S3 Utility

Here is a great tool for working with Amazon S3.  It even has a wide variety of repos available (easier than compiling from source).  s3cmd is very easy to setup.  It is the easiest to work with of all the S3 tools I have used.

http://s3tools.org/s3cmd

Create ssh public key from private key

If you have a private key and want to create the public key from that (to put in ~/.ssh/authorized_keys, for example), do the following:

ssh-keygen -f <my_private_key> -y > <my_public_key>

For example:

ssh-keygen -f ~/.ssh/id_rsa -y > ~/.ssh/id_rsa.pub


If you are using this to ssh with keys, add my_public_key (eg. ~/.ssh/id_rsa.pub) to ~/.ssh/authorized_keys on the remote server.

Then ssh with the private key to the remote server to test.

Ubuntu and EC2

Great blog on the nitty gritty of working with EC2:

http://alestic.com/

DenyHosts setup on Red Hat/Centos/Amazon AMIs

This is a really useful tutorial for setting up DenyHosts to protect against brute force ssh attacks.

http://www.cyberciti.biz/faq/rhel-linux-block-ssh-dictionary-brute-force-attacks/

DenyHosts homepage:

http://denyhosts.sourceforge.net/