Nginx

...
http {
   ...
   upstream your-upstreamname {
     server upstream-ip:upstream-port;
  }
   server {
   ...
   location / {
   root  html;
   index  index.html index.htm;
   proxy_pass http://yourupstreamname;
}}}

# 开启 http_api_module
server {
  listen 8080;
  location /api {
     api write=on;
  }
}
# 监控更多指标
server {
  listen 80;
  status_zone <ZONE_NAME>;
  ...
}

[inputs.nginx.tags]
 # some_tag = "some_value"
 # more_tag = "some_other_value"
 # ...

[[inputs.nginx]]
  ...
  [inputs.nginx.log]
    files = ["/var/log/nginx/access.log","/var/log/nginx/error.log"]

2021/04/21 09:24:04 [alert] 7#7: *168 write() to "/var/log/nginx/access.log" failed (28: No space left on device) while logging request, client: 120.204.196.129, server: localhost, request: "GET / HTTP/1.1", host: "47.98.103.73"

2021/04/29 16:24:38 [emerg] 50102#0: unexpected ";" in /usr/local/etc/nginx/nginx.conf:23

127.0.0.1 - - [24/Mar/2021:13:54:19 +0800] "GET /basic_status HTTP/1.1" 200 97 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 11_1_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.72 Safari/537.36"

$ nginx -v
nginx version: nginx/1.18.0 (Ubuntu)

tar zxf linux-amd64-nginx-ot16-ngx_http_module.so.tgz -C /usr/lib/nginx/modules

load_module modules/ngx_http_opentracing_module.so;

opentracing_load_tracer /etc/nginx/tracer/libdd_opentracing.so /etc/nginx/tracer/dd.json;
opentracing on; # Enable OpenTracing
opentracing_tag http_user_agent $http_user_agent;
opentracing_trace_locations off;
opentracing_propagate_context;
opentracing_operation_name nginx-$host;

{
  "environment": "test",
  "service": "nginx",
  "operation_name_override": "nginx.handle",
  "agent_host": "localhost",
  "agent_port": 9529
}

log_format with_trace_id '$remote_addr - $http_x_forwarded_user [$time_local] "$request" '
                         '$status $body_bytes_sent "$http_referer" '
                         '"$http_user_agent" "$http_x_forwarded_for" '
                         '"$opentracing_context_x_datadog_trace_id" "$opentracing_context_x_datadog_parent_id"';

access_log /var/log/nginx/access-with-trace.log with_trace_id;

$:/etc/nginx# nginx -t
info: DATADOG TRACER CONFIGURATION - {"agent_url":"http://localhost:9529","analytics_enabled":false,"analytics_sample_rate":null,"date":"2023-09-25T14:33:40+0800","enabled":true,"env":"prod","lang":"cpp","lang_version":"201402","operation_name_override":"nginx.handle","report_hostname":false,"sampling_rules":"[]","service":"nginx","version":"v1.3.7"}
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful

location ^~ / {
    ...
    proxy_set_header X-datadog-trace-id $opentracing_context_x_datadog_trace_id;
    proxy_set_header X-datadog-parent-id $opentracing_context_x_datadog_parent_id;
    ...
    }

root@liurui:/etc/nginx/tracer# nginx -s reload
info: DATADOG TRACER CONFIGURATION - {"agent_url":"http://localhost:9529","analytics_enabled":false,"analytics_sample_rate":null,"date":"2023-09-25T11:30:10+0800","enabled":true,"env":"prod","lang":"cpp","lang_version":"201402","operation_name_override":"nginx.handle","report_hostname":false,"sampling_rules":"[]","service":"nginx","version":"v1.3.7"}
root@liurui:/etc/nginx/tracer# 

root@liurui:/etc/nginx/conf.d# nginx -s reload
info: DATADOG TRACER CONFIGURATION - {"agent_url":"http://localhost:9529","analytics_enabled":false,"analytics_sample_rate":null,"date":"2023-09-25T12:28:53+0800","enabled":true,"env":"prod","lang":"cpp","lang_version":"201402","operation_name_override":"nginx.handle","report_hostname":false,"sampling_rules":"[]","service":"nginx","version":"v1.3.7"}
nginx: [warn] could not build optimal proxy_headers_hash, you should increase either proxy_headers_hash_max_size: 512 or proxy_headers_hash_bucket_size: 64; ignoring proxy_headers_hash_bucket_size

http {

    ...
    proxy_headers_hash_max_size 1024;
    proxy_headers_hash_bucket_size 128;

    ...
}