This article describes how to monitor amavis for fault and performance.
If you operate an application, you have to monitor it. You want to be the first one to know when things go wrong. You also want to know how well your application performs. That is why you …
Here is a small experimental XYMON client script for checking maildomains validation via DANE.
The script requires Viktor Dukhovnies tool posttls-finger to test DANE enabled servers. posttls-finger comes with Postfix 2.11.x, but it might not always be bundled with your distribution, since it has been marked expermental. This …
Continue readingEs lohnt sich immer, im Frühling nach Südtirol zu fahren. Ein Grund mehr ist die Open Source System Management Conference, die Würth-Phönix traditionell zu dieser Jahreszeit ausrichtet. Der Hersteller von neteye schafft es immer, interessante Redner einzuladen. Dieses Mal lag der Schwerpunkt des Nachmittagsprogramms …
In the article I will describe how the monitor a pacemaker cluster resource manager of a Linux cluster with the OpenNMS monitoring system. The OpenNMS server requests and analyses data from the SNMP agent of pacemaker.
The most important parameters of a pacemaker …
In the article I will describe how the monitor a pacemaker cluster resource manager of a Linux cluster with the Zabbix monitoring system. The Zabbix server requests and analyses data from the SNMP agent pacemaker.
Based on the MIB for the Linux Cluster …
Wer Mailserver betreibt, über die sensible Daten ausgetauscht werden, möchte bei Brute Force Attacken alarmiert werden. Hier eine kurze Beschreibung, wie man das mit XYMON einrichtet.
Postfix loggt über rsyslog. Auf einem Ubuntu-Server findet sich die rsyslog-Konfiguration in /etc/rsyslog.d/50-default.conf. Eine typische Filterung für rsyslog nach SASL …
Continue readingHave you ever asked yourself what bonnie++, the disk performance measurement tool, does in the background while you stare at the command line? I monitored one cycle of bonnie++ and got nice graphs that I want to discuss in this blog.
When it comes to judge storage systems …
Monitoring LOG for abnormal events is daily business as well as tracking normal events - they give a good insight how a system performs. But what makes an event normal and when does it turn into something abnormal?
In order to define what's normal you need to measure and define your …
Continue readingA customer has several WAN lines to remote offices and has QoS implemented on the routers. Of course I wanted to monitor what really happens on the line. Which packets are classified? And how? How many packets are queued and how many bytes are dropped. And the customer was interested …
Continue readingMonitoring all equipment you operate is always a good idea. Especially a mail gateway is still a senstivce application in every company. You want to know what it is doing all the day and you want to be the first one to know if it …