Jupyterlab docker container error on starting the container - python-3.x

Question

I have created a notebook Docker file as below to running the JupyterHub and JupyterLab
FROM ubuntu:16.04
RUN apt-get update
RUN apt-get install sudo
RUN sudo useradd -m admin
RUN sudo echo -e "admin\nadmin\n" | passwd admin
RUN sudo echo "admin ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers
USER admin
RUN sudo apt-get update && sudo apt-get install -y --no-install-recommends apt-utils
RUN sudo apt-get update \
&& sudo apt-get install -y build-essential \
&& sudo apt-get install -y libffi-dev \
&& sudo apt-get install -y libmysqlclient-dev \
&& sudo apt-get install -y libsasl2-dev \
&& sudo apt-get install -y openjdk-8-jdk \
&& sudo apt-get install -y openssh-server \
&& sudo apt-get install -y python-dev \
&& sudo apt-get install -y unzip \
&& sudo apt-get install -y wget \
&& sudo apt-get install -y mysql-client \
&& sudo apt-get install -y git
RUN sudo apt-get install -y libssl-dev libxml2-dev libxslt1-dev zlib1g-dev libkrb5-dev
RUN sudo apt-get update
RUN sudo apt-get install -y python3-pip
RUN sudo apt-get install -y python-pip
RUN sudo apt-get install -y python3-venv
RUN sudo python3 -m venv /opt/jupyterhub/
RUN sudo /opt/jupyterhub/bin/python3 -m pip install --upgrade pip
RUN sudo /opt/jupyterhub/bin/python3 -m pip install wheel
RUN sudo /opt/jupyterhub/bin/python3 -m pip install jupyterhub jupyterlab
RUN sudo /opt/jupyterhub/bin/python3 -m pip install ipywidgets
RUN sudo apt-get install -y curl
RUN sudo apt-get install -y nodejs npm
RUN sudo curl -sL https://deb.nodesource.com/setup_10.x -o nodesource_setup.sh
RUN sudo bash nodesource_setup.sh
RUN sudo apt-get install -y nodejs
RUN sudo npm install -g -y configurable-http-proxy
RUN sudo mkdir -p /opt/jupyterhub/etc/jupyterhub/
RUN cd /opt/jupyterhub/etc/jupyterhub/
RUN sudo /opt/jupyterhub/bin/jupyterhub --generate-config
RUN sudo mkdir -p /opt/jupyterhub/etc/systemd
RUN sudo chown -R admin:admin /opt/jupyterhub
RUN sudo echo "c.Spawner.default_url = '/lab' " >> /opt/jupyterhub/etc/jupyterhub/jupyterhub_config.py
RUN sudo echo "c.Authenticator.admin_users = {'admin'} " >> /opt/jupyterhub/etc/jupyterhub/jupyterhub_config.py
RUN sudo echo "c.LocalAuthenticator.create_system_users=True" >> /opt/jupyterhub/etc/jupyterhub/jupyterhub_config.py
RUN sudo echo -e '[Unit]\nDescription=JupyterHub\nAfter=syslog.target network.target\n\n[Service]\nUser=root\nEnvironment="PATH=/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/opt/jupyterhub/bin"\nExecStart=/opt/jupyterhub/bin/jupyterhub -f /opt/jupyterhub/etc/jupyterhub/jupyterhub_config.py\n\n[Install]\nWantedBy=multi-user.target' >> /opt/jupyterhub/etc/systemd/jupyterhub.service
RUN sudo cp /opt/jupyterhub/etc/systemd/jupyterhub.service /etc/systemd/system/jupyterhub.service
RUN sudo systemctl enable jupyterhub.service
#RUN sudo chown -R admin:admin /home/admin/.cache/pip
RUN sudo /opt/jupyterhub/bin/python3 -m pip install --upgrade setuptools
RUN sudo /opt/jupyterhub/bin/python3 -m pip install ipython==3.2.3
RUN sudo /opt/jupyterhub/bin/python3 -m pip install zipp==1.2.0
RUN sudo /opt/jupyterhub/bin/python3 -m pip install git+https://github.com/as-sher/sparkmagic.git#subdirectory=sparkmagic
RUN sudo /opt/jupyterhub/bin/jupyter-kernelspec install /opt/jupyterhub/lib/python3.5/site-packages/sparkmagic/kernels/sparkkernel
RUN sudo /opt/jupyterhub/bin/jupyter-kernelspec install /opt/jupyterhub/lib/python3.5/site-packages/sparkmagic/kernels/pysparkkernel
RUN sudo sed -i 's|root:x:0:0:root:/root:/bin/bash|root:x:0:0:root:/root:/sbin/nolgin|g' /etc/passwd
WORKDIR /home/admin
#USER root
EXPOSE 8000 2222
CMD SUDO SYSTEMCTL START JUPYTERHUB.SERVICE
When I am running this container as a root user, it is working, but when I am running this with admin (sudo user), I am getting the following error
Failed to mount tmpfs at /run/lock: Operation not permitted
[!!!!!!] Failed to mount API filesystems, freezing.
Freezing execution.
So my concern is that I have to run this container on Kubernetes and I don't want to run it as a root user and with privileged flag.
Is there any way in which I can run the existing docker with non-root user or if we can run the jupyter service without adding systemd.

Answer 1

There are some ways you can try in order to run Docker as a non-root user.
Manage Docker as a non-root user:
If you don’t want to preface the docker command with sudo, create a
Unix group called docker and add users to it. When the Docker daemon
starts, it creates a Unix socket accessible by members of the docker
group.
Create a docker group if there isn’t one:
$ sudo groupadd docker
Add your user to the docker group:
$ sudo usermod -aG docker [non-root user]
Log out and log back in so that your group membership is re-evaluated.
Run the Docker daemon as a non-root user (Rootless mode):
Rootless mode allows running the Docker daemon and containers as a
non-root user to mitigate potential vulnerabilities in the daemon and
the container runtime. Rootless mode does not require root privileges
even during the installation of the Docker daemon, as long as the
prerequisites are met.
Notice however that the second option is currently available as an experimental feature. You can find all the necessary details in the linked docs.
Please let me know if that helped.