一個和worker_connections引數相關的Nginx系統問題及解決辦法
阿新 • • 發佈：2019-01-27
1. 問題現象
nginx執行過程中，發現無法訪問nginx（導致nagios監控告警） ,且error日誌中一直報如下錯誤
2011/05/10 16:31:07 [alert] 24082#0: 1024 worker_connections is not enough while accepting new connection on 0.0.0.0:81
2011/05/10 16:31:07 [alert] 24082#0: 1024 worker_connections is not enough while accepting new connection on 0.0.0.0:81
2011/05/10 16:31:07 [alert] 24085#0: 1024 worker_connections is not enough while accepting new connection on 0.0.0.0:81
2011/05/10 16:31:07 [alert] 24082#0: 1024 worker_connections is not enough while accepting new connection on 0.0.0.0:81
2011/05/10 16:31:07 [alert] 24085#0: 1024 worker_connections is not enough while accepting new connection on 0.0.0.0:81
2011/05/10 16:31:08 [alert] 24082#0: 1024 worker_connections is not enough while accepting new connection on 0.0.0.0:81
2011/05/10 16:31:08 [alert] 24082#0: 1024 worker_connections is not enough while accepting new connection on 0.0.0.0:81
2011/05/10 16:31:08 [alert] 24085#0: 1024 worker_connections is not enough while accepting new connection on 0.0.0.0:81
2011/05/10 16:31:08 [alert] 24082#0: 1024 worker_connections is not enough while accepting new connection on 0.0.0.0:81
2.初步原因分析
目前nginx 中worker_connections 值設定是1024，worker_processes 值設定是4，按反向代理模式下最大連線數的理論計算公式：
最大連線數 = worker_processes * worker_connections/4
算出目前每臺nginx理論上只支援1024個。但觀察NGINX 歷史性能資料，發現活動連線數經常是大於1024，並且最高達到5000左右，因而有時會導致連線數不夠，直到NGINX無法再處理新的連線請求。
3.解決辦法
檢視相關資料，生產環境中worker_connections 建議值最好超過9000，計劃將一臺nginx 設定為10240，再觀察一段時間。
nginx執行過程中，發現無法訪問nginx（導致nagios監控告警） ,且error日誌中一直報如下錯誤
2011/05/10 16:31:07 [alert] 24082#0: 1024 worker_connections is not enough while accepting new connection on 0.0.0.0:81
2011/05/10 16:31:07 [alert] 24082#0: 1024 worker_connections is not enough while accepting new connection on 0.0.0.0:81
2011/05/10 16:31:07 [alert] 24085#0: 1024 worker_connections is not enough while accepting new connection on 0.0.0.0:81
2011/05/10 16:31:07 [alert] 24082#0: 1024 worker_connections is not enough while accepting new connection on 0.0.0.0:81
2011/05/10 16:31:07 [alert] 24085#0: 1024 worker_connections is not enough while accepting new connection on 0.0.0.0:81
2011/05/10 16:31:08 [alert] 24082#0: 1024 worker_connections is not enough while accepting new connection on 0.0.0.0:81
2011/05/10 16:31:08 [alert] 24082#0: 1024 worker_connections is not enough while accepting new connection on 0.0.0.0:81
2011/05/10 16:31:08 [alert] 24085#0: 1024 worker_connections is not enough while accepting new connection on 0.0.0.0:81
2011/05/10 16:31:08 [alert] 24082#0: 1024 worker_connections is not enough while accepting new connection on 0.0.0.0:81
2.初步原因分析
目前nginx 中worker_connections 值設定是1024，worker_processes 值設定是4，按反向代理模式下最大連線數的理論計算公式：
最大連線數 = worker_processes * worker_connections/4
算出目前每臺nginx理論上只支援1024個。但觀察NGINX 歷史性能資料，發現活動連線數經常是大於1024，並且最高達到5000左右，因而有時會導致連線數不夠，直到NGINX無法再處理新的連線請求。
3.解決辦法
檢視相關資料，生產環境中worker_connections 建議值最好超過9000，計劃將一臺nginx 設定為10240，再觀察一段時間。