diff --git a/docker-compose-mattermost.yml b/docker-compose-mattermost.yml
new file mode 100644
index 0000000..89e01d4
--- /dev/null
+++ b/docker-compose-mattermost.yml
@@ -0,0 +1,88 @@
+version: "3.8"
+
+services:
+  # Mattermost Team Edition
+  mattermost:
+    image: mattermost/mattermost-team-edition:latest
+    container_name: mattermost
+    hostname: mattermost
+    ports:
+      - "8065:8065"
+    environment:
+      # 数据库配置
+      MM_SQLSETTINGS_DRIVERNAME: "postgres"
+      MM_SQLSETTINGS_DATASOURCE: "postgres://mattermost:mattermost_password@postgres:5432/mattermost?sslmode=disable&connect_timeout=10"
+      
+      # 服务配置
+      MM_SERVICESETTINGS_SITEURL: "http://localhost:8065"
+      MM_SERVICESETTINGS_LISTENADDRESS: ":8065"
+      MM_SERVICESETTINGS_ENABLEDEVELOPER: "true"
+      
+      # 文件存储配置
+      MM_FILESETTINGS_DRIVERNAME: "local"
+      MM_FILESETTINGS_DIRECTORY: "/mattermost/data/"
+      
+      # 日志配置
+      MM_LOGSETTINGS_ENABLECONSOLE: "true"
+      MM_LOGSETTINGS_CONSOLELEVEL: "INFO"
+      
+      # 用户配置
+      MM_TEAMSETTINGS_ENABLEUSERCREATION: "true"
+      MM_TEAMSETTINGS_ENABLEOPENSERVER: "true"
+      MM_SERVICESETTINGS_ENABLEEMAILINVITATIONS: "false"
+      
+      # 安全配置
+      MM_SERVICESETTINGS_ENABLEINSECUREOUTGOINGCONNECTIONS: "true"
+      
+      # 插件配置
+      MM_PLUGINSETTINGS_ENABLE: "true"
+      MM_PLUGINSETTINGS_ENABLEUPLOADS: "true"
+    depends_on:
+      postgres:
+        condition: service_healthy
+    networks:
+      - mattermost_network
+    volumes:
+      - mattermost_data:/mattermost/data
+      - mattermost_config:/mattermost/config
+      - mattermost_logs:/mattermost/logs
+      - mattermost_plugins:/mattermost/plugins
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8065/api/v4/system/ping"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 90s
+
+  # PostgreSQL数据库
+  postgres:
+    image: postgres:13-alpine
+    container_name: mattermost_postgres
+    environment:
+      POSTGRES_DB: mattermost
+      POSTGRES_USER: mattermost
+      POSTGRES_PASSWORD: mattermost_password
+      POSTGRES_INITDB_ARGS: "--encoding=UTF8 --lc-collate=C --lc-ctype=C"
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    networks:
+      - mattermost_network
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U mattermost -d mattermost"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 30s
+
+networks:
+  mattermost_network:
+    driver: bridge
+
+volumes:
+  mattermost_data:
+  mattermost_config:
+  mattermost_logs:
+  mattermost_plugins:
+  postgres_data:
diff --git a/step.md b/step.md
index 8667ff4..232e740 100644
--- a/step.md
+++ b/step.md
@@ -6,4 +6,44 @@ docker exec openldap ldapadd -x -D "cn=admin,dc=example,dc=com" -w admin -f /tmp
 
 ldap
 用户DN: cn=admin,dc=example,dc=com
-密码: admin
\ No newline at end of file
+密码: admin
+
+
+
+RDN 是 Relative Distinguished Name（相对可分辨名称）的缩写，是LDAP中的一个重要概念。
+
+RDN 解释
+1. 什么是RDN
+   RDN 是LDAP条目在其父容器中的唯一标识符
+   它是DN（Distinguished Name）的最左边部分
+   类似于文件系统中的文件名
+2. 举例说明
+   完整DN: uid=Guwan,ou=people,dc=example,dc=com
+
+RDN: uid=Guwan （最左边的部分）
+父DN: ou=people,dc=example,dc=com
+3. 常见的RDN格式
+   RDN格式	含义	用途
+   uid=john	User ID	用户账户
+   cn=John Doe	Common Name	人员或组
+   ou=people	Organizational Unit	组织单位
+   dc=example	Domain Component	域名组件
+4. 在您的情况下
+   当您创建用户时，系统会问您要使用什么作为RDN：
+
+选择 uid: 创建 uid=Guwan,ou=people,dc=example,dc=com
+选择 cn: 创建 cn=Guwan,ou=people,dc=example,dc=com
+5. 为什么重要
+   唯一性: 同一容器中不能有相同的RDN
+   引用: 其他系统（如GitLab）通过RDN来识别用户
+   搜索: LDAP搜索时RDN是重要的查找依据
+6. 在创建用户界面中
+   当您看到RDN选择时：
+
+选择 uid 如果您想要 uid=Guwan 格式
+选择 cn 如果您想要 cn=Guwan 格式
+对于GitLab LDAP集成，通常推荐使用 uid 作为RDN，因为：
+
+更符合用户账户的标准
+GitLab配置中使用 uid 字段进行认证
+与其他现有用户（uid=bob.wilson 等）保持一致
\ No newline at end of file