负载均衡模板

适合多个同构后端服务共同承载流量。

替换：

• example.com
• 127.0.0.1:3001
• 127.0.0.1:3002
• 127.0.0.1:3003

upstream backend_upstream {
    least_conn;

    server 127.0.0.1:3001 max_fails=3 fail_timeout=30s;
    server 127.0.0.1:3002 max_fails=3 fail_timeout=30s;
    server 127.0.0.1:3003 backup;
}

server {
    listen 80;
    listen [::]:80;
    server_name example.com;

    access_log /var/log/nginx/example.com.access.log;
    error_log /var/log/nginx/example.com.error.log;

    client_max_body_size 20m;

    location / {
        proxy_pass http://backend_upstream;
        proxy_http_version 1.1;

        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;

        proxy_connect_timeout 30s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;
    }
}