cron服务没有以docker container启动

我一直试图在Docker容器中运行cron作业,但在容器启动时似乎无法运行cron服务。我可以远程进入正在运行的容器并运行“cron”以使服务无问题地启动。我的dockerfile中包含了这个,为什么不执行命令?

我可以通过执行以下操作(如上所述)使其工作:

docker-compose build
docker-compose up -d
docker exec -it my_container /bin/bash
root@2348723ae34: /etc/init.d/cron status <--check cron service status
[FAIL] cron is not running ... failed!  <--- cron not running
root@2348723ae34: cron
[ ok ] cron is running. <-- simply running cron starts the service

crontab文件

*/2 * * * * rm -rf /usr/src/app/assets/aligned_output/* && rm -rf /usr/src/app/assets/aligned_input/*

停靠文件

FROM node:latest

RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app
COPY . /usr/src/app

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

RUN touch /etc/crontab /etc/cron.*/*

EXPOSE 80
RUN npm install
CMD ["npm", "start"]

docker-compose.yml文件

inventory:
   build: .
   restart: always
   command: npm start
   ports:
   - "80:80"
   environment:
      - NODE_ENV=production