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                ## upstream 1. 默認已被編譯進nginx; 2. 禁用須通過--without-http_upstream_module; ## upstream語法結構 語法: ``` upstream name {...} ``` 上下文: ``` http ``` ## server 語法: ``` server address [parameters] ``` 上下文: ``` upstream ``` parameters可選值: | 可選參數 | 含義 | | --- | --- | | weight=number | 權重值,默認為1 | | max_conns=number | 上游服務器的最大并發連接數 | | fail_timeout=time | 服務器不可用的判定時間 | | max_files=number | 服務器不可用的檢查次數,在fail_timeout時間范圍內檢查的次數,不是永遠不將請求轉發給它了.當確認它不可用之后就會標記 | | backup | 備份服務器,僅當其他服務器都不可用時 | | backup | 備份服務器,僅當其他服務器都不可用時 | | down | 標記服務器長期不可用,離線服務 | ## keepalive 限制每個worker子進程與上游服務器**空閑**長連接的最大數量; 語法: ``` keepalive connections; ``` 上下文: ``` upstream ``` 示例: ``` keepalive 16; ``` ## keepalive_requests 單個長連接可以處理的最多HTTP請求個數;當達到這個請求個數后,關閉這個鏈接,等客戶端再請求的時候再創建一個新的連接; 語法: ``` keepalive_requests number; ``` 默認值: ``` keepalive_requests 100; ``` 上下文: ``` upstream ``` ## keepalive_timeout 空閑長連接的最長保持時間;每個長連接可以允許的最長時間; 語法: ``` keepalive_timeout time; ``` 默認值: ``` keepalive_timeout 60s; ``` 上下文: ``` upstream ``` ## queue(商業版才可使用) 所有上游服務器不可用時,請求會被放到隊列中等待; 語法: ``` queue number [timeout=time]; ``` 上下文: ``` upstream ``` 示例: ``` queue 100 timeout=30s; //定義100個連接放入內存中,可以放置30s秒 ``` ## 示例 ``` upstream back_end{ //back_end是名稱 server 127.0.0.1:8080 weight=3 max_conns=1000 fail_timeout=10s max_fails=2; keepalive 32; keepalive_requests 50; keepalive_timeout 30s; } ```
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