CMD does not run if used after ENTRYPOINT

I have the following docker file

FROM confluentinc/cp-kafka-connect:5.3.1

RUN apt-get update && apt-get -y install cron

ENV CONNECT_PLUGIN_PATH=/usr/share/java

# JDBC-MariaDB
RUN wget -nv -P /usr/share/java/kafka-connect-jdbc/ https://downloads.mariadb.com/Connectors/java/connector-java-2.4.4/mariadb-java-client-2.4.4.jar

# SNMP Source
RUN wget -nv -P /tmp/ https://github.com/name/kafka-connect-snmp/releases/download/0.0.1.11/kafka-connect-snmp-0.0.1.11.tar.gz
RUN mkdir /tmp/kafka-connect-snmp && tar -xf /tmp/kafka-connect-snmp-0.0.1.11.tar.gz -C /tmp/kafka-connect-snmp/
RUN mv /tmp/kafka-connect-snmp/usr/share/kafka-connect/kafka-connect-snmp /usr/share/java/

COPY plugins-config.sh /usr/share/kafka-connect-script/plugins-config.sh
RUN chmod +x /usr/share/kafka-connect-script/plugins-config.sh

ENTRYPOINT [ "./etc/confluent/docker/run" ]

CMD ["/usr/share/kafka-connect-script/plugins-config.sh"]

And the bash file as this

#!/bin/bash

#script to configure kafka connect with plugins
# export CONNECT_REST_ADVERTISED_HOST_NAME=localhost
# export CONNECT_REST_PORT=8083
url=http://$CONNECT_REST_ADVERTISED_HOST_NAME:$CONNECT_REST_PORT/connectors
curl_command="curl -s -o /dev/null -w %{http_code} $url"
sleep_second=5
sleep_second_counter=0
max_seconds_to_wait=60

echo "Waiting for Kafka Connect to start listening on localhost" >> log.log
echo "HOST: $CONNECT_REST_ADVERTISED_HOST_NAME , PORT: $CONNECT_REST_PORT" >> log.log
while [[ $(eval $curl_command) -eq 000 && $sleep_second_counter -lt $max_seconds_to_wait ]]
 do 
    echo "In" >> log.log
    echo -e $date " Kafka Connect listener HTTP state: " $(eval $curl_command) " (waiting for 200) $sleep_second_counter" >> log.log
    echo "Going to sleep for $sleep_second seconds" >> log.log
    sleep $sleep_second 
    echo "Finished sleeping" >> log.log
    ((sleep_second_counter+=$sleep_second))
    echo "Finished counter" >> log.log
done
echo "Out" >> log.log
nc -vz $CONNECT_REST_ADVERTISED_HOST_NAME $CONNECT_REST_PORT

/bin/bash

Entry point gets called correctly but CMD does not get invoked.

I also try to understand the solution given here https://stackoverflow.com/questions/54447913/cmd-doesnt-run-after-entrypoint-in-dockerfile

but I did not understand the solution.

If someone could explain a bit more what is wrong here.

What I am trying to accomplish

I am trying to have a single docker container image which will start the kafka-connect server (ENTRYPOINT) and then via bash file (CMD) I will configure the plugins. Requirement is that the same sequence of steps gets executed everytime the containers restarts.

CMD is run after ENTRYPOINT, like parameters after a function invokation, in the same command line.

In your case you want two different commands running sequentially. Then, you may add them to a startup_script.sh whose content is:

#!/bin/bash

./etc/confluent/docker/run & # run in background not to get stuck in here

/usr/share/kafka-connect-script/plugins-config.sh # apply configuration

sleep 100000000 # to avoid the startup script to exit since that would kill the container