Randomize time of execution for optimize script.

By default, time will be between midnight and 7:00 any day of the week.

The values are currently hard-coded. This can have serious I/O
repercussions on a server with multiple VMs that run mysql since they
will all run their optimizations simultaneously.

manifests/server.pp

@@ -8,6 +8,9 @@ class mysql::server (
   $nagios_password_hash = 'absent',
   $backup_cron          = false,
   $optimize_cron        = false,
+  $optimize_hour        = fqdn_rand(7),
+  $optimize_minute      = fqdn_rand(60),
+  $optimize_day         = fqdn_rand(7),
   $backup_dir           = '/var/backups/mysql',
   $manage_backup_dir    = true,
   $nagios_notcp         = false

manifests/server/base.pp

@@ -70,7 +70,11 @@ class mysql::server::base {
   }
 
   if $mysql::server::optimize_cron {
-    include mysql::server::cron::optimize
+    class { 'mysql::server::cron::optimize':
+      optimize_hour   => $mysql::server::optimize_hour,
+      optimize_minute => $mysql::server::optimize_minute,
+      optimize_day    => $mysql::server::optimize_day,
+    }
   }
 
   service { 'mysql':

manifests/server/cron/optimize.pp

@@ -1,5 +1,9 @@
 # optimize mysql databases regurarely
-class mysql::server::cron::optimize {
+class mysql::server::cron::optimize (
+  $optimize_hour,
+  $optimize_minute,
+  $optimize_day
+) {
 
   file { 'mysql_optimize_script':
     path    => '/usr/local/sbin/optimize_mysql_tables.rb',
@@ -12,9 +16,9 @@ class mysql::server::cron::optimize {
   cron { 'mysql_optimize_cron':
     command => '/usr/local/sbin/optimize_mysql_tables.rb',
     user    => 'root',
-    minute  => 40,
+    minute  => $optimize_minute,
-    hour    => 6,
+    hour    => $optimize_hour,
-    weekday => 7,
+    weekday => $optimize_day,
     require => [  Exec['mysql_set_rootpw'],
                   File['mysql_root_cnf'],
                   File['mysql_optimize_script'] ],