Systemd not working inside the docker container customise base image

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Hello,

I have built a docker image. There I am using the yocto built rootfs. The systemd is already integrated with that rootfs. but when I login into the container using "docker exec -it mycontainer_name sh " and I am trying to start an application through systemctl command i.e. “systemctl start app_name.service”. But I am getting below error:

System has not been booted with systemd as init system (PID 1). Can’t operate.

My Docker file looks like this:

FROM scratch  
ADD My_dev_env.rootfs.tar.bz2 /

#copy the executables required inside the docker image
COPY some_test.sh /usr/bin/  

#set the work directory for image
WORKDIR /usr/bin

RUN chmod 777 /usr/bin/some_test.sh 

#Tell image what to do on runnig as a container
 CMD ["./some_test.sh "]

And I am running this docker container as systemd service on my host my docker_service file is as below:

[Unit]
Description=run_rungdptest Container
After=docker.service
Requires=docker.service

[Service]
Type=simple
User=root
TimeoutStartSec=0
ExecStartPre=-/usr/bin/docker rm docker_container_name
ExecStart=/usr/bin/docker run \
	--name docker_container_name \
    docker_image_name
ExecStop=/usr/bin/docker stop docker_container_name
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target

But, even the systemd is already integrated in the rootfs that I am using here. Eventhen systemd is not working inside the docker container. Can anybody suggest me on this, how can I make systemd working please. Any suggestion will help me a lot.

Regards,
Siddhartha V