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Linux Mint 13: Enabling the SD Card Reader on the Toshiba Satellite P870
I started using SD cards recently and had a heck of a time using it on my laptop at first. I tried using my 32 GB SDHC card in the USB adapter, to no avail, then I found the SD slot and it still did not work either. It turned out that the driver was…
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The Possibility of a Friendica-Based Service
An idea came to mind the other day. I was pondering small ventures I could possibly spin up, to make a few dollars and in the process provide something of value for low cost. The possibility of starting a Friendica-based service, wherein a user can start their own SSL-secured self-contained Friendica node, via a web-based…
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Using Friendica as a Content Aggregator
Friendica is a powerful tool, not only for social networking; but also for a variety of other purposes. The usage I would like to discuss today is content aggregation. There are many ways to aggregate content on the web; but Friendica has something that none of the others have. Friendica not only allows you to…
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Toshiba P870: Installing Linux Mint
I have recently started using a Toshiba P870 laptop and decided to install Linux Mint 13 Maya (Cinnamon Edition) on it, due to its ease of use and overall security soundness. Being as the Toshiba P870 is a relatively new laptop, with some components’ drivers not having been included in the installation files of Mint,…
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Appending to a Remote File via SSH
Most LINUX users know how to copy and overwrite a file from one server to another; but it can also be useful to directly append to a file, without having to login to the remote server and make the changes manually. This does not appear to be possible with the commonly used SCP utility; however,…
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Tunneling Through a Remote Firewall Using SSH Commands
If you’re dealing with systems behind a firewall it’s almost inevitable that you will need to tunnel into those systems from time to time. Fortunately, there are some quick & easy commands to accomplish this. In this example, we are going to use a Mac OSX or linux-based system, to gain access to a web…
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Fixing Performance Problems on Your JBoss Web Apps By Diagnosing Blocked Thread Issues
I was once perplexed by a bizarre performance issue, I encountered at seemingly random intervals, in an application I help to maintain. The application kept freezing up, without any log messages to use for diagnosis. This was very frustrating, because it meant the application server typically had to be restarted manually to restore service. After…
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10 Principles to Consider When Evolving Your Web Application’s Front End
It’s very easy, especially for an “evolving” web application, to end up with a user interface that is buggy and difficult to maintain, particularly if you are incrementally making changes to an outdated app, without a full redesign. This is a challenge that I’ve faced on many occasions, as I have often worked on applications…
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Tar/GZip Files in One Operation, Unattached to the Terminal Session
When you’re trying to move a large block of files, its often useful to do so in one command and to be able to close your terminal window (or allow it to time out). If you run a command under normal circumstances, losing the connection can cause your command to terminate prematurely, this is where…
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SSH: DSA Key Issue: Unknown code krb5 195
I was attempting to set up an SSH key between two servers, so I could automatically back up a file from one to the other. This is usually a fairly straightforward and routine procedure; but in this case I had some issues. When I got everything set-up, with the public key in the accepted_keys file…