How To: Use yum behind proxy

I've got a few RedHat and CentOS VMs running on internal network of my server, and since updating them quite regularly is a habit I thought this little piece of advice will help all of you who run VMs in a similar scenario.

To make yum command use proxy, your best best is to edit /etc/yum.conf and add your proxy server reference:

proxy=http://192.168.3.1:3128

You don't have to restart anything but it may be a good idea to do yum clean all and then yum check-update:

[root@testvm1 ~]# yum check-update
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: be.mirror.eurid.eu
* epel: epel.uni-oldenburg.de
* extras: be.mirror.eurid.eu
* updates: centosa5-msync-dvd.centos.org
base                                         | 3.7 kB 00:00
base/primary_db                              | 4.5 MB 00:01
cr                                           | 3.0 kB 00:00
cr/primary_db                                | 1.2 kB 00:00
epel                                         | 3.4 kB 00:00
epel/primary_db                              | 3.7 MB 00:00
extras                                       | 3.5 kB 00:00
extras/primary_db                            | 6.3 kB 00:00
updates                                      | 3.5 kB 00:00
updates/primary_db                           | 1.8 MB 00:01

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