diff --git a/devops-service/db/mongo/models/deploy_env/cloud_deploy_env.rb b/devops-service/db/mongo/models/deploy_env/cloud_deploy_env.rb
index dc62b4d..a19abcc 100644
--- a/devops-service/db/mongo/models/deploy_env/cloud_deploy_env.rb
+++ b/devops-service/db/mongo/models/deploy_env/cloud_deploy_env.rb
@@ -11,28 +11,28 @@ module Devops
   module Model
     class CloudDeployEnv < DeployEnvBase
 
-      attr_accessor :flavor, :image, :subnets, :groups, :stack_template
+#      attr_accessor :flavor, :image, :subnets, :groups, :stack_template
 
       set_validators ::Validators::DeployEnv::Flavor,
                      ::Validators::DeployEnv::Image,
                      ::Validators::DeployEnv::Groups,
                      ::Validators::DeployEnv::StackTemplate
 #      set_validators ::Validators::DeployEnv::CloudParameters
-      set_field_validators :flavor, ::Validators::FieldValidator::Nil,
+      set_field_validators :flavor, [::Validators::FieldValidator::Nil,
                                     ::Validators::FieldValidator::FieldType::String,
-                                    ::Validators::FieldValidator::Flavor
-      set_field_validators :image, ::Validators::FieldValidator::Nil,
+                                    ::Validators::FieldValidator::Flavor], order: 2
+      set_field_validators :image, [::Validators::FieldValidator::Nil,
                                    ::Validators::FieldValidator::FieldType::String,
-                                   ::Validators::FieldValidator::Image
-      set_field_validators :subnets, ::Validators::FieldValidator::Nil,
-                                     ::Validators::FieldValidator::FieldType::Array
+                                   ::Validators::FieldValidator::Image], order: 2
+      set_field_validators :subnets, [::Validators::FieldValidator::Nil,
+                                     ::Validators::FieldValidator::FieldType::Array], order: 4
 #                                     ::Validators::FieldValidator::Subnets.new
-      set_field_validators :groups, ::Validators::FieldValidator::Nil,
-                                    ::Validators::FieldValidator::FieldType::Array
+      set_field_validators :groups, [::Validators::FieldValidator::Nil,
+                                    ::Validators::FieldValidator::FieldType::Array], order: 4
 #                                    ::Validators::FieldValidator::Groups.new
-      set_field_validators :stack_template, ::Validators::FieldValidator::Nil,
+      set_field_validators :stack_template, [::Validators::FieldValidator::Nil,
                                             ::Validators::FieldValidator::FieldType::String,
-                                            ::Validators::FieldValidator::NotEmpty,
+                                            ::Validators::FieldValidator::NotEmpty], order: 2
 #                                            ::Validators::FieldValidator::StackTemplate.new
 
       def initialize d={}
diff --git a/devops-service/db/mongo/models/deploy_env/deploy_env_base.rb b/devops-service/db/mongo/models/deploy_env/deploy_env_base.rb
index b5aec77..c832d20 100644
--- a/devops-service/db/mongo/models/deploy_env/deploy_env_base.rb
+++ b/devops-service/db/mongo/models/deploy_env/deploy_env_base.rb
@@ -8,27 +8,27 @@ module Devops
 
       include ModelWithProvider
 
-      attr_accessor :identifier, :run_list, :expires, :users
+#      attr_accessor :identifier, :run_list, :expires, :users
 
       set_validators ::Validators::DeployEnv::RunList,
                      ::Validators::DeployEnv::Expiration,
                      ::Validators::DeployEnv::Users
 
-      set_field_validators :identifier, ::Validators::FieldValidator::NotNil,
+      set_field_validators :identifier, [::Validators::FieldValidator::NotNil,
                                         ::Validators::FieldValidator::FieldType::String,
                                         ::Validators::FieldValidator::NotEmpty,
-                                        ::Validators::FieldValidator::Name
+                                        ::Validators::FieldValidator::Name]
 
-      set_field_validators :run_list, ::Validators::FieldValidator::NotNil,
+      set_field_validators :run_list, [::Validators::FieldValidator::NotNil,
                                       ::Validators::FieldValidator::FieldType::Array,
-                                      ::Validators::FieldValidator::RunList
+                                      ::Validators::FieldValidator::RunList]
 
-      set_field_validators :users, ::Validators::FieldValidator::NotNil,
-                                   ::Validators::FieldValidator::FieldType::Array
+      set_field_validators :users, [::Validators::FieldValidator::NotNil,
+                                   ::Validators::FieldValidator::FieldType::Array]
 
-      set_field_validators :expires, ::Validators::FieldValidator::Nil,
+      set_field_validators :expires, [::Validators::FieldValidator::Nil,
                                      ::Validators::FieldValidator::FieldType::String,
-                                     ::Validators::FieldValidator::Expires
+                                     ::Validators::FieldValidator::Expires]
 
       def initialize d={}
         self.identifier = d["identifier"]
diff --git a/devops-service/db/mongo/models/deploy_env/deploy_env_ec2.rb b/devops-service/db/mongo/models/deploy_env/deploy_env_ec2.rb
index 5377a57..5e54ba0 100644
--- a/devops-service/db/mongo/models/deploy_env/deploy_env_ec2.rb
+++ b/devops-service/db/mongo/models/deploy_env/deploy_env_ec2.rb
@@ -4,11 +4,11 @@ module Devops
   module Model
     class DeployEnvEc2 < CloudDeployEnv
 
-      attr_accessor :vpc_id
+#      attr_accessor :vpc_id
 
-      set_field_validators :vpc_id, ::Validators::FieldValidator::Nil,
+      set_field_validators :vpc_id, [::Validators::FieldValidator::Nil,
                                     ::Validators::FieldValidator::FieldType::String,
-                                    ::Validators::FieldValidator::Vpc
+                                    ::Validators::FieldValidator::Vpc], order: 3
 =begin
 @Deprecated
       types :identifier => {:type => String, :empty => false},
diff --git a/devops-service/db/mongo/models/image.rb b/devops-service/db/mongo/models/image.rb
index 728a66a..5d68393 100644
--- a/devops-service/db/mongo/models/image.rb
+++ b/devops-service/db/mongo/models/image.rb
@@ -8,7 +8,7 @@ module Devops
     class Image < MongoModel
       include ModelWithProvider
 
-      attr_accessor :id, :remote_user, :name, :bootstrap_template
+#      attr_accessor :id, :remote_user, :name, :bootstrap_template
 =begin
       types :id => {:type => String, :empty => false},
             :provider => {:type => String, :empty => false},
@@ -20,27 +20,27 @@ module Devops
 #      set_validators ::Validators::Image::ImageInFilter,
 #                     ::Validators::Image::BootstrapTemplate
 
-      set_field_validators :id, ::Validators::FieldValidator::NotNil,
+      set_field_validators :id, [::Validators::FieldValidator::NotNil,
                                 ::Validators::FieldValidator::FieldType::String,
                                 ::Validators::FieldValidator::NotEmpty,
                                 ::Validators::FieldValidator::ImageName,
-                                ::Validators::Image::ImageInFilter
+                                ::Validators::Image::ImageInFilter]
 
-      set_field_validators :remote_user, ::Validators::FieldValidator::NotNil,
+      set_field_validators :remote_user, [::Validators::FieldValidator::NotNil,
                                          ::Validators::FieldValidator::FieldType::String,
                                          ::Validators::FieldValidator::NotEmpty,
-                                         ::Validators::FieldValidator::Name
+                                         ::Validators::FieldValidator::Name]
 
-      set_field_validators :name, ::Validators::FieldValidator::NotNil,
+      set_field_validators :name, [::Validators::FieldValidator::NotNil,
                                   ::Validators::FieldValidator::FieldType::String,
                                   ::Validators::FieldValidator::NotEmpty,
-                                  ::Validators::FieldValidator::ImageName
+                                  ::Validators::FieldValidator::ImageName]
 
-      set_field_validators :bootstrap_template, ::Validators::FieldValidator::Nil,
+      set_field_validators :bootstrap_template, [::Validators::FieldValidator::Nil,
                                                 ::Validators::FieldValidator::FieldType::String,
                                                 ::Validators::FieldValidator::NotEmpty,
                                                 ::Validators::FieldValidator::Name,
-                                                ::Validators::Image::BootstrapTemplate
+                                                ::Validators::Image::BootstrapTemplate]
 
       def validate!
         validate_id!
diff --git a/devops-service/db/mongo/models/model_with_provider.rb b/devops-service/db/mongo/models/model_with_provider.rb
index 850b7ee..b7a5d36 100644
--- a/devops-service/db/mongo/models/model_with_provider.rb
+++ b/devops-service/db/mongo/models/model_with_provider.rb
@@ -4,14 +4,19 @@ module Devops
   module Model
     module ModelWithProvider
 
-      attr_accessor :provider, :provider_account
+#      attr_accessor :provider, :provider_account
 
       def ModelWithProvider.included(mod)
 
-        mod.set_field_validators :provider, ::Validators::FieldValidator::NotNil,
+        mod.set_field_validators :provider, [::Validators::FieldValidator::NotNil,
                                             ::Validators::FieldValidator::FieldType::String,
                                             ::Validators::FieldValidator::NotEmpty,
-                                            ::Validators::FieldValidator::Provider
+                                            ::Validators::FieldValidator::Provider]
+
+        mod.set_field_validators :provider_account, [::Validators::FieldValidator::Nil,
+                                                     ::Validators::FieldValidator::FieldType::String,
+                                                     ::Validators::FieldValidator::NotEmpty,
+                                                     ::Validators::FieldValidator::ProviderAccount], order: 1
       end
 
       def provider_instance
diff --git a/devops-service/db/mongo/models/mongo_model.rb b/devops-service/db/mongo/models/mongo_model.rb
index 3721a5c..894da96 100644
--- a/devops-service/db/mongo/models/mongo_model.rb
+++ b/devops-service/db/mongo/models/mongo_model.rb
@@ -68,15 +68,20 @@ module Devops
 
       def validate_fields!
         result = []
-        self.class.field_validators.each do |field, validation_method|
-          begin
-            self.send(validation_method)
-          rescue InvalidRecord => e
-            result << {key: field, message: e.message}
+        orders = self.class.field_validators.keys.sort
+        orders.each do |order|
+          self.class.field_validators[order].each do |elem|
+            field = elem[:field]
+            validation_method = elem[:method]
+            begin
+              self.send(validation_method)
+            rescue InvalidRecord => e
+              result << {key: field, message: e.message}
+            end
+          end
+          unless result.empty?
+            raise InvalidRecord.new(error_data: result)
           end
-        end
-        unless result.empty?
-          raise InvalidRecord.new(error_data: result)
         end
         true
       end
@@ -142,6 +147,12 @@ module Devops
       class << self
 
         attr_accessor :validators
+
+        # hash:
+        #   key - (integer) validators order
+        #   value - (hash) validator params:
+        #     field: (string) field name
+        #     method: (string) field validator method
         attr_accessor :field_validators
 
         def inherited(subclass)
@@ -159,14 +170,29 @@ module Devops
 
         # validate field value
         # if method validate! returns false, then stop validation without error
-        def set_field_validators field, *validators
+        #
+        # field - (string) field name to validate
+        # validators - (array) validators list
+        # options - (hash) options for validator
+        #   order: integer - run validator in order with index order:
+        def set_field_validators field, validators, options={}
+          attr_accessor field
           method_name = "validate_" + field.to_s + "!"
           define_method(method_name) do
             validators.each do |validator|
-              break unless validator.new(self, send(field)).validate!
+              break unless validator.new(self, field).validate!
             end
           end
-          self.field_validators[field] = method_name
+          order = options[:order] || 0
+          obj = {
+            field: field,
+            method: method_name
+          }
+          unless self.field_validators[order]
+            self.field_validators[order] = [obj]
+          else
+            self.field_validators[order] << obj
+          end
         end
 
         # private class methods
diff --git a/devops-service/db/mongo/models/provider_accounts/ec2_provider_account.rb b/devops-service/db/mongo/models/provider_accounts/ec2_provider_account.rb
index 3f2fb41..95117bb 100644
--- a/devops-service/db/mongo/models/provider_accounts/ec2_provider_account.rb
+++ b/devops-service/db/mongo/models/provider_accounts/ec2_provider_account.rb
@@ -4,15 +4,15 @@ module Devops
   module Model
     class Ec2ProviderAccount < ProviderAccount
 
-      attr_accessor :access_key_id, :availability_zone, :secret_access_key
+#      attr_accessor :access_key_id, :availability_zone, :secret_access_key
 
-      set_field_validators :access_key_id, ::Validators::FieldValidator::NotNil,
+      set_field_validators :access_key_id, [::Validators::FieldValidator::NotNil,
                                            ::Validators::FieldValidator::FieldType::String,
-                                           ::Validators::FieldValidator::NotEmpty
+                                           ::Validators::FieldValidator::NotEmpty]
 
-      set_field_validators :secret_access_key, ::Validators::FieldValidator::NotNil,
+      set_field_validators :secret_access_key, [::Validators::FieldValidator::NotNil,
                                                ::Validators::FieldValidator::FieldType::String,
-                                               ::Validators::FieldValidator::NotEmpty
+                                               ::Validators::FieldValidator::NotEmpty]
       def initialize a={}
         super(a)
         self.provider = Provider::Ec2::PROVIDER
diff --git a/devops-service/db/mongo/models/provider_accounts/provider_account.rb b/devops-service/db/mongo/models/provider_accounts/provider_account.rb
index 3a6fb59..d3c9c42 100644
--- a/devops-service/db/mongo/models/provider_accounts/provider_account.rb
+++ b/devops-service/db/mongo/models/provider_accounts/provider_account.rb
@@ -7,22 +7,22 @@ module Devops
 
       include ModelWithProvider
 
-      attr_accessor :account_name, :description, :ssh_key
+#      attr_accessor :account_name, :description, :ssh_key
 
-      set_field_validators :account_name, ::Validators::FieldValidator::NotNil,
+      set_field_validators :account_name, [::Validators::FieldValidator::NotNil,
                                           ::Validators::FieldValidator::FieldType::String,
                                           ::Validators::FieldValidator::NotEmpty,
-                                          ::Validators::FieldValidator::Name
+                                          ::Validators::FieldValidator::Name]
 
-      set_field_validators :description, ::Validators::FieldValidator::Nil,
+      set_field_validators :description, [::Validators::FieldValidator::Nil,
                                          ::Validators::FieldValidator::FieldType::String,
                                          ::Validators::FieldValidator::NotEmpty,
-                                         ::Validators::FieldValidator::Description
+                                         ::Validators::FieldValidator::Description]
 
-      set_field_validators :ssh_key, ::Validators::FieldValidator::NotNil,
+      set_field_validators :ssh_key, [::Validators::FieldValidator::NotNil,
                                      ::Validators::FieldValidator::FieldType::String,
                                      ::Validators::FieldValidator::NotEmpty,
-                                     ::Validators::FieldValidator::SshKey
+                                     ::Validators::FieldValidator::SshKey]
 
       ACCOUNT_FIELDS = {
         account_name: "Account name (id)",
diff --git a/devops-service/db/mongo/models/user.rb b/devops-service/db/mongo/models/user.rb
index b16e032..e13b4f1 100644
--- a/devops-service/db/mongo/models/user.rb
+++ b/devops-service/db/mongo/models/user.rb
@@ -12,20 +12,20 @@ module Devops
       PRIVILEGES = ["r", "w", "x"]
       PRIVILEGES_REGEX = /^r?w?x?$/
 
-      attr_accessor :id, :password, :privileges, :email
-      types :id => {:type => String, :empty => false},
-            :email => {:type => String, :empty => false},
-            :password => {:type => String, :empty => true}
+#      attr_accessor :id, :password, :privileges, :email
+#      types :id => {:type => String, :empty => false},
+#            :email => {:type => String, :empty => false},
+#            :password => {:type => String, :empty => true}
 
-      set_field_validators :id, ::Validators::FieldValidator::NotNil,
+      set_field_validators :id, [::Validators::FieldValidator::NotNil,
                                 ::Validators::FieldValidator::FieldType::String,
-                                ::Validators::FieldValidator::Name
-      set_field_validators :password, ::Validators::FieldValidator::NotNil,
-                                      ::Validators::FieldValidator::FieldType::String
-      set_field_validators :email, ::Validators::FieldValidator::NotNil,
-                                   ::Validators::FieldValidator::FieldType::String
-      set_field_validators :privileges, ::Validators::FieldValidator::NotNil,
-                                        ::Validators::FieldValidator::FieldType::Hash
+                                ::Validators::FieldValidator::Name]
+      set_field_validators :password, [::Validators::FieldValidator::NotNil,
+                                      ::Validators::FieldValidator::FieldType::String]
+      set_field_validators :email, [::Validators::FieldValidator::NotNil,
+                                   ::Validators::FieldValidator::FieldType::String]
+      set_field_validators :privileges, [::Validators::FieldValidator::NotNil,
+                                        ::Validators::FieldValidator::FieldType::Hash]
       def initialize p={}
         self.id = p['username']
         self.email = p['email']
diff --git a/devops-service/db/validators/field_validators/base.rb b/devops-service/db/validators/field_validators/base.rb
index 8c60d57..c76395b 100644
--- a/devops-service/db/validators/field_validators/base.rb
+++ b/devops-service/db/validators/field_validators/base.rb
@@ -2,9 +2,10 @@ module Validators
   module FieldValidator
     class Base
 
-      def initialize model, value
+      def initialize model, field
         @model = model
-        @value = value
+        @field = field
+        @value = model.send(field)
       end
 
       def validate!
diff --git a/devops-service/db/validators/field_validators/provider_account.rb b/devops-service/db/validators/field_validators/provider_account.rb
new file mode 100644
index 0000000..3d56074
--- /dev/null
+++ b/devops-service/db/validators/field_validators/provider_account.rb
@@ -0,0 +1,17 @@
+require_relative "base"
+
+module Validators
+  module FieldValidator
+    class ProviderAccount < Base
+
+      def valid?
+        accounts = AccountsFactory.accounts(@model.provider)
+        accounts.map{|a| a.account_name}.include?(@value)
+      end
+
+      def message
+        "Account '#{@value}' for provider '#{@model.provider}' does not exist"
+      end
+    end
+  end
+end
diff --git a/devops-service/providers/accounts_factory.rb b/devops-service/providers/accounts_factory.rb
index 7f212e9..07906e1 100644
--- a/devops-service/providers/accounts_factory.rb
+++ b/devops-service/providers/accounts_factory.rb
@@ -1,6 +1,14 @@
 module Provider
   class AccountsFactory
 
+    class << self
+
+      def accounts provider_name
+        Devops::Db.connector.provider_accounts(provider_name)
+      end
+
+    end
+
     def init config
 
     end
@@ -22,7 +30,7 @@ module Provider
     end
 
     def accounts
-      Devops::Db.connector.provider_accounts(provider_name)
+      AccountsFactory.accounts(provider_name)
     end
 
     def create_account hash
diff --git a/devops-service/providers/ec2.rb b/devops-service/providers/ec2.rb
index af5e7fa..e593ad6 100644
--- a/devops-service/providers/ec2.rb
+++ b/devops-service/providers/ec2.rb
@@ -205,7 +205,7 @@ module Provider
     end
 
     def cloud_formation
-     @cloud_formation ||= Fog::AWS::CloudFormation.new(connection_options)
+      @cloud_formation ||= Fog::AWS::CloudFormation.new(connection_options)
     end
 
     def create_stack(stack, out)