Tag: CentOS

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Install SpamAssassin on CentOS 6

SpamAssassin is an e-mail spam filter which uses content-matching rules. For this install, CentOS 6.6 (64-bit) and Sendmail are used. Enable EPEL repository. One way is to download and install the EPEL repository. Another is to edit the /etc/yum.repos.d/epel.repo file and change enabled=0 to enabled=1 under the [epel] section. Yet another way to enable EPEL repository. Install Sendmail and spamassassin….

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Linux: The Bash Bug Test and Fix

A bug which could allow for arbitrary code execution has been discovered, Red Hat alerted, and patches exist. So, I simple yum update should take care of things. However, Red Hat offers command line arguments which may be used to test for the vulnerability. Using the command issued below, different warnings may appear, however, the following result is one of...Read More »
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One Way to “sysprep” a Linux Template to Clone

An anoyance with cloning a Linux virtual machine is that the /etc/sysconfig/network-scripts/ifcfg-eth0 file may contain a UUID and HWADDR which can be removed and the /etc/udev/rules.d/70-persistent-net.rules can be deleted or zero’ed out. So, here are the steps I use to create a “template”. Remove the UUID and HWADDR lines from the /etc/sysconfig/network-scripts/ifcfg-eth0 file. > /etc/udev/rules.d/70-persistent-net.rules to zero it out. Run…

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Linux Centos 6 PYCURL ERROR 6 error RESOLVED!

A particular virtual machine running Linux CentOS 6.5 had been problematic when it came to yum updates. The result always ended with a PYCURL ERROR 6 – Couldn’t resolve host. After spending way too much time towards resolution, a solution finally came to light. The configuration of the system is a Linux CentOS 6.5 build with two network cards. One…

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Break the 2TB limit in Linux with gdisk

Without going into too much detail, for over 30 years the MBR has been the hard drive partition standard, which has a 2TB limit. GPT replaces MBR with one of it’s key benefits, exceeding the 2TB limit. While the fdisk tool is dated, there are several other tools that handle 2TB drives and beyond. gdisk One such tool, is gdisk,…

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[Resolved] Katello client returns 403 PYCURL errors when using yum

While testing a client connection to a Katello server, the client returns an error when any yum command is issued. The error is quite visible with [Errno 14] PYCURL ERROR 22 – “The requested URL returned error: 403 Forbidden”, however, it is not quite clear. While the environments will likely vary, this is the environment used for this test. Environment…

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Use Your VPN Connection in a Linux CentOS VirtualBox Instance

Running Oracle’s VirtualBox on a Microsoft Windows 7 desktop to test applications and operating systems has proven to be very productive. As a result of a VPN connection using Citrix, a VirtualBox VM of CentOS 6.5 Linux could not connect to the remote network. After combing through the Internet, a solution is born. I know that there are many variables…

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Install Adobe Reader on CentOS 6.5

While perusing through the Internet, I found this site called iF !1 0 “If Not True then False“. I found this write-up on how to install Adobe Reader on one of many different flavors on Linux. I couldn’t pass up on this, since I was in the hunt for Adobe Reader. The process worked great, so here is my slight…

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The Easiest Method To Install Adobe Flash on CentOS/RHEL

This should be easy, install Adobe Flash on a Linux operating system to watch Youtube videos in Firefox. After an hour or so fighting with Adobe Flash, through every method I could find on the Internet, I finally found one that worked, the first time! There are many who write of downloading a compressed file and extracting the needed file...

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Linux: A Homemade script to monitor your websites

It was discovered days later that one of my websites was offline displaying only 500 error messages. As it turned out, it was as a result of the .htaccess files. The .htaccess files did not include <IfModule XXXXX> </IfModule> around the directives. Tracking down the offending lines, it was determined that the lines were all part of the mod_headers.c module....

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A Quick Guide to VNC Server on CentOS 6

After searching through several guides, all complete in one way or another, however, not complete enough, I put the pieces together into this guide. This particular configuration is a basic VNC server with two users. After creating the second user, the process can be repeated for additional users. Install the VNC Server Edit the /etc/sysconfig/vncservers file. Note that on the…

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Convert a CentOS 6 install to a Scientific Linux 6 install

CentOS, Scientific Linux ("SL"), and Oracle Linux are all based on the Red Hat Enterprise Linux ("RHEL") code base. Though there are differences between them, the similarities are more than not. For whatever the reason, there are documented processes that permit the conversion from one of the aforementioned Linux distros to another. This conversion will document another approach based on...

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