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LJDT: RPM Package Verification and Repair



By: ab

April 3, 2009 4:05 pm

Reads: 871

This entry is part 1 of 10 in the series LJDT - Linux Just Does That

What do you do when you inadvertently change permissions on a bunch of files/directories in your filesystem without meaning to? How do you recover? What software do I need to buy to repair all the applications in my system?? It’s time for the first article in the “Linux Just Does That” series.

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Categories: Appliances, Technical Solutions

LJDT: iSCSI for Shared Storage



By: ab

June 23, 2009 4:18 pm

Reads: 336

This entry is part 2 of 10 in the series LJDT - Linux Just Does That

Every day it seems I find something new that Linux Just Does. Last week I finally decided I needed to learn about “shared storage” and started asking the resident experts here, who all pointed me to YaST. Much to my surprise iSCSI is built into YaST and works out of the box with SLES without much more than ten minutes and an understanding of the technology. For the quickest understanding of shared storage I can muster this article is now being created. Hopefully it will be as enlightening to others as this topic was to me.

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Categories: SUSE Linux Enterprise Desktop, Technical Solutions

LJDT: Taking Advantage of Screen



By: ab

July 1, 2009 3:29 pm

Reads: 304

This entry is part 3 of 10 in the series LJDT - Linux Just Does That

Last week I was asked if there was a way to start an application at the command line and later come back to it from somewhere else. Normally in Linux/Unix (*nix) it is possible to ‘background’ a process and then return to it later on but that’s only if you are still in the same session where the process was sent to the background. This is useful to have something run while you do other things but reconnecting to this session cannot be done with just the shell. Thankfully ‘screen’ is on Linux systems by default (all of them I’ve used anyway) and as a result, Linux Just Does That.

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Categories: SUSE Linux Enterprise Desktop, Technical Solutions

LJDT: Installed RPM Size



By: ab

August 21, 2009 2:20 pm

Reads: 186

This entry is part 4 of 10 in the series LJDT - Linux Just Does That

Sometimes I find myself wondering how big an installed RPM’s files really are. Use a simple script to do all of the calculating of file sizes, plus see how to recreate the RPM from the system where the package is installed in the latest addition to Linux Just Does That.

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Categories: SUSE Linux Enterprise Desktop, Technical Solutions

LJDT: Workspaces



By: ab

September 8, 2009 1:54 pm

Reads: 437

This entry is part 5 of 10 in the series LJDT - Linux Just Does That

For a while now I have taken for granted the marvelous functionality commonly referred-to as “workspaces” in the X window system. Anybody using a graphical interface with X already probably has this functionality present by default and in many distributions the feature of multiple workspaces is even enabled by default The idea behind this article is to show how efficiency in the GUI can be improved using this feature and the ease of adopting the technology to suit your needs out of the box, because Linux Just Does That.

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Categories: SUSE Linux Enterprise Desktop, Technical Solutions

LJDT: Base64 Encoding



By: ab

September 28, 2009 4:13 pm

Reads: 357

This entry is part 6 of 10 in the series LJDT - Linux Just Does That

In computing there are two terms which are often confused: encoding and enciphering. One of them, with ‘cipher’ in its name, usually best refers to something that is cryptographically enciphered which means it was mathematically mangled in a fashion that the result, regardless of the input, is fairly random, patternless nonsense to the un-key-assisted eye. The other term refers to simply changing data from one form to another at is basic level. One type of encoding is ‘base64′ encoding, which is used through many areas of computing and can be explained much more-simply than most cryptographic cipher functions (in my opinion). This article is to show how, on many levels, Linux Just Does That.

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Categories: SUSE Linux Enterprise Server, Technical Solutions

LJDT: The ‘watch’ command



By: ab

October 8, 2009 4:27 pm

Reads: 192

This entry is part 7 of 10 in the series LJDT - Linux Just Does That

Do you ever find yourself running a command, pressing the up-arrow, then [Enter], then the up-arrow, then [Enter], then the up-arrow…. this is a great exercise that will get your fingers used to typing random odd key sequences without your eyes paying attention, but otherwise it’s a complete waste of time. A command I have come to love helps me point my OCD tendencies to other pointless tasks while running commands over and over for me. Introducing ‘watch’, because Linux Just Does That.

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Categories: SUSE Linux Enterprise Server, Technical Solutions

LJDT: Reliable Service / Connection Tests; netcat, not ping, is the correct tool



By: ab

July 18, 2013 11:26 am

Reads: 7915

This entry is part 8 of 10 in the series LJDT - Linux Just Does That

Me: “I cannot get to your site.” Helpdesk: “Hmm, let me check. I can ping it, so it must be okay.” Me: “No, pinging has nothing to do with access to the site.” Helpdesk: “No, you’re crazy, I can ping it so it’s your problem. Goodbye.” If you have never had this type of exchange with others, you’re lucky. The fact of the matter is that ‘ping’, while a good (but not 100% even here) tool to determine if traffic can go from one IP to another, is a lousy tool for determining if anything more than layer three is working …

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Categories: SUSE Linux Enterprise, Technical Solutions

LJDT: LDAP Data and Schema Comparisons



By: ab

August 7, 2013 2:53 pm

Reads: 647

This entry is part 9 of 10 in the series LJDT - Linux Just Does That

Have you ever wanted to compare data between eDirectory trees, or schema between servers, or objects between entirely different directories (OpenLDAP and eDirectory, for example)? It should be possible, of course, as both systems are accessible via LDAP. Still, how does one go about doing this kind of comparison? Well, because you are running on the right server or workstation, Linux Just Does That.

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Categories: Open Enterprise Server on SLES, SUSE Linux Enterprise, SUSE Linux Enterprise Server, Technical Solutions

LJDT: KVM, Snapshots, and Disk Resizing



By: ab

October 30, 2013 10:09 am

Reads: 968

This entry is part 10 of 10 in the series LJDT - Linux Just Does That

Have you ever wanted to resize a disk in a VM and wondered how insanely painful that would be? After all, from the old days of platter-based spinning drives in computers (sorry to those of you still living in those days), before SANs with resizable LUNs, file-backed VMs, and other marvels of recent times, disks didn’t magically resize themselves unless it was to get smaller because they were breaking/broken. As a result, OS’s have learned to handle bad sectors by avoiding them, but growing the current, running disk just seems eerie to me every time I want to do it. Apparently I’m old.

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Categories: Free Tools, openSUSE, Server, SUSE Linux Enterprise, SUSE Linux Enterprise Server, Technical Solutions, Virtualization

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