Munin is a great resource monitoring tool that is simple to install and configure. It shows data in form of graphs, which once you’ve learned to interpret often allow you to pinpoint an issue in one instant. Among other things, we use Munin to monitor the disk usage on servers storing backups of a few […]
Let’s imagine that you are using Nagios/Centreon to monitor your systems and you need an advanced tool to scan your logfiles. Your logfiles have a custom format timestamp and contain several fields, separated by spaces. You would like to know the number of log lines matching a certain string, but perform the search in a […]
It is a good idea to periodically change passwords on your system, especially if you’ve the feeling that they have been shared too much around. Here we’ll see the correct way to change the MySQL password for the cmon or root user in a database cluster managed by ClusterControl. There’s a script available to change […]
We’ve been testing ClusterControl with three Percona XtraDB Cluster nodes on a virtualized environment and found it to be pretty resilient to faults. Even after performing a brutal shutdown of all VMs (which is equivalent to pulling the plug on a physical machine) or wiping out the MySQL database on one of the nodes, the […]
Introduction In this post, we introduce vmcreate, our Python script for automating the creation of oVirt and RHEV virtual machines. This script has three purposes: to automate the creation of VMs with an easy to use command line interface to implement constraints on the provisioning of VMs to demonstrate the use of the oVirt Python […]
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