to a small network. It can serve the names of local machines which are not in the global DNS". If...

In this tutorial, we will discuss how to install and setup caching-only DNS server using BIND9 on Ubuntu 20.04. The Berkeley Internet Name Domain (BIND 9) is a versatile, classic and complete name server software that implements an Internet domain name server. It is the most widely-used name server software on the Internet. DNS on the hand refers to...

In most cases whenever your Linux Server experience a performance slow down, the first thing you would want to check is the CPU or Memory usage using top, htop or any othet command. However all my seem well except the I/O Wait (wa, %iowait), a form of CPU idle time when nothing could be scheduled since the CPU has...

Linux provides a handful tools for measuring and checking memory usage. In this tutorial, we are going to learn a quite a number of these tools so that we can be able to troubleshoot any memory related issues. free free command is one of the most popular commands for checking free and used physical memory as well as swap space on...

CPU is critical to every other system operations. If a process consumes too much of CPU such that it becomes unavailable to other process, it causes performance bottleneck. Therefore, in order to troubleshoot any CPU related problems, you can use any of the following tools. iostat The iostat command is used to report the CPU statistics as well as input/output statistics...

Capacity Planning is the first topic of the LPIC-2 exam 201-405 It covers the following objectives as described in LPIC-2 Exam 201-405 Objectives. Measure and Troubleshoot Resource Usage Predict Future Resource Needs In order to meet the first objectives, the following utilities are covered. iostat The iostat command is used to report the CPU as well as input/output statistics for devices and...

Topic 207: Domain Name Server 207.1 Basic DNS server configuration Weight: 3 Description: Candidates should be able to configure BIND to function as a caching-only DNS server. This objective includes the ability to manage a running server and configuring logging. Key Knowledge Areas: BIND 9.x configuration files, terms and utilities Defining the location of the BIND zone files in BIND configuration files Reloading modified configuration and zone files Awareness...

Topic 200: Capacity Planning 200.1 Measure and Troubleshoot Resource Usage Weight: 6 Description: Candidates should be able to measure hardware resource and network bandwidth, identify and troubleshoot resource problems. Key Knowledge Areas: Measure CPU usage Measure memory usage Measure disk I/O Measure network I/O Measure firewalling and routing throughput Map client bandwidth usage Match / correlate system symptoms with likely problems Estimate throughput and identify...