将 Docker 日志尾部的最后一行存储到 shell 变量

Question

我要做的就是将docker log 的最后一行捕获到shell 脚本中的一个变量中。

这是我的设置：

Dockerfile：

FROM python:3.7.2
WORKDIR /workspace
RUN pip install jupyterlab
EXPOSE 8888
ENTRYPOINT ["jupyter", "lab", "--ip=0.0.0.0", "--allow-root", "--no-browser"]

run.sh：

#!/bin/sh

docker build -t ml/jupyterlab .
docker rm -f ml-jupyterlab
docker run -d -p 8888:8888 -v $(pwd)/src:/workspace --name ml-jupyterlab ml/jupyterlab

until [[ "$url_info" =~ "token" ]]; do
    url_info=$(docker logs ml-jupyterlab --tail 1)
    sleep 0.1 
done

echo "$url_info"

---

如果有帮助，这里是来自 Docker 容器的登录信息，我正在尝试捕获 $url_info 中的最后一行 http://(6f8bec0aa3d9 or 127.0.0.1):8888/?token=a6001a419b22d60dd3e5215d52794c5be7c0b368664c3505

[I 05:22:37.925 LabApp] Writing notebook server cookie secret to /root/.local/share/jupyter/runtime/notebook_cookie_secret
[I 05:22:39.190 LabApp] JupyterLab extension loaded from /usr/local/lib/python3.7/site-packages/jupyterlab
[I 05:22:39.190 LabApp] JupyterLab application directory is /usr/local/share/jupyter/lab
[W 05:22:39.194 LabApp] JupyterLab server extension not enabled, manually loading...
[I 05:22:39.198 LabApp] JupyterLab extension loaded from /usr/local/lib/python3.7/site-packages/jupyterlab
[I 05:22:39.198 LabApp] JupyterLab application directory is /usr/local/share/jupyter/lab
[I 05:22:39.199 LabApp] Serving notebooks from local directory: /workspace
[I 05:22:39.199 LabApp] The Jupyter Notebook is running at:
[I 05:22:39.200 LabApp] http://(6f8bec0aa3d9 or 127.0.0.1):8888/?token=a6001a419b22d60dd3e5215d52794c5be7c0b368664c3505
[I 05:22:39.200 LabApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
[C 05:22:39.204 LabApp]

    To access the notebook, open this file in a browser:
        file:///root/.local/share/jupyter/runtime/nbserver-1-open.html
    Or copy and paste one of these URLs:
        http://(6f8bec0aa3d9 or 127.0.0.1):8888/?token=a6001a419b22d60dd3e5215d52794c5be7c0b368664c3505

---

执行以下操作

$ chmod +x run.sh
$ ./run.sh

进入无限循环，$url_info 仍然是null

Answer 1

最后，我使用以下脚本解决了这个问题：

#!/bin/sh

docker build -t ml/jupyterlab .
docker rm -f ml-jupyterlab
docker run -d -p 8888:8888 -v $(pwd)/src:/workspace --name ml-jupyterlab ml/jupyterlab

until [[ "${url_info}" != "" ]]; do
    docker logs ml-jupyterlab &> logs
    url_info=$(cat logs | grep token | head -1)
    sleep 0.1 
done


echo "$url_info"

Answer 2

有可能在暂停的 0.1 秒内产生多个个日志文件，包括一个带有“token”的日志文件。

这意味着最新的行可能不包含令牌（它已经在日志中，在前面的行中）

用

替换你的测试

until [[ "${url_info}" != "" ]]; do
    url_info=$(docker logs ml-jupyterlab --tail 100|grep token)
    sleep 0.1 
done

只要url_info 为空，继续测试。