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Category shell

SSH / Clientconfig – Unknown wrongfully

If you have several Linux servers in your care and are allowed to maintain them, you surely know the problem of different SSH keys for different customers, environments or security aspects. Now of course there are several solutions, one approach… Continue Reading →

Test your bandwidth with dd or/and netcat

If you dont have a iperf on your server and you cannot install it for some reasons my iperf article will not help you to determine your throuphput. But you can check your bandwidth with some other tools. Most of… Continue Reading →

iperf – a great bandwidth measure tool

Today i want to introduce a little bandwith measure tool to you. iperfis a tool to measure the bandwith between to systems. It is a client/server application, so you need to install it on both sides. To install this little… Continue Reading →

DNS Timeouts in DUALSTACK Umgebungen

A few days ago, we had some strengh phenomenon on our Oracle RAC Servern with TNSListener Timeouts. EM Event: Critical:LISTENER_SCAN3_rac-scan – Listener response to a TNS ping is 5,010 msecs After some research and many hours of analysing, we could… Continue Reading →

Zabbix-userparameter – checking the multipathing

Here are some “quick & dirty” working userparameter for Zabbix :), they check: how many paths per device are available, if some of that paths are in a faulty state Number of paths UserParameter=Count.Multipath.Devices, echo $(( $(echo ‘show paths’ |… Continue Reading →

Documentation for multipathd

Documentatuon for MultipathD The multipathd supports the devicemapper with the configuration of the harddrives which are mounted with more than one path. Important Files The configuration file for the multipathd is the following: – /etc/multipath.conf This file holds the configuratipn…… Continue Reading →

Perfomanceanalysing with SAR

Perfomanceanalysing with SAR Installation You need to install the package sysstat to use sar. You also need to configue a cronjob, so sar can collect all the great perfomance data. The package comes with the needed cron-configfiles for sar and… Continue Reading →

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