nginx.conf

#user nginx;
user www-data;
pid /run/nginx.pid;

worker_processes 2;
worker_rlimit_nofile 12288;

events {
  worker_connections 4096;
}

http {
  log_format ltsv "status:$status"
    "\ttime:$time_iso8601"
    "\treqtime:$request_time"
    "\tmethod:$request_method"
    "\turi:$request_uri"
    "\tprotocol:$server_protocol"
    "\tua:$http_user_agent"
    "\tforwardedfor:$http_x_forwarded_for"
    "\thost:$remote_addr"
    "\treferer:$http_referer"
    "\tserver_name:$server_name"
    "\tvhost:$host"
    "\tsize:$body_bytes_sent"
    "\treqsize:$request_length"
    "\truntime:$upstream_http_x_runtime"
    "\tapptime:$upstream_response_time"
    "\tuid:$upstream_http_x_isu_userid"
    "\txtime:$upstream_http_x_isu_time"
    "\treqid:$upstream_http_x_isu_reqid";
  access_log off;
  error_log /var/log/nginx/error.log warn;

  include       /etc/nginx/mime.types;
  default_type  application/octet-stream;

  sendfile on;
  open_file_cache max=1024 inactive=60s;
  tcp_nopush on;

  #gzip on;
  #gzip_min_length 1100;
  #gzip_buffers 4 8k;
  #gzip_types application/atom+xml text/plain text/css text/javascript application/json application/javascript;
  #gzip_vary on;
  #gzip_disable        "MSIE [1-6]\.";
  gzip_static on;

  keepalive_timeout  65;
  # keepalive_requests 10000;

  proxy_buffers 100 32k;
  proxy_buffer_size 8k;

  client_body_buffer_size 2M;
  client_max_body_size 20M;

	ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
	ssl_prefer_server_ciphers on;
  ssl_ciphers 'ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE+AESGCM:DHE+AESGCM:HIGH:!aNULL:!MD5';

  send_timeout 180;

  upstream app {
    server isu1:8888 fail_timeout=0;
    server isu2:8888 fail_timeout=0;
    #server isu3:8888 fail_timeout=0;
    keepalive 16;
    keepalive_timeout 65s;
    keepalive_requests 10000;
  }
  upstream isu1 {
    server isu1:8888 fail_timeout=0;
    keepalive 16;
    keepalive_requests 10000;
  }
  upstream isu2 {
    server isu2:8888 fail_timeout=0;
    keepalive 16;
    keepalive_requests 10000;
  }
  upstream isu3 {
    server isu3:8888 fail_timeout=0;
    keepalive 16;
    keepalive_requests 10000;
  }

  upstream localapp {
    server unix:/run/isutrain/puma.sock fail_timeout=0;
    keepalive 128;
    keepalive_requests 10000;
  }

  server {
    listen 0.0.0.0:8888 default_server;
    access_log off;

    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_set_header Host $http_host;
    proxy_http_version 1.1;

    location / {
      proxy_pass http://localapp;
    }
  }

  server {
    listen 0.0.0.0:443 http2 ssl default_server;
    access_log off;
    server_name _;

    ssl_certificate /etc/nginx/keys/fullchain.pem;
    ssl_certificate_key /etc/nginx/keys/privkey.pem;

    access_log off;

    proxy_set_header Connection "";
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_set_header Host $http_host;
    proxy_http_version 1.1;

    location / {
      root /home/isucon/git/isutrain/webapp/public;
      try_files $uri $uri/index.html /index.html;
    }

    location /api {
      proxy_pass http://app;
    }
    location /initialize {
      proxy_pass http://app;
    }

    location /~isucon/ {
      rewrite ^/~isucon/(.*)$ /$1 break;
      root /home/isucon/public_html;
    }


    location @localapp {
      proxy_pass http://localapp;
    }
    location @app {
      proxy_pass http://app;
    }
  }
}