Add nova::scheduler::filter for managing scheduler.filter

This patch is aim to add a new class to manage the filter
params in nova.scheduler.The most useable params are the
resource allocation ratio options.

Fix bug #1201062

Change-Id: Iab2c76fdd07768471f6bab61aaf8c7eff6445a22

manifests/scheduler/filter.pp

@@ -0,0 +1,92 @@
+# == Class: nova:scheduler::filter
+#
+# This class is aim to configure nova.scheduler filter
+#
+# === Parameters:
+#
+# ==== Options defined in nova.scheduler.driver
+# scheduler_host_manager: The scheduler host manager class to use
+# scheduler_max_attempts: Maximum number of attempts to schedule an instance
+
+# ==== Options defined in nova.scheduler.filter_scheduler
+# scheduler_host_subset_size: defines the subset size that a host is chosen from
+
+# ==== Options defined in nova.scheduler.filters.core_filter
+# cpu_allocation_ratio:   Virtual CPU to Physical CPU allocation ratio (float)
+
+# ==== Options defined in nova.scheduler.filters.disk_filter
+# disk_allocation_ratio:  Virtual disk to physical disk allocation ratio (float)
+
+# ==== Options defined in nova.scheduler.filters.io_ops_filter
+# max_io_ops_per_host:    Ignore hosts that have too many builds/resizes
+#                         /snaps/migrations (Int)
+
+# ==== Options defined in nova.scheduler.filters.isolated_hosts_filter
+# isolated_images: Images to run on isolated host (list value)
+# isolated_hosts:  Host reserved for specific images (list value)
+
+# ==== Options defined in nova.scheduler.filters.num_instances_filter
+# max_instances_per_host: Ignore hosts that have too many instances (Int)
+
+# ==== Options defined in nova.scheduler.filters.ram_filter
+# ram_allocation_ratio:   Virtual ram to physical ram allocation ratio (Int)
+
+# ==== Options defined in nova.scheduler.host_manager
+# scheduler_available_filters
+# scheduler_default_filters
+# scheduler_weight_classes
+#
+class nova::scheduler::filter (
+  $scheduler_host_manager       = 'nova.scheduler.host_manager.HostManager',
+  $scheduler_max_attempts       = '3',
+  $scheduler_host_subset_size   = '1',
+  $cpu_allocation_ratio         = '16.0',
+  $disk_allocation_ratio        = '1.0',
+  $max_io_ops_per_host          = '8',
+  $max_instances_per_host       = '50',
+  $ram_allocation_ratio         = '1.5',
+  $isolated_images              = false,
+  $isolated_hosts               = false,
+  $scheduler_available_filters  = 'nova.scheduler.filters.all_filters',
+  $scheduler_default_filters    = false,
+  $scheduler_weight_classes     = 'nova.scheduler.weights.all_weighers',
+) {
+
+  nova_config {
+    'DEFAULT/scheduler_host_manager':       value => $scheduler_host_manager;
+    'DEFAULT/scheduler_max_attempts':       value => $scheduler_max_attempts;
+    'DEFAULT/scheduler_host_subset_size':   value => $scheduler_host_subset_size;
+    'DEFAULT/cpu_allocation_ratio':         value => $cpu_allocation_ratio;
+    'DEFAULT/disk_allocation_ratio':        value => $disk_allocation_ratio;
+    'DEFAULT/max_io_ops_per_host':          value => $max_io_ops_per_host;
+    'DEFAULT/max_instances_per_host':       value => $max_instances_per_host;
+    'DEFAULT/ram_allocation_ratio':         value => $ram_allocation_ratio;
+    'DEFAULT/scheduler_available_filters':  value => $scheduler_available_filters;
+    'DEFAULT/scheduler_weight_classes':     value => $scheduler_weight_classes
+  }
+  if ($scheduler_default_filters)  {
+    nova_config { 'DEFAULT/scheduler_default_filters':  value => join($scheduler_default_filters,',')
+    }
+  } else {
+    nova_config  { 'DEFAULT/scheduler_default_filters': ensure => absent
+    }
+  }
+  if ($isolated_images) {
+    nova_config {
+      'DEFAULT/isolated_images':    value => join($isolated_images,',')
+    }
+  } else {
+    nova_config {
+      'DEFAULT/isolated_images':   ensure => absent
+    }
+  }
+  if ($isolated_hosts) {
+    nova_config {
+      'DEFAULT/isolated_hosts':    value => join($isolated_hosts,',')
+    }
+  }  else {
+    nova_config {
+      'DEFAULT/isolated_hosts':    ensure => absent
+    }
+  }
+}

spec/classes/nova_scheduler_filter_spec.rb

@@ -0,0 +1,33 @@
+require 'spec_helper'
+
+describe 'nova::scheduler::filter' do
+
+  it { should contain_nova_config('DEFAULT/scheduler_host_manager').with_value('nova.scheduler.host_manager.HostManager') }
+  it { should contain_nova_config('DEFAULT/scheduler_max_attempts').with_value('3') }
+  it { should contain_nova_config('DEFAULT/scheduler_host_subset_size').with_value('1') }
+  it { should contain_nova_config('DEFAULT/cpu_allocation_ratio').with_value('16.0') }
+  it { should contain_nova_config('DEFAULT/disk_allocation_ratio').with_value('1.0') }
+  it { should contain_nova_config('DEFAULT/max_io_ops_per_host').with_value('8') }
+  it { should contain_nova_config('DEFAULT/max_instances_per_host').with_value('50') }
+  it { should contain_nova_config('DEFAULT/ram_allocation_ratio').with_value('1.5') }
+  it { should contain_nova_config('DEFAULT/scheduler_available_filters').with_value('nova.scheduler.filters.all_filters') }
+  it { should contain_nova_config('DEFAULT/scheduler_weight_classes').with_value('nova.scheduler.weights.all_weighers') }
+
+  describe 'when overriding params' do
+
+    let :params do
+      {:scheduler_max_attempts     => '4',
+       :isolated_images            => ['ubuntu1','centos2'],
+       :isolated_hosts             => ['192.168.1.2','192.168.1.3'],
+       :scheduler_default_filters  => ['RetryFilter','AvailabilityZoneFilter','RamFilter']
+      }
+    end
+
+  it { should contain_nova_config('DEFAULT/scheduler_max_attempts').with_value('4') }
+  it { should contain_nova_config('DEFAULT/isolated_images').with_value('ubuntu1,centos2') }
+  it { should contain_nova_config('DEFAULT/isolated_hosts').with_value('192.168.1.2,192.168.1.3') }
+  it { should contain_nova_config('DEFAULT/scheduler_default_filters').with_value('RetryFilter,AvailabilityZoneFilter,RamFilter') }
+
+  end
+
+end