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udp-logger
Apache APISIX
API Gateway
Plugin
UDP Logger
This document contains information about the Apache APISIX udp-logger Plugin.

Description

The udp-logger Plugin can be used to push log data requests to UDP servers.

This provides the ability to send log data requests as JSON objects to monitoring tools and other UDP servers.

This plugin also allows to push logs as a batch to your external UDP server. It might take some time to receive the log data. It will be automatically sent after the timer function in the batch processor expires.

Attributes

Name Type Required Default Valid values Description
host string True IP address or the hostname of the UDP server.
port integer True [0,...] Target upstream port.
timeout integer False 3 [1,...] Timeout for the upstream to send data.
log_format object False Log format declared as key value pairs in JSON format. Values only support strings. APISIX or Nginx variables can be used by prefixing the string with $.
name string False "udp logger" Unique identifier for the batch processor. If you use Prometheus to monitor APISIX metrics, the name is exported in apisix_batch_process_entries. processor.
include_req_body boolean False false [false, true] When set to true includes the request body in the log.
include_req_body_expr array No Filter for when the include_req_body attribute is set to true. Request body is only logged when the expression set here evaluates to true. See lua-resty-expr for more.
include_resp_body boolean No false [false, true] When set to true includes the response body in the log.
include_resp_body_expr array No Filter for when the include_resp_body attribute is set to true. Response body is only logged when the expression set here evaluates to true. See lua-resty-expr for more.

This Plugin supports using batch processors to aggregate and process entries (logs/data) in a batch. This avoids the need for frequently submitting the data. The batch processor submits data every 5 seconds or when the data in the queue reaches 1000. See Batch Processor for more information or setting your custom configuration.

Example of default log format

{
  "apisix_latency": 99.999988555908,
  "service_id": "",
  "server": {
    "version": "3.7.0",
    "hostname": "localhost"
  },
  "request": {
    "method": "GET",
    "headers": {
      "connection": "close",
      "host": "localhost"
    },
    "url": "http://localhost:1984/opentracing",
    "size": 65,
    "querystring": {},
    "uri": "/opentracing"
  },
  "start_time": 1704527399740,
  "client_ip": "127.0.0.1",
  "response": {
    "status": 200,
    "size": 136,
    "headers": {
      "server": "APISIX/3.7.0",
      "content-type": "text/plain",
      "transfer-encoding": "chunked",
      "connection": "close"
    }
  },
  "upstream": "127.0.0.1:1982",
  "route_id": "1",
  "upstream_latency": 12,
  "latency": 111.99998855591
}

Metadata

You can also set the format of the logs by configuring the Plugin metadata. The following configurations are available:

Name Type Required Default Description
log_format object False Log format declared as key value pairs in JSON format. Values only support strings. APISIX or Nginx variables can be used by prefixing the string with $.

:::info IMPORTANT

Configuring the Plugin metadata is global in scope. This means that it will take effect on all Routes and Services which use the udp-logger Plugin.

:::

The example below shows how you can configure through the Admin API:

:::note You can fetch the admin_key from config.yaml and save to an environment variable with the following command:

admin_key=$(yq '.deployment.admin.admin_key[0].key' conf/config.yaml | sed 's/"//g')

:::

curl http://127.0.0.1:9180/apisix/admin/plugin_metadata/udp-logger -H "X-API-KEY: $admin_key" -X PUT -d '
{
    "log_format": {
        "host": "$host",
        "@timestamp": "$time_iso8601",
        "client_ip": "$remote_addr"
    }
}'

With this configuration, your logs would be formatted as shown below:

{"@timestamp":"2023-01-09T14:47:25+08:00","route_id":"1","host":"localhost","client_ip":"127.0.0.1"}

Enable Plugin

The example below shows how you can enable the Plugin on a specific Route:

curl http://127.0.0.1:9180/apisix/admin/routes/5 -H "X-API-KEY: $admin_key" -X PUT -d '
{
      "plugins": {
            "udp-logger": {
                 "host": "127.0.0.1",
                 "port": 3000,
                 "batch_max_size": 1,
                 "name": "udp logger"
            }
       },
      "upstream": {
           "type": "roundrobin",
           "nodes": {
               "127.0.0.1:1980": 1
           }
      },
      "uri": "/hello"
}'

Example usage

Now, if you make a request to APISIX, it will be logged in your UDP server:

curl -i http://127.0.0.1:9080/hello

Delete Plugin

To remove the udp-logger Plugin, you can delete the corresponding JSON configuration from the Plugin configuration. APISIX will automatically reload and you do not have to restart for this to take effect.

curl http://127.0.0.1:9180/apisix/admin/routes/1 -H "X-API-KEY: $admin_key" -X PUT -d '
{
    "methods": ["GET"],
    "uri": "/hello",
    "plugins": {},
    "upstream": {
        "type": "roundrobin",
        "nodes": {
            "127.0.0.1:1980": 1
        }
    }
}'