UniFi Controller Setup Wizard 1
If you’re running the Ubiquiti UniFi Controller on a Linux box (I run mine on CentOS), the default instructions from UBNT walk you through building a simple SysV init script to run the Java .jar file as a service. I was in a tinkering mood, so I re-wrote the SysV startup script on my […]

Improved Startup Script for Ubiquiti UniFi Controller on Unix / ...

Linux Uptime 11
If you’re looking for the fastest and easiest way to get DMARC verification working on a RedHat (Fedora, RHEL or CentOS) mail server, I highly recommend OpenDMARC. I’m a bit biased, as I currently maintain the OpenDMARC package in the Fedora and EPEL repositories. This article will help you install the […]

Installing OpenDMARC RPM via Yum with Postfix or Sendmail (for ...

Postfix 2.9 Upgrade 6
I’ve previously written a how-to for compiling Postfix from source on a CentOS 5 box. I recently tried following the same steps on a CentOS 6 box, to upgrade from Postfix 2.6.6 which is installed by default. I’m glad to report that the same instructions will work just fine to upgrade […]

Building Postfix 2.10 on RHEL6 / CentOS 6 from Source

Backup... TO THE CLOUD! 8
I often say there are only two types of data: data that is backed up, and data that is waiting to be lost. Even if you’re the most contentious hax0r who always backs up your data, if your backups are stored in the same physical location as the source data, […]

How to Back Up a Linux Server to Amazon S3 ...

DKIM Test Message 143
For those who want or need to compile and install OpenDKIM from the source code, you can follow the instructions I wrote in this article. If you’re looking for the fastest and easiest way to get OpenDKIM running on a RedHat or CentOS system, I currently maintain the OpenDKIM package in […]

Installing OpenDKIM RPM via Yum with Postfix or Sendmail (for ...

You don’t need a Windows Media Center PC to share pictures, videos, or music with an Xbox 360. If you’ve got a Fedora / RHEL/ CentOS box on your home network and you’d like to use it as a UPnP and DLNA Media Server so that you can stream files […]

How to set up uShare media server on Fedora / ...

Before proceeding with this tutorial, and at the risk of possibly overstating what is obvious to some, I want to make three things clear:

How to get DKIM and DomainKeys working with Postfix on ...

This blog post builds on the same workaround explained in my older post about how to install the 32-bit version of Dell OMSA 6.3 on a 64-bit version of RHEL / CentOS 5.5 on a PowerEdge server so you can manage a PERC 4 RAID adapter. Dell’s newer OMSA 6.4 […]

“No controllers found” fix: set up Dell OMSA 6.4 32-bit ...

UPDATE 7/11/15: The following procedure will work on RHEL/CentOS 7, 6, and 5 systems to upgrading from those systems’ default versions to Postfix 3.02. CentOS (a non-commercial clone of RedHat’s RHEL) is my server operating system of choice because it’s extremely stable and widely-used. One of the reasons it’s so stable is […]

Building Postfix on RHEL / CentOS from Source

UPDATE: If you’d like to run the newer OMSA 6.4, please read this updated blog post. If you’d rather install OMSA 6.3, then please continue! If you’re running a 64bit version of RHEL 5.5 or CentOS 5.5 on a slightly older Dell PowerEdge server with a PERC 4 or earlier […]

“No controllers found” fix: set up Dell OMSA 6.3 32-bit ...

Linux Uptime 179
Update! RPMs and Yum now available. I build and maintain the RPM packages of OpenDKIM for RHEL/CentOS and Fedora, which are available with Yum. For a much quicker and easier way to install OpenDKIM, read this. Of course, if you still prefer to go old-skool and compile your own binaries […]

How to get DKIM (DomainKeys Identified Mail) working with Postfix ...

Linux 4
I recently noticed that my /boot partition was at 95% full, so I investigated to see what was causing it. Apparently, it was filling up with older versions of the linux kernel as a result of upgrades. Because my system has been very stable, I decided to keep only the […]

Removing Old Kernels on Fedora, RHEL, or CentOS with Yum

For about a year now, we’ve been happily running two Dell PowerEdge 2950s with quad procs, 4GB of RAM (or so we thought), and RHEL5. Running a high-traffic website can be memory intensive, so we recently decided to upgrade the memory, and bought 8 more GB of RAM for each […]

Running more than 4GB RAM on Fedora, RHEL, & CentOS