| --- |
| title: udp-logger |
| keywords: |
| - Apache APISIX |
| - API Gateway |
| - Plugin |
| - UDP Logger |
| description: This document contains information about the Apache APISIX udp-logger Plugin. |
| --- |
| |
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| |
| ## 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](../batch-processor.md) 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](../apisix-variable.md) or [Nginx](http://nginx.org/en/docs/varindex.html) 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](https://github.com/api7/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](https://github.com/api7/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](../batch-processor.md#configuration) for more information or setting your custom configuration. |
| |
| ### Example of default log format |
| |
| ```json |
| { |
| "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](../apisix-variable.md) or [Nginx](http://nginx.org/en/docs/varindex.html) 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: |
| |
| ```bash |
| admin_key=$(yq '.deployment.admin.admin_key[0].key' conf/config.yaml | sed 's/"//g') |
| ``` |
| |
| ::: |
| |
| ```shell |
| 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: |
| |
| ```json |
| {"@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: |
| |
| ```shell |
| 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: |
| |
| ```shell |
| 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. |
| |
| ```shell |
| 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 |
| } |
| } |
| }' |
| ``` |
