crontab on Dockerfile

centos68_cron_only.md

• Dockerfile

  FROM centos:centos6.8
  
  ENV http_proxy http://proxy.daumkakao.io:3128
  ENV https_proxy http://proxy.daumkakao.io:3128
  
  #Install Cron
  RUN yum clean all && yum install epel-release -y && yum install cronie -y
  
  ENV http_proxy ''
  ENV https_proxy ''
  
  # 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
  
  # Create the log file to be able to run tail
  RUN touch /var/log/cron.log
  
  # Run the command on container startup
  CMD crond && tail -f /var/log/cron.log
  

• execution

  $ sudo docker build -t testcron:testcron .
  $ sudo docker run -v /etc/localtime:/etc/localtime:ro testcron:testcron
  

• ref

  • https://github.com/Ekito/docker-cron/blob/master/Dockerfile

devcron.md

• Dockerfile

  RUN yum install ... python-pip python-devel -y 
  ...
  RUN pip install --upgrade pip
  RUN pip install -e hg+https://bitbucket.org/dbenamy/devcron#egg=devcron
  RUN mkdir /cron
  ADD cron.speller /cron/crontab
  ADD test.sh /tmp/test.sh
  VOLUME ["/cron"]
  CMD ["devcron.py", "/cron/crontab"]
  ...
  

• ref

  • http://stackoverflow.com/questions/31644391/docker-centos-7-cron-not-working-in-local-machine
  • https://hub.docker.com/r/hamiltont/docker-cron/~/dockerfile/
  • https://github.com/lysender/docker-cron-php-gearman/blob/master/Dockerfile

normal_cron.md

• Dockerfile

  RUN yum install ... cronie -y 
  ...
  ADD crond /etc/pam.d/crond
  ADD cron.speller /etc/cron.d/cron.speller
  ADD test.sh /tmp/test.sh
  RUN chmod 0644 /etc/cron.d/cron.speller
  RUN touch /var/log/cron.speller.log
  RUN touch /var/log/cron.test.log
  RUN crontab /etc/cron.d/cron.speller
  CMD cron
  ...
  

• ref

  • http://www.unix.com/unix-for-dummies-questions-and-answers/105785-build-crontab-text-file.html
  • https://tecadmin.net/install-crontab-in-linux/
  • https://github.com/aptible/docker-cron-example

pam_d_modified.md

• /etc/pam.d/crond 수정 후 cron 등록

• Dockerfile

  RUN yum install ... cronie -y 
  ...
  ADD crond /etc/pam.d/crond
  ADD cron.speller /tmp/cron.speller
  CMD ["/bin/bash", "start.sh"]
  ...
  

• ref

  • https://kakao.agit.in/search?group_name=Docker+SIG&q=cron&sec=300001082
  • CentOS/CentOS-Dockerfiles#31

ubuntu_cron_only.md

• Dockerfile

  FROM ubuntu:latest
  
  ENV http_proxy http://proxy.daumkakao.io:3128
  ENV https_proxy http://proxy.daumkakao.io:3128
  
  #Install Cron
  RUN apt-get update
  RUN apt-get -y install cron
  
  ENV http_proxy ''
  ENV https_proxy ''
  
  # 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
  
  # 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
  

• execution

  $ sudo docker build -t testcron:testcron .
  $ sudo docker run -v /etc/localtime:/etc/localtime:ro testcron:testcron
  

• ref

  • https://github.com/Ekito/docker-cron/blob/master/Dockerfile