云服务器Ruby Unicorn+Nginx 502？worker_processes与超时

# config/unicorn.rb  
worker_processes Integer(ENV.fetch("RAILS_MAX_THREADS") { 4 }) * Integer(ENV.fetch("WEB_CONCURRENCY") { 4 })  

# TOP云推荐配置（根据CPU核心数动态调整）  
case ENV["TOP_CLOUD_CPU_CORES"]  
when "32"  # 双路E5-2660  
  worker_processes 16  
when "40"  # 双路E5-2680v2  
  worker_processes 20  
when "88"  # 双路E5-2696/98 V4  
  worker_processes 44  
when "112" # 双路Platinum 8173  
  worker_processes 56  
else  
  worker_processes 4  
end  

worker_processes = min(CPU核心数 / 2, 内存GB数 / 0.5)  
# 示例：112核服务器建议56个worker（每个worker约占用1GB内存）  

# config/unicorn.rb  
timeout 60  # 请求处理超时时间（秒，需与Nginx协同）  
keepalive_time 30  # 保持连接时间（秒）  

# TOP云专属多核优化  
preload_app true  # 预加载应用（减少内存占用）  
before_fork do |server, worker|  
  defined?(ActiveRecord::Base) && ActiveRecord::Base.connection.disconnect!  
end  

after_fork do |server, worker|  
  defined?(ActiveRecord::Base) && ActiveRecord::Base.establish_connection  
end  

#!/bin/bash  
# 保存为/usr/local/bin/monitor_unicorn.sh  
WORKER_COUNT=$(ps aux | grep '[u]nicorn worker' | wc -l)  
MEMORY_USAGE=$(ps -o rss= -p $(pgrep -f 'unicorn master') | awk '{sum+=$1} END {print sum/1024 "MB"}')  

echo "$(date): 当前Unicorn worker数 $WORKER_COUNT, 内存使用 $MEMORY_USAGE" >> /var/log/unicorn-monitor.log  

if [[ "$WORKER_COUNT" -lt "4" ]]; then  
  echo "WARNING: Unicorn worker数过低" | mail -s "Unicorn告警" admin@example.com  
fi  

if [[ "$(echo "$MEMORY_USAGE > 8000" | bc)" -eq 1 ]]; then  
  echo "CRITICAL: Unicorn内存使用超过8GB" | mail -s "Unicorn内存告警" admin@example.com  
fi  

crontab -e  
# 每5分钟检查一次  
*/5 * * * * /usr/local/bin/monitor_unicorn.sh  

upstream ruby_backend {  
  server unix:/tmp/unicorn.sock fail_timeout=0;  # Unicorn Unix Socket  
  keepalive 32;  # 保持长连接数（建议为worker_processes的1/10）  
}  

server {  
  listen 80;  
  server_name example.com;  

  location / {  
    proxy_pass http://ruby_backend;  
    proxy_set_header Host $host;  
    proxy_set_header X-Real-IP $remote_addr;  
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;  

    # 超时设置（需与Unicorn协同）  
    proxy_connect_timeout 5s;  
    proxy_send_timeout 60s;     # 适配文件上传等耗时操作  
    proxy_read_timeout 60s;  

    # 缓冲区优化（防止大响应体502）  
    proxy_buffer_size 16k;  
    proxy_buffers 8 32k;  
    proxy_busy_buffers_size 64k;  
  }  
}  

# 在http上下文中添加全局优化  
http {  
  # 启用TCP_NODELAY（减少小包延迟）  
  tcp_nodelay on;  

  # 启用TCP_FASTOPEN（需Linux内核≥3.7）  
  tcp_fastopen on;  

  # 连接复用优化（适用于200M带宽场景）  
  keepalive_requests 1000;  
  keepalive_timeout 75s;  

  # 多核负载均衡（适用于112核服务器）  
  worker_processes auto;  
  worker_cpu_affinity auto;  

  # 大文件传输优化  
  client_max_body_size 500M;  # 允许上传大文件  
  client_body_buffer_size 128k;  
}  

# 修改/etc/sysctl.conf  
net.core.somaxconn = 65535          # 连接队列大小  
net.ipv4.tcp_max_syn_backlog = 8192 # SYN队列长度  
net.ipv4.tcp_tw_reuse = 1           # 快速回收TIME_WAIT连接  
net.ipv4.tcp_fin_timeout = 15       # 缩短FIN_WAIT2超时  
fs.file-max = 1000000               # 系统最大文件描述符  
vm.overcommit_memory = 1            # 允许内存超分配（防止OOM Killer误杀）  

# 应用配置  
sysctl -p  
ulimit -n 65535                     # 用户级文件描述符限制