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Red Hat Enterprise Linux Server Cookbook

You're reading from   Red Hat Enterprise Linux Server Cookbook Over 60 recipes to help you build, configure, and orchestrate RHEL 7 Server to make your everyday administration experience seamless

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Product type Paperback
Published in Dec 2015
Publisher
ISBN-13 9781784392017
Length 250 pages
Edition 1st Edition
Tools
Concepts
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Authors (2):
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Jakub Gaj Jakub Gaj
Author Profile Icon Jakub Gaj
Jakub Gaj
William Leemans William Leemans
Author Profile Icon William Leemans
William Leemans
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Toc

Table of Contents (12) Chapters Close

Preface 1. Working with KVM Guests FREE CHAPTER 2. Deploying RHEL "En Masse" 3. Configuring Your Network 4. Configuring Your New System 5. Using SELinux 6. Orchestrating with Ansible 7. Puppet Configuration Management 8. Yum and Repositories 9. Securing RHEL 7 10. Monitoring and Performance Tuning Index

Configuring SELinux port definitions


SELinux also controls access to your TCP/IP ports. If your application is confined by SELinux, it will also deny access to your ports when starting up the application.

This recipe will show you how to detect which ports are used by a particular SELinux type and change it.

How to do it…

Let's allow the HTTP daemon to listen on the nonstandard port 82 through the following steps:

  1. First, look for the ports that are accessed by HTTP via these commands:

    ~# semanage port -l |grep http
    http_cache_port_t              tcp      8080, 8118, 8123, 10001-10010
    http_cache_port_t              udp      3130
    http_port_t                    tcp      80, 81, 443, 488, 8008, 8009, 8443, 9000
    pegasus_http_port_t            tcp      5988
    pegasus_https_port_t           tcp      5989
    ~#
    

    The SELinux port assignment we're looking for is http_port_t. As you can see, only the displayed ports (80, 81, 443, 488, 8008, 8009, 8443, and 9000) are allowed to be used to listen on by any process...

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