OSSEC is an Open Source Host-based Intrusion Detection System that performs log analysis, file integrity checking, policy monitoring, rootkit detection, real-time alerting and active response. It runs on most operating systems, including Linux, MacOS, Solaris, HP-UX, AIX and OpenBSD. There … Continue reading
IMAP folders are really because you can have your e-mails synchronized on multiple devices, without losing e-mails across your devices when retrieving your new e-mails. IMAP folders actually also aren’t that cool because e-mails are usually never deleted or even … Continue reading
Skytools 2.x compiles perfectly with Postgresql 9.3.5, but when you try to ‘install’ the ticker with the pgqadm.py command, you will receive a strange error. After searching around on the Internet, it seems that when you compile software with Postgresql … Continue reading
The following demonstrates how to create a strict SSL communication between client and server, using HTTP. This setup could used when creating a web API which requires strong encryption and only allows clients which have a properly signed certificate. The … Continue reading
At my recent job, I was asked to create a backup procedure, which would dump a PostgreSQL schema to a compressed file and which was able to create weekly and daily backups. The backups had to be full backups each … Continue reading
Update: This article is updated thanks to Colin Keith his excellent comment. I was extremely inspired by it Maintaining a large number of servers cannot be done without proper programming skills. Each good system administrator must therefor make sure he … Continue reading
Not using indexes or huge tables without indexes, can have a very negative impact on the duration of a SQL query. The query planner will decide to make a sequence scan, which means that the query will go through the … Continue reading
Working on large database systems, with many tables and many indexes, it is easy to loose the overview on what is actually being used and what is just consuming unwanted disk space. If indexes are not closely monitored, they could … Continue reading
Recently I’ve discovered some very interesting new features in the PostgreSQL 9.3 database. First of all, a new data type has been introduced: JSON. Together with this new data type, new functions were also introduced. These new features now simply … Continue reading
Recently I’ve stumbled on a pretty cool OpenSource project called ”datatables” (http://datatables.net/), which allows to easily create tables in HTML that can be: sorted searched paginated scroll infinitely themed … And most important: it’s for free! I’ve always wanted to … Continue reading