Example how to run a simple Geant4 code with docker in condor.
In this repository there are:
- code to run a simulation using Geant4
- Dockerfile to build a docker image which includes all the dependencies to run the code (presently it doesn't include the code itself but it is easy to do it)
- script to run the code
- condor file to submit the job
Each time a commit is pushed to this repository a Docker image is automatically built on Docker hub: https://hub.docker.com/r/wiso/condordockergeant4example/
To run this example on condor just download this repository with git clone and run
condor_submit job.docker
When the job is executed on condor the Docker image specified by docker_image = wiso/condordockergeant4example is downloaded from the Docker hub and the a Docker container is started. Thanks to the option transfer_input_files=EMCalo the folder EMCalo is available in the sanbox folder, created by condor, inside the container, together with the executable executable = ./condor_calo_sim_wrapper.sh. The directory EMCalo contains the user code, while the image contains only the Geant4 framework (in principle one can also put the user code inside the image). Then the executable is run. It creates a directory to contain the build of the user code, moves to it, starts the compilation and finally run the produced executable. As specified in the condor file only one file, produced when running the executable, is transfered back to the local machine (EMCalo_build/run_samp_em_10GeV.root). Log, error and output file are saved. A minimum amount of memory is required.
The Docker image containing Geant4 is already built and pushed to the Docker hub, so this step is not needed. To do that one has just to run
docker build .
from the directory where Dockerfile is present (with the right permissions, for example as root). You can also add a flat -t to tag the build
You can push the image to a docker-hub. This image is pushed automatically to dockerhub.com each time a commit is pushed into this git repository. If you want you can do it manually.
If you haven't tag your image do that. Without rebuilding just do docker images and note down the IMAGE ID, then tag it. If you want to push to dockerhub.com (and you have an account there) tag it as myusername/tag, eventually myusername/tag:version. If you want to push to another server servename:port/tag.
Before pushing you need to login into the docker hub
docker login
eventually specify a server name as
docker login distribution.mi.infn.it:1443
and then push, for example
docker push distribution.mi.infn.it:1443/condordockergeant4example