Fluent Bit 문서/트러블슈팅

1 개요

Troubleshooting

트러블슈팅

• 탭 기능: 이벤트 또는 레코드 생성
• 내부 / 시그널 덤프

2 탭 기능

탭(tap)을 사용하면 Fluent Bit를 통해 전달되는 메시지, 시간, 관련 필터를 자세히 설명하는 이벤트 또는 레코드를 생성할 수 있습니다.

2.1 간단한 예시

먼저, 사용할 컨테이너 이미지가 실제로 탭(Fluent Bit 2.0 이상에서 사용 가능)을 지원하는지 확인합니다.

$ docker run --rm -ti fluent/fluent-bit:latest --help | grep trace
  -Z, --enable-chunk-traceenable chunk tracing, it can be activated either through the http api or the command line
  --trace-input           input to start tracing on startup.
  --trace-output          output to use for tracing on startup.
  --trace-output-property set a property for output tracing on startup.
  --trace                 setup a trace pipeline on startup. Uses a single line, ie: "input=dummy.0 output=stdout output.format='json'"

--enable-chunk-trace 옵션이 있으면 Fluent Bit가 탭을 지원하지만, 기본적으로 비활성화되어 있으므로 이 옵션을 사용하여 활성화해야 합니다.

다음과 같이 trace-input 및 trace-output 속성을 사용하여 처음부터 추적이 활성화된 fluent-bit를 시작할 수 있습니다.

$ fluent-bit -Z -i dummy -o stdout -f 1 --trace-input=dummy.0 --trace-output=stdout
Fluent Bit v2.1.8
* Copyright (C) 2015-2022 The Fluent Bit Authors
* Fluent Bit is a CNCF sub-project under the umbrella of Fluentd
* https://fluentbit.io

[2023/07/21 16:27:01] [ info] [fluent bit] version=2.1.8, commit=824ba3dd08, pid=622937
[2023/07/21 16:27:01] [ info] [storage] ver=1.4.0, type=memory, sync=normal, checksum=off, max_chunks_up=128
[2023/07/21 16:27:01] [ info] [cmetrics] version=0.6.3
[2023/07/21 16:27:01] [ info] [ctraces ] version=0.3.1
[2023/07/21 16:27:01] [ info] [input:dummy:dummy.0] initializing
[2023/07/21 16:27:01] [ info] [input:dummy:dummy.0] storage_strategy='memory' (memory only)
[2023/07/21 16:27:01] [ info] [sp] stream processor started
[2023/07/21 16:27:01] [ info] [output:stdout:stdout.0] worker #0 started
[2023/07/21 16:27:01] [ info] [fluent bit] version=2.1.8, commit=824ba3dd08, pid=622937
[2023/07/21 16:27:01] [ info] [storage] ver=1.4.0, type=memory, sync=normal, checksum=off, max_chunks_up=128
[2023/07/21 16:27:01] [ info] [cmetrics] version=0.6.3
[2023/07/21 16:27:01] [ info] [ctraces ] version=0.3.1
[2023/07/21 16:27:01] [ info] [input:emitter:trace-emitter] initializing
[2023/07/21 16:27:01] [ info] [input:emitter:trace-emitter] storage_strategy='memory' (memory only)
[2023/07/21 16:27:01] [ info] [sp] stream processor started
[2023/07/21 16:27:01] [ info] [output:stdout:stdout.0] worker #0 started
.[0] dummy.0: [[1689971222.068537501, {}], {"message"=>"dummy"}]
[0] dummy.0: [[1689971223.068556121, {}], {"message"=>"dummy"}]
[0] trace: [[1689971222.068677045, {}], {"type"=>1, "trace_id"=>"0", "plugin_instance"=>"dummy.0", "records"=>[{"timestamp"=>1689971222, "record"=>{"message"=>"dummy"}}], "start_time"=>1689971222, "end_time"=>1689971222}]
[1] trace: [[1689971222.068735577, {}], {"type"=>3, "trace_id"=>"0", "plugin_instance"=>"dummy.0", "records"=>[{"timestamp"=>1689971222, "record"=>{"message"=>"dummy"}}], "start_time"=>1689971222, "end_time"=>1689971222}]
[0] dummy.0: [[1689971224.068586317, {}], {"message"=>"dummy"}]
[0] trace: [[1689971223.068626923, {}], {"type"=>1, "trace_id"=>"1", "plugin_instance"=>"dummy.0", "records"=>[{"timestamp"=>1689971223, "record"=>{"message"=>"dummy"}}], "start_time"=>1689971223, "end_time"=>1689971223}]
[1] trace: [[1689971223.068675735, {}], {"type"=>3, "trace_id"=>"1", "plugin_instance"=>"dummy.0", "records"=>[{"timestamp"=>1689971223, "record"=>{"message"=>"dummy"}}], "start_time"=>1689971223, "end_time"=>1689971223}]
[2] trace: [[1689971224.068689341, {}], {"type"=>1, "trace_id"=>"2", "plugin_instance"=>"dummy.0", "records"=>[{"timestamp"=>1689971224, "record"=>{"message"=>"dummy"}}], "start_time"=>1689971224, "end_time"=>1689971224}]
[3] trace: [[1689971224.068747182, {}], {"type"=>3, "trace_id"=>"2", "plugin_instance"=>"dummy.0", "records"=>[{"timestamp"=>1689971224, "record"=>{"message"=>"dummy"}}], "start_time"=>1689971224, "end_time"=>1689971224}]
^C[2023/07/21 16:27:05] [engine] caught signal (SIGINT)
[2023/07/21 16:27:05] [ warn] [engine] service will shutdown in max 5 seconds
[2023/07/21 16:27:05] [ info] [input] pausing dummy.0
[0] dummy.0: [[1689971225.068568875, {}], {"message"=>"dummy"}]
[2023/07/21 16:27:06] [ info] [engine] service has stopped (0 pending tasks)
[2023/07/21 16:27:06] [ info] [input] pausing dummy.0
[2023/07/21 16:27:06] [ warn] [engine] service will shutdown in max 1 seconds
[0] trace: [[1689971225.068654038, {}], {"type"=>1, "trace_id"=>"3", "plugin_instance"=>"dummy.0", "records"=>[{"timestamp"=>1689971225, "record"=>{"message"=>"dummy"}}], "start_time"=>1689971225, "end_time"=>1689971225}]
[1] trace: [[1689971225.068695829, {}], {"type"=>3, "trace_id"=>"3", "plugin_instance"=>"dummy.0", "records"=>[{"timestamp"=>1689971225, "record"=>{"message"=>"dummy"}}], "start_time"=>1689971225, "end_time"=>1689971225}]
[2023/07/21 16:27:07] [ info] [engine] service has stopped (0 pending tasks)
[2023/07/21 16:27:07] [ info] [output:stdout:stdout.0] thread worker #0 stopping...
[2023/07/21 16:27:07] [ info] [output:stdout:stdout.0] thread worker #0 stopped
[2023/07/21 16:27:07] [ info] [output:stdout:stdout.0] thread worker #0 stopping...
[2023/07/21 16:27:07] [ info] [output:stdout:stdout.0] thread worker #0 stopped

다음 경고가 표시되면 -Z 또는 --enable-chunk-tracing 옵션이 누락된 것입니다.

[2023/07/21 16:26:42] [ warn] [chunk trace] enable chunk tracing via the configuration or  command line to be able to activate tracing.

다음과 같이 --trace-output-property 옵션을 사용하여 출력에 대한 속성을 설정할 수 있습니다 .

$ fluent-bit -Z -i dummy -o stdout -f 1 --trace-input=dummy.0 --trace-output=stdout --trace-output-property=format=json_lines
Fluent Bit v2.1.8
* Copyright (C) 2015-2022 The Fluent Bit Authors
* Fluent Bit is a CNCF sub-project under the umbrella of Fluentd
* https://fluentbit.io

[2023/07/21 16:28:59] [ info] [fluent bit] version=2.1.8, commit=824ba3dd08, pid=623170
[2023/07/21 16:28:59] [ info] [storage] ver=1.4.0, type=memory, sync=normal, checksum=off, max_chunks_up=128
[2023/07/21 16:28:59] [ info] [cmetrics] version=0.6.3
[2023/07/21 16:28:59] [ info] [ctraces ] version=0.3.1
[2023/07/21 16:28:59] [ info] [input:dummy:dummy.0] initializing
[2023/07/21 16:28:59] [ info] [input:dummy:dummy.0] storage_strategy='memory' (memory only)
[2023/07/21 16:28:59] [ info] [sp] stream processor started
[2023/07/21 16:28:59] [ info] [output:stdout:stdout.0] worker #0 started
[2023/07/21 16:28:59] [ info] [fluent bit] version=2.1.8, commit=824ba3dd08, pid=623170
[2023/07/21 16:28:59] [ info] [storage] ver=1.4.0, type=memory, sync=normal, checksum=off, max_chunks_up=128
[2023/07/21 16:28:59] [ info] [cmetrics] version=0.6.3
[2023/07/21 16:28:59] [ info] [ctraces ] version=0.3.1
[2023/07/21 16:28:59] [ info] [input:emitter:trace-emitter] initializing
[2023/07/21 16:28:59] [ info] [input:emitter:trace-emitter] storage_strategy='memory' (memory only)
[2023/07/21 16:29:00] [ info] [sp] stream processor started
[2023/07/21 16:29:00] [ info] [output:stdout:stdout.0] worker #0 started
.[0] dummy.0: [[1689971340.068565891, {}], {"message"=>"dummy"}]
[0] dummy.0: [[1689971341.068632477, {}], {"message"=>"dummy"}]
{"date":1689971340.068745,"type":1,"trace_id":"0","plugin_instance":"dummy.0","records":[{"timestamp":1689971340,"record":{"message":"dummy"}}],"start_time":1689971340,"end_time":1689971340}
{"date":1689971340.068825,"type":3,"trace_id":"0","plugin_instance":"dummy.0","records":[{"timestamp":1689971340,"record":{"message":"dummy"}}],"start_time":1689971340,"end_time":1689971340}
[0] dummy.0: [[1689971342.068613646, {}], {"message"=>"dummy"}]

해당 옵션을 설정하면 stdout 플러그인은 이제 다음과 같이 json_lines 형식으로 추적을 내보냅니다.

{"date":1689971340.068745,"type":1,"trace_id":"0","plugin_instance":"dummy.0","records":[{"timestamp":1689971340,"record":{"message":"dummy"}}],"start_time":1689971340,"end_time":1689971340}

세 가지 옵션 모두 훨씬 더 유연한 --trace 옵션을 사용하여 정의할 수도 있습니다.

$ fluent-bit -Z -i dummy -o stdout -f 1 --trace="input=dummy.0 output=stdout output.format=json_lines"

input=dummy.0 output=stdout output.format=json_lines 설정을 사용하여, 다음과 같은 전체 탭 파이프라인이 정의되었습니다 .

• input: dummy.0 (태그 및 별칭 dummy.0를 listen)
• output: stdout (stdout 플러그인으로 출력)
• output.format: json_lines (stdout 포맷 json_lines 설정)

탭 지원은 내장된 웹서버를 통해서도 활성화 및 비활성화할 수 있습니다.

$ docker run --rm -ti -p 2020:2020 fluent/fluent-bit:latest -Z -H -i dummy -p alias=input_dummy -o stdout -f 1
Fluent Bit v2.0.0
* Copyright (C) 2015-2022 The Fluent Bit Authors
* Fluent Bit is a CNCF sub-project under the umbrella of Fluentd
* https://fluentbit.io

[2022/10/21 10:03:16] [ info] [fluent bit] version=2.0.0, commit=3000f699f2, pid=1
[2022/10/21 10:03:16] [ info] [output:stdout:stdout.0] worker #0 started
[2022/10/21 10:03:16] [ info] [storage] ver=1.3.0, type=memory, sync=normal, checksum=off, max_chunks_up=128
[2022/10/21 10:03:16] [ info] [cmetrics] version=0.5.2
[2022/10/21 10:03:16] [ info] [input:dummy:input_dummy] initializing
[2022/10/21 10:03:16] [ info] [input:dummy:input_dummy] storage_strategy='memory' (memory only)
[2022/10/21 10:03:16] [ info] [http_server] listen iface=0.0.0.0 tcp_port=2020
[2022/10/21 10:03:16] [ info] [sp] stream processor started
[0] dummy.0: [1666346597.203307010, {"message"=>"dummy"}]
[0] dummy.0: [1666346598.204103793, {"message"=>"dummy"}]
...

다른 터미널에서는 입력 dummy.0 또는 그 별칭의 인스턴스 ID를 사용하여 탭을 활성화할 수 있습니다. .

별칭은 더 예측 가능하므로 다음을 사용합니다.

$ curl 127.0.0.1:2020/api/v1/trace/input_dummy
{"status":"ok"}

이 응답은 탭을 활성화했음을 의미합니다. 이제 Fluent Bit가 실행되는 터미널에는 다음과 같은 내용이 보일 것입니다.

[0] dummy.0: [1666346615.203253156, {"message"=>"dummy"}]
[2022/10/21 10:03:36] [ info] [fluent bit] version=2.0.0, commit=3000f699f2, pid=1
[2022/10/21 10:03:36] [ info] [storage] ver=1.3.0, type=memory, sync=normal, checksum=off, max_chunks_up=128
[2022/10/21 10:03:36] [ info] [cmetrics] version=0.5.2
[2022/10/21 10:03:36] [ info] [input:emitter:trace-emitter] initializing
[2022/10/21 10:03:36] [ info] [input:emitter:trace-emitter] storage_strategy='memory' (memory only)
[2022/10/21 10:03:36] [ info] [sp] stream processor started
[2022/10/21 10:03:36] [ info] [output:stdout:stdout.0] worker #0 started
[0] dummy.0: [1666346616.203551736, {"message"=>"dummy"}]
[0] trace: [1666346617.205221952, {"type"=>1, "trace_id"=>"trace.0", "plugin_instance"=>"dummy.0", "plugin_alias"=>"input_dummy", "records"=>[{"timestamp"=>1666346617, "record"=>{"message"=>"dummy"}}], "start_time"=>1666346617, "end_time"=>1666346617}]
[0] dummy.0: [1666346617.205131790, {"message"=>"dummy"}]
[0] trace: [1666346617.205419358, {"type"=>3, "trace_id"=>"trace.0", "plugin_instance"=>"dummy.0", "plugin_alias"=>"input_dummy", "records"=>[{"timestamp"=>1666346617, "record"=>{"message"=>"dummy"}}], "start_time"=>1666346617, "end_time"=>1666346617}]
[0] trace: [1666346618.204110867, {"type"=>1, "trace_id"=>"trace.1", "plugin_instance"=>"dummy.0", "plugin_alias"=>"input_dummy", "records"=>[{"timestamp"=>1666346618, "record"=>{[0] dummy.0: [1666346618.204049246, {"message"=>"dummy"}]
"message"=>"dummy"}}], "start_time"=>1666346618, "end_time"=>1666346618}]
[0] trace: [1666346618.204198654, {"type"=>3, "trace_id"=>"trace.1", "plugin_instance"=>"dummy.0", "plugin_alias"=>"input_dummy", "records"=>[{"timestamp"=>1666346618, "record"=>{"message"=>"dummy"}}], "start_time"=>1666346618, "end_time"=>1666346618}]

이제 표시되는 모든 레코드는 더미 플러그인의 활동에 의해 생성된 레코드입니다.

4 참고

• https://docs.fluentbit.io/manual/administration/troubleshooting