Ever have this problem? You just rebuilt a machine, and when you go to SSH into it, you get the following message: @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! Many people just go edit their ~/.ssh/known_hosts file and carry on. But there is a faster/better way! OpenSSH comes with a command called ssh-keygen that allows you to generate and manage all your keys, including your ssh fingerprints.

One of the big problems with hosting your own database solution is that you have to do backups for it on a regular basis. Not only do you need to do backups for it, but you need to also keep backups offsite. Luckily, Amazon S3 allows a cheap and easy solution for your offsite backups. I found a shell script solution for handling MongoDB backups, but it only does local backups.

After doing some crypto updates to a django application that I am working on, I discovered that the Facebook API was dog slow for retrieving any query using HTTPS. Turns out that the M2Crypto library apparently hijacks the SSL processing of urllib and mucks everything up. Thanks to this handy blog post, I was able to fix my Python implementation of the Facebook API and get things speeding along again.