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nginx and the too many open files limit 9 Aug 2013 | 04:14 pm
So, nginx is fast, nginx is light, nginx is great but… nginx can be nasty too, with undocumented unexpected behaviors. What happened today? We were putting in production a new reverse proxy based on n...
Xen, XFS and the barrier error 24 Jul 2013 | 08:12 pm
Probably nobody is going to hit this but since I’ve lost half a morning puzzling my mind about this error, I think it would be useful to blog about it. We have some old Xen machine running Debian Len...
How to remove a port from a port-channel in a Dell PowerConnect switch 15 Mar 2013 | 02:24 pm
This is a “note to self” type post, and basically because Google seems unable to find a direct answer to this simple question. So it’s simple as this # configure (config)# interface ethernet NN (confi...
Monitor NDB memory usage with Nagios 18 Jan 2013 | 10:25 pm
We are planning to put online a MySQL NDB Cluster soon (more on this in another post), and one thing you have to do before putting anything in production is to monitor it for problems. In the case of ...
/etc/hosts and the thousand-characters-long line 21 Dec 2012 | 09:09 pm
This is a self-note in the case I encounter another strange behaviour like this. We were experiencing a strange problem with MySQL and DNS. I was trying to do this: $ mysql -h server.mysql Unknown MyS...
Very slow Hadoop on PowerEdge R815 9 Oct 2012 | 08:29 pm
We have a little internal Hadoop cluster for development and testing, two very powerful Dell PowerEdge R815 with Debian and a bunch of Xen VMs to reproduce a production environment. Problem is that th...
PHP 5.3 max_input_vars and big forms 17 Feb 2012 | 06:29 am
Starting from PHP 5.3.9 there is a brand new php.ini option: max_input_vars. You may read in the PHP documentation about it. But what you don’t probably now is that if you are using the Suhoshin patch...
Apache2: seg fault or similar nasty error detected in the parent process 23 Dec 2011 | 10:20 pm
If you happen to see a message like this seg fault or similar nasty error detected in the parent process when reloading Apache2, and if you’re using PHP5 through mod_php5, then it may be related to ...
HOWTO: install puppet-dashboard on Debian Squeeze 9 Sep 2011 | 01:40 am
This should apply to Ubuntu Server as well (10.10, 11.04) but it’s tested to work 100% on Debian Squeeze 6.0. Puppet Dashboard is a neat piece of software really useful if you ara managing a good num...
esx-halt: shutdown VMWare ESXi from ssh 6 Sep 2011 | 08:53 am
Long time no post – again – I hope this is the last time and I can be a little more prolific :) Anyway today I want to share a little script that I hacked to shutdown an ESXi (with the free license) h...
