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Linux Feed

Linux Support, Oracle Linux, Red Hat Enterprise Linux, SUSE, Oracle Unbreakable Enterprise Kernel and the Oracle Unbreakable Linux Support Program (ULN) resources, news, and support articles.

How do you install Node.JS on CentOS?

There's a ton of outdated information floating around the web on how to simply and effectively install Node.JS on CentOS, specifically one of my legacy boxes that runs 5.11. I spent about 15-20 minutes toying around with various hacky ways to do this. To save you the time, here's the easiest way I found:
Perform (as root):

curl -sL | bash -
yum install -y nodejs

Command-line network speed testing

Is your web app slow? Is network bandwidth the problem? To diagnose the problem, begin by measuring the network bandwidth. Many users run the popular, web-based to capture speed performance data. This is a good solution if the X Window System is installed on the webserver. However, I have a Linux VPS server without an X graphical environment. Command line is the only viable way to perform a speed test on that server.

ApacheCon NA’15 slide deck: Operating CloudStack – Sharing my Tool Box

Here are the slides from my presentation at both ApacheCon and CloudStack Day in Austin, TX. Get the code on Github.Filed under: CloudStack Tagged: apachecon, cloudstack, python, talk

How to n-up pages in a PDF or PPT file via the command-line

Suppose you downloaded a PowerPoint or a PDF file from slideshare. You liked it so much that you wanted to print it out. But, alas, it was 50 pages long. This tutorial introduces the command-line tools to n-up a PPT or PDF file, i.e., batch multiple pages of the input file onto a single page on the output file. The output file is of the PDF format.To 2-up a file, you place 2 original pages on a single output page. Similarly, to 4-up a file, 4 original pages on a single output page. By n-upping a file, you drastically reduce the number of pages for printing.

Food Keeper App

The FoodKeeper can help consumers use food while at peak quality and reduce waste. The storage times listed are intended as useful guidelines and are not hard-and-fast rules. Some foods may deteriorate more quickly while others may last longer than the times suggested.

Adding a KVM cluster with NSX networking to CloudStack

As KVM seems more and more interesting, at work we wanted to do a Proof-of-Concept. The KVM hypervisor cluster had to be controlled by CloudStack and also integrate with NSX (formerly known as Nicira). NSX is owned by VMware these days and is one of the first Software Defined Networking solutions. At Schuberg Philis we […]

IPoIB working modes

The IPoIB driver supports two modes of operation: Unreliable Datagram (UD) and Connected Mode.
In Unreliable datagram mode, the IB UD (Unreliable Datagram) transport is used and so the interface MTU has is equal to the IB L2 MTU minus the IPoIB encapsulation header (4 bytes).  In QDR, the default NTU value is 2044. In FDR onwards, the default MTU value for Unreliable Datagram is 4096.

What are the F1 through F12 keys?


  • Almost always used as the help key, almost every program opens a help screen when this key is pressed.

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