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                * upstream ~~~ upstream staticserver { server 192.168.20.139:8085; server 192.168.20.140:8085; } ~~~ * server ~~~ Syntax: server address [parameters]; Default: — Context: upstream ~~~ 功能:在upstream配置段中,用來定義后端主機的 Parameters參數有如下 1)weight=number 配置每個后端服務器的權重 2)max_fails=number 配置請求嘗試失敗的次數 3)fail_timeout=time 這是一個設置參數,一般跟上面的參數協同使用。該參數的含義: 1:當連接后端server失敗時,多長時間內可反復嘗試連接后端server; 2:一旦超過這個設置時間段,則判斷該server的狀態為不可用(unavailable ); 這個參數的默認值為10秒 4)down 手動標記某一臺服務器為永久不可用(一般和ip_hash一起使用) 5)backup 當所有后端服務器上都不可用了,這個才會被生效 * keepalive ~~~ Syntax: keepalive connections; Default: — Context: upstream This directive appeared in version 1.1.4. ~~~ 二)調度方式 * ip_hash 功能:根據客戶端的ip地址來調度,使得同一個客戶端IP被始終定向到同一臺upstream server ~~~ upstream backend { ip_hash; server backend1.example.com; server backend2.example.com; server backend3.example.com down; server backend4.example.com; } ~~~ * hash ~~~ Syntax: hash key [consistent]; Default: — Context: upstream This directive appeared in version 1.7.2. ~~~ 功能:用來設置負載均衡中,客戶端尋找各后端server基于hash函數。可以根據這里的key值做哈希,然后除以后端服務器的總權限,然后分配給某臺server。 1)當摘除一個server或增加一個server,會導致hash重新計算,導致原來大多數key可能會尋找到不同server上 2)若使用consistent(一致性哈希算法),只有部分key會受影響 * sticky 安裝第三方模塊nginx-sticky-module-ng git clone https://github.com/bymaximus/nginx-sticky-module-ng.git 1)重新編譯nginx,添加如下 --add-module=/usr/local/src/nginx-sticky-module-ng 2)然后執行make,把objs/nginx 拷貝到/usr/local/nginx-1.12.1/sbin/ 3)重新啟動nginx
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