script

Backup script for Drupal using Drush and Cron

This is something I have been meaning to write up for a while: how to automate backups using cron and Drush, a commandline tool for Drupal. Drush makes creating backups of your Drupal website's database and files really easy, and I have written a script that calls Drush to create a backup, and then manages your existing backups so you don't use up too much space on your drive. Once a month, it will also create an encrypted copy of that day's backup file and email it to an external email address.

Personally, I think that daily backups from a month ago aren't useful to me any more - if I was going to revert to a backup from that long ago, I'd be looking to restore a weekly backup. Similarly, after several months, I'd only be interested in monthly backups. After creating your daily backup, the script runs through the other files in the backup directory and deletes the files you don't need any more. The script will keep:

  • One week of daily backups
  • One month of weekly backups (1st, 8th, 15th and 22nd)
  • Monthly backups for one year
  • Yearly backups for ever

Before I wrote the script, samhobbs.co.uk was a WordPress site hosted on a Raspberry Pi until the drive I was using bricked. I didn't have a recent backup so I lost the lot. Now I make backups to an external hard drive, so that if the SSD in the my Intel NUC gets corrupted I'll be able to recover. The encrypted copies sent to an external email address protect against the server being stolen or lost in a fire.

Apache ModSecurity Whitelist Generator Script

ModSecurity Logo

This script has been superseded by a commandline utility. Please visit this page for more information

ModSecurity is a Web Application Firewall for Apache. It can monitor all of the traffic that is seen by your web server, including request headers and GET and POST data, and block dodgy requests. ModSecurity itself is actually just a rule engine; the clever part is in the rules you pass to it. Many people use the Open Web Appplication Security Project's (OWASP) Core Rule Set (CRS), an open source set of rules that ModSecurity can use to sift the wheat from the chaff, and foil some common types of attack.

The CRS was written by studying known vulnerabilities and writing rules that would not only have prevented the attacks, but prevented other similar attacks too. Thus, ModSecurity provides a good all-round protection for your web server.

Fix for Ethernet Connection Drop on Raspberry Pi

Raspberry_Pi_Ethernet_Port.jpg

The Problem

Today an engineer from BT was fiddling with the junction box outside my house, and my modem dropped connection to my router.

At the time, the router did not automatically force reconnect (my fault, I hadn’t configured it to do so). When I noticed what had happened, I reconnected to the modem. So far so good.

A couple of hours later, I noticed that two of my three Pi (all of which are connected with ethernet cables) had not reconnected to the router. The one that did reconnect is running Raspbmc (XBMC port to Raspberry Pi); the two that did not are running Apache with some bits on top (a mail server, owncloud, and wordpress for this website!).

This is a pain because not only did it take the services offline, but I was unable to SSH to the Pi to correct the problem. Removing and reconnecting the ethernet cables did not work, so in the end I had to pull the power and reboot.

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