docker log 확인

1. 도커 컨테이너 로그를 확인하기 전에 컨테이너 목록을 확인합니다.

$ docker ps -a
CONTAINER ID        IMAGE                           COMMAND                  CREATED             STATUS                        PORTS                    NAMES
9ee69b720f7a        hello-world                     "/hello"                 26 minutes ago      Exited (0) 26 minutes ago                              stupefied_mahavira
f5ee9e7b31a4        teamlab/pydata-tensorflow:0.1   "/opt/start"             3 hours ago         Created                                                quirky_jones
23b119d646f9        teamlab/pydata-tensorflow:0.1   "/opt/start"             3 hours ago         Exited (137) 23 minutes ago                            fervent_fermi
c8114d22183d        mysql:5.7                       "docker-entrypoint..."   4 hours ago         Up 4 hours                    0.0.0.0:3306->3306/tcp   mysql
 

2. 아래와 같이 "docker logs [container id]" 명령어를 실행합니다.

$ docker logs 23b
Installed kernelspec python3 in /usr/local/share/jupyter/kernels/python3
[I 02:17:30.472 NotebookApp] Writing notebook server cookie secret to /root/.local/share/jupyter/runtime/notebook_cookie_secret
[I 02:17:30.581 NotebookApp] Serving notebooks from local directory: /notebooks
[I 02:17:30.581 NotebookApp] 0 active kernels
[I 02:17:30.581 NotebookApp] The Jupyter Notebook is running at: http://0.0.0.0:8888/
[I 02:17:30.581 NotebookApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
WARNING:tensorflow:IOError [Errno 2] No such file or directory: '/opt/conda/envs/ml_python34/lib/python3.4/site-packages/tensorflow/tensorboard/TAG' on path /opt/conda/envs/ml_python34/lib/python3.4/site-packages/tensorflow/tensorboard/TAG
WARNING:tensorflow:Unable to read TensorBoard tag
[I 02:22:32.579 NotebookApp] 302 GET / (172.17.0.1) 1.42ms
[I 03:22:22.845 NotebookApp] 302 GET / (192.168.30.1) 2.61ms
[I 03:23:30.441 NotebookApp] Creating new notebook in
[I 03:23:30.493 NotebookApp] Writing notebook-signing key to /root/.local/share/jupyter/notebook_secret
[I 03:23:31.173 NotebookApp] Kernel started: c28ac959-9718-4017-ae0c-c47dc7a9fe07
[I 03:27:06.448 NotebookApp] Saving file at /Untitled.ipynb
[I 04:35:06.273 NotebookApp] Saving file at /Untitled.ipynb
[I 04:36:51.835 NotebookApp] 302 GET / (172.17.0.1) 1.54ms
[I 04:36:51.866 NotebookApp] Saving file at /Untitled.ipynb
[I 04:36:59.599 NotebookApp] Kernel shutdown: c28ac959-9718-4017-ae0c-c47dc7a9fe07
[W 04:36:59.603 NotebookApp] delete /Untitled.ipynb
[I 04:38:26.615 NotebookApp] Creating new notebook in
[I 04:38:27.467 NotebookApp] Kernel started: 6c3891ba-e08f-4101-9975-437f6c452b58
[I 04:40:27.407 NotebookApp] Saving file at /Untitled.ipynb
[I 04:42:27.403 NotebookApp] Saving file at /Untitled.ipynb
 

* 로그를 확인해보니 에러도 있고 경고도 있고 합니다.

* 트러블 슈팅을 진행하는 데 있어서 로그를 확인하는 습관은 매우 중요하므로 자주 확인하는 것이 좋습니다.