Chef-client 401 "Unauthorized"

If you get this : Net::HTTPServerException: 401 "Unauthorized"
when running chef-client, you need to verify that you have the fqdn / node name (node_name) in your client configuration.

Chef bootstrap - public key failure

I tried running chef bootstrap using public key on amazon ec2 server, and get some errors:
    ERROR: ArgumentError: invalid option(s): keys_only
Or
   /usr/lib/ruby/1.8/net/ssh.rb:155:in `start': invalid option(s): keys_only (ArgumentError)
well, i don't know if it is a bug, but i create a simple solution for this with a simple script
the following script will allow password, run bootstrap and disallow password

Nagios with graphs installation (step by step)

Did you ever wanted to have alerting system (such as Nagios) and add some graphs

you can find here a short post, with a full description of adding graphs to Nagios

I also add configuration example

EC2 security access when working with ELB

As you know /or not, when working with ELB the security group on the Amazon ec2 instances will not catch the real IP, only the internal ELB ip.

So, how can we prevent this Security hole?

EC2 Instance backup - auto backup for prod

Did you ever wonder how to automatically create a backup to only your prod (or some other) environment on Amazon ec2?

Well this is easy, all you need to do is to add a tag to the instances and set a cron job.

Copy the following script to your manage machine and replace the EC2 certs path ….. with your