[FIX]Overlayfs problem with cron (again)

backups/rsyncvolumes/Dockerfile

@@ -7,9 +7,6 @@ ENV DEST /var/backups/
 RUN apt-get update && apt-get install --no-install-recommends -y \
       cron gettext-base rsync python-minimal libpython-stdlib
 
-# Avoid overlayfs bug with tail
-VOLUME /var/log
-
 COPY crontab /etc/crontab
 RUN chmod 644 /etc/crontab
 

backups/rsyncvolumes/crontab

@@ -1,6 +1,5 @@
 # hourly backup
 # m h dom mon dow user	command
-15 *	* * *	root	/bin/bash /opt/backup/rsync.sh >> /var/log/cron.log 2>&1
-0 3	* * *	root	/usr/bin/python /opt/backup/plan.py >> /var/log/cron.log 2>&1
+15 *	* * *	root	/bin/bash /opt/backup/rsync.sh > /proc/1/fd/1 2>/proc/1/fd/2
+0 3	* * *	root	/usr/bin/python /opt/backup/plan.py > /proc/1/fd/1 2>/proc/1/fd/2
 # empty line needed
-

backups/rsyncvolumes/launch.sh

@@ -2,4 +2,4 @@
 
 envsubst < /opt/backup/rsync.template > /opt/backup/rsync.sh
 envsubst < /opt/backup/plan.tpl.py > /opt/backup/plan.py
-touch /var/log/cron.log && cron && tail -f /var/log/cron.log
+cron -f

odoo/backups/Dockerfile

@@ -10,9 +10,6 @@ USER root
 RUN mkdir backups
 RUN apt-get install -y --no-install-recommends cron gettext-base
 
-# Avoid overlayfs bug with tail
-VOLUME /var/log
-
 COPY crontab /etc/crontab
 RUN chmod 644 /etc/crontab
 

odoo/backups/crontab

@@ -1,6 +1,5 @@
 # daily odoo backup
 # m h dom mon dow user	command
-0 2	* * *	odoo	/bin/bash /home/odoo/backup.sh >> /var/log/cron.log 2>&1
-10 2	* * *	odoo	/usr/bin/python /home/odoo/plan.py >> /var/log/cron.log 2>&1
+0 2	* * *	odoo	/bin/bash /home/odoo/backup.sh > /proc/1/fd/1 2>/proc/1/fd/2
+10 2	* * *	odoo	/usr/bin/python /home/odoo/plan.py /proc/1/fd/1 2>/proc/1/fd/2
 # empty line required at the end of this file for a valid cron file.
-

odoo/backups/launch.sh

@@ -2,4 +2,4 @@
 
 envsubst < /home/odoo/backup.template > /home/odoo/backup.sh
 chown odoo:odoo /home/odoo/backup.sh
-touch /var/log/cron.log && cron && tail -f /var/log/cron.log
+cron -f