diff --git a/.github/workflows/cicd_production.yml b/.github/workflows/cicd_production.yml
index 201b7151..84229c6c 100644
--- a/.github/workflows/cicd_production.yml
+++ b/.github/workflows/cicd_production.yml
@@ -55,6 +55,15 @@ jobs:
           gradle-version: 8.7
           arguments: clean build -x test
 
+      # 실제 필요한 파일(Jar, appspect.yml, 배포 스크립트)만 담기
+      - name: zip 파일 생성
+        run: |
+          mkdir -p deploy/scripts
+          cp scripts/*.sh deploy/scripts
+          cp appspec.yml deploy/
+          cp build/libs/*.jar deploy/
+          cd deploy && zip -r ./$GITHUB_SHA.zip *
+        shell: bash
 
       # (5) AWS 인증 (IAM 사용자 Access Key, Secret Key 활용)
       - name: Configure AWS credentials
@@ -68,11 +77,8 @@ jobs:
       # (6) 빌드 결과물을 S3 버킷에 업로드
       - name: Upload to AWS S3
         run: |
-          aws deploy push \
-            --application-name ${{ env.CODE_DEPLOY_APPLICATION_NAME }} \
-            --ignore-hidden-files \
-            --s3-location s3://$S3_BUCKET_NAME/$GITHUB_SHA.zip \
-            --source .
+          aws s3 cp deploy/$GITHUB_SHA.zip s3://$S3_BUCKET_NAME/$GITHUB_SHA.zip
+
 
       # (7) S3 버킷에 있는 파일을 대상으로 CodeDeploy 실행
       - name: Deploy to AWS EC2 from S3
diff --git a/appspec.yml b/appspec.yml
index 12923539..011e1345 100644
--- a/appspec.yml
+++ b/appspec.yml
@@ -3,7 +3,7 @@ os: linux
 
 files:
   - source:  /
-    destination: /home/ubuntu/app
+    destination: /home/ubuntu/app/step3/zip/
     overwrite: yes
 
 permissions:
@@ -14,11 +14,14 @@ permissions:
 
 hooks:
   AfterInstall:
-    - location: scripts/stop.sh
+    - location: scripts/stop.sh # 엔진엑스와 연결되어 있지 않은 스프링 부트를 종료합니다.
       timeout: 60
       runas: ubuntu
   ApplicationStart:
-    - location: scripts/start.sh
+    - location: scripts/start.sh  # 엔진엑스와 연결되어 있지 않은 Port로 새 버전의 스프링 부트를 시작합니다.
+      timeout: 60
+      runas: ubuntu
+  ValidateService:
+    - location: scripts/health.sh # 새 스프링 부트가 정상적으로 실행됐는지 확인합니다.
       timeout: 60
       runas: ubuntu
-
diff --git a/build.gradle b/build.gradle
index d045f4ba..44f07282 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,7 +5,7 @@ plugins {
 }
 
 group = 'com.nawabali'
-version = '0.0.1-SNAPSHOT'
+version = '1.0.1-SNAPSHOT-' + new Date().format("yyyy-MM-dd-HHmmss")
 
 java {
 	sourceCompatibility = '17'
@@ -103,7 +103,7 @@ test {
 	useJUnitPlatform()
 }
 
-//// 빌드 시 plain jar 파일은 만들어지지 않기 위해 추가
-//jar {
-//	enabled = false
-//}
\ No newline at end of file
+// plain jar 생성되지 않게 설정
+jar {
+	enabled = false
+}
\ No newline at end of file
diff --git a/scripts/health.sh b/scripts/health.sh
new file mode 100644
index 00000000..f74b9ce7
--- /dev/null
+++ b/scripts/health.sh
@@ -0,0 +1,39 @@
+#!/usr/bin/env bash
+
+ABSPATH=$(readlink -f $0)
+ABSDIR=$(dirname $ABSPATH)
+source ${ABSDIR}/profile.sh
+source ${ABSDIR}/switch.sh
+
+IDLE_PORT=$(find_idle_port)
+
+echo "> Health Check Start!"
+echo "> IDLE_PORT: $IDLE_PORT"
+echo "> curl -s http://127.0.0.1:$IDLE_PORT/profile "
+sleep 10
+
+for RETRY_COUNT in {1..10}
+do
+  RESPONSE=$(curl -s http://127.0.0.1:${IDLE_PORT}/profile)
+  UP_COUNT=$(echo ${RESPONSE} | grep 'real' | wc -l)
+
+  if [ ${UP_COUNT} -ge 1 ]
+  then # $up_count >= 1 ("real" 문자열이 있는지 검증)
+      echo "> Health check 성공"
+      switch_proxy
+      break
+  else
+      echo "> Health check의 응답을 알 수 없거나 혹은 실행 상태가 아닙니다."
+      echo "> Health check: ${RESPONSE}"
+  fi
+
+  if [ ${RETRY_COUNT} -eq 10 ]
+  then
+    echo "> Health check 실패. "
+    echo "> 엔진엑스에 연결하지 않고 배포를 종료합니다."
+    exit 1
+  fi
+
+  echo "> Health check 연결 실패. 재시도..."
+  sleep 10
+done
\ No newline at end of file
diff --git a/scripts/profile.sh b/scripts/profile.sh
new file mode 100644
index 00000000..9706c0f9
--- /dev/null
+++ b/scripts/profile.sh
@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+
+# bash는 return value가 안되니 *제일 마지막줄에 echo로 해서 결과 출력*후, 클라이언트에서 값을 사용한다
+
+# 쉬고 있는 profile 찾기: real1이 사용중이면 real2가 쉬고 있고, 반대면 real1이 쉬고 있음
+function find_idle_profile()
+{
+    RESPONSE_CODE=$(curl -s -o /dev/null -w "%{http_code}" http://127.0.0.1/profile)
+
+    if [ ${RESPONSE_CODE} -ge 400 ] # 400 보다 크면 (즉, 40x/50x 에러 모두 포함)
+    then
+        CURRENT_PROFILE=real2
+    else
+        CURRENT_PROFILE=$(curl -s http://127.0.0.1/profile)
+    fi
+
+    if [ ${CURRENT_PROFILE} == real1 ]
+    then
+      IDLE_PROFILE=real2
+    else
+      IDLE_PROFILE=real1
+    fi
+
+    echo "${IDLE_PROFILE}"
+}
+
+# 쉬고 있는 profile의 port 찾기
+function find_idle_port()
+{
+    IDLE_PROFILE=$(find_idle_profile)
+
+    if [ ${IDLE_PROFILE} == real1 ]
+    then
+      echo "8081"
+    else
+      echo "8082"
+    fi
+}
\ No newline at end of file
diff --git a/scripts/start.sh b/scripts/start.sh
index 51663229..d3cb5b04 100644
--- a/scripts/start.sh
+++ b/scripts/start.sh
@@ -1,21 +1,42 @@
 #!/usr/bin/env bash
 
-PROJECT_ROOT="/home/ubuntu/app"
-JAR_FILE="$PROJECT_ROOT/build/libs/nawabali-0.0.1-SNAPSHOT.jar"
+ABSPATH=$(readlink -f $0)
+ABSDIR=$(dirname $ABSPATH)
+source ${ABSDIR}/profile.sh
 
-APP_LOG="$PROJECT_ROOT/application.log"
-ERROR_LOG="$PROJECT_ROOT/error.log"
-DEPLOY_LOG="$PROJECT_ROOT/deploy.log"
+REPOSITORY=/home/ubuntu/app/step3
+PROJECT_NAME=ZeroDowntimeDeployment
+DEPLOY_LOG="$REPOSITORY/deploy.log"
 
 TIME_NOW=$(date +%c)
 
-# build 파일 복사
-echo "$TIME_NOW > $JAR_FILE 파일 복사" >> $DEPLOY_LOG
-cp $PROJECT_ROOT/build/libs/*.jar $JAR_FILE
+echo "> Build 파일 복사"
+echo "> cp $REPOSITORY/zip/*.jar $REPOSITORY/"
 
-# jar 파일 실행
-echo "$TIME_NOW > $JAR_FILE 파일 실행" >> $DEPLOY_LOG
-nohup java -jar $JAR_FILE > $APP_LOG 2> $ERROR_LOG &
+cp $REPOSITORY/zip/*.jar $REPOSITORY/
 
-CURRENT_PID=$(pgrep -f $JAR_FILE)
-echo "$TIME_NOW > 실행된 프로세스 아이디 $CURRENT_PID 입니다." >> $DEPLOY_LOG
+echo "> 새 어플리케이션 배포"
+JAR_NAME=$(ls -tr $REPOSITORY/*.jar | tail -n 1)
+
+echo "> JAR Name: $JAR_NAME"
+
+echo "> $JAR_NAME 에 실행권한 추가"
+
+chmod +x $JAR_NAME
+
+echo "> $JAR_NAME 실행"
+
+IDLE_PROFILE=$(find_idle_profile)
+
+echo "> $JAR_NAME 를 profile=$IDLE_PROFILE 로 실행합니다."
+
+# 쉬고 있던 프로필로 jar파일을 백그라운드 실행
+nohup java -jar \
+    -Dspring.config.location="classpath:/application.properties, classpath:/application-$IDLE_PROFILE.properties" \
+    -Dspring.profiles.active=$IDLE_PROFILE \
+    $JAR_NAME > $REPOSITORY/application.log 2>&1 &
+
+# Deploy 로그
+echo "$TIME_NOW > $JAR_NAME 파일 실행" >> $DEPLOY_LOG
+CURRENT_PID=$(pgrep -f $JAR_NAME)
+echo "$TIME_NOW > 실행된 프로세스 아이디 $CURRENT_PID 입니다." >> $DEPLOY_LOG
\ No newline at end of file
diff --git a/scripts/stop.sh b/scripts/stop.sh
index e4e87401..fcf1f1b0 100644
--- a/scripts/stop.sh
+++ b/scripts/stop.sh
@@ -1,19 +1,23 @@
 #!/usr/bin/env bash
 
-PROJECT_ROOT="/home/ubuntu/app"
-JAR_FILE="$PROJECT_ROOT/build/libs/nawabali-0.0.1-SNAPSHOT.jar"
-
-DEPLOY_LOG="$PROJECT_ROOT/deploy.log"
+ABSPATH=$(readlink -f $0)
+ABSDIR=$(dirname $ABSPATH)
+source ${ABSDIR}/profile.sh
 
+IDLE_PORT=$(find_idle_port)
 TIME_NOW=$(date +%c)
+DEPLOY_LOG="/home/ubuntu/app/step3/deploy.log"
 
-# 현재 구동 중인 애플리케이션 pid 확인
-CURRENT_PID=$(pgrep -f $JAR_FILE)
+echo "> $IDLE_PORT 에서 구동중인 애플리케이션 pid 확인"
+IDLE_PID=$(lsof -ti tcp:${IDLE_PORT})
 
-# 프로세스가 켜져 있으면 종료
-if [ -z $CURRENT_PID ]; then
+if [ -z ${IDLE_PID} ]
+then
   echo "$TIME_NOW > 현재 실행중인 애플리케이션이 없습니다" >> $DEPLOY_LOG
+  echo "> 현재 구동중인 애플리케이션이 없으므로 종료하지 않습니다."
 else
-  echo "$TIME_NOW > 실행중인 $CURRENT_PID 애플리케이션 종료 " >> $DEPLOY_LOG
-  kill -15 $CURRENT_PID
-fi
+  echo "$TIME_NOW > 실행중인 $IDLE_PID 애플리케이션 종료 " >> $DEPLOY_LOG
+  echo "> kill -15 $IDLE_PID"
+  kill -15 ${IDLE_PID}
+  sleep 5
+fi
\ No newline at end of file
diff --git a/scripts/switch.sh b/scripts/switch.sh
new file mode 100644
index 00000000..b8054928
--- /dev/null
+++ b/scripts/switch.sh
@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+ABSPATH=$(readlink -f $0)
+ABSDIR=$(dirname $ABSPATH)
+source ${ABSDIR}/profile.sh
+
+function switch_proxy() {
+    IDLE_PORT=$(find_idle_port)
+
+    echo "> 전환할 Port: $IDLE_PORT"
+    echo "> Port 전환"
+    echo "set \$service_url http://15.165.121.186:${IDLE_PORT};" | sudo tee /etc/nginx/conf.d/service-url.inc
+
+    echo "> 엔진엑스 Reload"
+    sudo service nginx reload
+}
\ No newline at end of file
diff --git a/src/main/java/com/nawabali/nawabali/HelloController.java b/src/main/java/com/nawabali/nawabali/HelloController.java
index 1cf914e3..28a8a82c 100644
--- a/src/main/java/com/nawabali/nawabali/HelloController.java
+++ b/src/main/java/com/nawabali/nawabali/HelloController.java
@@ -7,6 +7,6 @@
 public class HelloController {
     @GetMapping("/ping")
     public String check() {
-        return "Pong!";
+        return "Pong! Zero-Downtime deployment succeeded";
     }
 }
diff --git a/src/main/java/com/nawabali/nawabali/ProfileController.java b/src/main/java/com/nawabali/nawabali/ProfileController.java
new file mode 100644
index 00000000..36b58ddb
--- /dev/null
+++ b/src/main/java/com/nawabali/nawabali/ProfileController.java
@@ -0,0 +1,27 @@
+package com.nawabali.nawabali;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.core.env.Environment;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.Arrays;
+import java.util.List;
+
+@RequiredArgsConstructor
+@RestController
+public class ProfileController {
+    private final Environment env;
+
+    @GetMapping("/profile")
+    public String profile() {
+        // 현재 실행 중인 ActiveProfile을 모두 가져옵니다.
+        List<String> profiles = Arrays.asList(env.getActiveProfiles());
+        List<String> realProfiles = Arrays.asList("real1", "real2");
+        String defaultProfile = profiles.isEmpty()? "default" : profiles.get(0);
+        return profiles.stream()
+                .filter(realProfiles::contains)
+                .findAny()
+                .orElse(defaultProfile);
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/com/nawabali/nawabali/config/WebSecurityConfig.java b/src/main/java/com/nawabali/nawabali/config/WebSecurityConfig.java
index 0e536c65..373abe83 100644
--- a/src/main/java/com/nawabali/nawabali/config/WebSecurityConfig.java
+++ b/src/main/java/com/nawabali/nawabali/config/WebSecurityConfig.java
@@ -99,7 +99,7 @@ public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Excepti
                         .requestMatchers("/").permitAll() // 메인 페이지 요청 허가
                         .requestMatchers("/users/logout").permitAll()
                         .requestMatchers("/main.html").permitAll() // 메인 html페이지 요청 허가
-                        .requestMatchers("/ping").permitAll() // 항상 200 OK 반환하는 health check 전용 API
+                        .requestMatchers("/ping", "/profile").permitAll() // 항상 200 OK 반환하는 health check 전용 API
                         .requestMatchers("/users/signup").permitAll()
                         .requestMatchers(HttpMethod.POST, "/users/login").permitAll()
                         .requestMatchers("/posts").permitAll()