diff --git a/app/models/fluentd/agent/common.rb b/app/models/fluentd/agent/common.rb
index c403a35..c101261 100644
--- a/app/models/fluentd/agent/common.rb
+++ b/app/models/fluentd/agent/common.rb
@@ -160,7 +160,7 @@ class Fluentd
           when "label"
             label_content = header + scanner.scan_until(%r{^</label>})
             label, sections = parse_label_section(label_content, started)
-            contents["label:#{label}"] << { pos: started, sections: sections }
+            contents["label:#{label}"] << { label: label, pos: started, sections: sections }
           else
             raise TypeError, "Unknown section: #{started}: #{section_type}"
           end
@@ -179,10 +179,43 @@ class Fluentd
           header = scanner.scan_until(/^\s*<(filter|match)/)
           type = scanner[1]
           source = header + scanner.scan_until(%r{^\s*</(?:filter|match)>})
-          sections[type] << { pos: pos + offset, content: source.sub(/\n/, "") }
+          sections[type] << { label: label, pos: pos + offset, content: source.sub(/\n+/, "") }
         end
         return label, sections
       end
+
+      def dump_parsed_config(parsed_config)
+        content = "".dup
+        sources = parsed_config["source"] || []
+        filters = parsed_config["filter"] || []
+        matches = parsed_config["match"] || []
+        labels = parsed_config.select do |key, sections|
+          key.start_with?("label:")
+        end
+        labels = labels.values.flatten
+        sorted_sections = (sources + filters + matches + labels).sort_by do |section|
+          section[:pos]
+        end
+        sorted_sections.each do |section|
+          if section.key?(:label)
+            label = section[:label]
+            sub_filters = section.dig(:sections, "filter") || []
+            sub_matches = section.dig(:sections, "match") || []
+            sub_sections = (sub_filters + sub_matches).sort_by do |sub_section|
+              sub_section[:pos]
+            end
+            content << "<label #{label}>\n"
+            sub_sections.each do |sub_section|
+              content << sub_section[:content] << "\n\n"
+            end
+            content.chomp!
+            content << "</label>\n\n"
+          else
+            content << section[:content] << "\n\n"
+          end
+        end
+        content.chomp
+      end
     end
   end
 end
diff --git a/test/models/fluentd/agent_common_test.rb b/test/models/fluentd/agent_common_test.rb
index 015f51b..7280ddd 100644
--- a/test/models/fluentd/agent_common_test.rb
+++ b/test/models/fluentd/agent_common_test.rb
@@ -42,7 +42,7 @@ class Fluentd
             { pos: 44, content: filter_section_content }
           ],
           "match" => [
-            { pos: 84, content: match_section_content }
+            { pos: 85, content: match_section_content }
           ]
         }
         assert_equal(expected, actual)
@@ -69,10 +69,10 @@ class Fluentd
         CONFIG
         sections = {
           "filter" => [
-            { pos: 75, content: filter_section_content}
+            { label: "@INPUT", pos: 76, content: filter_section_content}
           ],
           "match" => [
-            { pos: 121, content: match_section_content}
+            { label: "@INPUT", pos: 122, content: match_section_content}
           ]
         }
         expected = {
@@ -80,7 +80,7 @@ class Fluentd
             { pos: 0, content: source_section_content }
           ],
           "label:@INPUT" => [
-            { pos: 60, sections: sections }
+            { label: "@INPUT", pos: 60, sections: sections }
           ]
         }
         assert_equal(expected, actual)
@@ -115,10 +115,10 @@ class Fluentd
         CONFIG
         input_sections = {
           "filter" => [
-            { pos: 140, content: filter_section_content }
+            { label: "@INPUT", pos: 140, content: filter_section_content }
           ],
           "match" => [
-            { pos: 187, content: match_section_content }
+            { label: "@INPUT", pos: 187, content: match_section_content }
           ]
         }
         filter_secion_content1 = <<-CONFIG.chomp
@@ -143,12 +143,12 @@ class Fluentd
         CONFIG
         main_sections = {
           "filter" => [
-            { pos: 274, content: filter_secion_content1 },
-            { pos: 321, content: filter_secion_content2 }
+            { label: "@MAIN", pos: 275, content: filter_secion_content1 },
+            { label: "@MAIN", pos: 322, content: filter_secion_content2 }
           ],
           "match" => [
-            { pos: 368, content: match_secion_content1 },
-            { pos: 413, content: match_secion_content2 }
+            { label: "@MAIN", pos: 370, content: match_secion_content1 },
+            { label: "@MAIN", pos: 416, content: match_secion_content2 }
           ]
         }
         expected = {
@@ -157,14 +157,34 @@ class Fluentd
             { pos: 61, content: source_section_content2 },
           ],
           "label:@INPUT" => [
-            { pos: 124, sections: input_sections }
+            { label: "@INPUT", pos: 124, sections: input_sections }
           ],
           "label:@MAIN" => [
-            { pos: 259, sections: main_sections }
+            { label: "@MAIN", pos: 260, sections: main_sections }
           ]
         }
         assert_equal(expected, actual)
       end
     end
+
+    sub_test_case "#dump_parsed_config" do
+      test "simple" do
+        parsed_config = @agent.__send__(:parse_config, fixture_content("config/simple.conf"))
+        config = @agent.__send__(:dump_parsed_config, parsed_config)
+        assert_equal(fixture_content("config/simple.conf"), config)
+      end
+
+      test "simple label" do
+        parsed_config = @agent.__send__(:parse_config, fixture_content("config/label.conf"))
+        config = @agent.__send__(:dump_parsed_config, parsed_config)
+        assert_equal(fixture_content("config/label.conf"), config)
+      end
+
+      test "multiple labels" do
+        parsed_config = @agent.__send__(:parse_config, fixture_content("config/multi-label.conf"))
+        config = @agent.__send__(:dump_parsed_config, parsed_config)
+        assert_equal(fixture_content("config/multi-label.conf"), config)
+      end
+    end
   end
 end