Red Had Linux

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“Red Hat Enterprise Linux 8.0 RH124 - Red Hat System Administration”

Red Hat System Administration


, designed for IT professionals new to Linux system administration. It provides foundational skills necessary to manage Red Hat Enterprise Linux (RHEL) systems, with hands-on exercises, guided labs, and quizzes.

Main To Starting RHCSA

  1. Getting Started with RHEL

    • Introduction to Linux concepts and basic commands.

    • Orientation to classroom/lab environment and virtual machine controls.

  2. Accessing and Using the Command Line

    • Using Bash shell commands, navigating filesystems, and connecting via desktop or SSH.

  3. File Management

    • Understanding Linux file hierarchy, creating/moving files, making links, and using shell expansions.

  4. Getting Help

    • Using man pages, info documentation, and help commands.

  5. Editing and Redirecting Files

    • Redirecting output, using text editors from the shell, and modifying shell environments.

  6. User & Group Management

    • Creating, modifying, and deleting users and groups, managing passwords, and superuser access.

  7. File Permissions

    • Reading and changing file permissions, setting default permissions (umask).

  8. Process Management

    • Listing, controlling, killing, and monitoring processes and jobs.

  9. Services and Daemons

    • Managing systemd services, enabling/disabling them, and checking status.

  10. SSH Configuration

    • Setting up secure remote access, key-based authentication, and customizing SSH settings.

  11. Logs and Time Management

    • Viewing syslog and journal entries, preserving logs, and maintaining accurate system time.

  12. Networking

    • Configuring interfaces, hostnames, and name resolution both via CLI and config files.

  13. Archiving & Transferring Files

    • Using tar, scp, and rsync for backups and secure transfers.

  14. Software Management

    • Installing, updating, and removing packages with yum and managing repositories.

  15. Accessing File Systems

    • Mounting/unmounting filesystems, locating files, and identifying devices.

  16. Server Analysis and Support

    • Using Red Hat Insights, customer portal, and troubleshooting tools.

  17. Comprehensive Review & Labs

    • Integrated exercises covering file management, users/groups, processes, networking, and server configuration.

  • File Permission Example:
    chmod 755 filename → Sets read/write/execute for owner, read/execute for group and others.

  • Networking Example:
    nmcli device show → Displays network device configurations.

  • Archiving Example:
    tar -czvf backup.tar.gz /home/user → Creates a compressed tar archive of /home/user.

  • User Creation Example:
    useradd newuser → Creates a new local user account.

  • SSH Key Authentication Example:
    ssh-keygen -t rsa → Generates a new SSH key pair for passwordless login.

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