on EL7 there is now mariadb

manifests/client/base.pp

@@ -1,7 +1,13 @@
 # basic mysql client stuff
 class mysql::client::base {
   package { 'mysql':
-    ensure  => present,
-    alias   => 'mysql-client',
+    ensure => present,
+    alias  => 'mysql-client',
+  }
+  if $::operatingsystem in ['RedHat', 'CentOS'] and
+    $::operatingsystemmajrelease > 6 {
+      Package[mysql]{
+        name => 'mariadb'
+      }
   }
 }

manifests/server/centos.pp

@@ -1,7 +1,16 @@
 # centos specific things
 class mysql::server::centos inherits mysql::server::clientpackage {
-  Service['mysql']{
-    name  => 'mysqld',
+  if $::operatingsystemmajrelease > 6 {
+    Package['mysql-server']{
+      name  => 'mariadb-server',
+    }
+    Service['mysql']{
+      name  => 'mariadb',
+    }
+  } else {
+    Service['mysql']{
+      name  => 'mysqld',
+    }
   }
   File['mysql_main_cnf']{
     path => '/etc/my.cnf',