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.
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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Multitasking refers to the ability to perform several different activities at the same time in a single Linux computing environment. Many jobs that we perform in our day to day duties when running a Linux system can be performed sequentially, that is, one after the other. Jobs that can be run in a very short amount of time or that require an intense period of resource usage that needs to run as a single large process using all computing resources can be run one after another without the need for multitasking. Jobs that are particularly long running that run on a different computer or several different computers even, such as in a grid environment, are good candidates for multitasking. Defragmenting your disk drive or running a search for a particular query string on your local hard drive are examples of long running local jobs that can be multitasked while running other tasks. Jobs such as long database queries or batch loads onto a remote server are examples of jobs that are controlled in a single session, but can be multitasked in a Linux environment so several of these sessions can be run at the same time.
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Sometimes it’s useful to tell to our GNU/Linux system that we want to keep some packages on Hold or that we do not want to update them , for example you could have added a custom kernel and you don’t want that during an update the standard kernel takes its place, or perhaps you want to test some specific version.
These instructions are tested with distributions that use packages in the .deb format (such as Debian, Ubuntu and Mint), .rpm based distributions that use yum (Red Hat Enterprise, Centos, Fedora) and Gentoo.
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Small news for my readers, one of the game included in one of my article the Top 10 games for Linux in 2012 , is available until the 21 of October in a Indie Bundle, that as usual means that you can get it, and something more, with a very low budget.
To be honest of the 5 games available in this bundle just 2 are ported on Linux, but one of them is Oil Rush that, in my opinion, is worth alone the price of the whole bundle.