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308 lines
8.4 KiB
308 lines
8.4 KiB
.. _config_access_log: |
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Access logging |
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============== |
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Configuration |
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------------------------- |
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Access logs are configured as part of the :ref:`HTTP connection manager config |
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<config_http_conn_man>` or :ref:`TCP Proxy <config_network_filters_tcp_proxy>`. |
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.. code-block:: json |
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{ |
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"access_log": [ |
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{ |
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"path": "...", |
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"format": "...", |
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"filter": "{...}", |
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}, |
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] |
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} |
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.. _config_access_log_path_param: |
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path |
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*(required, string)* Path the access log is written to. |
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.. _config_access_log_format_param: |
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format |
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*(optional, string)* Access log format. Envoy supports :ref:`custom access log formats |
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<config_access_log_format>` as well as a :ref:`default format |
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<config_access_log_default_format>`. |
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.. _config_access_log_filter_param: |
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filter |
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*(optional, object)* :ref:`Filter <config_http_con_manager_access_log_filters>` which is used to |
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determine if the access log needs to be written. |
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.. _config_access_log_format: |
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Format rules |
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------------ |
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The access log format string contains either command operators or other characters interpreted as a |
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plain string. The access log formatter does not make any assumptions about a new line separator, so one |
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has to specified as part of the format string. |
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See the :ref:`default format <config_access_log_default_format>` for an example. |
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Note that the access log line will contain a '-' character for every not set/empty value. |
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The same format strings are used by different types of access logs (such as HTTP and TCP). Some |
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fields may have slightly different meanings, depending on what type of log it is. Differences |
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are noted. |
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The following command operators are supported: |
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%START_TIME% |
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HTTP |
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Request start time including milliseconds. |
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TCP |
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Downstream connection start time including milliseconds. |
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%BYTES_RECEIVED% |
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HTTP |
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Body bytes received. |
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TCP |
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Downstream bytes received on connection. |
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%PROTOCOL% |
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HTTP |
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Protocol. Currently either *HTTP/1.1* or *HTTP/2*. |
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TCP |
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Not implemented ("-"). |
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%RESPONSE_CODE% |
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HTTP |
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HTTP response code. Note that a response code of '0' means that the server never sent the |
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beginning of a response. This generally means that the (downstream) client disconnected. |
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TCP |
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Not implemented ("-"). |
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%BYTES_SENT% |
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HTTP |
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Body bytes sent. |
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TCP |
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Downstream bytes sent on connection. |
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%DURATION% |
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HTTP |
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Total duration in milliseconds of the request from the start time to the last byte out. |
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TCP |
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Total duration in milliseconds of the downstream connection. |
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%RESPONSE_FLAGS% |
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Additional details about the response or connection, if any. For TCP connections, the response codes mentioned in |
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the descriptions do not apply. Possible values are: |
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HTTP and TCP |
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* **UH**: No healthy upstream hosts in upstream cluster in addition to 503 response code. |
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* **UF**: Upstream connection failure in addition to 503 response code. |
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* **UO**: Upstream overflow (:ref:`circuit breaking <arch_overview_circuit_break>`) in addition to 503 response code. |
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* **NR**: No :ref:`route configured <arch_overview_http_routing>` for a given request in addition to 404 response code. |
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HTTP only |
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* **LH**: Local service failed :ref:`health check request <arch_overview_health_checking>` in addition to 503 response code. |
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* **UT**: Upstream request timeout in addition to 504 response code. |
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* **LR**: Connection local reset in addition to 503 response code. |
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* **UR**: Upstream remote reset in addition to 503 response code. |
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* **UC**: Upstream connection termination in addition to 503 response code. |
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* **DI**: The request processing was delayed for a period specified via :ref:`fault injection <config_http_filters_fault_injection>`. |
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* **FI**: The request was aborted with a response code specified via :ref:`fault injection <config_http_filters_fault_injection>`. |
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* **RL**: The request was ratelimited locally by the :ref:`HTTP rate limit filter <config_http_filters_rate_limit>` in addition to 429 response code. |
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%UPSTREAM_HOST% |
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Upstream host URL (e.g., tcp://ip:port for TCP connections). |
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%UPSTREAM_CLUSTER% |
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Upstream cluster to which the upstream host belongs to. |
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%REQ(X?Y):Z% |
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HTTP |
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An HTTP request header where X is the main HTTP header, Y is the alternative one, and Z is an |
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optional parameter denoting string truncation up to Z characters long. The value is taken from |
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the HTTP request header named X first and if it's not set, then request header Y is used. If |
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none of the headers are present '-' symbol will be in the log. |
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TCP |
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Not implemented ("-"). |
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%RESP(X?Y):Z% |
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HTTP |
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Same as **%REQ(X?Y):Z%** but taken from HTTP response headers. |
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TCP |
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Not implemented ("-"). |
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.. _config_access_log_default_format: |
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Default format |
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-------------- |
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If custom format is not specified, Envoy uses the following default format: |
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.. code-block:: none |
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[%START_TIME%] "%REQ(:METHOD)% %REQ(X-ENVOY-ORIGINAL-PATH?:PATH)% %PROTOCOL%" |
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%RESPONSE_CODE% %RESPONSE_FLAGS% %BYTES_RECEIVED% %BYTES_SENT% %DURATION% |
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%RESP(X-ENVOY-UPSTREAM-SERVICE-TIME)% "%REQ(X-FORWARDED-FOR)%" "%REQ(USER-AGENT)%" |
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"%REQ(X-REQUEST-ID)%" "%REQ(:AUTHORITY)%" "%UPSTREAM_HOST%"\n |
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Example of the default Envoy access log format: |
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.. code-block:: none |
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[2016-04-15T20:17:00.310Z] "POST /api/v1/locations HTTP/2" 204 - 154 0 226 100 "10.0.35.28" |
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"nsq2http" "cc21d9b0-cf5c-432b-8c7e-98aeb7988cd2" "locations" "tcp://10.0.2.1:80" |
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.. _config_http_con_manager_access_log_filters: |
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Filters |
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------- |
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Envoy supports the following access log filters: |
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.. contents:: |
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:local: |
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Status code |
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^^^^^^^^^^^ |
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.. code-block:: json |
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{ |
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"filter": { |
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"type": "status_code", |
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"op": "...", |
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"value": "...", |
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"runtime_key": "..." |
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} |
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} |
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Filters on HTTP response/status code. |
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op |
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*(required, string)* Comparison operator. Currently *>=* and *=* are the only supported operators. |
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value |
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*(required, integer)* Default value to compare against if runtime value is not available. |
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runtime_key |
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*(optional, string)* Runtime key to get value for comparision. This value is used if defined. |
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Duration |
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^^^^^^^^ |
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.. code-block:: json |
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{ |
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"filter": { |
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"type": "duration", |
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"op": "..", |
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"value": "...", |
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"runtime_key": "..." |
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} |
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} |
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Filters on total request duration in milliseconds. |
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op |
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*(required, string)* Comparison operator. Currently *>=* and *=* are the only supported operators. |
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value |
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*(required, integer)* Default value to compare against if runtime values is not available. |
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runtime_key |
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*(optional, string)* Runtime key to get value for comparision. This value is used if defined. |
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Not health check |
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^^^^^^^^^^^^^^^^ |
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.. code-block:: json |
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{ |
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"filter": { |
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"type": "not_healthcheck" |
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} |
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} |
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Filters for requests that are not health check requests. A health check request is marked by |
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the :ref:`health check filter <config_http_filters_health_check>`. |
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Traceable |
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^^^^^^^^^ |
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.. code-block:: json |
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{ |
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"filter": { |
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"type": "traceable_request" |
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} |
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} |
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Filters for requests that are traceable. See the :ref:`tracing overview <arch_overview_tracing>` for |
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more information on how a request becomes traceable. |
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.. _config_http_con_manager_access_log_filters_runtime: |
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Runtime |
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^^^^^^^^^ |
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.. code-block:: json |
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{ |
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"filter": { |
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"type": "runtime", |
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"key" : "..." |
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} |
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} |
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Filters for random sampling of requests. Sampling pivots on the header |
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:ref:`x-request-id<config_http_conn_man_headers_x-request-id>` being present. If |
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:ref:`x-request-id<config_http_conn_man_headers_x-request-id>` is present, the filter will |
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consistently sample across multiple hosts based on the runtime key value and the value extracted |
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from :ref:`x-request-id<config_http_conn_man_headers_x-request-id>`. If it is missing, the |
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filter will randomly sample based on the runtime key value. |
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key |
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*(required, string)* Runtime key to get the percentage of requests to be sampled. |
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This runtime control is specified in the range 0-100 and defaults to 0. |
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And |
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^^^ |
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.. code-block:: json |
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{ |
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"filter": { |
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"type": "logical_and", |
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"filters": [] |
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} |
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} |
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Performs a logical "and" operation on the result of each filter in *filters*. Filters are evaluated |
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sequentially and if one of them returns false, the filter returns false immediately. |
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Or |
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^^ |
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.. code-block:: json |
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{ |
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"filter": { |
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"type": "logical_or", |
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"filters": [] |
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} |
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} |
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Performs a logical "or" operation on the result of each individual filter. Filters are evaluated |
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sequentially and if one of them returns true, the filter returns true immediately.
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