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Learn Linux Administration Through Practical Examples
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 (3:14)
Resize filesystem and logical volume (1:23)
Quiz - Extend Disk Space
Exercise 2 - Disk Management
Network & Security
Introduction (0:51)
Change the hostname (0:48)
DNS nameservers (3:12)
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 (4:14)
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 (2:53)
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 (8:15)
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
Default runlevel Ubuntu - init
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