Learn Linux Administration Through Practical Examples – Gabriel Avramescu

Requirements

Have passion to learn and improve

You should be able to perform basic commands in Linux. This course is not for absolute beginners. However, you only need to have a basic understanding of what Linux is and to be able to open a terminal and use simple commands as changing the directory and listing files.

Have at least one Linux virtual machine (Ubuntu, Debian, CentOS, RHEL ..)

Description

This course was designed to share my experience as a Linux system administrator through practical examples and scenarios. If you would like to start a career in Linux or simply improve your knowledge, this course is for you. Throughout the course, I will show you many of the tasks you would encounter when administering a Linux server.

Since being a system administrator, I know you might need to deal with more than only one Linux distribution, what I teach in this course, applies to many of them.

I know that the best way to learn something is by actually doing it, so I created this course by showing how to accomplish the tasks rather than just explaining how to do them in theory. Moreover, along with the video lectures, you will also find exercises to help you improve your hands-on experience. You will benefit for free from any new lectures and updates on the course.

Who is the target audience?

People who would like to take up their Linux knowledge to an upper level

Those who want to start a career as a Linux system administrator

Developers who need to administrate a Linux server

Course Curriculum

Introduction

• Tips&Tricks (11:14)

System Startup

• Introduction (0:37)
• Understanding runlevels and targets (2:56)
• Current and default runlevel (1:30)
• Default runlevel Ubuntu – init (0:37)
• Listing services in certain runlevels (1:58)
• Enable/disable a process from starting at boot – init (6:10)
• Default target – systemd (1:10)
• Dealing with processes – systemd (1:16)
• Exercise 1 – System Startup

Disk Management

• What is LVM? (2:11)
• Steps on how to create a volume group (1:18)
• Steps on how to extend an existing volume group (0:22)
• Steps on how to decrease disk space by reducing the volume gruop (0:59)
• Add virtual disk in VMware Workstation Player (0:41)
• Add virtual disk in Oracle VM VirtualBox (1:05)
• Create volume group and logical volume (5:39)
• Extend existing volume group and logical volume (2:31)
• Reduce logical volume (3:13)
• Resize filesystem and logical volume (1:22)
• Quiz – Extend Disk Space
• Exercise 2 – Disk Management

Network & Security

• Introduction (0:51)
• Change the hostname (0:48)
• DNS nameservers (3:11)
• Resolve queries locally eith /etc/hosts (1:34)
• Determine the order for DNS queries (0:47)
• Setup a static ip Debian/Ubuntu (4:11)
• Exercise 3.1 – Network configuration
• Setup alias ip (1:30)
• ip vs ifconfig commands (6:15)
• Adding routes (6:33)
• Network configuration for CentOS/RHEL (3:48)
• Connect remotely with SSH (6:56)
• Servers fingerprints (2:57)
• Exercise 3.2 – Generate ssh keys
• Setup firewalls with iptables (7:02)
• iptables-persistent (6:02)
• Exercise 3.3 – Setup iptables
• Quiz – DNS Configuration

Network Troubleshooting

• Introduction (1:50)
• Ping command (4:13)
• What happens behind the ping command (1:03)
• Traceroute command (1:20)
• Open connections netstat&ss (6:43)
• Capturing network traffic with tcpdump (5:46)
• Deciphering the output of tcpdump (3:49)
• Exercise 4 – Capture packets with tcpdump
• Quiz – Identify open connections

System Troubleshooting

• Introduction (1:05)
• Swap&Swappiness (3:08)
• Identify the system's resources (6:50)
• Check system's resources usage (4:28)
• Keep an eye on something – the watch command (1:57)
• Real-time view tools (8:44)
• Get historical data (5:00)
• Check running processes (2:52)
• Check open files (4:04)
• Exercise 5.1 – System Resources
• Log messages and rsyslogd daemon (3:59)
• Checking log files (10:14)
• Rotate logs (9:08)
• Schedule jobs with at (8:14)
• Schedule jobs with cron (9:43)
• Exercise 5.2 – Schedule jobs
• Anacron (4:28)
• Quiz – System Troubleshooting

Network File System

• NFS Introduction (3:19)
• Setup NFS (7:43)
• Mount filesystem permanently (3:43)
• Exercise 6 – Network File System

User Management

• Adding users (4:15)
• Manage groups & delete users (2:36)
• Lock accounts (4:07)
• Limit disk space for users with quota (7:46)
• Disk limit wit quota – practical example (4:14)

Conclusions & Final Quiz

• Change root password
• Interview questions
• Congrats!
• Final Quiz

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