http://www.thegeekstuff.com/2009/06/how-to-disable-selinux-redhat-fedora-debian-unix/

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On some of the Linux distribution SELinux is enabled by default, which may cause some unwanted issues, if you don’t understand how SELinux works and the fundamental details on how to configure it. I strongly recommend that you understand SELinux and implement it on your environment. But, until you understand the implementation details of SELinux you may want to disable it to avoid some unnecessary issues.
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To disable SELinux you can use any one of the 4 different methods mentioned in this article.

The SELinux will enforce security policies including the mandatory access controls defined by the US Department of Defence using the Linux Security Module (LSM) defined in the Linux Kernel. Every files and process in the system will be tagged with specific labels that will be used by the SELinux. You can use ls -Z and view those labels as shown below.

# ls -Z /etc/

-rw-r--r--? root root? system_u:object_r:etc_t:s0?????? a2ps.cfg
-rw-r--r--? root root? system_u:object_r:adjtime_t:s0?? adjtime
-rw-r--r--? root root? system_u:object_r:etc_aliases_t:s0 aliases
drwxr-x---? root root? system_u:object_r:auditd_etc_t:s0 audit
drwxr-xr-x? root root? system_u:object_r:etc_runtime_t:s0 blkid
drwxr-xr-x? root root? system_u:object_r:bluetooth_conf_t:s0 bluetooth
drwx------? root root? system_u:object_r:system_cron_spool_t:s0 cron.d
-rw-rw-r--? root disk? system_u:object_r:amanda_dumpdates_t:s0 dumpdates

Method 1: Disable SELinux Temporarily

To disable SELinux temporarily you have to modify the /selinux/enforce file as shown below. Please note that this setting will be gone after the reboot of the system.

# cat /selinux/enforce
1

# echo 0 > /selinux/enforce


# cat /selinux/enforce
0

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You can also use setenforce command as shown below to disable SELinux. Possible parameters to setenforce commands are: Enforcing , Permissive, 1 (enable) or 0 (disable).

# setenforce 0

Method 2: Disable SELinux Permanently

To disable the SELinux permanently, modify the /etc/selinux/config and set the SELINUX=disabled as shown below. One you make any changes to the /etc/selinux/config, reboot the server for the changes to be considered.

# cat /etc/selinux/config

SELINUX=disabled
SELINUXTYPE=targeted
SETLOCALDEFS=0

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Following are the possible values for the SELINUX variable in the /etc/selinux/config file

• enforcing – The Security Policy is always Encoforced
• permissive - This just simulates the enforcing policy by only printing warning messages and not really enforcing the SELinux. This is good to first see how SELinux works and later figure out what policies should be enforced.
• disabled - Completely disable SELinux

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Following are the possible values for SELINUXTYPE variable in the /etc/selinux/config file. This indicates the type of policies that can be used for the SELinux.

• targeted - This policy will protected only specific targeted network daemons.
• strict - This is for maximum SELinux protection.

Method 3: Disable SELinux from the Grub Boot Loader

If you can’t locate /etc/selinux/config file on your system, you can pass disable SELinux by passing it as parameter to the Grub Boot Loader as shown below.

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# cat /boot/grub/grub.conf

default=0
timeout=5
splashimage=(hd0,0)/boot/grub/splash.xpm.gz
hiddenmenu
title Enterprise Linux E