If your system is behind a ISA proxy you need to do the following to get yum to work properly. Step one: Download the cntlm rpm package For 64 Bit CentOS 6.x ftp://rpmfind.net/linux/epel/6/x86_64/cntlm-0.35.1-4.el6.x86_64.rpm For 32 Bit CentOS 6.x ftp://rpmfind.net/linux/epel/6/i386/cntlm-0.35.1-4.el6.i686.rpm Step …

how to use yum through ISA proxy using Active Directory account Read more »

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I have had to fix a lot of Linux machines that we have outsourced the hosting on because that the hosting partners Linux specialists can’t set up the system correctly that’s why I am going to do a series of …

Recommended System Swap Space RHEL 6.x / CentOS 6.x / Fedora 6.x Read more »

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Command: hostname explained I have seen a lot of people telling people to use the command hostname to get FQDN but almost none that have explained to junior people what the command actually does more than hostname -f. So I …

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This is a Junior System Administrator how to tutorial to help you download the latest nmap version. The tutorial continues on to a tutorial how to create your own yum repo that part are located here: How to create a …

Download latest nmap from nmap.org to use in local repo how to CentOS 6.x / RHEL 6.x Read more »

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This is an early junior System Administrator guide: This time I will show you how to create a local yum repository that you can use in your environment. First you need to create a directory to host your local yum …

How to create a local yum repo CentOS 6.x / RHEL 6.x Read more »

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This is a Junior Linux System Administrator how-to describing how you use nmap to scan for live devices within a network. Use nmap to scan alive hosts in the network range with the command: nmap -sP subnet/netmask [c-johsor@sesstl168 ~]$ nmap …

How to use nmap to scan the network for live hosts CentOS/RHEL Read more »

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If you like to check if there is updates and what packages that you are able to get updates of you should use the command: sudo yum check-update [c-johsor@sesstl168 ~]$ yum check-update Loaded plugins: fastestmirror, refresh-packagekit, security Determining fastest mirrors …

Yum command: check-update before updating CentOS/RHEL Read more »

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This is how you change the hostname of you CentOS or Red Hat Enterprise host. 1. First check what the current fully qualified domain name is with the command hostname -f hostname -f Result of the command: $ hostname -f …

How to change hostname “FQDN” on CentOS and RHEL Read more »

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Some times I have got an GUI pop-up message that says the following, and asks for the root password at login: authentication is required to set the network proxy used for downloading packages.  An application is attempting to perform an …

Fixing “authentication is required to set the network proxy …” on Redhat/CentOS Read more »

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