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Configuring SELinux

In this lab we will edit SELinux settings, using booleans to allow communications between services. Then we will place SELinux into *enforcing* mode and ensure that setting is persistent. *This course is not approved or sponsored by Red Hat.*

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Path Info

Clock icon Intermediate
Clock icon 30m
Clock icon May 17, 2019

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Table of Contents

  1. Challenge

    Permit `httpd` to Communicate with Zabbix

    1. Find the necessary boolean to permit httpd to communicate with Zabbix.
    [root@host]# getsebool -a | grep zabbix
    - We'll see the boolean is *off*
    1. Set the boolean to "on"
    [root@host]# setsebool -P httpd_can_connect_zabbix on
    1. Verify that change took effect
    [root@host]# getsebool -a | grep zabbix
    - Now we'll see that the boolean is *on*.
  2. Challenge

    Put SELinux into *enforcing* Mode and Ensure That the Setting Is Persistent

    1. Check the SELinux state
    [root@host]# getenforce

    This will show that it is in permissive mode, so we need to change it to enforcing mode.

    1. Put SELinux into enforcing mode
    [root@host]# setenforce 1
    1. Check to make sure SELinux is now in enforcing mode
    [root@host]# getenforce

    We can see our change worked and SELinux is now in enforcing mode.

    1. Ensure SELinux boots into enforcing mode

      Edit the SELinux configuration file:

      [root@host]# vi /etc/selinux/config

      Type i to enter Insert mode, arrow down to the SELINUX line, and set it to enforcing:


      Type Esc, then :wq to exit. When the server boots again, SELinux will remain in enforcing mode.

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