Add environment configuration and documentation for various services

- Created .env.example files for Kafka, Kibana, KodBox, Kong, Langfuse, Logstash, n8n, Nginx, OceanBase, OpenCoze, RocketMQ, TiDB, and TiKV.
- Added README.md and README.zh.md files for OceanBase, RocketMQ, TiDB, and TiKV, detailing usage, configuration, and access instructions.
- Implemented docker-compose.yaml files for OceanBase, RocketMQ, TiDB, and TiKV, defining service configurations, health checks, and resource limits.
- Included broker.conf for RocketMQ to specify broker settings.
- Established a consistent timezone (UTC) across all services.
- Provided optional port overrides in .env.example files for flexibility in deployment.

src/flink/.env.example

@@ -0,0 +1,9 @@
+# Flink version
+FLINK_VERSION=1.20.0-scala_2.12-java11
+
+# Timezone
+TZ=UTC
+
+# Port overrides (optional)
+# FLINK_JOBMANAGER_RPC_PORT_OVERRIDE=6123
+# FLINK_JOBMANAGER_UI_PORT_OVERRIDE=8081

src/flink/README.md

@@ -0,0 +1,104 @@
+# Apache Flink
+
+Apache Flink is a framework and distributed processing engine for stateful computations over unbounded and bounded data streams.
+
+## Usage
+
+```bash
+docker compose up -d
+```
+
+## Components
+
+This setup includes:
+
+- **JobManager**: Coordinates Flink jobs and manages resources
+- **TaskManager**: Executes tasks and manages data streams
+
+## Configuration
+
+Key environment variables in `FLINK_PROPERTIES`:
+
+- `jobmanager.rpc.address`: JobManager RPC address
+- `jobmanager.memory.process.size`: JobManager memory (default: 1600m)
+- `taskmanager.memory.process.size`: TaskManager memory (default: 1600m)
+- `taskmanager.numberOfTaskSlots`: Number of task slots per TaskManager (default: 2)
+
+## Ports
+
+- `6123`: JobManager RPC port
+- `8081`: Flink Web UI
+
+## Access
+
+### Web UI
+
+Access Flink Dashboard at: <http://localhost:8081>
+
+### Submit Jobs
+
+Submit a Flink job:
+
+```bash
+docker compose exec jobmanager ./bin/flink run /opt/flink/examples/streaming/WordCount.jar
+```
+
+Submit a custom job:
+
+```bash
+docker compose exec jobmanager ./bin/flink run /opt/flink/jobs/my-job.jar
+```
+
+### Job Management
+
+```bash
+# List running jobs
+docker compose exec jobmanager ./bin/flink list
+
+# Cancel a job
+docker compose exec jobmanager ./bin/flink cancel <job-id>
+
+# Show job details
+docker compose exec jobmanager ./bin/flink info /path/to/job.jar
+```
+
+## Example: WordCount
+
+Run the built-in WordCount example:
+
+```bash
+docker compose exec jobmanager ./bin/flink run /opt/flink/examples/streaming/WordCount.jar
+```
+
+## Scaling TaskManagers
+
+To scale TaskManagers for more processing capacity:
+
+```bash
+docker compose up -d --scale taskmanager=3
+```
+
+## Custom Jobs
+
+Mount your custom Flink jobs by uncommenting the volume in `docker-compose.yaml`:
+
+```yaml
+volumes:
+  - ./jobs:/opt/flink/jobs
+```
+
+Then place your JAR files in the `./jobs` directory.
+
+## Notes
+
+- This is a standalone cluster setup suitable for development
+- For production, consider using Flink on Kubernetes or YARN
+- Adjust memory settings based on your workload requirements
+- Task slots determine parallelism; more slots allow more parallel tasks
+- Data is persisted in the named volume `flink_data`
+
+## References
+
+- [Apache Flink Official Documentation](https://flink.apache.org/docs/stable/)
+- [Flink Docker Setup](https://nightlies.apache.org/flink/flink-docs-stable/docs/deployment/resource-providers/standalone/docker/)
+- [Flink Docker Hub](https://hub.docker.com/_/flink)

src/flink/README.zh.md

@@ -0,0 +1,104 @@
+# Apache Flink
+
+Apache Flink 是一个框架和分布式处理引擎，用于对无界和有界数据流进行有状态计算。
+
+## 使用方法
+
+```bash
+docker compose up -d
+```
+
+## 组件说明
+
+此配置包含：
+
+- **JobManager**：协调 Flink 作业并管理资源
+- **TaskManager**：执行任务并管理数据流
+
+## 配置说明
+
+`FLINK_PROPERTIES` 中的关键环境变量：
+
+- `jobmanager.rpc.address`：JobManager RPC 地址
+- `jobmanager.memory.process.size`：JobManager 内存（默认：1600m）
+- `taskmanager.memory.process.size`：TaskManager 内存（默认：1600m）
+- `taskmanager.numberOfTaskSlots`：每个 TaskManager 的任务槽数量（默认：2）
+
+## 端口说明
+
+- `6123`：JobManager RPC 端口
+- `8081`：Flink Web UI
+
+## 访问方式
+
+### Web UI
+
+访问 Flink Dashboard：<http://localhost:8081>
+
+### 提交作业
+
+提交 Flink 作业：
+
+```bash
+docker compose exec jobmanager ./bin/flink run /opt/flink/examples/streaming/WordCount.jar
+```
+
+提交自定义作业：
+
+```bash
+docker compose exec jobmanager ./bin/flink run /opt/flink/jobs/my-job.jar
+```
+
+### 作业管理
+
+```bash
+# 列出运行中的作业
+docker compose exec jobmanager ./bin/flink list
+
+# 取消作业
+docker compose exec jobmanager ./bin/flink cancel <job-id>
+
+# 显示作业详情
+docker compose exec jobmanager ./bin/flink info /path/to/job.jar
+```
+
+## 示例：WordCount
+
+运行内置的 WordCount 示例：
+
+```bash
+docker compose exec jobmanager ./bin/flink run /opt/flink/examples/streaming/WordCount.jar
+```
+
+## 扩展 TaskManager
+
+要扩展 TaskManager 以获得更多处理能力：
+
+```bash
+docker compose up -d --scale taskmanager=3
+```
+
+## 自定义作业
+
+通过取消注释 `docker-compose.yaml` 中的卷来挂载自定义 Flink 作业：
+
+```yaml
+volumes:
+  - ./jobs:/opt/flink/jobs
+```
+
+然后将 JAR 文件放在 `./jobs` 目录中。
+
+## 注意事项
+
+- 这是一个独立集群配置，适合开发环境
+- 生产环境建议在 Kubernetes 或 YARN 上使用 Flink
+- 根据工作负载需求调整内存设置
+- 任务槽决定并行度，更多槽允许更多并行任务
+- 数据持久化在命名卷 `flink_data` 中
+
+## 参考资料
+
+- [Apache Flink 官方文档](https://flink.apache.org/zh/docs/stable/)
+- [Flink Docker 设置](https://nightlies.apache.org/flink/flink-docs-stable/docs/deployment/resource-providers/standalone/docker/)
+- [Flink Docker Hub](https://hub.docker.com/_/flink)

src/flink/docker-compose.yaml

@@ -0,0 +1,78 @@
+x-default: &default
+  restart: unless-stopped
+  logging:
+    driver: json-file
+    options:
+      max-size: 100m
+      max-file: "3"
+
+services:
+  jobmanager:
+    <<: *default
+    image: flink:${FLINK_VERSION:-1.20.0-scala_2.12-java11}
+    hostname: jobmanager
+    command: jobmanager
+    environment:
+      TZ: ${TZ:-UTC}
+      FLINK_PROPERTIES: |
+        jobmanager.rpc.address: jobmanager
+        jobmanager.memory.process.size: 1600m
+        taskmanager.memory.process.size: 1600m
+        taskmanager.numberOfTaskSlots: 2
+    volumes:
+      - flink_data:/opt/flink/data
+      # Custom Flink jobs
+      # - ./jobs:/opt/flink/jobs
+    ports:
+      - "${FLINK_JOBMANAGER_RPC_PORT_OVERRIDE:-6123}:6123"
+      - "${FLINK_JOBMANAGER_UI_PORT_OVERRIDE:-8081}:8081"
+    deploy:
+      resources:
+        limits:
+          cpus: '2.0'
+          memory: 2G
+        reservations:
+          cpus: '0.5'
+          memory: 1G
+    healthcheck:
+      test: ["CMD-SHELL", "wget --no-verbose --tries=1 --spider http://localhost:8081 || exit 1"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 30s
+
+  taskmanager:
+    <<: *default
+    image: flink:${FLINK_VERSION:-1.20.0-scala_2.12-java11}
+    command: taskmanager
+    environment:
+      TZ: ${TZ:-UTC}
+      FLINK_PROPERTIES: |
+        jobmanager.rpc.address: jobmanager
+        jobmanager.memory.process.size: 1600m
+        taskmanager.memory.process.size: 1600m
+        taskmanager.numberOfTaskSlots: 2
+    volumes:
+      - flink_data:/opt/flink/data
+      # Custom Flink jobs
+      # - ./jobs:/opt/flink/jobs
+    depends_on:
+      jobmanager:
+        condition: service_healthy
+    deploy:
+      resources:
+        limits:
+          cpus: '2.0'
+          memory: 2G
+        reservations:
+          cpus: '0.5'
+          memory: 1G
+    healthcheck:
+      test: ["CMD-SHELL", "ps aux | grep -v grep | grep -q taskmanager || exit 1"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 30s
+
+volumes:
+  flink_data: