Enable permissive mode for SELinux troubleshooting purpose

Posted on in Categories Linux, RedHat/Fedora Linux, Security, Troubleshooting last updated August 1, 2006

SELinux may create problem for network service if not configured properly. So you can turn off SELinux temporarily i.e. permissive mode for SELinux. In this mode SELinux will continue its work and it will log message to system log files. But it will not block any network service or protected service.

This is great for troubleshooting purpose. For example, squid proxy server or dovecot POP3/IMAP sever known to have problem with SELinux.

You can modify the mode SELinux is running in using setenforce command. Use value 1 to put SELinux in enforcing mode. Use value 0 to put SELinux in permissive mode. Use getenforce command to find out whether SELinux is enforcing, permissive, or disabled.

Get SELinux mode

# getenforce

Output:

Enforcing

Set SELinux mode to permissive mode

# setenforce 0
# getenforce

Output:

Permissive

GUI tools for setting up SELinux mode

If you are using Fedora Core or Red Hat Enterprise Linux use system-config-securitylevel command to setup SELinux mode and other related properties. Type the following command at shell prompt:

$ system-config-securitylevel

Selinux can be disabled by passing kernel boot parameters. You need to edit grub.conf / menu.lst/ lilo.conf file.

Posted by: Vivek Gite

The author is the creator of nixCraft and a seasoned sysadmin and a trainer for the Linux operating system/Unix shell scripting. He has worked with global clients and in various industries, including IT, education, defense and space research, and the nonprofit sector. Follow him on Twitter, Facebook, Google+.

6 comment

  1. Well.what can i say but this website is amazing for open source lover like me ….this is very good website for enhancing the experiance in UNIX envirnoment.
    I love this website very much.and everyday I like to visit this site to enhance my skills.

    Regards
    Satya

  2. For almost four days, I have been struggling to know why my code to access SMTP server failed in Centos 6.2 yet it work in my Win XP development environment. Thanks alot for the post.

    Now I have disabled the SELinux and it is working; the next research is now on how to make this code work with SELinux enabled… a good start anywhy.

    Elkana
    Kenya

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