nginx resource_error ai_generated true

nginx：[警报] 1024 个工作连接不足以连接到上游

nginx: [alert] 1024 worker_connections are not enough while connecting to upstream

ID: nginx/worker-connections-are-not-enough-while-connecting-to-upstream

其他格式: JSON · Markdown 中文 · English
80%修复率
85%置信度
1证据数
2023-09-01首次发现

版本兼容性

版本状态引入弃用备注
nginx 1.24.0 active — — —
nginx 1.22.1 active — — —
nginx 1.20.2 active — — —
nginx 1.18.0 active — — —

根因分析

同时连接数超过了 worker_connections 限制，导致连接上游服务器失败。

English

The number of simultaneous connections exceeds the worker_connections limit, causing connection failures to upstream servers.

generic

官方文档

https://nginx.org/en/docs/ngx_core_module.html#worker_connections

解决方案

  1. 增加 worker_connections 并调整系统限制：
events {
    worker_connections 4096;
    multi_accept on;
}
同时增加系统最大打开文件数：ulimit -n 65536 并在 /etc/security/limits.conf 中设置：
* soft nofile 65536
* hard nofile 65536
然后重新加载 nginx。
  2. 增加 worker_processes 数量以分配连接：
worker_processes auto;
这将使用所有 CPU 核心；每个 worker 有自己的连接池。
  3. 实施速率限制或按 IP 限制连接以防止滥用：
limit_conn_zone $binary_remote_addr zone=addr:10m;
limit_conn addr 100;
这将限制每个客户端的连接数，以保持在 worker_connections 范围内。

无效尝试

常见但无效的做法:

  1. 50% 失败

    System limits (ulimit -n, fs.file-max) may still cap the total connections; also the OS may have per-process limits.

  2. 40% 失败

    While it reduces connection duration, it increases connection churn and may still hit the limit under high concurrency.

  3. 30% 失败

    Multi_accept affects connection acceptance behavior but does not increase the maximum number of connections.