python - Nginx 网关超时，服务器负载不大

Question

我正在使用 NGINX 和 UWSGI 为基于 python/Django 的 API 后端提供支持，负载均衡器连接到 AWS 自动缩放组，我的服务器在日常工作中运行良好，但有时一两个月开始从服务器获取 504 或 502 一次持续一天或更长时间。我的服务器上的负载低于常规，内存使用情况良好，但仍然得到 502 或 504

使用 ubuntu 14.0.4

这是我的 nginx 配置的样子

user www-data;
worker_processes 2;
pid /run/nginx.pid;
events {
    worker_connections 2048;
    multi_accept on;
    use epoll;
}
worker_rlimit_nofile 40000;
http {
    ##
    # Basic Settings
    ##
    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 50s;
keepalive_requests 1024;
    types_hash_max_size 2048;
    # server_tokens off;
    # server_names_hash_bucket_size 64;
    # server_name_in_redirect off;
    client_body_timeout 12;
    client_header_timeout 12;
    send_timeout 10;
    limit_conn_zone $binary_remote_addr zone=addr:10m;
    limit_conn addr 20;
    open_file_cache max=5000 inactive=20s;
    open_file_cache_valid 30s;
    open_file_cache_min_uses 2;
    open_file_cache_errors on;
    include /etc/nginx/mime.types;
    default_type application/octet-stream;
 ##
    # Logging Settings
    ##
    log_format json '{"method": "$request_method", "uri": 
 "$request_uri", "status": $status, "request_time": $request_time, 
 "upstream_response_time": $upstream_response_time, "body_bytes_sent": 
 $body_bytes_sent, "http_user_agent": "$http_user_agent", "remote": 
"$remote_addr", "upstream": "$upstream_addr", "proxy": "$proxy_host"}';
    access_log /var/log/nginx/access.log;
    error_log /var/log/nginx/error.log;
    ##
    # Gzip Settings
    ##
    gzip on;
    gzip_disable "msie6";
    gzip_vary on;
gzip_proxied any;
    gzip_comp_level 9;
    #gzip_buffers 16 8k;
    #gzip_http_version 1.1;
    #gzip_types text/plain text/css application/json;
    gzip_types text/plain text/css application/json application/x-
javascript text/xml application/xml application/xml+rss text/javascript;
    ##
    # nginx-naxsi config
    ##
    # Uncomment it if you installed nginx-naxsi
    ##
    #include /etc/nginx/naxsi_core.rules;
    ##
    # nginx-passenger config
    ##
    # Uncomment it if you installed nginx-passenger
    ##
 include /etc/nginx/conf.d/*.conf;
    include /etc/nginx/sites-enabled/*;
}

Answer 1

首先，确定哪个服务器返回超时错误。负载均衡器或 Nginx Worker