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Hi, I am Vladimir Smagin, SysAdmin and

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Cron inside your Docker image with python app

№ 9577 В разделе Sysadmin от November 25th, 2018,
В подшивках: Cron, Docker

At first, create your cron file with usual crontab lines and name it mycrontab_lines

*/5 * * * * /app/cron_script.sh

Now create your cron_script.sh

#!/bin/bash
# load env variables
source /etc/profile
. ~/.profile

python3 /app/mycronapp.py

Ok, you ready now to create Dockerfile like this:

FROM python:3

# install cron service
RUN    apt-get ${APT_FLAGS_COMMON} update && \
    apt-get ${APT_FLAGS_PERSISTENT} -y install cron && \
    apt-get ${APT_FLAGS_COMMON} autoremove && \
    apt-get ${APT_FLAGS_COMMON} clean && \
    rm -rf /var/lib/apt/lists/*

# bla bla bla copy app.py
WORKDIR /app

COPY requirements.txt ./
RUN pip install --no-cache-dir -r requirements.txt

# install python app
COPY app.py .
COPY mycronapp.py .

# make cron
COPY mycrontab_lines .
COPY cron_script.sh .
RUN chmod 0755 run_previewer.sh
RUN chmod 0644 mycrontab_lines
RUN crontab mycrontab_lines

# start cron service before start blocking application
CMD service cron start && \
    python ./app.py

Build and run container.

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