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Shrink EBS Root

Posted on November 21, 2011 by cyberx86
28

My EC2 instances are setup to have only the operating system and program files on the root volume, with all other data (logs, mail, etc.) on a second EBS volume. This leads to a very stable root volume, which sees … Continue reading →

Posted in: Systems Admin Tagged: Elastic Block Store, resize

Capturing Termination Signals in PHP

Posted on November 18, 2011 by cyberx86
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Consider the scenario of a PHP script which can be run for a period of time, stopped, and continue its task later on. A common necessity for such a script may be to detect when the script is terminated, and … Continue reading →

Posted in: Code Snippets Tagged: php, signals

Installing ApacheBench without Apache on Amazon’s Linux

Posted on November 18, 2011 by cyberx86
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Having recently switched to a setup with only nginx (and no apache), I found myself wanting to run some tests. As nice as siege is, I rather like ApacheBench (ab). However, I really didn’t want to install all of Apache … Continue reading →

Posted in: Systems Admin Tagged: ab, cpio, rpm

Producing Hydrogen Gas using Sodium Hydroxide and Aluminum

Posted on November 18, 2011 by cyberx86
10

One of my favourite chemistry demonstrations is the combustion of hydrogen in a balloon. It has all the qualities desirable in a flashy experiment, and the actual execution is exceptionally easy – the difficulty, however, comes down to obtaining the … Continue reading →

Posted in: Chemistry Tagged: demonstration, hydrogen, lab

Connect to Amazon’s Linux via WinSCP as root

Posted on October 5, 2011 by cyberx86
3

SCP offers a number of advantages over FTP, not the least of which include no setup (you don’t need an FTP server) and increased security. However, when setting up a server, it can be rather inconvenient to be unable to … Continue reading →

Posted in: Systems Admin Tagged: aws, scp

Building an Nginx RPM on Amazon’s Linux

Posted on October 2, 2011 by cyberx86
1

If no customizations are desired, a far simpler way to get the RPM, than that outlined below, is to use the nginx repository, available from nginx’s download page. After deciding to change my server stack today (based on Amazon’s Linux), … Continue reading →

Posted in: Systems Admin Tagged: aws, nginx

Physical Activity Ratios

Posted on September 12, 2011 by cyberx86
5

Having recently been asked about calorie usage, and following an unsuccessful online search for a table of PAR values, I have reproduced, below, one I had in my physiology notes from a few years ago. Using PAR allows a much … Continue reading →

Posted in: Biology Tagged: metabolism, nutrition

PHP-FPM on Amazon’s Linux

Posted on July 4, 2011 by cyberx86
4

Update (Oct 1, 2011): The release notes for the newest version of Amazon’s Linux (2011.09) state that “PHP scripts have the option of using PHP-FPM.” PHP-FPM is now included in the amzn-main repository, and can be installed via yum install … Continue reading →

Posted in: Systems Admin Tagged: aws, fastcgi, php, php-fpm, rpmbuild

Installing Heartbeat on Amazon’s EC2

Posted on July 3, 2011 by cyberx86
18

I am currently working on setting up a small high availability server cluster on Amazon’s EC2 cloud. Such a setup requires several underlying technologies to work together. Common among these are a distributed file system, a load balancer, and some … Continue reading →

Posted in: Cluster Tagged: aws, cluster, EC2, heartbeat

Rotating EBS Snapshots: ec2-prune-snapshots

Posted on June 27, 2011 by cyberx86
138

Following the significant disruption of EBS volumes in April, the importance of backups was once again brought to the forefront. Amazon’s method of generating EBS backups is the ‘snapshot’ – a differential backup stored in S3. While Amazon provides tools … Continue reading →

Posted in: Software, Systems Admin Tagged: aws, backup, ec2-prune-snapshots, Elastic Block Store, perl

VirtualStore – A few more hidden files

Posted on June 21, 2011 by cyberx86
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Having not used Windows 7 much (and having skipped over Vista), I was rather surprised to discover that I was unable to locate files that were saved by a particular program. In this case, the program saved the files in … Continue reading →

Posted in: Computers Tagged: security, virtualization, windows

Generating a pure-ftpd RPM for Amazon’s Linux

Posted on June 6, 2011 by cyberx86
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The only ftp server the amzn repository has is vsftpd. While, as the name suggests, vsftpd is supposed to be ‘very secure’ many other ftp servers have a comparable track record for security. Of these, pure-ftpd is easily configured and … Continue reading →

Posted in: Systems Admin Tagged: compile, ftp, rpmbuild

ec2-consistent-snapshot on Amazon’s Linux AMI

Posted on May 24, 2011 by cyberx86
5

Update: the complementary article to this one, on Rotating EBS snapshots has now been posted. After the recent failure of EBS volumes on Amazon’s cloud, backup is quite likely something to be considering. If, during the aforementioned incident, recent snapshots … Continue reading →

Posted in: Systems Admin Tagged: aws, backup, cpan, cron, EC2, Elastic Block Store, perl

DKIM/Domainkeys signing via DKIMproxy

Posted on May 14, 2011 by cyberx86
2

With the ever increasing volume of SPAM being transmitted, many email services look toward more elaborate ways to authenticate email. Beyond the obvious – content – two commonly used methods (perhaps with some variations), include sender policy framework (SPF), and … Continue reading →

Posted in: Systems Admin Tagged: dkim, domainkeys, email, postfix, spam

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