nginx-openresty通过location调用显示upstream信息

背景

有时候查看nginx的upstream配置得知配置后端的ip地址和端口，但从日志里面发现提示后端不存在，想知道nginx的内存里面是否存在upstream的加载信息，判断后端是否真正的存活

示例

nginx版本: openresty

# /usr/local/openresty/nginx/sbin/nginx -v
nginx version: openresty/1.15.8.3

关键配置信息

	location = /upstream_show {
	set $upstream_svc "show-upstreams";
        	    upstream_show;
        }

具体配置-在server字段引进

    server {
    set $upstream_svc "-";
        listen       80;
        server_name  bp-inner-gateway-dev.2haohr.com;
        access_log /var/log/nginx/bp-inner-gateway-dev.2haohr.com-access.log main;
        error_log /var/log/nginx/bp-inner-gateway-dev.2haohr.com-error.log;
        client_header_buffer_size 256k;
        large_client_header_buffers 4 256k;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $http_host;
        proxy_read_timeout  3600;
        proxy_connect_timeout       1;
        proxy_buffering off;

	location = /upstream_show {
	set $upstream_svc "show-upstreams";
        	    upstream_show;
        }

	include /etc/nginx/conf.d/bp-inner-gateway-dev.2haohr.com/*.conf;
   }

效果

# curl http://bp-inner-gateway-dev.2haohr.com/upstream_show
Upstream name: eebo.ehr.salesclue; Backend server count: 1
        server 10.21.0.11:15390 weight=1 max_fails=2 fail_timeout=10s;

Upstream name: eebo.ehr.metric_performance; Backend server count: 1
        server 10.21.0.10:9191 weight=1 max_fails=2 fail_timeout=10s;

Upstream name: eebo.ehr.salescenter; Backend server count: 1
        server 10.21.0.11:15250 weight=1 max_fails=2 fail_timeout=10s;

Upstream name: ehr-order_center; Backend server count: 1
        server 10.21.0.11:48010 weight=1 max_fails=2 fail_timeout=10s;