Cluster Deployment

This document provides detailed configuration steps and best practices for New API cluster deployment, helping you build a highly available, load-balanced distributed system.

Prerequisites

• Multiple servers (at least two, master-slave architecture)
• Docker and Docker Compose installed
• Shared MySQL database (master and slave nodes must access the same database)
• Shared Redis service (for inter-node data synchronization and caching)
• Optional: Load balancer (e.g., Nginx, HAProxy, or cloud provider's load balancing service)

Cluster Architecture Overview

The New API cluster adopts a master-slave architecture design:

1. Master Node: Responsible for handling all write operations and some read operations
2. Slave Nodes: Primarily responsible for handling read operations, improving overall system throughput

Key Cluster Deployment Configurations

The key to cluster deployment is that all nodes must:

1. Share the same database: All nodes access the same MySQL database
2. Share the same Redis: Used for caching and inter-node communication
3. Use the same keys: SESSION_SECRET and CRYPTO_SECRET must be identical across all nodes
4. Correctly configure node type: Master node as master, slave nodes as slave

Deployment Steps

Step One: Prepare Shared Database and Redis

First, you need to prepare shared MySQL database and Redis services. This can be:

• Separately deployed highly available MySQL and Redis services
• Managed database and caching services provided by cloud providers
• MySQL and Redis running on independent servers

For MySQL databases, you can choose from the following architectural solutions:

Ensure these services are accessible by all nodes and have sufficient performance and reliability.

Step Two: Configure Master Node

Create a docker-compose.yml file on the master node server:

services:
  new-api-master:
    image: calciumion/new-api:latest
    container_name: new-api-master
    restart: always
    ports:
      - '3000:3000'
    environment:
      - SQL_DSN=root:password@tcp(your-db-host:3306)/new-api
      - REDIS_CONN_STRING=redis://default:password@your-redis-host:6379
      - SESSION_SECRET=your_unique_session_secret
      - CRYPTO_SECRET=your_unique_crypto_secret
      - TZ=Asia/Shanghai
      # 以下是可选配置
      - SYNC_FREQUENCY=60 # 同步频率，单位秒
      - FRONTEND_BASE_URL=https://your-domain.com # 前端基础 URL，用于邮件通知等功能
    volumes:
      - ./data:/data
      - ./logs:/app/logs

Start the master node:

docker compose up -d

Step Three: Configure Slave Nodes

Create a docker-compose.yml file on each slave node server:

services:
  new-api-slave:
    image: calciumion/new-api:latest
    container_name: new-api-slave
    restart: always
    ports:
      - '3000:3000' # 可以与主节点使用相同端口，因为它们在不同服务器上
    environment:
      - SQL_DSN=root:password@tcp(your-db-host:3306)/new-api # 与主节点相同
      - REDIS_CONN_STRING=redis://default:password@your-redis-host:6379 # 与主节点相同
      - SESSION_SECRET=your_unique_session_secret # 必须与主节点相同
      - CRYPTO_SECRET=your_unique_crypto_secret # 必须与主节点相同
      - NODE_TYPE=slave # 关键配置，指定为从节点
      - SYNC_FREQUENCY=60 # 从节点与主节点同步频率，单位秒
      - TZ=Asia/Shanghai
      # 以下是可选配置
      - FRONTEND_BASE_URL=https://your-domain.com # 需与主节点相同
    volumes:
      - ./data:/data
      - ./logs:/app/logs

Start the slave node:

docker compose up -d

Repeat this step for each slave node server.

Step Four: Configure Load Balancer

To achieve balanced traffic distribution, you need to set up a load balancer. Below is a configuration example using Nginx as a load balancer:

upstream new_api_cluster {
    server master-node-ip:3000 weight=3;
    server slave-node1-ip:3000 weight=5;
    server slave-node2-ip:3000 weight=5;
    # 可添加更多从节点
}

server {
    listen 80;
    server_name your-domain.com;

    location / {
        proxy_pass http://new_api_cluster;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
    }
}

This configuration sets the master node weight to 3 and slave node weights to 5, meaning slave nodes will handle more requests. You can adjust these weights according to your actual needs.

Advanced Configuration Options

Data Synchronization Settings

Data synchronization between cluster nodes depends on the following environment variables:

Redis High Availability Configuration

To improve Redis availability, you can configure Redis Cluster or Sentinel mode:

environment:
  - REDIS_CONN_STRING=redis://your-redis-host:6379
  - REDIS_PASSWORD=your_redis_password
  - REDIS_MASTER_NAME=mymaster # 哨兵模式下的主节点名称
  - REDIS_CONN_POOL_SIZE=10 # Redis 连接池大小

Session Security Configuration

Ensure all nodes in the cluster use the same session and encryption keys:

environment:
  - SESSION_SECRET=your_unique_session_secret # 所有节点必须相同
  - CRYPTO_SECRET=your_unique_crypto_secret # 所有节点必须相同

Monitoring and Maintenance

Health Checks

Configure regular health checks to monitor node status:

healthcheck:
  test:
    [
      'CMD-SHELL',
      "wget -q -O - http://localhost:3000/api/status | grep -o '\"success\":\\s*true' | awk -F: '{print $$2}'",
    ]
  interval: 30s
  timeout: 10s
  retries: 3

Log Management

For large-scale clusters, a centralized log management system is recommended:

environment:
  - LOG_SQL_DSN=root:password@tcp(log-db-host:3306)/new_api_logs # 独立的日志数据库

Scaling Guide

As your business grows, you may need to expand your cluster size. The scaling steps are as follows:

1. Prepare new servers: Install Docker and Docker Compose
2. Configure slave nodes: Configure new slave nodes according to the instructions in "Step Three: Configure Slave Nodes"
3. Update load balancer configuration: Add the new nodes to the load balancer configuration
4. Test new nodes: Ensure the new nodes are working correctly and participating in load balancing

Best Practices

1. Regularly back up the database: Even in a cluster environment, the database should be backed up regularly
2. Monitor resource usage: Closely monitor CPU, memory, and disk usage
3. Adopt a rolling update strategy: When updating, update slave nodes first, and then update the master node after confirming stability
4. Configure an alerting system: Monitor node status and promptly notify administrators when issues occur
5. Geographically distributed deployment: If possible, deploy nodes in different geographical locations to improve availability

Troubleshooting

Nodes unable to synchronize data

• Check if Redis connection is normal
• Confirm that SESSION_SECRET and CRYPTO_SECRET are identical across all nodes
• Verify that the database connection configuration is correct

Load Imbalance

• Check load balancer configuration and weight settings
• Monitor resource usage of each node to ensure no node is overloaded
• May need to adjust node weights or add more nodes

Session Loss Issues

• Ensure all nodes use the same SESSION_SECRET
• Verify that Redis is configured correctly and accessible
• Check if the client is handling cookies correctly

Related Documentation

• Environment Variable Configuration Guide - Contains all relevant environment variables for multi-node deployment
• System Update Guide - System update strategy in a multi-node environment
• Docker Compose Configuration Instructions - Used for writing cluster node configuration files