worker_processes auto;
worker_rlimit_nofile 65535;

error_log /var/log/nginx/error.log warn;
pid /var/run/nginx.pid;

events {
    worker_connections 4096;
    use epoll;
    multi_accept on;
    accept_mutex_delay 100ms;
}

http {
    limit_conn_zone $binary_remote_addr zone=conn_limit_per_ip:10m;

    limit_req_zone $binary_remote_addr zone=api_limit:10m rate=6r/s;

    limit_req_zone $binary_remote_addr zone=auth_limit:10m rate=3r/s;

    limit_req_zone $binary_remote_addr zone=bot_limit:10m rate=1r/s;

    limit_req_zone $binary_remote_addr zone=static_limit:10m rate=100r/s;

    limit_req_zone $binary_remote_addr zone=req_limit_per_ip:10m rate=10r/s;

    map $http_user_agent $limit_bots {
        default "";
        ~*(googlebot|bingbot|yandex|baiduspider) $binary_remote_addr;
    }
    limit_req_zone $limit_bots zone=bots:10m rate=20r/m;

    limit_req_zone $request_method zone=post_limit:10m rate=5r/s;

    proxy_cache_path /var/cache/nginx levels=1:2 keys_zone=my_cache:10m max_size=1g inactive=40m use_temp_path=off;

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

    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 75;
    keepalive_requests 100;
    types_hash_max_size 2048;
    server_tokens off;
    client_max_body_size 10m;
    client_body_buffer_size 128k;

    client_body_timeout 12;
    client_header_timeout 12;
    send_timeout 30;
    reset_timedout_connection on;

    client_header_buffer_size 1k;
    large_client_header_buffers 4 8k;

    gzip on;
    gzip_vary on;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_types text/plain text/css text/xml application/json application/javascript application/xml+rss
               application/atom+xml image/svg+xml;

    log_format main '$remote_addr - $remote_user [$time_local] "$request" '
                    '$status $body_bytes_sent "$http_referer" '
                    '"$http_user_agent" "$http_x_forwarded_for" '
                    'rt=$request_time uct="$upstream_connect_time" uht="$upstream_header_time" urt="$upstream_response_time"';

    log_format ddos_log '$remote_addr - [$time_local] "$request" $status '
                        'rate=$limit_req_status conn=$limit_conn_status '
                        'user_agent="$http_user_agent"';

    access_log /var/log/nginx/access.log main;
    error_log /var/log/nginx/error.log warn;

    limit_req_status 429;
    limit_conn_status 429;

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