Add Docker

- Add Docker repository.
- Install docker-ce package.
- Add docker daemon start to post start script.

Dockerfile

@@ -189,6 +189,12 @@ RUN julia -e 'import Pkg; Pkg.update()' && \
 
 USER root
 
+# Install Docker
+RUN curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
+RUN add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
+RUN apt update
+RUN apt install -y docker-ce
+
 # move kernelspec out of home
 RUN mv $HOME/.local/share/jupyter/kernels/julia* $CONDA_DIR/share/jupyter/kernels/ && \
     chmod -R go+rx $CONDA_DIR/share/jupyter && \

poststart.sh

@@ -14,11 +14,16 @@ fi
 Rscript -e 'dir.create(path = Sys.getenv("R_LIBS_USER"), showWarnings = FALSE, recursive = TRUE)'
 Rscript -e '.libPaths( c( Sys.getenv("R_LIBS_USER"), .libPaths() ) )'
 
+# create matching folders to mount the farm
 sudo mkdir -p /nfs
 sudo mkdir -p /lustre
 sudo mkdir -p /warehouse
 
+# copy mount-farm so its avaiable on the user's path
 sudo chmod +x /mount-farm.sh
 sudo cp /mount-farm.sh /usr/local/bin/mount-farm
 
+# start docker service
+sudo service docker start
+
 export USER=jovyan