동기 부여

로컬 PC에 Rancher로 k8s 클러스터를 세우고,
캬캬캇하면서 스스로 만든 앱을 움직이면,
에러가 나와서 짜증나게 되었다.

에러 로그를 추적하려고 생각했지만, 재미있는 전부 컨테이너의 수를 5로 한 결과,
어느 Pod에서 로그가 토해지고 있는지 모르게 되었다.

이 고민, 해소하고 싶다.

이 기사의 오치

tail -f /var/log/containers/${ワークロード名}-${なんかのID}-*

별표의 곳은, Pod의 ID가 들어가는 것 같다.

오류

정상시


↓ 놀이에 Pod를 스케일 해 연타한다.

오류

많은 포드

흠. 어떻게 하자.

잘 보면, Pod의 이름에 공통점이 있다.
첫 번째 워크로드 이름 + 무엇인가의 ID

rancher 로그의 항목을 본다.

/var/log/containers에있을 것 같습니다.

고리를 눌러 tail

tail -f /var/log/containers/sharemd-api-576f57c8fd-*

↓이런 느낌으로 출력된다.

[root@ssmzenbook ~]# tail -f /var/log/containers/sharemd-api-576f57c8fd-* 
==> /var/log/containers/sharemd-api-576f57c8fd-5466q_default_sharemd-api-6f6eb7dbeacf4d2c6343671b24a84d93b2bcd15a6ab29444076d6365fa07c6b6.log <==
{"log":" * Serving Flask app \"main\" (lazy loading)\r\n","stream":"stdout","time":"2018-08-12T12:46:39.120671317Z"}
{"log":" * Environment: production\r\n","stream":"stdout","time":"2018-08-12T12:46:39.120720386Z"}
{"log":"\u001b[31m   WARNING: Do not use the development server in a production environment.\u001b[0m\r\n","stream":"stdout","time":"2018-08-12T12:46:39.120728501Z"}
{"log":"\u001b[2m   Use a production WSGI server instead.\u001b[0m\r\n","stream":"stdout","time":"2018-08-12T12:46:39.120801044Z"}
{"log":" * Debug mode: off\r\n","stream":"stdout","time":"2018-08-12T12:46:39.120815698Z"}
{"log":" * Running on http://0.0.0.0:5000/ (Press CTRL+C to quit)\r\n","stream":"stdout","time":"2018-08-12T12:46:39.132532425Z"}

==> /var/log/containers/sharemd-api-576f57c8fd-65s42_default_sharemd-api-a64cc910ceb9680dbedcda27fdfae1a7d4dc172db31185cbfd4ebefbab05b897.log <==
{"log":" * Serving Flask app \"main\" (lazy loading)\r\n","stream":"stdout","time":"2018-08-12T12:46:34.070577741Z"}
{"log":" * Environment: production\r\n","stream":"stdout","time":"2018-08-12T12:46:34.070627264Z"}
{"log":"\u001b[31m   WARNING: Do not use the development server in a production environment.\u001b[0m\r\n","stream":"stdout","time":"2018-08-12T12:46:34.07069189Z"}
{"log":"\u001b[2m   Use a production WSGI server instead.\u001b[0m\r\n","stream":"stdout","time":"2018-08-12T12:46:34.070704736Z"}
{"log":" * Debug mode: off\r\n","stream":"stdout","time":"2018-08-12T12:46:34.070710825Z"}
{"log":" * Running on http://0.0.0.0:5000/ (Press CTRL+C to quit)\r\n","stream":"stdout","time":"2018-08-12T12:46:34.082531548Z"}

==> /var/log/containers/sharemd-api-576f57c8fd-g95qw_default_sharemd-api-94c6acb805fd4c6d908caa8638ec6853d4e516033ace296e3f83b6d543a629c3.log <==
{"log":" * Serving Flask app \"main\" (lazy loading)\r\n","stream":"stdout","time":"2018-08-12T12:46:37.15602442Z"}
{"log":" * Environment: production\r\n","stream":"stdout","time":"2018-08-12T12:46:37.156067984Z"}
{"log":"\u001b[31m   WARNING: Do not use the development server in a production environment.\u001b[0m\r\n","stream":"stdout","time":"2018-08-12T12:46:37.156073009Z"}
{"log":"\u001b[2m   Use a production WSGI server instead.\u001b[0m\r\n","stream":"stdout","time":"2018-08-12T12:46:37.156154701Z"}
{"log":" * Debug mode: off\r\n","stream":"stdout","time":"2018-08-12T12:46:37.156167877Z"}
{"log":" * Running on http://0.0.0.0:5000/ (Press CTRL+C to quit)\r\n","stream":"stdout","time":"2018-08-12T12:46:37.16624707Z"}

==> /var/log/containers/sharemd-api-576f57c8fd-g9hws_default_sharemd-api-3a05ac4762256a86b42c7f3661d3663e71f067cf5b8314bff2da2bcbd4804c9e.log <==
{"log":" * Serving Flask app \"main\" (lazy loading)\r\n","stream":"stdout","time":"2018-08-12T12:46:29.003961061Z"}
{"log":" * Environment: production\r\n","stream":"stdout","time":"2018-08-12T12:46:29.003993907Z"}
{"log":"\u001b[31m   WARNING: Do not use the development server in a production environment.\u001b[0m\r\n","stream":"stdout","time":"2018-08-12T12:46:29.004071121Z"}
{"log":"\u001b[2m   Use a production WSGI server instead.\u001b[0m\r\n","stream":"stdout","time":"2018-08-12T12:46:29.004085122Z"}
{"log":" * Debug mode: off\r\n","stream":"stdout","time":"2018-08-12T12:46:29.00408865Z"}
{"log":" * Running on http://0.0.0.0:5000/ (Press CTRL+C to quit)\r\n","stream":"stdout","time":"2018-08-12T12:46:29.015052717Z"}

==> /var/log/containers/sharemd-api-576f57c8fd-lkzn8_default_sharemd-api-d33a7859c37afc16e08b6afc0613fa9918690d2ae3844111cebe36ec01cb0651.log <==
{"log":" * Serving Flask app \"main\" (lazy loading)\r\n","stream":"stdout","time":"2018-08-12T12:46:31.899536133Z"}
{"log":" * Environment: production\r\n","stream":"stdout","time":"2018-08-12T12:46:31.899571802Z"}
{"log":"\u001b[31m   WARNING: Do not use the development server in a production environment.\u001b[0m\r\n","stream":"stdout","time":"2018-08-12T12:46:31.899576595Z"}
{"log":"\u001b[2m   Use a production WSGI server instead.\u001b[0m\r\n","stream":"stdout","time":"2018-08-12T12:46:31.899581022Z"}
{"log":" * Debug mode: off\r\n","stream":"stdout","time":"2018-08-12T12:46:31.899605233Z"}
{"log":" * Running on http://0.0.0.0:5000/ (Press CTRL+C to quit)\r\n","stream":"stdout","time":"2018-08-12T12:46:31.909541576Z"}

※기사를 만들기 위해서 tail했으므로, 에러는 나오지 않는다.

여러가지 해, 문제는 아무것도 해소하고 있지 않지만,
아무것도 남지 않는 것이 힘들기 때문에 여기에 기록을 남깁니다.
누군가의 도움이 되었으면 좋겠습니다.