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Red Hat Linux Geek

Redhat, Fedora, CentOS HowTos, Tips, Tricks and more

Linux

How to broadcast a message to all logged in users

2016-02-02
By: Administrator
On: February 2, 2016
In: BASH, Linux
With: 0 Comments

If you are system Administrator, you know at times you need to send out a broadcast message to all logged in users like when you need to reboot a server and hence warning users to log off or face losing their work and data. How do you do it?Read More →

Remove a disk from Redhat/Centos Linux without rebooting the system

2015-05-05
By: Administrator
On: May 5, 2015
In: Linux
With: 1 Comment

Once a disk/lun is no longer required, it is a good practice to remove the disks cleanly from the system and tidy up. What more? this can be done without a server reboot.Read More →

Drop/Flush Linux disk cache

2013-10-12
By: Administrator
On: October 12, 2013
In: Disk, Linux
With: 0 Comments

I recently came across a situation where Apache Tomcat cannot start as there was no memory available to allocate to the Java heap (-Xms 1024) when the server had 8GB of physical memory installed. We all know the Linux Kernel borrows unused memory on the system for Disk Cache and releases it when an application needs it. Sadly, things didn’t work out this time and I blame it on Java.Read More →

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