SELinux is very helpful package to more secure your system and you need to specify for access all process, If you want to be disable it.
There are three modes for managing it,
Check the SELinux status by below command,
To Disable Temporarily
# setenforce 0
setenforce: SELinux is disabled
# echo 0 > /selinux/enforce
To Disable permanently
Do you need to set permissive or enforcing (Enabled) mode update in config file.