Docker Container goes unhealthy

Hi

I’m running an oracle database in an docker container.
The database get’s up fine and is running.
Whoever after some time, the container is marked as “(unhealthy)”.

After starting the database, I run an tail -f on the alertlog.
Otherwise the container would shut down, wouldn’t it?

The Dockerfile ends like this:

USER oracle
EXPOSE 1521 5500

HEALTHCHECK --interval=5m --start-period=10m
CMD /home/oracle/scripts/healthcheck.sh >/dev/null || exit 1

CMD exec /home/oracle/scripts/startup.sh

The “startup Script”
export ORACLE_SID=mydb
export ORACLE_BASE=/opt/oracle
export ORACLE_HOME=/opt/oracle/product/18c/dbhomeXE/
export PATH=$PATH:$HOME/.local/bin:$HOME/bin:$ORACLE_HOME/bin

echo “******************************************************************************”
echo “Handle shutdowns.” date
echo “docker stop --time=30 {container}” date
echo “******************************************************************************”

function gracefulshutdown {
dbshut $ORACLE_HOME
}

trap gracefulshutdown SIGINT
trap gracefulshutdown SIGTERM
trap gracefulshutdown SIGKILL

dbstart $ORACLE_HOME

ORACLE_SID=mydb
ORAENV_ASK=NO
. oraenv
cd
cd scripts
sqlplus / as sysdba @start_services.sql
tail -f {ORACLE_BASE}/diag/rdbms/{ORACLE_SID}/{ORACLE_SID}/trace/alert_{ORACLE_SID}.log &

bgPID=$!
wait $bgPID

Thx
Christian