Better log output

Dockerfile

@@ -1,9 +1,22 @@
-FROM python:3.12-alpine
+FROM python:3.12-slim
+
+# Update apt-get package list, grab pre-requisites 'cron' & 'vim'
+RUN apt-get update && apt-get -y install cron vim
+
+# Set the working directory for following commands in this docker container to '/app'
 WORKDIR /app
+
 COPY crontab /etc/cron.d/crontab
-COPY extract.py /app/extract.py
+COPY extract.py ./extract.py
+
+# Make the crontab executable
 RUN chmod 0644 /etc/cron.d/crontab
-RUN /usr/bin/crontab /etc/cron.d/crontab
 
-# run crond as main process of container
-CMD ["/usr/sbin/crond", "-f", "-d", "0"]
+# Set the cron job
+RUN crontab /etc/cron.d/crontab
+
+# Create empty log (TAIL needs this)
+RUN touch /tmp/out.log
+
+# Run cron and tail the log
+CMD cron && tail -f /tmp/out.log

crontab

@@ -1,3 +1,3 @@
 # START CRON JOB
-* * * * * python3 /app/extract.py
+*/5 * * * * /usr/local/bin/python /app/extract.py >>/tmp/out.log 2>&1
 # END CRON JOB

extract.py

@@ -14,3 +14,5 @@
 
 with open("/output/certs/key.pem", "w") as key_file:
     key_file.write(key)
+
+print("Cert extracted successfully.")