diff --git a/docs/local-run.md b/docs/local-run.md
new file mode 100644
index 0000000..d18ae03
--- /dev/null
+++ b/docs/local-run.md
@@ -0,0 +1,27 @@
+# 로컬 실행
+
+## 1) 인프라 실행
+
+1. Docker Desktop 실행
+2. 프로젝트 루트에서 아래 명령 실행
+   - `docker compose up -d`
+
+기본 포트:
+- PostgreSQL: `localhost:5432`
+- Redis: `localhost:6379`
+
+## 2) 백엔드 실행
+
+- Windows: `.\gradlew bootRun`
+- Mac/Linux: `./gradlew bootRun`
+
+## 3) OAuth 로그인 테스트 (선택)
+
+- Google/Naver/Kakao 로그인 테스트가 필요하면 로컬 환경변수에
+  Client ID / Client Secret 값을 설정합니다.
+- 각자 본인 키를 사용하며, 실제 키 값은 git에 커밋하지 않습니다.
+
+## 참고
+
+- 기본 API 실행은 `application.yaml`의 local fallback 값으로 가능합니다.
+- `JWT_SECRET`도 local fallback이 있어 로컬 부팅 시 필수 입력이 아닙니다.
diff --git a/src/main/resources/application.yaml b/src/main/resources/application.yaml
index 5090c0c..c1d932a 100644
--- a/src/main/resources/application.yaml
+++ b/src/main/resources/application.yaml
@@ -19,15 +19,15 @@ spring:
       client:
         registration:
           google:
-            client-id: ${GOOGLE_CLIENT_ID}
-            client-secret: ${GOOGLE_CLIENT_SECRET}
+            client-id: ${GOOGLE_CLIENT_ID:dummy-google-client-id}
+            client-secret: ${GOOGLE_CLIENT_SECRET:dummy-google-client-secret}
             scope:
               - profile
               - email
 
           naver:
-            client-id: ${NAVER_CLIENT_ID}
-            client-secret: ${NAVER_CLIENT_SECRET}
+            client-id: ${NAVER_CLIENT_ID:dummy-naver-client-id}
+            client-secret: ${NAVER_CLIENT_SECRET:dummy-naver-client-secret}
             client-name: Naver
             authorization-grant-type: authorization_code
             redirect-uri: "{baseUrl}/login/oauth2/code/{registrationId}"
@@ -38,8 +38,8 @@ spring:
               - profile_image
 
           kakao:
-            client-id: ${KAKAO_CLIENT_ID}
-            client-secret: ${KAKAO_CLIENT_SECRET}
+            client-id: ${KAKAO_CLIENT_ID:dummy-kakao-client-id}
+            client-secret: ${KAKAO_CLIENT_SECRET:dummy-kakao-client-secret}
             client-authentication-method: client_secret_post
             client-name: Kakao
             authorization-grant-type: authorization_code
@@ -63,7 +63,7 @@ spring:
             user-name-attribute: id
 
 jwt:
-  secret: ${JWT_SECRET}
+  secret: ${JWT_SECRET:change-me-local-jwt-secret-key-32bytes!}
   access-token-expiration-seconds: 900
   refresh-token-expiration-seconds: 2592000
 
@@ -75,9 +75,9 @@ spring:
     import: optional:classpath:application-private.yaml
 
   datasource:
-    url: jdbc:postgresql://localhost:5432/zimdugo
-    username: ${DB_USERNAME}
-    password: ${DB_PASSWORD}
+    url: jdbc:postgresql://${DB_HOST:localhost}:${DB_PORT:5432}/${DB_NAME:zimdugo}
+    username: ${DB_USERNAME:zimdugo}
+    password: ${DB_PASSWORD:zimdugo}
     driver-class-name: org.postgresql.Driver
 
   data: