docker cron 不工作

Question

我正在尝试构建一个包含 cron 的 docker 镜像。从 docker 文件系统的特定位置删除文件的 cron。下面是我的 Dockerfile

FROM ubuntu:latest
MAINTAINER docker@ekito.fr

RUN apt-get update && apt-get -y install cron

# Copy testfiles folder to docker container.
COPY ./testfiles /opt/

# Create the log file to be able to run tail
RUN touch /var/log/cron.log

RUN (crontab -l -u root; echo "* * * * * root rm -rf /opt/*") | crontab

# Run the command on container startup
CMD cron

ENTRYPOINT ["/bin/sh", "-c", "/bin/bash"]

一切都很成功。我的 cron 也设置在容器中

roadrunner:test shailesh$ docker run -it crontest /bin/bash
root@ac31f5acc49f:/# ls
bin  boot  dev  etc  home  lib  lib64  media  mnt  opt  proc  root  run  sbin  srv  sys  tmp  usr  var
root@ac31f5acc49f:/# crontab -l
* * * * * root rm -rf /opt/*
root@ac31f5acc49f:/# cd /opt/
root@ac31f5acc49f:/opt# ls  
file1  file10  file11  file12  file13  file14  file15  file16  file17  file18  file19  file2  file20  file21  file22  file23  file24  file25  file3  file4  file5  file6  file7  file8  file9

但是它没有运行并删除文件/opt/夹中的文件。有人能告诉我配置有什么问题吗？

Answer 1

尝试这样的事情，

FROM ubuntu:latest
MAINTAINER docker@ekito.fr

RUN apt-get update && apt-get -y install cron

# Add crontab file in the cron directory
ADD crontab /etc/cron.d/hello-cron

# Give execution rights on the cron job
RUN chmod 0644 /etc/cron.d/hello-cron

# Apply cron job
RUN crontab /etc/cron.d/hello-cron

# Create the log file to be able to run tail
RUN touch /var/log/cron.log

# Run the command on container startup
CMD cron && tail -f /var/log/cron.log

创建文件 crontab 并添加这样的条目

* * * * * root echo "Hello world" >> /var/log/cron.log 2>&1

希望能帮到你！！！