何もわからん

nginx.conf

user isucon;
worker_processes 2;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;

events {
  worker_connections 4096;
  accept_mutex_delay 100ms;
}

http {
  upstream isu8 {
    server 172.24.233.75:8081;
#    server 47.74.0.78:8081;
#DB server
#server 47.74.10.92:8081;
    keepalive 60;
  }

  upstream gunicorn {
    server unix:/tmp/gunicorn.sock;
  }

  server_tokens    off;
  include             /etc/nginx/mime.types;
  default_type        application/octet-stream;
  log_format ltsv "\tstatus:$status"
    "time:$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"
    "\tcache:$upstream_http_x_cache";

  access_log  /var/log/nginx/access.log  ltsv;

  sendfile            on;
  tcp_nopush          on;
  tcp_nodelay         on;
  keepalive_timeout   65;
  open_file_cache max=100 inactive=20s;

  proxy_buffering on;
  proxy_buffer_size 8k;
  proxy_buffers 100 32k;

  gzip on;
  gzip_http_version 1.0;
  gzip_proxied any;
  gzip_types    text/css
    text/javascript
    application/javascript;
  gzip_static on;



  server {
    listen 80;

    location ~ ^/(js|css|ico)/ {
      root /home/isucon/torb/webapp/static;
      expires max;
    }

    location / {
      proxy_http_version 1.1;
      proxy_set_header Connection "";
      proxy_set_header Host $host;
      proxy_pass http://isu8/;
    }
  }

  server {
    listen 8081;

    access_log off;

    location ~ ^/(js|css|ico)/ {
      root /home/isucon/torb/webapp/static;
      expires max;
    }

    location / {
      proxy_set_header Host $host;
      proxy_pass http://gunicorn/;
    }
  }

}