Linux

What you'll learn After completing this course, you will be a professional Linux administrator and ready to apply for Linux jobs. Acquire advanced knowledge of Linux system administration and gain a deep understanding of Linux fundamentals and concepts. By taking this course you'll administrate Linux servers in a corporate environment....

SSH is used for logging into servers to run the commands and programs remotely. However, sometimes you might want or even need to automatically log in to an SSH server without entering your username and password. The two most popular mechanisms to log into remote systems via SSH are password-based authentication and key-based authentication. Username...

What is Cron?How Cron WorksCron Files and DirectoriesUser CrontabsSystem-Wide CrontabCron’s DirectoriesCron Syntax BasicsMinute (0-59)Hour (0-23)Day of Month (1-31)Month (1-12)Day of Week (0-6)Command or ScriptSpecial Characters in Cron SyntaxWhen Does a Cron Job Start?Cron Jobs and PathsSetting Up and Managing Cron JobsCreate User’s Cron JobCreate a System-Wide Cron JobListing User Cron...

By default, the SSH server runs on port 22. However, there are occasions when it is run in a different port. The -p  option can specify the port number to connect to when using the ssh command on Linux. For example, if you want to access a remote server that listens on port 2222, then...

SSH tunneling or SSH port forwarding is a method of creating an encrypted SSH connection between a client and a server machine through which services ports can be relayed. Local SSH Tunnel with Port Forwarding You can use a local ssh tunnel when you want to get to a resource...

Password authentication is the default method most SSH clients use to authenticate with remote servers, but it suffers from potential security vulnerabilities like brute-force login attempts. An alternative to password authentication is using authentication with SSH key pair, in which you generate an SSH key and store it on your computer....

Secure Shell (SSH), a protocol widely used for secure remote login from one computer to another, offers robust encryption to protect against unauthorized access. However, with the increasing sophistication of cyber threats, relying solely on traditional password-based authentication can leave systems vulnerable to brute-force attacks and password theft. This is...

What’s SSHGuard?SSHGuard vs Fail2Ban: Key DifferencesDefault Services Monitored:Ease of Configuration:Installing SSHGuard on LinuxFedoraConfigure SSHGuardSSHGuard Configuration When Using UFW/nftablesSSHGuard Configuration When Using iptablesSSHGuard Configuration When Using firewalldWhitelisting IP Addresses SSH (Secure Shell) serves as a critical entry point to your server, offering a powerful, encrypted method of remote administration. However, its...

Knowing who and when logs to your Linux server via SSH is always a good idea. Even if you’re the only one with access, it’s good practice to keep an eye on connections. For teams or production systems, getting notified about SSH logins adds an extra layer of awareness and...

Are you preparing for the Red Hat Certified Engineer (RHCE) EX294 exam? Boost your chances of success with the comprehensive Ansible Automation study guide by Andrew Mallett! What you’ll learn: Core concepts of Ansible automation on Red Hat Enterprise Linux 8 Hands-on exam objectives with practical examples Step-by-step instructions for...