EPEL (
Extra
Packages for Enterprise Linux ) is maintained as
part of the Fedora project that maintains several packages that are not part of
the standard Red Hat Enterprise Linux (or CentOS).
For example, if you are installing nagios (or bugzilla, or
any other standard open source software), you’ll typically install it from
source. i.e You’ll download the source code from the corresponding open source
project site, and compile it on your system. You won’t be able to install those
using the standard yum repositories (i.e base, updates, etc.).
If you enable EPEL, you can install nagios, or bugzilla, or
any other standard open source software just using yum command.
The following yum command displays all the repositories
available on your system. As you see below, it has three CentOS-6 repositories
(base, extras and updates). This doesn’t have EPEL enabled yet.
# yum repolist
repo id repo
name status
base
CentOS-6 - Base 6,294
extras
CentOS-6 - Extras 4
updates CentOS-6
- Updates 830
repolist: 7,128
Enable EPEL
First, you need to enable EPEL repository on your system.
You don’t need to configure this repository manually in your yum. Instead,
download the following package and install it, which will enable the EPEL
repository on your system.
epel-release-6-6.noarch – Install this on your RHEL 6 (or
CentOS 6)
epel-release-5-4.noarch - Install this on your RHEL 5 (or
CentOS 5)
On my CentOS 6 system, I did the following. If you just do a
“–test”, to test the installation, this will give NOKEY found warning message.
# rpm -ivh epel-release-6-5.noarch.rpm --test
warning: epel-release-6-5.noarch.rpm: Header V3 RSA/SHA256
Signature, key ID 0608b895: NOKEY
Preparing...
########################################### [100%]
You should download the GPG key for EPEL repository from
fedoraproject and install it on your system as shown below. For CentOS 6, go to
fedoraprojecthttps://fedoraproject.org/keys, and scroll down to
RPM-GPG-KEY-EPEL-6 and download it (or) use the direct wget as shown below.
#
cd
#
wget https://fedoraproject.org/static/0608B895.txt
#
mv 0608B895.txt /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6
#
rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6
Verify that the key got installed successfully.
# rpm -qa gpg*
gpg-pubkey-0608b895-4bd22942
Now install the epel-release-6-6.noarch package, which will
enable EPEL repository on your system.
# rpm -ivh epel-release-6-5.noarch.rpm
Preparing...
########################################### [100%]
1:epel-release-6-5.noarch###########################################
[100%]
GPG Key ID
As you see from the above rpm command, it says “key ID
0608b895: NOKEY”. This indicates that this is looking for the GPG key with id
0608b895.
When you downloaded the key from fedoraproject, notice that
the GPG key is stored in a filename that is just the keyid. As you see from
above, we downloaded 0608B895.txt from fedoraproject website.
Once you’ve installed the key, if you do “rpm -qa gpg*”,
you’ll see that the gpg key with the keyid 0608b895 is installed.
The key id 0608b895 is part of the gpg package name as shown
below.
# rpm -qa gpg*
gpg-pubkey-0608b895-4bd22942
Verify EPEL
Verify that the EPEL repository is enabled as shown below.
Now, you’ll see epel repository (apart from the standard base, updates and
extras repositories).
# yum repolist
repo id repo
name
status
base CentOS-6
- Base
6,294
epel Extra
Packages for Enterprise Linux 6 - x86_64
7,345
extras CentOS-6
- Extras
4
updates CentOS-6
- Updates
928
repolist: 14,571
Finally, you should be able to install lot of standard open
source software (For example, nagios, bugzilla, etc.) directly using yum. Now
if you do ‘yum info nagios’, it will show the following information. Check the
line that starts with “Repo”, which has the value of “epel”, which indicates
that this package is from epel repository.
# yum info nagios
Available Packages
Name : nagios
Arch : x86_64
Version : 3.3.1
Release : 3.el6
Size : 1.1 M
Repo : epel
Summary : Nagios
monitors hosts and services and yells if somethings breaks
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