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Disable Sleep mode in CentOS7/RHEL7 laptop on lid close

The following tip will help you to disable the powersaving or sleep mode behavior of your CentOS or RHEL laptop or desktop. If GUI is present, the following steps will help.

Applications => Utilities => Tweak Tool => Shell => Don't suspend on lid close => ON

But if GUI is not installed, then the only option is to disable this from the commandline. It is very easy, don’t worry. Who cares about the GUI in Linux. ? 🙂 (I love the black screen)

Open /etc/systemd/logind.conf, then make edit in the following configuration. By default, the value of this config will be suspend

HandleLidSwitch=ignore

man logind.conf will provide the complete details about this configuration file. Hope this tip helps.

 

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Disable SELinux in CentOS and RHEL

Security-Enhanced Linux (SELinux) is a security architecture integrated into the 2.6.x kernel using the Linux Security Modules. It is a project of the United States National Security Agency (NSA) and the SELinux community. SELinux integration into Red Hat Enterprise Linux was a joint effort between the NSA and Red Hat.

Most of the application needs SELinux to be turned off. Turning off selinux is simple. You can use the following steps to turn off selinux in RHEL or CentOS 6 and 7 operating systems.

Open the file /etc/sysconfig/selinux . The contents will be similar as below.

# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
# enforcing - SELinux security policy is enforced.
# permissive - SELinux prints warnings instead of enforcing.
# disabled - SELinux is fully disabled.
SELINUX=disabled
# SELINUXTYPE= type of policy in use. Possible values are:
# targeted - Only targeted network daemons are protected.
# strict - Full SELinux protection.
SELINUXTYPE=targeted

 

The contents are self explanatory. Change the value of SELINUX as disabled and save the file. Then reboot the system.