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grabbing a snapshot of the virtualization host, thus supporting backups of the running machine without a maintenance time slot. In other cases, the backup can be created directly in storage, without needing ... Seven leading and popular backup solutions line up to face the Linux Technical Review test team, whose members have checked nearly 100 individual features in a comparative test. ... Test Run

to use the stress [2] tool to put arbitrary memory pressure on your test system. The next natural question is: What happens when memory runs out? That is, running applications are attempting to use more ... What happens when RAM runs out?

In issue 9, I talked about swap memory and how it should be used as a buffer to protect your servers from running out of memory [1]. Swapping is nearly always detrimental to performance, but its ... As RAM runs out, the OOM Killer springs into action.

The modern way to boost run-time performance of Python programs is to leverage the run-time parallelism provided by modern multicore machines along with the SMP-enabled operating systems. Thus ... Overcome the Global Interpreter Lock in Python and take advantage of run-time parallelism on multicore machines.

Many years ago I remember somebody mentioning that rather than running a firewall, they were just using TCP Wrappers. This piqued my interest, because all my customers talked about when it came ... TCP Wrappers are versatile, sophisticated, and surprisingly easy to use, and they can secure your servers from attack with run-time ACL reconfiguration.

a for loop to open an SSH connection to each of the servers and running the update command is a quick workaround: # for i in `seq 1 10`; do ssh www$i update httpd; done If the administrative SSH key ... Running a handful of commands on a large number of systems is a classic admin problem. Func gives administrators a useful alternative to loops and SSH connections.

is comparatively unproblematic, but if you freeze the kernel itself, you don't have a run-time environment that accepts keyboard input, outputs data to the monitor, accesses memory content, or continues running ... Debugging the kernel of a running operating system has always been tricky, but now the Qemu emulator supports cross-platform kernel and module debugging at the programming language level.

or other services that depend on Active Directory (e.g., when accessing mailboxes or sending messages), often they are caused by a problem in Active Directory or DNS. Thus, you will want to run diagnostics ... Performance can be a problem if you run additional services like Sharepoint, Exchange, or SQL on a Windows server. Luckily, the Windows tools described here can help administrators identify

running a setup program or installing a package on the system. VirtualBox does not place heavy demands on the hardware; it does not require Intel VTX/AMD-V or a special Linux kernel, although it still ... VirtualBox is a popular virtualization choice on the desktop. In this article, we show how you can also run VirtualBox on a Linux server – with all the comforts of a graphical user interface.

). Figure 1: The hardware setup for redundant ESX server connections. A sophisticated network concept is a must-have for running an ESX farm. One option is a redundant network connection using two ... running VMware ESX.