vTiger CRM is prepared to authenticate users from LDAP or Active Directory. But this feature massively hidden, as it seems. The following article describes the configuration in detail.

After building a graphite cluster being able to handle a huge amount of metrics, there is some maintenance to be done on it. Updates, config-changes and so on. No problem so far but if there is a need for nearly 100% of uptime, some tricks are necessary.

Graphite is a toolset for distributed metric collection from nearly infinite sources. After some month of beta-testing graphite we decided to make it the backend for a new monitoring architecture, measuring nearly everything but alarming only on some of the metrics. This prevents redundant data gathering and enables to do really nice stuff like self-learning anomaly detection on this huge amount of metrics.

If you need to have a private alternative to hosted-services like dropbox, there are several solutions getting into place. After testing nearly all of them, I would say that TeamDrive is the best for my purpose.

Sometimes packets leave their line or get lost passing an iptables firewall. Even if you know what you do, there might be a typo or a single mistake in you iptables rules, driving you crazy. As I had to learn…

IO Performance measurement with bonnie++ To have a look at the performance, your storage devices has, bonnie++ is quite well. To write a file of 16 GB and see how fast it is, just do: sudo yum install bonnie++ cd…