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diff --git a/document/applykafka/single_db.md b/document/applykafka/single_db.md
new file mode 100644
index 0000000..e6aa4f8
--- /dev/null
+++ b/document/applykafka/single_db.md
@@ -0,0 +1,300 @@
+[이전 장(링크)](https://imprint.tistory.com/237?category=1069520) 에서는 마이크로서비스 간의 데이터 동기화 문제를 해결하기 위하여 `Kafka Connect`를 사용해보았다.
+이번 장에서는 동일한 역할을 하는 여러 서비스와 하나의 DB가 있을 때 `Kafka`를 사용하여 데이터를 동기화하는 방법에 대해서 알아본다.
+모든 소스 코드는 [깃 허브 (링크)](https://github.com/roy-zz/spring-cloud) 에 올려두었다.
+
+---
+
+### Service Flow
+
+전체적인 서비스 흐름을 살펴보면 아래의 이미지와 같다.
+
+![](image/single-database-service-flow.png)
+
+여러 클라이언트가 `유저 서비스`에게 유저 정보 API를 호출한다.
+`유저 서비스`는 주문 정보를 만들기 위해서 `주문 서비스`의 API를 호출해야하고 `FeignClient` 또는 `RestTemplate`을 통해 분산되어있는 `주문 서비스`를 호출하게 된다.
+`주문 서비스`는 DB에 데이터를 넣기 위해 직접 SQL을 실행하는 것이 아니라 `Kafka Sink Connect`를 사용하여 데이터를 넣게 된다.
+
+---
+
+### Order Service (H2 -> MariaDB)
+
+기존의 `주문 서비스`는 실행할 때 내장 DB인 H2 DB를 실행시켜서 사용하도록 설정되어 있었다.
+몇개의 `주문 서비스`가 실행되더라도 단 하나의 DB를 바라볼 수 있도록 `주문 서비스`를 수정한다.
+
+1. 의존성 추가
+
+MariaDB에 접속할 수 있도록 build.gradle에 아래의 의존성을 추가한다.
+
+```bash
+implementation 'org.mariadb.jdbc:mariadb-java-client:3.0.4'
+```
+
+2. application.yml 수정
+
+H2 DB가 아닌 MariaDB를 사용할 수 있도록 `application.yml` 파일을 수정한다.
+
+```yaml
+datasource:
+  driver-class-name: org.mariadb.jdbc.Driver
+  url: jdbc:mariadb://localhost:3306/mydb
+  username: root
+  password: root
+# 변경 불필요한 부분 생략
+```
+
+3. h2-console 접속
+
+`주문 서비스`의 h2-console에 접속하여 아래의 이미지와 같이 MariaDB에 접속하기 위한 정보를 입력한다.
+
+![](image/access-order-service-h2-console.png)
+
+아래의 SQL을 사용하여 주문 테이블이 존재하고 데이터가 없는 것을 확인한다.
+
+```sql
+SELECT * FROM orders;
+```
+
+![](image/check-order-table.png)
+
+4. 주문 데이터 입력
+
+Postman을 사용하여 새로운 주문 정보를 입력한다.
+
+![](image/save-new-order.png)
+
+5. 데이터 입력 확인
+
+4번 단계에서 저장한 주문 데이터가 정상적으로 DB에 입력되었는지 확인한다.
+
+```sql
+SELECT * FROM orders;
+```
+
+![](image/check-add-order.png)
+
+---
+
+### Order Service (MariaDB Connector -> Kafka)
+
+우리는 바로 위에서 `주문 서비스`가 H2 DB가 아닌 MariaDB를 바라볼 수 있도록 수정하였다.
+이번에는 `MariaDB Connector`를 사용하여 바로 MariaDB에 연결하는 것이 아니라 중간에 `Kafka`를 두고 연결되도록 수정한다.
+
+1. 데이터 형식 확인
+
+우리는 DB에 주문 데이터를 넣기 위해 JSON 데이터를 생성하여 `Kafka` 토픽에 제공해야한다.
+JSON 데이터를 만들기 전에 우리가 만들어야하는 데이터 형식을 확인해본다.
+
+```json
+{
+  "schema": {
+    "type": "struct",
+    "fields": [
+      { "type": "string", "optional": true, "field": "order_id" },
+      { "type": "string", "optional": true, "field": "user_id" },
+      { "type": "string", "optional": true, "field": "product_id" },
+      { "type": "int32", "optional": false, "field": "quantity" },
+      { "type": "int32", "optional": false, "field": "total_price" },
+      { "type": "int32", "optional": false, "field": "unit_price" }
+    ],
+    "optional": false,
+    "name": "orders" },
+  "payload": {
+    "order_id": "053c474c-7dfb-4eec-bba8-34e88f1aba5d",
+    "user_id": "af7c15de-cf65-4174-96c6-fe9cb657ff3b",
+    "product_id": "CATALOG-0001",
+    "quantity": 5,
+    "total_price": 6000,
+    "unit_price": 1200
+  }
+}
+```
+
+2. 필요한 데이터 클래스 생성
+
+`Kafka` 토픽에 직접 전송할 `KafkaOrderDto` 클래스 파일과 해당 클래스 파일을 이루고 있는 데이터 클래스 파일을 생성한다.
+예시에 애노테이션 정보는 생략하며 모든 데이터 클래스 파일이 `@Data`, `@Builder`, `@AllArgsConstructor`을 사용하고 있다.
+
+**KafkaOrderDto**
+```java
+public class KafkaOrderDto implements Serializable {
+    private Schema schema;
+    private Payload payload;
+}
+```
+
+**Payload**
+
+`Kafka` 토픽으로 전달되는 데이터는 언더스코어 형식이지만 자바에서는 카멜케이스 형식으로 변수명을 사용하고 있다.
+카멜케이스 형식의 변수명을 JSON으로 변경될 때 언더스코어 방식으로 변경될 수 있도록 `@JsonNaming` 애노테이션을 사용하였다.
+`@JsonProperty`, `@JsonNaming` 관련하여 정리가 잘되어있는 블로그가 있어서 글의 하단부에 링크를 첨부하였다.
+
+```java
+@JsonNaming(PropertyNamingStrategies.SnakeCaseStrategy.class)
+public class Payload {
+    private String orderId;
+    private String userId;
+    private String produceId;
+    private int quantity;
+    private int totalPrice;
+    private int unitPrice;
+}
+```
+
+**Schema**
+```java
+public class Schema {
+    private String type;
+    private List<Field> fields;
+    private boolean optional;
+    private String name;
+}
+```
+
+**Field**
+```java
+public class Field {
+    private String type;
+    private boolean optional;
+    private String fields;
+}
+```
+
+3. OrderProducer 생성
+
+`Kafka` 토픽에 데이터를 집어넣는 OrderProducer 클래스 파일을 생성한다.
+파라미터로 전달받은 `OrderDto`를 토대로 `Kafka` 토픽에 전달해야하는 KafkaOrderDto를 생성하고 전달한다.
+
+**OrderProducer**
+```java
+public interface OrderProducer {
+    OrderDto send(String topic, OrderDto orderDto);
+}
+```
+
+**OrderProducerImpl**
+```java
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class OrderProducerImpl implements OrderProducer {
+    private final KafkaTemplate<String, String> kafkaTemplate;
+
+    private List<Field> fields = List.of(
+            new Field("string", true, "order_id"),
+            new Field("string", true, "user_id"),
+            new Field("string", true, "product_id"),
+            new Field("int32", true, "quantity"),
+            new Field("int32", true, "unit_price"),
+            new Field("int32", true, "total_price"));
+    private Schema schema = Schema.builder()
+            .type("struct")
+            .fields(fields)
+            .optional(false)
+            .name("orders")
+            .build();
+
+    @Override
+    public OrderDto send(String topic, OrderDto orderDto) {
+        Payload payload = Payload.builder()
+                .orderId(orderDto.getOrderId())
+                .userId(orderDto.getUserId())
+                .produceId(orderDto.getProductId())
+                .quantity(orderDto.getQuantity())
+                .unitPrice(orderDto.getUnitPrice())
+                .totalPrice(orderDto.getTotalPrice())
+                .build();
+        KafkaOrderDto kafkaOrderDto = new KafkaOrderDto(schema, payload);
+        ObjectMapper mapper = new ObjectMapper();
+        String jsonString = Strings.EMPTY;
+        try {
+            jsonString = mapper.writeValueAsString(kafkaOrderDto);
+        } catch (JsonProcessingException e) {
+            e.printStackTrace();
+        }
+        kafkaTemplate.send(topic, jsonString);
+        log.info("order Producer sent data from the order microservice: {}", kafkaOrderDto);
+        return orderDto;
+    }
+}
+```
+
+4. Kafka Sink Connector 추가
+
+3단계에서 만든 OrderProducer의 데이터를 받아서 DB에 저장할 `Sink Connector`를 생성한다.
+
+![](image/create-orders-sink-connectors.png)
+
+5. Controller 수정
+
+주문 정보를 저장하는 POST /orders API를 수정하여 위에서 만든 OrderProducer를 통하여 `Kafka` 토픽에 데이터를 전송하도록 수정한다.
+
+```java
+@RestController
+@RequiredArgsConstructor
+@RequestMapping("/order-service")
+public class OrderController {
+    private final Environment environment;
+    private final OrderService orderService;
+    private final KafkaProducer kafkaProducer;
+    private final OrderProducer orderProducer;
+    // 생략
+    @PostMapping("/{userId}/orders")
+    public ResponseEntity<OrderResponse> createOrder(@PathVariable("userId") String userId,
+                                                     @RequestBody OrderSaveRequest request) {
+        OrderDto orderDto = toObject(request, OrderDto.class);
+        orderDto.setUserId(userId);
+        // Using MariaDB Connector
+        // OrderDto savedOrder = orderService.createOrder(orderDto);
+        // OrderResponse response = toObject(savedOrder, OrderResponse.class);
+        // Using Kafka
+        orderDto.setOrderId(UUID.randomUUID().toString());
+        orderDto.setTotalPrice(request.getQuantity() * request.getUnitPrice());
+        OrderResponse response = toObject(orderDto, OrderResponse.class);
+        kafkaProducer.send("example-catalog-topic", orderDto);
+        orderProducer.send("orders", orderDto);
+        return ResponseEntity.status(HttpStatus.CREATED).body(response);
+    }
+    // 생략
+}
+```
+
+6. 테스트
+
+두 개의 `주문 서비스`를 실행한다.
+필자의 경우 Multirun 설정을 통하여 한 번에 두개의 `주문 서비스`를 실행하였다.
+필자가 Multirun 설정을 하기위해 참고한 자료는 글의 하단부에 첨부하였다.
+
+![](image/setup-multirun.png)
+
+`Discovery` 서버에 접속하여 주문 서비스의 IP 주소를 확인한다.
+
+![](image/user-service-1.png)
+
+![](image/user-service-2.png)
+
+필자의 경우 `192.168.0.2:60727`과 `192.168.0.2:60714`로 확인된다.
+
+Postman을 통해서 `Gateway`를 통하지않고 바로 `주문 서비스`의 주문 생성 API를 요청한다.
+
+![](image/save-order-direct-1.png)
+
+![](image/save-order-direct-2.png)
+
+h2-console에 접속하여 정상적으로 두 개의 주문 정보가 생성되었는지 확인한다.
+
+![](image/check-h2-console-save-orders.png)
+
+---
+
+지금까지 `Kafka Sink Connect`를 사용하여 다중 마이크로서비스 환경에서 단일 DB에 데이터를 동기화하는 방법에 대해서 알아보았다.
+
+---
+
+**참고한 강의:**
+
+- https://www.inflearn.com/course/%EC%8A%A4%ED%94%84%EB%A7%81-%ED%81%B4%EB%9D%BC%EC%9A%B0%EB%93%9C-%EB%A7%88%EC%9D%B4%ED%81%AC%EB%A1%9C%EC%84%9C%EB%B9%84%EC%8A%A4
+
+**참고한 자료:**
+
+- [@JsonProperty, @JsonNaming](https://zzang9ha.tistory.com/380)
+- [Multirun 설정](https://jojoldu.tistory.com/510)
\ No newline at end of file
diff --git a/order-service/build.gradle b/order-service/build.gradle
index 5ff6f0b..b72a2e5 100644
--- a/order-service/build.gradle
+++ b/order-service/build.gradle
@@ -1,6 +1,7 @@
 dependencies {
     implementation(project(":util"))
 
+    implementation 'org.mariadb.jdbc:mariadb-java-client:3.0.4'
     implementation 'org.springframework.kafka:spring-kafka'
     implementation 'org.springframework.boot:spring-boot-starter-web'
     implementation 'org.springframework.boot:spring-boot-starter-validation'
@@ -24,6 +25,10 @@ dependencyManagement {
     }
 }
 
+repositories {
+    mavenCentral()
+}
+
 tasks.named('test') {
     useJUnitPlatform()
 }
diff --git a/order-service/src/main/java/com/roy/springcloud/orderservice/controller/OrderController.java b/order-service/src/main/java/com/roy/springcloud/orderservice/controller/OrderController.java
index 2f51af0..29ae7d6 100644
--- a/order-service/src/main/java/com/roy/springcloud/orderservice/controller/OrderController.java
+++ b/order-service/src/main/java/com/roy/springcloud/orderservice/controller/OrderController.java
@@ -1,6 +1,8 @@
 package com.roy.springcloud.orderservice.controller;
 
 import com.roy.springcloud.orderservice.dto.OrderDto;
+import com.roy.springcloud.orderservice.service.KafkaProducer;
+import com.roy.springcloud.orderservice.service.OrderProducer;
 import com.roy.springcloud.orderservice.service.OrderService;
 import com.roy.springcloud.orderservice.vo.request.OrderSaveRequest;
 import com.roy.springcloud.orderservice.vo.response.OrderResponse;
@@ -11,6 +13,7 @@ import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
 
 import java.util.List;
+import java.util.UUID;
 import java.util.stream.Collectors;
 
 import static com.roy.springcloud.util.mapper.MapperUtil.toObject;
@@ -21,6 +24,8 @@ import static com.roy.springcloud.util.mapper.MapperUtil.toObject;
 public class OrderController {
     private final Environment environment;
     private final OrderService orderService;
+    private final KafkaProducer kafkaProducer;
+    private final OrderProducer orderProducer;
 
     @GetMapping("/health-check")
     public String healthCheck() {
@@ -33,8 +38,15 @@ public class OrderController {
                                                      @RequestBody OrderSaveRequest request) {
         OrderDto orderDto = toObject(request, OrderDto.class);
         orderDto.setUserId(userId);
-        OrderDto savedOrder = orderService.createOrder(orderDto);
-        OrderResponse response = toObject(savedOrder, OrderResponse.class);
+        // Using MariaDB Connector
+        // OrderDto savedOrder = orderService.createOrder(orderDto);
+        // OrderResponse response = toObject(savedOrder, OrderResponse.class);
+        // Using Kafka
+        orderDto.setOrderId(UUID.randomUUID().toString());
+        orderDto.setTotalPrice(request.getQuantity() * request.getUnitPrice());
+        OrderResponse response = toObject(orderDto, OrderResponse.class);
+        kafkaProducer.send("example-catalog-topic", orderDto);
+        orderProducer.send("orders", orderDto);
         return ResponseEntity.status(HttpStatus.CREATED).body(response);
     }
 
diff --git a/order-service/src/main/java/com/roy/springcloud/orderservice/dto/Field.java b/order-service/src/main/java/com/roy/springcloud/orderservice/dto/Field.java
new file mode 100644
index 0000000..97ec08f
--- /dev/null
+++ b/order-service/src/main/java/com/roy/springcloud/orderservice/dto/Field.java
@@ -0,0 +1,14 @@
+package com.roy.springcloud.orderservice.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+
+@Data
+@Builder
+@AllArgsConstructor
+public class Field {
+    private String type;
+    private boolean optional;
+    private String field;
+}
diff --git a/order-service/src/main/java/com/roy/springcloud/orderservice/dto/KafkaOrderDto.java b/order-service/src/main/java/com/roy/springcloud/orderservice/dto/KafkaOrderDto.java
new file mode 100644
index 0000000..97002b5
--- /dev/null
+++ b/order-service/src/main/java/com/roy/springcloud/orderservice/dto/KafkaOrderDto.java
@@ -0,0 +1,15 @@
+package com.roy.springcloud.orderservice.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+
+import java.io.Serializable;
+
+@Data
+@Builder
+@AllArgsConstructor
+public class KafkaOrderDto implements Serializable {
+    private Schema schema;
+    private Payload payload;
+}
diff --git a/order-service/src/main/java/com/roy/springcloud/orderservice/dto/Payload.java b/order-service/src/main/java/com/roy/springcloud/orderservice/dto/Payload.java
new file mode 100644
index 0000000..8e5c45e
--- /dev/null
+++ b/order-service/src/main/java/com/roy/springcloud/orderservice/dto/Payload.java
@@ -0,0 +1,22 @@
+package com.roy.springcloud.orderservice.dto;
+
+import com.fasterxml.jackson.databind.PropertyNamingStrategies;
+import com.fasterxml.jackson.databind.annotation.JsonNaming;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+
+import java.io.Serializable;
+
+@Data
+@Builder
+@AllArgsConstructor
+@JsonNaming(PropertyNamingStrategies.SnakeCaseStrategy.class)
+public class Payload implements Serializable {
+    private String orderId;
+    private String userId;
+    private String productId;
+    private int quantity;
+    private int totalPrice;
+    private int unitPrice;
+}
diff --git a/order-service/src/main/java/com/roy/springcloud/orderservice/dto/Schema.java b/order-service/src/main/java/com/roy/springcloud/orderservice/dto/Schema.java
new file mode 100644
index 0000000..7a8cae0
--- /dev/null
+++ b/order-service/src/main/java/com/roy/springcloud/orderservice/dto/Schema.java
@@ -0,0 +1,17 @@
+package com.roy.springcloud.orderservice.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+
+import java.util.List;
+
+@Data
+@Builder
+@AllArgsConstructor
+public class Schema {
+    private String type;
+    private List<Field> fields;
+    private boolean optional;
+    private String name;
+}
diff --git a/order-service/src/main/java/com/roy/springcloud/orderservice/service/OrderProducer.java b/order-service/src/main/java/com/roy/springcloud/orderservice/service/OrderProducer.java
new file mode 100644
index 0000000..85ca09b
--- /dev/null
+++ b/order-service/src/main/java/com/roy/springcloud/orderservice/service/OrderProducer.java
@@ -0,0 +1,7 @@
+package com.roy.springcloud.orderservice.service;
+
+import com.roy.springcloud.orderservice.dto.OrderDto;
+
+public interface OrderProducer {
+    OrderDto send(String topic, OrderDto orderDto);
+}
diff --git a/order-service/src/main/java/com/roy/springcloud/orderservice/service/impl/OrderProducerImpl.java b/order-service/src/main/java/com/roy/springcloud/orderservice/service/impl/OrderProducerImpl.java
new file mode 100644
index 0000000..b191a1a
--- /dev/null
+++ b/order-service/src/main/java/com/roy/springcloud/orderservice/service/impl/OrderProducerImpl.java
@@ -0,0 +1,58 @@
+package com.roy.springcloud.orderservice.service.impl;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.roy.springcloud.orderservice.dto.*;
+import com.roy.springcloud.orderservice.service.OrderProducer;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.logging.log4j.util.Strings;
+import org.springframework.kafka.core.KafkaTemplate;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class OrderProducerImpl implements OrderProducer {
+    private final KafkaTemplate<String, String> kafkaTemplate;
+
+    private List<Field> fields = List.of(
+            new Field("string", true, "order_id"),
+            new Field("string", true, "user_id"),
+            new Field("string", true, "product_id"),
+            new Field("int32", true, "quantity"),
+            new Field("int32", true, "total_price"),
+            new Field("int32", true, "unit_price"));
+    private Schema schema = Schema.builder()
+            .type("struct")
+            .fields(fields)
+            .optional(false)
+            .name("orders")
+            .build();
+
+    @Override
+    public OrderDto send(String topic, OrderDto orderDto) {
+        Payload payload = Payload.builder()
+                .orderId(orderDto.getOrderId())
+                .userId(orderDto.getUserId())
+                .productId(orderDto.getProductId())
+                .quantity(orderDto.getQuantity())
+                .unitPrice(orderDto.getUnitPrice())
+                .totalPrice(orderDto.getTotalPrice())
+                .build();
+
+        KafkaOrderDto kafkaOrderDto = new KafkaOrderDto(schema, payload);
+        ObjectMapper mapper = new ObjectMapper();
+        String jsonString = Strings.EMPTY;
+        try {
+            jsonString = mapper.writeValueAsString(kafkaOrderDto);
+        } catch (JsonProcessingException e) {
+            e.printStackTrace();
+        }
+        kafkaTemplate.send(topic, jsonString);
+        log.info("order Producer sent data from the order microservice: {}", kafkaOrderDto);
+        return orderDto;
+    }
+}
diff --git a/order-service/src/main/resources/application.yml b/order-service/src/main/resources/application.yml
index 23efa58..426770b 100644
--- a/order-service/src/main/resources/application.yml
+++ b/order-service/src/main/resources/application.yml
@@ -14,8 +14,12 @@ spring:
     hibernate:
       ddl-auto: update
   datasource:
-    driver-class-name: org.h2.Driver
-    url: jdbc:h2:mem:testdb
+    driver-class-name: org.mariadb.jdbc.Driver
+    url: jdbc:mariadb://localhost:3306/mydb
+    username: root
+    password: root
+#    driver-class-name: org.h2.Driver
+#    url: jdbc:h2:mem:testdb
 
 eureka:
   instance: