{"id":15782,"date":"2024-11-18T15:54:07","date_gmt":"2024-11-18T07:54:07","guid":{"rendered":"https:\/\/fwq.ai\/blog\/15782\/"},"modified":"2024-11-18T15:54:07","modified_gmt":"2024-11-18T07:54:07","slug":"nginx-upstream%e9%85%8d%e7%bd%ae%e8%af%a6%e8%a7%a3%ef%bc%8c%e5%ae%9e%e7%8e%b0%e4%bf%ae%e5%a4%8d%e7%bd%91%e7%ab%99%e6%95%85%e9%9a%9c","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/15782\/","title":{"rendered":"Nginx upstream\u914d\u7f6e\u8be6\u89e3\uff0c\u5b9e\u73b0\u4fee\u590d\u7f51\u7ad9\u6545\u969c"},"content":{"rendered":"<p> upstream\u914d\u7f6e\u8be6\u89e3\uff0c\u5b9e\u73b0\u4fee\u590d\u7f51\u7ad9\u6545\u969c<\/p>\n<p>\u5f15\u8a00:<br \/>Nginx \u662f\u4e00\u4e2a\u9ad8\u6027\u80fd\u7684HTTP\u548c\u53cd\u5411\u4ee3\u7406\u670d\u52a1\u5668\uff0c\u5b83\u7684\u5f3a\u5927\u529f\u80fd\u548c\u7075\u6d3b\u7684\u914d\u7f6e\u4f7f\u5176\u6210\u4e3a\u8bb8\u591a\u7f51\u7ad9\u548c\u670d\u52a1\u7684\u7406\u60f3\u9009\u62e9\u3002\u5728\u7f51\u7ad9\u8fd0\u8425\u8fc7\u7a0b\u4e2d\uff0c\u96be\u514d\u4f1a\u51fa\u73b0\u6545\u969c\u548c\u8d1f\u8f7d\u9ad8\u5cf0\u7684\u95ee\u9898\u3002\u4e3a\u4e86\u4fdd\u969c\u7f51\u7ad9\u7684\u53ef\u7528\u6027\u548c\u7a33\u5b9a\u6027\uff0c\u6211\u4eec\u9700\u8981\u638c\u63e1Nginx upstream\u914d\u7f6e\u7684\u6280\u5de7\u3002\u672c\u6587\u5c06\u8be6\u7ec6\u4ecb\u7ecdNginx upstream\u914d\u7f6e\u7684\u539f\u7406\u548c\u4f7f\u7528\u65b9\u5f0f\uff0c\u5e76\u901a\u8fc7\u4ee3\u7801\u793a\u4f8b\u6f14\u793a\u5982\u4f55\u5229\u7528upstream\u914d\u7f6e\u5b9e\u73b0\u4fee\u590d\u7f51\u7ad9\u6545\u969c\u7684\u65b9\u6cd5\u3002<\/p>\n<p>\u4e00\u3001Nginx upstream\u914d\u7f6e\u7684\u539f\u7406<br \/>Nginx\u7684upstream\u6a21\u5757\u5141\u8bb8\u6211\u4eec\u5b9a\u4e49\u4e00\u7ec4\u540e\u7aef\u670d\u52a1\u5668\uff0c\u5e76\u6839\u636e\u4e00\u5b9a\u7684\u7b56\u7565\u8f6c\u53d1\u5ba2\u6237\u7aef\u8bf7\u6c42\u5230\u8fd9\u4e9b\u540e\u7aef\u670d\u52a1\u5668\u4e0a\u3002\u901a\u8fc7upstream\u914d\u7f6e\uff0c\u53ef\u4ee5\u5b9e\u73b0\u8d1f\u8f7d\u5747\u8861\u548c\u6545\u969c\u8f6c\u79fb\u7b49\u529f\u80fd\u3002Nginx\u6839\u636e\u914d\u7f6e\u7684\u7b56\u7565\uff0c\u81ea\u52a8\u9009\u62e9\u540e\u7aef\u670d\u52a1\u5668\uff0c\u5e76\u5c06\u5ba2\u6237\u7aef\u8bf7\u6c42\u8f6c\u53d1\u5230\u6240\u9009\u7684\u670d\u52a1\u5668\u4e0a\u3002\u5728\u540e\u7aef\u670d\u52a1\u5668\u6545\u969c\u65f6\uff0cNginx\u652f\u6301\u81ea\u52a8\u5254\u9664\u6545\u969c\u670d\u52a1\u5668\uff0c\u5e76\u5c06\u8bf7\u6c42\u91cd\u65b0\u5206\u914d\u5230\u5176\u4ed6\u6b63\u5e38\u7684\u670d\u52a1\u5668\u4e0a\u3002<\/p>\n<p>\u4e8c\u3001Nginx upstream\u914d\u7f6e\u7684\u4f7f\u7528\u65b9\u5f0f<\/p>\n<ol>\n<li>\u5b9a\u4e49upstream\u5757<br \/>\u5728Nginx\u7684\u914d\u7f6e\u6587\u4ef6\u4e2d\uff0c\u901a\u8fc7upstream\u5173\u952e\u5b57\u5b9a\u4e49\u4e00\u4e2aupstream\u5757\u3002\u6bcf\u4e2aupstream\u5757\u53ef\u4ee5\u5305\u542b\u591a\u4e2a\u540e\u7aef\u670d\u52a1\u5668\uff0c\u5e76\u53ef\u4ee5\u8bbe\u7f6e\u8d1f\u8f7d\u5747\u8861\u7684\u7b56\u7565\u548c\u76f8\u5173\u7684\u53c2\u6570\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u4f8b\u5b50\uff1a<\/li>\n<\/ol>\n<pre>upstream backend {\n    server backend1.example.com;\n    server backend2.example.com;\n    server backend3.example.com;\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4e0a\u8ff0\u914d\u7f6e\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a\u540d\u4e3a&#8221;backend&#8221;\u7684upstream\u5757\uff0c\u5176\u4e2d\u5305\u542b\u4e86\u4e09\u4e2a\u540e\u7aef\u670d\u52a1\u5668\u3002<\/p>\n<ol>\n<li>\u4f7f\u7528upstream\u5757<br \/>\u5728Nginx\u7684\u914d\u7f6e\u6587\u4ef6\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7proxy_pass\u6307\u4ee4\u5c06\u5ba2\u6237\u7aef\u8bf7\u6c42\u8f6c\u53d1\u5230upstream\u5757\u5b9a\u4e49\u7684\u540e\u7aef\u670d\u52a1\u5668\u4e0a\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\u914d\u7f6e\uff1a<\/li>\n<\/ol>\n<pre>location \/ {\n    proxy_pass http:\/\/backend;\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4e0a\u8ff0\u914d\u7f6e\u4e2d\uff0c\u6211\u4eec\u5c06\u5ba2\u6237\u7aef\u8bf7\u6c42\u8f6c\u53d1\u5230\u540d\u4e3a&#8221;backend&#8221;\u7684upstream\u5757\u5b9a\u4e49\u7684\u540e\u7aef\u670d\u52a1\u5668\u4e0a\u3002<\/p>\n<p>\u4e09\u3001\u5229\u7528upstream\u914d\u7f6e\u5b9e\u73b0\u4fee\u590d\u7f51\u7ad9\u6545\u969c\u7684\u65b9\u6cd5<br \/>\u5728\u5b9e\u9645\u7f51\u7ad9\u8fd0\u8425\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u4f1a\u9047\u5230\u540e\u7aef\u670d\u52a1\u5668\u6545\u969c\u7684\u60c5\u51b5\u3002\u4e3a\u4e86\u4fdd\u6301\u7f51\u7ad9\u7684\u53ef\u7528\u6027\uff0c\u6211\u4eec\u9700\u8981\u53ca\u65f6\u53d1\u73b0\u5e76\u89e3\u51b3\u6545\u969c\uff0c\u5e76\u786e\u4fdd\u6545\u969c\u670d\u52a1\u5668\u4e0d\u4f1a\u5f71\u54cd\u5230\u6574\u4f53\u7684\u670d\u52a1\u8d28\u91cf\u3002\u901a\u8fc7\u5408\u7406\u914d\u7f6eupstream\u5757\uff0c\u6211\u4eec\u53ef\u4ee5\u8f7b\u677e\u5b9e\u73b0\u6545\u969c\u8f6c\u79fb\u548c\u4fee\u590d\u3002<\/p>\n<ol>\n<li>\u68c0\u6d4b\u540e\u7aef\u670d\u52a1\u5668\u7684\u53ef\u7528\u6027<br \/>Nginx\u652f\u6301\u591a\u79cd\u65b9\u5f0f\u6765\u68c0\u6d4b\u540e\u7aef\u670d\u52a1\u5668\u7684\u53ef\u7528\u6027\uff0c\u5305\u62ecHTTP\u3001TCP\u548cUDP\u7b49\u3002\u5728upstream\u5757\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u8bbe\u7f6ehealth_check\u5173\u952e\u5b57\u6765\u542f\u7528\u5065\u5eb7\u68c0\u67e5\u529f\u80fd\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\u914d\u7f6e\uff1a<\/li>\n<\/ol>\n<pre>upstream backend {\n    server backend1.example.com;\n    server backend2.example.com;\n    server backend3.example.com;\n\n    health_check;\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4e0a\u8ff0\u914d\u7f6e\u4e2d\uff0c\u6211\u4eec\u901a\u8fc7\u8bbe\u7f6ehealth_check\u5173\u952e\u5b57\u542f\u7528\u4e86\u5065\u5eb7\u68c0\u67e5\u529f\u80fd\u3002Nginx\u4f1a\u5b9a\u671f\u53d1\u9001\u8bf7\u6c42\u5230\u540e\u7aef\u670d\u52a1\u5668\uff0c\u5e76\u6839\u636e\u8fd4\u56de\u7684\u72b6\u6001\u7801\u5224\u65ad\u670d\u52a1\u5668\u7684\u53ef\u7528\u6027\u3002<\/p>\n<ol>\n<li>\u5254\u9664\u6545\u969c\u670d\u52a1\u5668<br \/>\u5f53\u670d\u52a1\u5668\u6545\u969c\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u624b\u52a8\u6216\u81ea\u52a8\u7684\u65b9\u5f0f\u5c06\u6545\u969c\u670d\u52a1\u5668\u5254\u9664\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\u914d\u7f6e\uff1a<\/li>\n<\/ol>\n<pre>upstream backend {\n    server backend1.example.com;\n    server backend2.example.com down;\n    server backend3.example.com;\n\n    health_check;\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4e0a\u8ff0\u914d\u7f6e\u4e2d\uff0c\u6211\u4eec\u5728\u6545\u969c\u7684\u670d\u52a1\u5668\u914d\u7f6e\u540e\u6dfb\u52a0\u4e86down\u5173\u952e\u5b57\u3002\u5f53Nginx\u68c0\u6d4b\u5230\u670d\u52a1\u5668\u6545\u969c\u540e\uff0c\u4f1a\u81ea\u52a8\u5c06down\u6807\u8bb0\u7684\u670d\u52a1\u5668\u4eceupstream\u5757\u7684\u9009\u62e9\u8303\u56f4\u4e2d\u5254\u9664\u3002<\/p>\n<ol>\n<li>\u8bbe\u7f6e\u6700\u5927\u5931\u8d25\u6b21\u6570<br \/>\u4e3a\u4e86\u907f\u514d\u8bef\u5224\u548c\u9891\u7e41\u7684\u6545\u969c\u8f6c\u79fb\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u8bbe\u7f6emax_fails\u5173\u952e\u5b57\u6765\u9650\u5236\u6545\u969c\u670d\u52a1\u5668\u7684\u6700\u5927\u5931\u8d25\u6b21\u6570\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\u914d\u7f6e\uff1a<\/li>\n<\/ol>\n<pre>upstream backend {\n    server backend1.example.com max_fails=3 fail_timeout=30s;\n    server backend2.example.com down;\n    server backend3.example.com max_fails=3 fail_timeout=30s;\n\n    health_check;\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4e0a\u8ff0\u914d\u7f6e\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528max_fails\u5173\u952e\u5b57\u8bbe\u7f6e\u4e86\u6545\u969c\u670d\u52a1\u5668\u7684\u6700\u5927\u5931\u8d25\u6b21\u6570\u4e3a3\u6b21\u3002\u5f53\u67d0\u4e2a\u670d\u52a1\u5668\u7684\u5931\u8d25\u6b21\u6570\u8fbe\u5230\u9650\u5236\u540e\uff0cNginx\u4f1a\u5c06\u5176\u4ece\u9009\u62e9\u8303\u56f4\u4e2d\u5254\u9664\uff0c\u5e76\u5728\u8bbe\u7f6e\u7684\u8d85\u65f6\u65f6\u95f4\u5185\u4e0d\u518d\u5c1d\u8bd5\u8fde\u63a5\u3002<\/p>\n<p>\u7ed3\u8bba:<br \/>\u901a\u8fc7\u5408\u7406\u914d\u7f6eNginx\u7684upstream\u5757\uff0c\u6211\u4eec\u53ef\u4ee5\u5b9e\u73b0\u8d1f\u8f7d\u5747\u8861\u548c\u6545\u969c\u8f6c\u79fb\u7b49\u529f\u80fd\uff0c\u63d0\u9ad8\u7f51\u7ad9\u7684\u53ef\u7528\u6027\u548c\u7a33\u5b9a\u6027\u3002\u5728\u7f51\u7ad9\u8fd0\u8425\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4eec\u5e94\u8be5\u53ca\u65f6\u53d1\u73b0\u5e76\u4fee\u590d\u540e\u7aef\u670d\u52a1\u5668\u7684\u6545\u969c\uff0c\u5e76\u901a\u8fc7upstream\u7684\u5065\u5eb7\u68c0\u67e5\u548c\u6545\u969c\u5254\u9664\u529f\u80fd\uff0c\u786e\u4fdd\u670d\u52a1\u5668\u7684\u53ef\u7528\u6027\u3002\u5e0c\u671b\u672c\u6587\u5bf9\u5927\u5bb6\u7406\u89e3Nginx upstream\u914d\u7f6e\u7684\u539f\u7406\u548c\u4f7f\u7528\u65b9\u5f0f\uff0c\u5e76\u5728\u4fee\u590d\u7f51\u7ad9\u6545\u969c\u65f6\u63d0\u4f9b\u5e2e\u52a9\u548c\u6307\u5bfc\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662fNginx upstream\u914d\u7f6e\u8be6\u89e3\uff0c\u5b9e\u73b0\u4fee\u590d\u7f51\u7ad9\u6545\u969c\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>upstream\u914d\u7f6e\u8be6\u89e3\uff0c\u5b9e\u73b0\u4fee\u590d\u7f51\u7ad9\u6545\u969c \u5f15\u8a00:Nginx \u662f\u4e00\u4e2a\u9ad8\u6027\u80fd\u7684HTTP\u548c\u53cd\u5411\u4ee3\u7406\u670d\u52a1\u5668\uff0c\u5b83\u7684\u5f3a\u5927\u529f\u80fd\u548c\u7075\u6d3b\u7684\u914d\u7f6e\u4f7f\u5176\u6210\u4e3a\u8bb8\u591a\u7f51\u7ad9\u548c\u670d\u52a1\u7684\u7406\u60f3\u9009\u62e9\u3002\u5728\u7f51\u7ad9\u8fd0\u8425\u8fc7\u7a0b\u4e2d\uff0c\u96be\u514d\u4f1a\u51fa\u73b0\u6545\u969c\u548c\u8d1f\u8f7d\u9ad8\u5cf0\u7684\u95ee\u9898\u3002\u4e3a\u4e86\u4fdd\u969c\u7f51\u7ad9\u7684\u53ef\u7528\u6027\u548c\u7a33\u5b9a\u6027\uff0c\u6211\u4eec\u9700\u8981\u638c\u63e1Nginx upstream\u914d\u7f6e\u7684\u6280\u5de7\u3002\u672c\u6587\u5c06\u8be6\u7ec6\u4ecb\u7ecdNginx upstream\u914d\u7f6e\u7684\u539f\u7406\u548c\u4f7f\u7528\u65b9\u5f0f\uff0c\u5e76\u901a\u8fc7\u4ee3\u7801\u793a\u4f8b\u6f14\u793a\u5982\u4f55\u5229\u7528upstream\u914d\u7f6e\u5b9e\u73b0\u4fee\u590d\u7f51\u7ad9\u6545\u969c\u7684\u65b9\u6cd5\u3002 \u4e00\u3001Nginx upstream\u914d\u7f6e\u7684\u539f\u7406Nginx\u7684upstream\u6a21\u5757\u5141\u8bb8\u6211\u4eec\u5b9a\u4e49\u4e00\u7ec4\u540e\u7aef\u670d\u52a1\u5668\uff0c\u5e76\u6839\u636e\u4e00\u5b9a\u7684\u7b56\u7565\u8f6c\u53d1\u5ba2\u6237\u7aef\u8bf7\u6c42\u5230\u8fd9\u4e9b\u540e\u7aef\u670d\u52a1\u5668\u4e0a\u3002\u901a\u8fc7upstream\u914d\u7f6e\uff0c\u53ef\u4ee5\u5b9e\u73b0\u8d1f\u8f7d\u5747\u8861\u548c\u6545\u969c\u8f6c\u79fb\u7b49\u529f\u80fd\u3002Nginx\u6839\u636e\u914d\u7f6e\u7684\u7b56\u7565\uff0c\u81ea\u52a8\u9009\u62e9\u540e\u7aef\u670d\u52a1\u5668\uff0c\u5e76\u5c06\u5ba2\u6237\u7aef\u8bf7\u6c42\u8f6c\u53d1\u5230\u6240\u9009\u7684\u670d\u52a1\u5668\u4e0a\u3002\u5728\u540e\u7aef\u670d\u52a1\u5668\u6545\u969c\u65f6\uff0cNginx\u652f\u6301\u81ea\u52a8\u5254\u9664\u6545\u969c\u670d\u52a1\u5668\uff0c\u5e76\u5c06\u8bf7\u6c42\u91cd\u65b0\u5206\u914d\u5230\u5176\u4ed6\u6b63\u5e38\u7684\u670d\u52a1\u5668\u4e0a\u3002 \u4e8c\u3001Nginx upstream\u914d\u7f6e\u7684\u4f7f\u7528\u65b9\u5f0f \u5b9a\u4e49upstream\u5757\u5728Nginx\u7684\u914d\u7f6e\u6587\u4ef6\u4e2d\uff0c\u901a\u8fc7upstream\u5173\u952e\u5b57\u5b9a\u4e49\u4e00\u4e2aupstream\u5757\u3002\u6bcf\u4e2aupstream\u5757\u53ef\u4ee5\u5305\u542b\u591a\u4e2a\u540e\u7aef\u670d\u52a1\u5668\uff0c\u5e76\u53ef\u4ee5\u8bbe\u7f6e\u8d1f\u8f7d\u5747\u8861\u7684\u7b56\u7565\u548c\u76f8\u5173\u7684\u53c2\u6570\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u4f8b\u5b50\uff1a upstream backend { server backend1.example.com; server backend2.example.com; server backend3.example.com; } \u767b\u5f55\u540e\u590d\u5236 \u4e0a\u8ff0\u914d\u7f6e\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a\u540d\u4e3a&#8221;backend&#8221;\u7684upstream\u5757\uff0c\u5176\u4e2d\u5305\u542b\u4e86\u4e09\u4e2a\u540e\u7aef\u670d\u52a1\u5668\u3002 \u4f7f\u7528upstream\u5757\u5728Nginx\u7684\u914d\u7f6e\u6587\u4ef6\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7proxy_pass\u6307\u4ee4\u5c06\u5ba2\u6237\u7aef\u8bf7\u6c42\u8f6c\u53d1\u5230upstream\u5757\u5b9a\u4e49\u7684\u540e\u7aef\u670d\u52a1\u5668\u4e0a\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\u914d\u7f6e\uff1a location \/ { proxy_pass http:\/\/backend; } \u767b\u5f55\u540e\u590d\u5236 \u4e0a\u8ff0\u914d\u7f6e\u4e2d\uff0c\u6211\u4eec\u5c06\u5ba2\u6237\u7aef\u8bf7\u6c42\u8f6c\u53d1\u5230\u540d\u4e3a&#8221;backend&#8221;\u7684upstream\u5757\u5b9a\u4e49\u7684\u540e\u7aef\u670d\u52a1\u5668\u4e0a\u3002 \u4e09\u3001\u5229\u7528upstream\u914d\u7f6e\u5b9e\u73b0\u4fee\u590d\u7f51\u7ad9\u6545\u969c\u7684\u65b9\u6cd5\u5728\u5b9e\u9645\u7f51\u7ad9\u8fd0\u8425\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u4f1a\u9047\u5230\u540e\u7aef\u670d\u52a1\u5668\u6545\u969c\u7684\u60c5\u51b5\u3002\u4e3a\u4e86\u4fdd\u6301\u7f51\u7ad9\u7684\u53ef\u7528\u6027\uff0c\u6211\u4eec\u9700\u8981\u53ca\u65f6\u53d1\u73b0\u5e76\u89e3\u51b3\u6545\u969c\uff0c\u5e76\u786e\u4fdd\u6545\u969c\u670d\u52a1\u5668\u4e0d\u4f1a\u5f71\u54cd\u5230\u6574\u4f53\u7684\u670d\u52a1\u8d28\u91cf\u3002\u901a\u8fc7\u5408\u7406\u914d\u7f6eupstream\u5757\uff0c\u6211\u4eec\u53ef\u4ee5\u8f7b\u677e\u5b9e\u73b0\u6545\u969c\u8f6c\u79fb\u548c\u4fee\u590d\u3002 \u68c0\u6d4b\u540e\u7aef\u670d\u52a1\u5668\u7684\u53ef\u7528\u6027Nginx\u652f\u6301\u591a\u79cd\u65b9\u5f0f\u6765\u68c0\u6d4b\u540e\u7aef\u670d\u52a1\u5668\u7684\u53ef\u7528\u6027\uff0c\u5305\u62ecHTTP\u3001TCP\u548cUDP\u7b49\u3002\u5728upstream\u5757\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u8bbe\u7f6ehealth_check\u5173\u952e\u5b57\u6765\u542f\u7528\u5065\u5eb7\u68c0\u67e5\u529f\u80fd\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\u914d\u7f6e\uff1a upstream backend { server backend1.example.com; server backend2.example.com; server backend3.example.com; health_check; } \u767b\u5f55\u540e\u590d\u5236 \u4e0a\u8ff0\u914d\u7f6e\u4e2d\uff0c\u6211\u4eec\u901a\u8fc7\u8bbe\u7f6ehealth_check\u5173\u952e\u5b57\u542f\u7528\u4e86\u5065\u5eb7\u68c0\u67e5\u529f\u80fd\u3002Nginx\u4f1a\u5b9a\u671f\u53d1\u9001\u8bf7\u6c42\u5230\u540e\u7aef\u670d\u52a1\u5668\uff0c\u5e76\u6839\u636e\u8fd4\u56de\u7684\u72b6\u6001\u7801\u5224\u65ad\u670d\u52a1\u5668\u7684\u53ef\u7528\u6027\u3002 \u5254\u9664\u6545\u969c\u670d\u52a1\u5668\u5f53\u670d\u52a1\u5668\u6545\u969c\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u624b\u52a8\u6216\u81ea\u52a8\u7684\u65b9\u5f0f\u5c06\u6545\u969c\u670d\u52a1\u5668\u5254\u9664\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\u914d\u7f6e\uff1a upstream backend { server backend1.example.com; server backend2.example.com down; 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