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Managing SELinux on RHEL 8

Security Enhanced Linux (SELinux), is an additional layer of system security, that enhances the other security mechanisms in RHEL 8. In this hands-on lab, we will examine SELinux at a high level, will set and check enforcing and permissive modes for SELinux, list and identify SELinux file and process context, restore default file contexts, use boolean settings to modify system SELinux settings, and diagnose and address routine SELinux policy violations on RHEL 8. *This course is not approved or sponsored by Red Hat.*

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Lab Info
Level
Intermediate
Last updated
Sep 23, 2025
Duration
30m

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Table of Contents
  1. Challenge

    Diagnose a Reported Apache Server Issue
    1. Discover an Apache Server access issue.
    2. Attempt to start Apache and view status.
    3. Query the system journal for errors and issues.
    4. Test if the issue is SELinux-related.
  2. Challenge

    Troubleshoot Possible SELinux Errors Affecting Apache
    1. Re-enable SELinux and check the status.
    2. Investigate audit and other logs for errors.
    3. Discover the issue is related to the non-standard port.
  3. Challenge

    Create and Apply a Local Policy Module to Fix the Apache Issue
    1. Use ausearch and audit2allow to generate a local policy module.
    2. Investigate the generated policy module files.
    3. Apply the policy module.
    4. Test apache access.
  4. Challenge

    Clean Up any Additional SELinux-related Issues
    1. Check the logs again for errors.
    2. Find getattr issues for httpd files.
    3. Set context for the affected files.
    4. Test for any additional errors.
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