# This config was inspired by: https://github.com/antonputra/tutorials/blob/226/lessons/226/nginx/nginx.conf

# Defines user and group credentials used by worker processes.
user www-data;

# Defines the number of worker processes. Generally, it should match the number of CPU cores.
worker_processes auto;

# Binds worker processes to the sets of CPUs.
worker_cpu_affinity auto;

# Change the default thread pool settings
thread_pool default threads=2 max_queue=16384;

# Limit on the maximum number of open files (RLIMIT_NOFILE) for worker processes.
worker_rlimit_nofile 32768;

# Logging configuration.
error_log /var/log/nginx/error.log notice;

# Defines a file that will store the process ID of the main process.
pid /var/run/nginx.pid;

events {
    # Maximum number of simultaneous connections that can be opened by a worker process.
    worker_connections 16384;

    # Serve many clients each thread (Linux only)
    use epoll;

    # Accept as many connections as possible. If it is disabled, a worker process will accept one new connection at a time.
    multi_accept on;
}

http {
    # Copies data between one FD and other from within the kernel
    # faster than read() + write()
    sendfile on;

    # Use the default thread pool for asynchronous file I/O
    aio threads;

    # Only use AIO is used for when larger than or equal to this size
    directio 6m;

    # Send headers in one piece, it is better than sending them one by one
    tcp_nopush on;

    # Don't buffer data sent, good for small data bursts in real time
    tcp_nodelay on;

    # Disable logging if a file can't be found
    log_not_found off;

    # Server will close connection after this time
    keepalive_timeout 60;

    # Max size of types hash tables (processing static sets of data. eg. server names, map directives or mime types)
    types_hash_max_size 2048;

    # Max allowed size of the client request body
    client_max_body_size 250M;

    # If the request body size is more than the buffer size, then the entire (or partial)
    # request body is written into a temporary file
    client_body_buffer_size 512k;

    # Request timed out
    client_body_timeout 300s;

    # Allow the server to close connection on non responding client, this will free up memory
    reset_timedout_connection on;

    # Include MIME (Multipurpose Internet Mail Extensions) types.
    include /etc/nginx/mime.types;

    # Defines the default MIME type of a response
    default_type application/octet-stream;

    # Configures logging.
    log_format main '$remote_addr - $remote_user [$time_local] "$request" '
    '$status $body_bytes_sent "$http_referer" '
    '"$http_user_agent" "$http_x_forwarded_for"';

    # Sets the path, format, and configuration for a buffered log write.
    access_log /var/log/nginx/access.log main;

    # Disable compression.
    gzip off;

    server {
        listen 80 default_server;
        listen [::]:80 default_server;

        server_name _;

        root /var/www;
        index index.html index.htm;

        location / {
            try_files $uri $uri/ =404;
        }
    }

    server {
        listen 81 default_server http2;
        listen [::]:81 default_server http2;

        server_name _;

        root /var/www;
        index index.html index.htm;

        location / {
            try_files $uri $uri/ =404;
        }
    }

    include /etc/nginx/conf.d/*.conf;
}