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, ...

I just did it, you did it also once and you will do it in the future or if you are on this page because you want to do it right know, its a honor for me to help you with. Setup a mariadb (galera) c...

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 side...

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 ...

To use tools like multipath in zabbix, you have to check the sudo-settings for the zabbixuser. Use visudo to change the permissions for zabbix. Zabbix will not use a Terminal tty, so you should dea...

All configurations needs to be done on every RAC-Node. All shell-outputs are examples. Prerequisites Oratab and Beoratab The following step are essential on every RAC-Instance. cp /etc/oratab /e...

Here are some “quick & dirty” working userparameter for Zabbix :), they check: how many paths per device are available, </li> if some of that paths are in a faulty state</li> ...

… you have to contact a Network Delivery Lead… This week i had to contact a network specialist from a big international company. Magnificent… We can’t reach a destination over their vpn-tunnel. I...

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 co...

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 Af...