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.

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Nov 232012
 

In the past I’ve published some info to enhance the security of your ssh server such as 3 easy steps to strengthen your ssh server or how to use SSH for more secure browsing in public networks, today we’ll take a look at the PAM modules of GNU/Linux and in particular the module ssh and at some options that we can activate to strengthen our ssh server.

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Nov 102012
 

In a previous post we’ve seen how to Enable automatic security update in Debian/Ubuntu, I use it on my Debian VPS and I must say that I’ve forgot to be worried about security updates thanks to this, but perhaps you have a Red Hat 6 or Centos 6 and you want to sleep well as well ?

There is no problem, today we’ll see how to achieve the same result on a Centos 6 machine.
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Secure Boot: Red Hat and Canonical present their alternatives

Original article by Paul Castagnino, first published on usemoslinux.blogspot.it in spanish Secure Boot is a type of mechanism that verifies that the code executed is digitally signed. Thus the computer can only boot an operating system that has a bootloader properly signed. This is a requirement that Microsoft asked to put on computers the badge “Windows 8 […]

Email on shutdown and restart (Linux)

For a customer i was in need of a quick way to send an email every time his system (centos) stop, reboot or simply boot. I’ve found an useful article http://www.syntaxtechnology.com and most of this article is based on that. To get an email at both start up and shut down we need to write […]