VMware and Citrix are peers in the market for virtualized standard servers. The two global players recently introduced new versions to keep their opponents on their toes. In this article, we compare the two products and evaluate the high-availability and monitoring strategies.
Nagios might be the best known free monitoring tool, but Zabbix has steadily gained ground over the years and is now set to challenge the market leader. In this article, we look at basic Zabbix functionality and introduce you to items, triggers, and actions.
As a replacement for the legacy System V init, Upstart has abandoned many concepts: Instead of runlevels, Upstart has jobs and events, and its ability to start services in parallel considerably accelerates the boot process. Yet, configuration is almost child's play.
With the command-line tool virsh, a part of the libvirt library, you can query virtual machines to discover their state of health, launch or shut down virtual machines, and perform other tasks – all of which can be conveniently scripted.
Cl uster filesystems such as GFS2 and OCFS2 allow many clients simultaneous access to a storage device. Along with DRBD and Pacemaker, this offers a low-budget option for creating a redundant service – but you need to watch out for a couple of pitfalls.
Fixed partitions on a Linux system can be created easily using tools such as fdisk, but the assignments tend to be wrong or the partitions too small at the worst possible moment. LVM requires slightly more effort at install time, but it soon pays dividends.
The latest gadget lies temptingly on the table in front of you, but it doesn't work with the Linux distribution you are currently using. What now? This month's Admin Story is all about modifying standard Linux packages.