diff --git a/resources/celerity/map.php b/resources/celerity/map.php
--- a/resources/celerity/map.php
+++ b/resources/celerity/map.php
@@ -7,7 +7,7 @@
  */
 return array(
   'names' => array(
-    'core.pkg.css' => 'aced76a5',
+    'core.pkg.css' => '203c9d69',
     'core.pkg.js' => 'a590b451',
     'darkconsole.pkg.js' => 'e7393ebb',
     'differential.pkg.css' => '2de124c9',
@@ -129,7 +129,7 @@
     'rsrc/css/phui/phui-document.css' => '0267054b',
     'rsrc/css/phui/phui-feed-story.css' => 'b7b26d23',
     'rsrc/css/phui/phui-fontkit.css' => 'cb8ae7ad',
-    'rsrc/css/phui/phui-form-view.css' => '621b21c5',
+    'rsrc/css/phui/phui-form-view.css' => '07bafa88',
     'rsrc/css/phui/phui-form.css' => 'afdb2c6e',
     'rsrc/css/phui/phui-header-view.css' => '55bb32dd',
     'rsrc/css/phui/phui-icon.css' => 'b0a6b1b6',
@@ -782,7 +782,7 @@
     'phui-font-icon-base-css' => '3dad2ae3',
     'phui-fontkit-css' => 'cb8ae7ad',
     'phui-form-css' => 'afdb2c6e',
-    'phui-form-view-css' => '621b21c5',
+    'phui-form-view-css' => '07bafa88',
     'phui-header-view-css' => '55bb32dd',
     'phui-icon-view-css' => 'b0a6b1b6',
     'phui-image-mask-css' => '5a8b09c8',
diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -816,6 +816,8 @@
     'DrydockConstants' => 'applications/drydock/constants/DrydockConstants.php',
     'DrydockController' => 'applications/drydock/controller/DrydockController.php',
     'DrydockCreateBlueprintsCapability' => 'applications/drydock/capability/DrydockCreateBlueprintsCapability.php',
+    'DrydockCustomAttributes' => 'applications/drydock/util/DrydockCustomAttributes.php',
+    'DrydockCustomAttributesTestCase' => 'applications/drydock/util/__tests__/DrydockCustomAttributesTestCase.php',
     'DrydockDAO' => 'applications/drydock/storage/DrydockDAO.php',
     'DrydockDefaultEditCapability' => 'applications/drydock/capability/DrydockDefaultEditCapability.php',
     'DrydockDefaultViewCapability' => 'applications/drydock/capability/DrydockDefaultViewCapability.php',
@@ -2901,6 +2903,7 @@
     'PhabricatorStandardCustomFieldRemarkup' => 'infrastructure/customfield/standard/PhabricatorStandardCustomFieldRemarkup.php',
     'PhabricatorStandardCustomFieldSelect' => 'infrastructure/customfield/standard/PhabricatorStandardCustomFieldSelect.php',
     'PhabricatorStandardCustomFieldText' => 'infrastructure/customfield/standard/PhabricatorStandardCustomFieldText.php',
+    'PhabricatorStandardCustomFieldTextarea' => 'infrastructure/customfield/standard/PhabricatorStandardCustomFieldTextarea.php',
     'PhabricatorStandardCustomFieldUsers' => 'infrastructure/customfield/standard/PhabricatorStandardCustomFieldUsers.php',
     'PhabricatorStandardPageView' => 'view/page/PhabricatorStandardPageView.php',
     'PhabricatorStandardSelectCustomFieldDatasource' => 'infrastructure/customfield/datasource/PhabricatorStandardSelectCustomFieldDatasource.php',
@@ -4500,6 +4503,8 @@
     'DrydockConstants' => 'Phobject',
     'DrydockController' => 'PhabricatorController',
     'DrydockCreateBlueprintsCapability' => 'PhabricatorPolicyCapability',
+    'DrydockCustomAttributes' => 'Phobject',
+    'DrydockCustomAttributesTestCase' => 'PhabricatorTestCase',
     'DrydockDAO' => 'PhabricatorLiskDAO',
     'DrydockDefaultEditCapability' => 'PhabricatorPolicyCapability',
     'DrydockDefaultViewCapability' => 'PhabricatorPolicyCapability',
@@ -6976,6 +6981,7 @@
     'PhabricatorStandardCustomFieldRemarkup' => 'PhabricatorStandardCustomField',
     'PhabricatorStandardCustomFieldSelect' => 'PhabricatorStandardCustomField',
     'PhabricatorStandardCustomFieldText' => 'PhabricatorStandardCustomField',
+    'PhabricatorStandardCustomFieldTextarea' => 'PhabricatorStandardCustomField',
     'PhabricatorStandardCustomFieldUsers' => 'PhabricatorStandardCustomFieldPHIDs',
     'PhabricatorStandardPageView' => 'PhabricatorBarePageView',
     'PhabricatorStandardSelectCustomFieldDatasource' => 'PhabricatorTypeaheadDatasource',
diff --git a/src/applications/drydock/blueprint/DrydockBlueprintImplementation.php b/src/applications/drydock/blueprint/DrydockBlueprintImplementation.php
--- a/src/applications/drydock/blueprint/DrydockBlueprintImplementation.php
+++ b/src/applications/drydock/blueprint/DrydockBlueprintImplementation.php
@@ -60,8 +60,30 @@
     return $this;
   }
 
+  public function supportsAutomaticCustomAttributes() {
+    return true;
+  }
+
   public function getFieldSpecifications() {
-    return array();
+    if ($this->supportsAutomaticCustomAttributes()) {
+      return array(
+        'attr-header' => array(
+          'name' => pht('Custom Attributes'),
+          'type' => 'header',
+        ),
+        'attributes' => array(
+          'name' => pht('Attributes'),
+          'type' => 'textarea',
+          'caption' => pht(
+            'A newline separated list of custom blueprint '.
+            'attributes.  Each attribute should be specified in '.
+            'a key=value format.'),
+          'monospace' => true,
+        ),
+      );
+    } else {
+      return array();
+    }
   }
 
   public function getDetail($key, $default = null) {
@@ -81,6 +103,16 @@
 
     $scope = $this->pushActiveScope($resource, $lease);
 
+    if ($this->supportsAutomaticCustomAttributes()) {
+      $custom_match = DrydockCustomAttributes::hasRequirements(
+        $lease->getAttributes(),
+        $this->getDetail('attributes', ''));
+
+      if (!$custom_match) {
+        return false;
+      }
+    }
+
     return $this->canAllocateLease($resource, $lease);
   }
 
diff --git a/src/applications/drydock/blueprint/DrydockMinMaxBlueprintImplementation.php b/src/applications/drydock/blueprint/DrydockMinMaxBlueprintImplementation.php
--- a/src/applications/drydock/blueprint/DrydockMinMaxBlueprintImplementation.php
+++ b/src/applications/drydock/blueprint/DrydockMinMaxBlueprintImplementation.php
@@ -94,6 +94,6 @@
           'overallocate the lease to an existing resource and '.
           'exceed the limit specified here.'),
       ),
-    );
+    ) + parent::getFieldSpecifications();
   }
 }
diff --git a/src/applications/drydock/util/DrydockCustomAttributes.php b/src/applications/drydock/util/DrydockCustomAttributes.php
new file mode 100644
--- /dev/null
+++ b/src/applications/drydock/util/DrydockCustomAttributes.php
@@ -0,0 +1,48 @@
+<?php
+
+final class DrydockCustomAttributes extends Phobject {
+
+  public static function parse($text) {
+    if ($text === null || trim($text) === '') {
+      return array();
+    }
+
+    $pairs = phutil_split_lines($text);
+    $attributes = array();
+
+    foreach ($pairs as $line) {
+      $kv = explode('=', $line, 2);
+      if (count($kv) === 0) {
+        continue;
+      } else if (count($kv) === 1) {
+        $attributes['attr_'.$kv[0]] = true;
+      } else {
+        $attributes['attr_'.$kv[0]] = trim($kv[1]);
+      }
+    }
+
+    return $attributes;
+  }
+
+  public static function hasRequirements($attributes, $provided) {
+    $provided = self::parse($provided);
+
+    foreach ($attributes as $key => $value) {
+      // Only compare custom attributes.
+      if (substr($key, 0, 5) === 'attr_') {
+        if ($value === true) {
+          if (!array_key_exists($provided, $key)) {
+            return false;
+          }
+        } else {
+          if (idx($provided, $key) !== $value) {
+            return false;
+          }
+        }
+      }
+    }
+
+    return true;
+  }
+
+}
diff --git a/src/applications/drydock/util/__tests__/DrydockCustomAttributesTestCase.php b/src/applications/drydock/util/__tests__/DrydockCustomAttributesTestCase.php
new file mode 100644
--- /dev/null
+++ b/src/applications/drydock/util/__tests__/DrydockCustomAttributesTestCase.php
@@ -0,0 +1,27 @@
+<?php
+
+final class DrydockCustomAttributesTestCase extends PhabricatorTestCase {
+
+  public function testNullAttributes() {
+    $result = DrydockCustomAttributes::parse(null);
+    $this->assertEqual(array(), $result);
+  }
+
+  public function testEmptyAttributes() {
+    $result = DrydockCustomAttributes::parse('');
+    $this->assertEqual(array(), $result);
+  }
+
+  public function testSingleAttribute() {
+    $result = DrydockCustomAttributes::parse('abc=123');
+    $this->assertEqual(array('attr_abc' => '123'), $result);
+  }
+
+  public function testMultipleAttributes() {
+    $result = DrydockCustomAttributes::parse("abc=123\nxyz=456");
+    $this->assertEqual(array(
+        'attr_abc' => '123',
+        'attr_xyz' => '456',
+      ), $result);
+  }
+}
diff --git a/src/applications/drydock/worker/DrydockAllocatorWorker.php b/src/applications/drydock/worker/DrydockAllocatorWorker.php
--- a/src/applications/drydock/worker/DrydockAllocatorWorker.php
+++ b/src/applications/drydock/worker/DrydockAllocatorWorker.php
@@ -220,6 +220,16 @@
             continue;
           }
 
+          if ($candidate_blueprint->supportsAutomaticCustomAttributes()) {
+            $custom_match = DrydockCustomAttributes::hasRequirements(
+              $lease->getAttributes(),
+              $candidate_blueprint->getDetail('attributes', ''));
+            if (!$custom_match) {
+              unset($blueprints[$key]);
+              continue;
+            }
+          }
+
           if (!$candidate_blueprint->canAllocateResourceForLease($lease)) {
             unset($blueprints[$key]);
             continue;
diff --git a/src/applications/harbormaster/step/HarbormasterLeaseHostBuildStepImplementation.php b/src/applications/harbormaster/step/HarbormasterLeaseHostBuildStepImplementation.php
--- a/src/applications/harbormaster/step/HarbormasterLeaseHostBuildStepImplementation.php
+++ b/src/applications/harbormaster/step/HarbormasterLeaseHostBuildStepImplementation.php
@@ -32,13 +32,16 @@
     $artifact = count($artifacts) > 0 ? head($artifacts) : null;
 
     if ($artifact === null) {
+      $custom_attributes = DrydockCustomAttributes::parse(
+        idx($settings, 'attributes', ''));
+
       // Create the lease.
       $lease = id(new DrydockLease())
         ->setResourceType('host')
         ->setAttributes(
           array(
             'platform' => $settings['platform'],
-          ))
+          ) + $custom_attributes)
         ->queueForActivation();
 
       // Create the associated artifact.
@@ -87,6 +90,14 @@
         'type' => 'text',
         'required' => true,
       ),
+      'attributes' => array(
+        'name' => pht('Required Attributes'),
+        'type' => 'textarea',
+        'caption' => pht(
+          'A newline separated list of required host attributes.  Each '.
+          'attribute should be specified in a key=value format.'),
+        'monospace' => true,
+      ),
     );
   }
 
diff --git a/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldTextarea.php b/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldTextarea.php
new file mode 100644
--- /dev/null
+++ b/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldTextarea.php
@@ -0,0 +1,74 @@
+<?php
+
+final class PhabricatorStandardCustomFieldTextarea
+  extends PhabricatorStandardCustomField {
+
+  public function getFieldType() {
+    return 'textarea';
+  }
+
+  public function renderEditControl(array $handles) {
+    $monospace = $this->getFieldConfigValue('monospace', false);
+    $custom_class =
+      $monospace ? 'aphront-form-control-textarea-monospace' : null;
+
+    return id(new AphrontFormTextAreaControl())
+      ->setLabel($this->getFieldName())
+      ->setName($this->getFieldKey())
+      ->setCaption($this->getCaption())
+      ->setValue($this->getFieldValue())
+      ->setCustomClass($custom_class);
+  }
+
+  public function getStyleForPropertyView() {
+    return 'block';
+  }
+
+  public function getApplicationTransactionRemarkupBlocks(
+    PhabricatorApplicationTransaction $xaction) {
+    return array(
+      $xaction->getNewValue(),
+    );
+  }
+
+  public function renderPropertyViewValue(array $handles) {
+    $value = $this->getFieldValue();
+
+    if (!strlen($value)) {
+      return null;
+    }
+
+    return phutil_tag(
+      'pre',
+      array(),
+      $value);
+  }
+
+  public function getApplicationTransactionTitle(
+    PhabricatorApplicationTransaction $xaction) {
+    $author_phid = $xaction->getAuthorPHID();
+
+    // TODO: Expose fancy transactions.
+
+    return pht(
+      '%s edited %s.',
+      $xaction->renderHandleLink($author_phid),
+      $this->getFieldName());
+  }
+
+  public function shouldAppearInHerald() {
+    return true;
+  }
+
+  public function getHeraldFieldConditions() {
+    return array(
+      HeraldAdapter::CONDITION_CONTAINS,
+      HeraldAdapter::CONDITION_NOT_CONTAINS,
+      HeraldAdapter::CONDITION_IS,
+      HeraldAdapter::CONDITION_IS_NOT,
+      HeraldAdapter::CONDITION_REGEXP,
+    );
+  }
+
+
+}
diff --git a/webroot/rsrc/css/phui/phui-form-view.css b/webroot/rsrc/css/phui/phui-form-view.css
--- a/webroot/rsrc/css/phui/phui-form-view.css
+++ b/webroot/rsrc/css/phui/phui-form-view.css
@@ -154,6 +154,10 @@
   height: 24em;
 }
 
+.aphront-form-control-textarea-monospace {
+  font-family: monospace;
+}
+
 .aphront-form-control-select .aphront-form-input {
   padding-top: 2px;
 }