Nginx —— 负载均衡
Nginx 实现负载均衡，Nginx 是个反向代理网关，可以将请求分发到不同的负载服务器，支持大量的链接。
配置文件：
user www-data; worker_processes 2; # 进程数 worker_cpu_affinity 00000001 00000010; pid /var/run/nginx.pid; error_log /var/log/nginx/error.log warn; events { use epoll; worker_connections 1024; # 每个进程允许的最大链接数 } http { include /etc/nginx/mime.types; default_type application/octet-stream; client_max_body_size 500m; resolver 114.114.114.114; log_format main '$time_local $remote_addr $remote_user $status ' '$request_time $request [$body_bytes_sent/$bytes_sent] ' '$http_user_agent $http_referer $http_x_forwarded_for'; access_log /var/log/nginx/access.log main; sendfile on; tcp_nopush on; keepalive_timeout 65; gzip on; # 负载 1:1 分发请求 upstream serverCluster{ server 172.31.5.3:8007 weight=1; server 172.31.37.173:8006 weight=1; } server { listen 80; server_name localhost; charset utf-8; location / { proxy_pass http://serverCluster; proxy_connect_timeout 1000; proxy_send_timeout 1000; proxy_read_timeout 1000; } } } 问题：nginx访问出现504 Gateway Time-out
server { listen 8888; location / { proxy_pass http://pdfs; proxy_connect_timeout 18000; proxy_send_timeout 18000; proxy_read_timeout 18000; } } proxy_connect_timeout 1800s;#nginx跟后端服务器连接超时时间(代理连接超时) proxy_send_timeout 1800s;#后端服务器数据回传时间(代理发送超时) proxy_read_timeout 1800s;#连接成功后，后端服务器响应时间(代理接收超时) 这三个配置很重要，，，如果请求的服务器很长时间不返回，设置长一点，可以保证不是 nginx报超时。