Nginx developers have released two patches – one that fixes null pointer reference, gx_http_parse_complex_uri() buffer underflow. Update immediate or your site can be attacked and nginx stopped remotely (so I heard).
Download the latest stable version and recompile the binary. Then run

kill -USR2 nginx_master_pid

Make sure you see new master nginx process running (you will see two master processes), kill the old one:

kill nginx_master_pid

And your site will be safe and screamingly fast once again!

We have been using memcached for quite long time with a very great success. It’s fast, it’s quite easy to use and incorporate in existing code. Furthermore, it’s totally free. Memcached caches value/key pair in RAM, thus giving fast access to it when you require.

Now, if you want to boost performance of your WordPress blog it’s quite easy – get a W3-total-cache plugin, configure it and you are set (remember, you will need a memcached server running otherwise you can’t use memcached “storage” from W3-total-cache plugin).

In our tests it boosted our WordPress blog performance from 20-200%… Read the rest of this entry »

We have been migrating quite a few physical servers to Vsphere infrastructure and I strongly suggest re-installing servers from scratch rather than using Converter to do actual migration. From my experience if you are doing migrating SUSE SLES 10 SP 2 and others, it’s better to install a server (virtual guest OS)  from scratch and do application migration.

You will experience much better performance and no problems with drivers, BIOS 4 to BIOS 7 upgrades and so on.

Yesterday I was trying to hot-clone one production server in Vsphere and got the error:

The operation is not allowed in the current state of the host

Finally, I figured out where was the problem. I had running multiple servers in a HA cluster (with DRS activated) and one of the hosts were in a maintenance mode. This was the problem – I removed the maintenance mode and hot-cloning worked perfectly.