This is pretty much for my own reference, so please ignore if you already know these. 🙂 Batch convert a directory of PNGs to GIF: mogrify -format gif *.png Resize everything in the directory: mogrify -resize 96x96 -colors 128 -depth 8 * Remove transparency (can make filesizes bigger, so don’t […]
Linux
Since the default version of ImageMagick installed by yum on CentOS 5.5 is 6.2.something, and you want to be able to do all the cool stuff that ImageMagick 6.5.* and 6.6.* can do, you’re gonna have to compile it from source yourself. Don’t worry – it’s easy, and it works.
How to Get ImageMagick 6.5.x or 6.6.x Working on CentOS ...
180 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 ...
Starting with Fedora 10 (and continuing with Fedora 11 and Fedora 13), graphical root login was disabled by default. Allowing root login to the GUI poses a number of security risks, so doing so is not recommended. In most cases, using sudo or simply authenticating as the superuser in the […]
How To Enable Root Login to GUI in Fedora 13
Earlier this year, I wrote a blog post detailing how to set up VNC on a Fedora 12 Box and connect to it from a Windows VNC client securely over the Internet. The original article is here. The steps to setting up VNC on RHEL 5.5 and CentOS 5.5 are […]
Set up VNC on RHEL 5.5 / CentOS 5.5
One of my web servers sent me this email this morning: Subject: The certificate for ServerName.com has expired ################# SSL Certificate Warning ################ Certificate for hostname 'ServerName.com', in file (or by nickname): /etc/pki/tls/certs/server.crt The certificate needs to be renewed; this can be done using the 'genkey' program. Browsers will not […]
Renewing a Self-Signed SSL Certificate on Fedora/CentOS
I’m writing this in a VNC session from Windows 7, via a secure SSH tunnel over the Internet, to a remote Fedora 12 desktop (if you’re running Fedora 14, I’ve written a separate blog post about how to do that, too). If you’d like to be able to do the […]
Set up VNC from Windows to Fedora 12 Over the ...
I’ve got a Dell Studio 1737 laptop, on which I dual-boot Windows 7 and Fedora 12. But with the default graphics drivers installed by FC12, I’d receive an Accelerated Graphics Not Available error message if I tried to enable System > Preferences > Desktop Effects. The solution was to do: […]
Enabling Desktop Effects on Fedora 12 with ATI Radeon HD ...
This post is mostly for my own reference, just in case I need to rebuild a server and want to save myself the Googling. These links helped: Nagios Core 3.x Docs – The quick-start guide was great. I recommend compiling yourself instead of using yum so that your paths match […]
Helpful Links For Setting Up Nagios and NRPE on RHEL ...
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
After successfully setting up a dual boot of Windows 7 (64-bit) and Fedora 12 on my new Dell Studio laptop, I wanted to record some of the tricks that were necessary to get it done. The laptop is a Dell Studio 1737 (why didn’t they call it 1337?) which came […]
Dual Boot Windows 7 and Fedora 12 Linux with Dell ...
UPDATE 10/18/2010: Since writing this post, I have upgraded to CentOS 5.5 and have switched to using OpenDKIM to sign outgoing mail. It will also work great with CentOS 5.4. An updated blog post with step-by-step instructions is here.
DKIM Proxy Install on CentOS 5.4
I found this post from darkness very helpful when I moved from an older RHEL to CentOS 5.4 on a Dell PowerEdge 2650 server: http://darkness.codefu.org/wordpress/2006/09/22/247 Adding: i8042.dumbkbd=1 to the kernel command line (it’s in /boot/grub/grub.conf) worked exactly as advertised. Apart from the keyboard input being a bit slow, and not […]
Remote Access of a Dell PowerEdge 2650 and DRAC III ...
By default, the Broadcom 4306 drivers (which are found in the Acer Ferrari 3000 laptop) are not installed with Ubuntu 9.04. After a fresh install, connect the system to the internet via an Ethernet cable, and run: sudo apt-get install b43-fwcutter then reboot the system. The wireless adapter should now […]