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Golang: Determine a device major/minor number 9 May 2013 | 07:16 am
While working on a monitoring agent for a service we will be introducing soon. I needed a way to determine the Major/Minor numbers for a device (e.g. /dev/mapper/datavg-srvlv). It is actually much eas...
Amusing a Sysadmin 18 Apr 2013 | 02:41 am
As most geek discussions go.. we like to push the envelope — to see what is possible! As we discussed using chattr to protect a file from being overwritten, it occurred to me that we might perform a w...
Blocking WordPress Brute Force Attacks against wp-login.php 10 Apr 2013 | 01:39 am
We had a support request recently that indicated a server was under heavy load due to a wordpress wp-login.php brute force login attack. This attack was impacting 3 customer servers from more than 500...
Develop your Puppet Modules Inside of a Sandbox 22 Mar 2012 | 12:08 pm
When you want to develop a new Puppet module, it’s best to work outside of your production environment. You could use Puppet’s built-in environments feature to slice up your site, but there are a hand...
Postfix Dovecot User Admin Script 30 Jan 2012 | 01:27 pm
While working on a postfix/dovecot non-mysql virtual domain configuration, I needed a simple admin script to add new users. The script below is what I came up with after about 30 minutes. I was unable...
Terabytes on a budget – 106TB for $8788 12 Jan 2012 | 10:10 am
When working with a client, we were discussing storage for an application they have developed. Storage price was a key component for success of this product. I read the BackBlaze posts here, and here ...
Two Factor SSH Authentication with Duo Security 14 May 2011 | 03:01 am
As is probably obvious from our blog posts on Yubikey SSH/WordPress two factor authentication and Google Authenticator SSH two factor authentication, we at MNX Solutions are big proponents of multi-fa...
Designing for failure with Amazon Web Services 22 Apr 2011 | 10:17 am
Avoid single points of failure. You can and should assume everything will fail. Start by listing all major points of your architecture, then break it down further, and then maybe one more level. Now r...
Securing SSH and WordPress with two factor authentication 22 Mar 2011 | 02:58 pm
I wrote a post about using Google Authenticator for SSH a month ago. After writing this post, I started looking at other solutions in the space for two factor authentication. Yubikeys are USB based, a...
Safari providing an SSL error “client certificate rejected” when other browsers work 22 Mar 2011 | 01:42 am
If you’re receiving an error message such as: Safari can’t open the page “https://example.com”. The error was: “client certificate rejected” (NSURLErrorDomain:-1205) Please choose Report Bug to Apple ...
