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Category Archives: Linux

Shell Magic: Set Operations with uniq


I don’t know of anyone else that does this, but it’s a neat little trick for doing finding differences between lists as if they were sets. This is extremely useful when, for example, you want to find a list of things that are in list A, but not in list B. I’ve seen people use […]

PXE Booting RHEL/CentOS (or most other Linux distros)


Introduction I’m a big fan of installing my operating systems over the network.  For many years, I’ve been netbooting Solaris, NetBSD, or OpenBSD on various “real UNIX” platforms like SUN’s SPARC hardware, or VAXen.  In the old days, it wasn’t common for PCs to come with the required firmware for netbooting.  Times have changed, and […]

Quick and Dirty Block Storage for OpenShift


This post is now also on the Official Red Hat OpenShift blog! Do you have an OpenShift installation, maybe a test cluster, but no fancy storage solution to provide your Persistent Volumes? Most people would turn to NFS for this, but did you know that it’s almost as easy to set up a simple iSCSI […]

Consistent Mount Points in Gnome


I keep all my music on a SD card so that I can easily move it between my computers, phone, and MP3 player.  This means no more syncing or duplication. However, with the Gnome auto-mounter, I don’t like the default mount point:  /var/run/$USER/volname.  I greatly prefer having it mounted at ~/Music.  Fortunately, this is easy […]

RAID 6 and LVM


Years ago, I built a big file server to hold all my important stuff. In modern terms, it doesn’t have that much storage: just shy of 4 TB. An external hard drive would be much cheaper, but having a RAID6 array gives me more peace of mind about my data. Up to 2 drives can […]

Serial Consoles in RHEL6


I’m starting to get my server room set up again, so I can start experimenting with VAXes and VMS and things of that nature. Several years ago, I build a terminal server. It’s a little Mini-ITX machines with a JetWay JNC92-230-LF motherboard with proprietary daughter board, the AD4COMC1, that adds four serial ports for a […]

RHEL/Centos 7.0 and CCISS driver


I bought several HP DL360 G4p from Server Monkey to use as test machines for OpenStack. Unfortunately, the HP SmartArray 6i SCSI RAID controller that is installed in these machines is not supported by the RHEL 7.0. The cciss driver required for the controller is still part of the main kernel, it’s just not shipped […]

RTL8168B in Ubuntu Server LTS 8.04


So, This has probably been hashed out several times on the Internet, but I figure one more time wont hurt. I decided to install Ubuntu Server 8.04 LTS on one of my Linux machines. After installation, the ethernet card refused to work. It was detected by the kernel, there was a light on the switch, […]