Basic Linux Administrator Knowledge
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In this video, we'll briefly cover basic operations in Linux operating systems, using Debian/Ubuntu as an example.
How to connect to a Linux server. Filesystem overview, directory navigation, file and directory permissions. Using sudo and su for Linux superuser operations. Using cat to view files, less for scrolling through files, and grep for filtering data. We'll also look at where operating system and service logs are stored. How to configure services and manage them using init.d and systemctl. How to diagnose service startup errors. How to modify a file. We'll also cover rebooting a Linux server. How to change file permissions using the chmod command. Check the Linux server status. Check the Linux filesystem. Kill a process in Linux. Run a process in the background using nohup. Reboot a Linux server using reboot.
00:00 Connecting to a server via SSH
01:00 Using sudo and su to gain root privileges
02:30 Using df to check free disk space
03:10 Using ls -al to view files in a directory
05:27 Using cat /etc/issue to view the distribution version
06:30 Using cat in Linux
07:00 Viewing file permissions. Changing permissions with chmod
08:50 Using less in Linux
09:25 Redirecting output to a file using the angle bracket character
09:44 Using su to gain superuser privileges
10:10 Using vi and vim editors in Linux How to exit vim
11:00 Nano text editor
11:40 Installing packages with apt-get
13:00 Installing and running mc (Midnight commander)
13:40 PHP server configuration
14:00 /etc configuration files: resolv.conf and hosts
14:20 Using ps ax to view current processes in the system
15:20 init.d for starting and stopping services
17:00 systemctl for starting and stopping services
19:00 Web server logs and log rotate
19:50 Grepping logs with grep
21:10 Stopping a process with kill
22:00 Using htop to analyze server load
27:20 How to reboot a Linux server and what problems can arise
28:20 Using ping for network diagnostics
30:00 Running a command in the background with nohup
32:10 tail -f for scanning and filtering logs
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