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Category Archives: rhel
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How to Analyze Network Performance using iperf on Fedora, CentOS & Windows
I’ve been experiencing some slow network connections between a couple of Linux systems (CentOS), Window systems (Server 2008R2), and a NAS device (Netgear ReadyNAS) and wanted to confirm that my network connections weren’t the source of the problem. To limit any variability due to different tools, I decided to use iperf, which can run on […] Continue reading
Posted in centos, fedora, linux, networking, performance, redhat, rhel, Syndicated, sysadmin, tips & tricks, windows
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[one-liner]: Redirecting an Already Running Program’s STDOUT to a File using dupx
Background
Recently I came across this really cool UNIX tool called dupx. I was looking for a way to connect to a program’s STDOUT and STDERR after I had already started it. This was a long running, think 30+ hours job, and I didn’t want to have to stop and restart it. As is the case […] Continue reading
Posted in centos, fedora, linux, one-liner, rhel, shell, Syndicated, sysadmin, tips & tricks
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[one-liner]: Opening CAD/CAM .dwg/.dxf Files under CentOS/Fedora/RHEL
Background
A co-worker of mine handed me some .dwg & .dxf files which I’d never seen before. Turns out they’re AutoCAD/AutoDesk files, but I had a hard time finding a decent viewer under Linux.
.dwg – a binary file format used for storing two and three dimensional design data and metadata
.dxf – Drawing Interchange Format, or […] Continue reading
Posted in CAD, centos, fedora, one-liner, redhat, rhel, Syndicated, tips & tricks
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[one-liner]: Getting Networking Info from the Command Line using NetworkManager’s nm-tool Command
Background
This is just a quick post to capture a pretty useful networking command line tool, nm-tool, that’s included with NetworkManager.
Solution
nm-tool is really nice in the sense that it takes information from a lot of other command line tools, (such as ifconfig, iwconfig, iwlist, etc.) and integrates it into a single command. For example:
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# output from […] Continue reading
Posted in centos, fedora, networking, one-liner, redhat, rhel, Syndicated, tips & tricks
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[one-liner]: Determining a CD/DVD Drive’s Write Speed Capabilities under Fedora/CentOS/RHEL
Background
Here’s a quick primer on how to determine the capabilities of a CD/DVD drive you may have on your Linux laptop or desktop using the little known command wodim. In truth, wodim is actually the app behind cdrecord & dvdrecord, which are little more than aliases.
NOTE: it’s available as wodim-1.1.11-3.fc14.x86_64 in the default Fedora 14 […] Continue reading
Posted in cd, centos, DVD, fedora, one-liner, performance, redhat, rhel, Syndicated, tips & tricks
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[one-liner]: Archving a Directory Tree into a CD or DVD via the Command Line Using mkisofs on Fedora 14 & CentOS 5
Background
Recently I was putting together a script to build an archive of all the various files that a project was comprised from. One of the final tasks was to burn the entire lot of files to a CD or DVD, so I took the opportunity to figure out how to do this from the command […] Continue reading
Posted in cd, centos, DVD, fedora, one-liner, redhat, rhel, Syndicated, sysadmin, tips & tricks
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[one-liner]: How to Backup a Movie DVD via the Command Line on Fedora 14 & CentOS 5
Background
Have you ever wanted to make a backup copy of a DVD via the command line? I don’t really care about the politics/legal issues around this simple task, I have 3 kids and don’t really feel like purchasing multiple copies of the same discs. So here’s a quick and dirty way to accomplish the […] Continue reading
Posted in centos, DVD, fedora, one-liner, redhat, rhel, Syndicated, tips & tricks
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CentOS RPM Tutorial Part 3 – Building your own RPM of JBoss
Getting Started
In this 3rd instalment of my series on RPM packages I’m going to show an example where I package up a zip file and roll it into an RPM file. For this example I’ll be packaging the Java Application Server, JBoss 4.2.3.GA. NOTE: Refer to my previous posts (part 1 & part 2) regarding […] Continue reading
Posted in centos, linux, package management, rhel, rpm, Syndicated, tutorials
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[one-liner]: Increasing a KVM guest’s Memory on CentOS 5
Background
Recently the need came up to increase the amount of RAM I had allocated to an already running KVM guest VM on a CentOS 5 KVM host. This is a pretty easy task using other virtualization technologies so I assumed, maybe foolishly, that this would be an easy task using KVM too. Looking […] Continue reading
Posted in centos, KVM, one-liner, redhat, rhel, Syndicated, tips & tricks, virtualization
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[one-liner]: How to Change the Hostname on a Fedora/CentOS/RHEL System
Background
Changing your system’s hostname is probably one of the most confusing things to do on a Redhat based Linux system. Turns out there are several ways to do it, part of the reason why it’s so confusing … I guess. Here’s my attempt to capture as many of them that I’m aware of.
Solution
There are essentially […] Continue reading
Posted in centos, fedora, linux, one-liner, redhat, rhel, Syndicated, sysadmin, tips & tricks
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