Sep 132014
 

Systemd
Article by Stuart Burns first posted on Openlogic.com

With Red Hat Enterprise Linux 7 released and CentOS version 7 newly unveiled, now is a good time to cover systemd, the replacement for legacy System V (SysV) startup scripts and runlevels. Red Hat-based distributions are migrating to systemd because it provides more efficient ways of managing services and quicker startup times. With systemd there are fewer files to edit, and all the services are compartmentalized and stand separate from each other. This means that should you screw up one config file, it won’t automatically take out other services.

Systemd has been the default system and services manager in Red Hat Fedora since the release of Fedora 15, so it is extensively field-tested. It provides more consistency and troubleshooting ability than SysV – for instance, it will report if a service has failed, is suspended, or is in error. Perhaps the biggest reason for the move to systemd is that it allows multiple services to start up at the same time, in parallel, making machine boot times quicker than they would be with legacy runlevels.

Continue reading »

flattr this!

Oct 042011
 

Cgroups is present in the official Linux kernel 2.6.24 (late 2007), still he’s not much know or used (at least for what i know).
In this article I’ll give you an overview of this powerful Linux tool to control how much CPU, memory, disk I/O or network I/O each process or user can use in your server.

So in short cgroups it’s a feature to limit, account and isolate resource usage (CPU, memory, disk I/O, etc.) of process groups.
Let’s see how.

Continue reading »

flattr this!

Jan 272011
 

tux-rhYesterday I followed the online event Virtual Experience, presented by Red Hat.

The event was presented in 4 main areas :Red Hat Enterprise 6, Cloud Computing, Virtualization and Jboss, for an idea of the sessions available take a look here.

I followed some of the sessions and from what I saw I had the impression that Cloud is the key word (or fashion) that is often repeated even in talks about  other  topics,  RH  surely   is betting a lot there, but  we are still in the early phases and there are enabling technologies, but the solutions must be built ad hoc on your infrastructure.

Continue reading »

flattr this!