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Category Archives: sysadmin
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[one-liner]: Linux Runlevels
Background
Determining a systems runlevel can be useful when setting up a headless server or determining if a system is being used as a server or as a workstation. Thankfully it’s pretty easy, using a number of commands. But before we get started, a little background.
Runlevels are a concept from UNIX System V used by the […]
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Posted in linux, one-liner, Syndicated, sysadmin, tips & tricks
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How to programmatically determine the highest version kernel RPM installed?
Background
Recently on the StackExchange site Unix & Linux the following question came up which seemed easy enough to answer.
How to programmatically determine the highest version kernel RPM installed?
This turned out to be trickier than I originally thought. What follows is my ultimate answer along with several failed attempts. I leave them so that others can […]
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Posted in centos, fedora, package management, rhel, rpm, Syndicated, sysadmin, tip, tutorials
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Why are “executables” such as reboot, shutdown, and vgscan symlinks in the /sbin directory?
Background
If you’ve ever gone poking around in your Linux system’s /sbin directory the site of files like this might make you scratch your head.
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lrwxrwxrwx 1 root root 3 Jun 7 2011 vgmerge -> lvm
lrwxrwxrwx 1 root root 3 Jun […]
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How is my password stored in Linux?
Background
People that use Linux on a daily basis probably are completely oblivious to the actual mechanisms being used to store their passwords safely and securely on a given Linux system. Oh they might guess that their password is stored in the /etc/passwd file (they’d be wrong by the way) but most probably never even gave […]
Posted in encryption, linux, passwords, Security, SHA-512, shadow, Syndicated, sysadmin, tutorials
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[one-liner]: Why is Conky reporting a lower CPU frequency, when my CPU frequency is actually much higher?
Background
If you’ve every dealt with Conky you may have gotten a little confused when you’re trying to get it to display your CPU frequency like so:
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${freq_g cpu0} Ghz
… and Conky is reporting your CPU frequency as 1.12GHz when in fact it’s actually much higher than that, say 2.67GHz. Most likely this is being caused by […]
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Posted in conky, linux, monitoring, one-liner, performance, Syndicated, sysadmin, tips & tricks
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[one-liner]: Checking out a HDD’s Health using the Command Line Tool udisk
Background
Here’s a quick tip for checking out the overall health of your computer’s hard drive. It makes use of a little known tool called udisks which provides access to information about storage devices from the D-Bus interface.
Solution
Before we jump into udisks here are some resources that might prove useful when dealing with the design/architecture of […]
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Posted in HDD, linux, monitoring, one-liner, performance, Syndicated, sysadmin, tips & tricks
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[one-liner]: Monitoring Network Traffic with Netstat on Linux
Background
This is a quick guide to some not so obvious command-line options available in the Linux netstat(8) command. I hope you enjoy it.
Solution
1. Plain old netstat
Without any command-line arguments, “netstat” shows a list of network connections in your system, including TCP, UDP and UNIX socket connections. If you want to speed up things a bit, […] Continue reading
Posted in linux, monitoring, one-liner, redhat, rhel, Syndicated, sysadmin, tips & tricks
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[one-liner]: Using scp to Copy Files that Contain Spaces
Background
Have you ever needed to copy either a single file or a directory that contains spaces using scp? Here are a couple of techniques for how to do this.
Solution
Here are several ways to accomplish the same thing. Copying a entire directory with spaces and copying a file with spaces using scp.
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# Ways to copy entire […] Continue reading
Posted in bash, one-liner, script, Syndicated, sysadmin, tip, tips & tricks
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[one-liner]: Installing 3rd Party Apps (Java, Skype, MS Fonts, and Codecs) using the app easyLife on Fedora Linux
Background
Never heard of this app before, easyLife, but it purports to simplifying the installation of the extras that you typically will need on your Fedora system, (i.e. Java, Nvidia, Skype, Adobe Flash, Fonts, etc.). It works like other apps have in the past, Automatix & Ultamatix, on Ubuntu, and Fedora Frog just to name a […] Continue reading
Posted in centos, fedora, one-liner, redhat, rhel, Syndicated, sysadmin, tips & tricks
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How to Add a New Hard Drive to a Linux Software RAID (CentOS & Fedora)
Getting Started
A while back I setup a 1TB hard drive for backing up my primary file server. That 1TB drive was setup in a software RAID, a RAID 1 mirror to be exact. However I opted at the time to only add the one drive to the RAID, mainly because I only had just the […] Continue reading
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