Puma & NGINX 上游超时（110：连接超时）

访问在 Nginx 代理后面使用 systemd 服务运行的 Puma 应用程序会导致 nginx error.log 中出现以下错误：

 *6 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 1.2.3.4, server: mydomain.com, request: "GET / HTTP/1.1", upstream: "http://unix:/home/deploy/opt/app/shared/sockets/puma.app.sock/", host: "mydomain.com"

Puma 服务日志没有错误。

不过，在本地（在 nginx 之前）手动运行 Puma 应用程序不会产生任何错误。同样，在 http 代理而不是 puma unix 套接字上运行相同的应用程序也可以正常工作，允许 Nginx 正确地服务器请求。所以看起来问题不在于我的后端红宝石。

堆

• 彪马 4.3.3
• 罗达 3.30.0
• RBenv Ruby 2.7.0
• Nginx 1.14.0

/etc/nginx/sites_available/mydomain.com

upstream app {
  server unix:/home/deploy/opt/app/shared/sockets/puma.app.sock;
}

server {
  listen 80;
  server_name mydomain.com;
  root /home/deploy/opt/app/public;

  location / {
    try_files $uri @puma;
  }

  location @puma {
    include proxy_params;

    proxy_pass http://app;
  }
}

/etc/systemd/system/puma-app.service

[Unit]
Description=Puma HTTP Server
After=network.target

[Service]
# Foreground process (do not use --daemon in ExecStart or config.rb)
Type=simple

# Preferably configure a non-privileged user
User=deploy
Group=sudo

# Specify the path to your puma application root
WorkingDirectory=/home/deploy/opt/app

# Helpful for debugging socket activation, etc.
Environment=DEBUG=1
EnvironmentFile=/home/deploy/opt/app/.env

# The command to start Puma
ExecStart=/home/deploy/.rbenv/shims/bundle exec puma -C /home/deploy/opt/app/config/puma.rb

TimeoutSec = 15
Restart=always

[Install]
WantedBy=multi-user.target

/home/deploy/opt/app/config/puma.rb

# Change to match your CPU core count
workers ENV.fetch("PUMA_WORKERS") { 1 }

# Min and Max threads per worker
threads ENV.fetch("PUMA_MIN_THREADS") { 1 }, ENV.fetch("PUMA_MAX_THREADS") { 10 }

app_dir = File.expand_path("../..", __FILE__)
shared_dir = "#{app_dir}/shared"

# Set up socket location
bind "unix://#{shared_dir}/sockets/puma.app.sock"

# Redirect STDOUT to log files
stdout_redirect "#{app_dir}/log/puma.stdout.log", "#{app_dir}/log/puma.stderr.log", true

# Set master PID and state locations
pidfile "#{shared_dir}/pids/puma.app.pid"
state_path "#{shared_dir}/pids/puma.app.state"
rackup app_dir

activate_control_app