diff -r a2342f26c9de -r b0b56e0f8c7f dev/provisioning/modules/yum/README.md
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+# Puppet yum module
+
+This module provides helpful definitions for dealing with *yum*.
+
+### Requirements
+
+Module has been tested on:
+
+* Puppet 3.7.x
+* CentOS 6, 7
+
+# Usage
+
+### yum
+
+Manage main Yum configuration.
+
+```puppet
+class { 'yum':
+  keepcache         => false|true,
+  debuglevel        => number,
+  exactarch         => false|true,
+  obsoletes         => false|true,
+  gpgcheck          => false|true,
+  installonly_limit => number,
+  keep_kernel_devel => false|true,
+}
+```
+
+If `installonly_limit` is changed, purging of old kernel packages is triggered.
+
+### yum::config
+
+Manage yum.conf.
+
+```puppet
+yum::config { 'installonly_limit':
+  ensure => 2,
+}
+
+yum::config { 'debuglevel':
+  ensure => absent,
+}
+```
+
+### yum::gpgkey
+
+Import/remove GPG RPM signing key.
+
+Key defined in recipe (inline):
+
+```puppet
+yum::gpgkey { '/etc/pki/rpm-gpg/RPM-GPG-KEY-puppet-smoketest1':
+  ensure  => present,
+  content => '-----BEGIN PGP PUBLIC KEY BLOCK-----
+...
+-----END PGP PUBLIC KEY BLOCK-----',
+}
+```
+
+Key stored on Puppet fileserver:
+
+```puppet
+yum::gpgkey { '/etc/pki/rpm-gpg/RPM-GPG-KEY-elrepo.org':
+  ensure => present,
+  source => 'puppet:///modules/elrepo/RPM-GPG-KEY-elrepo.org',
+}
+```
+
+### yum::plugin
+
+Install or remove *yum* plugin:
+
+```puppet
+yum::plugin { 'versionlock':
+  ensure => present,
+}
+```
+
+### yum::versionlock
+
+Locks explicitly specified packages from updates. Package name must
+be precisely specified in format *`EPOCH:NAME-VERSION-RELEASE.ARCH`*.
+Wild card in package name is allowed or automatically appended,
+but be careful and always first check on target machine if your
+package is matched correctly! Following definitions create same
+configuration lines:
+
+```puppet
+yum::versionlock { '0:bash-4.1.2-9.el6_2.*':
+  ensure => present,
+}
+
+yum::versionlock { '0:bash-4.1.2-9.el6_2.':
+  ensure => present,
+}
+```
+
+Correct name for installed package can be easily get by running e.g.:
+
+```bash
+$ rpm -q bash --qf '%|EPOCH?{%{EPOCH}}:{0}|:%{NAME}-%{VERSION}-%{RELEASE}.%{ARCH}\n'
+0:bash-4.2.45-5.el7_0.4.x86_64
+```
+
+### yum::group
+
+Install or remove *yum* package group:
+
+```puppet
+yum::group { 'X Window System':
+  ensure => present,
+}
+```
+
+***
+
+CERIT Scientific Cloud, <support@cerit-sc.cz>