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--- public:docker [2017-02-09 12:41] – [Q&A] Jan David Mol
+++ public:docker [2018-02-05 10:31] – [Development (extending the software)] Jan David Mol
@@ Line 73: / Line 73: @@
 A: The LOFAR software is compiled for a 2015-era processor (Intel Xeon E5-2603v3 to be exact) for performance reasons, and uses CPU instructions not available on older machines. Please run our images on a newer machine.
+===== Development (extending the software) =====
+=== Q: How do I obtain your Dockerfiles? ===
+A: By running:
+<file>
+svn co -N https://svn.astron.nl/LOFAR/branches/LOFAR-Release-2_19/
+cd LOFAR-Release-2_19
+mkdir -p build/gnu_opt && cd build/gnu_opt
+cmake ../.. -DBUILD_PACKAGES=Docker -DUSE_LOG4CPLUS=OFF -DUSE_CASACORE=OFF && make -j 16 install
+</file>
+which will put the Dockerfiles in subdirectories in ''LOFAR-Release-2_19/build/gnu_opt/installed/share/docker''.
+=== Q: How do I build your Docker images from scratch? ===
+A: By obtaining the Dockerfiles (see above), and running:
+<file>
+# load LOFAR environment variables, used to determine tags etc
+source installed/lofarinit.sh
+# build all LOFAR images, in the order required by their interdependencies
+docker-build-all.sh
+</file>
+=== Q: How do I add files/modifications permanently? ===
+A: The best way to add stuff to our images is by creating a new image based on ours. To do so, create a directory containing the files you want to add. Add to this directory a ''Dockerfile'' that describes your extension, for example:
+<file>
+FROM lofar-pipeline:LOFAR-Release-2_19
+COPY my_extension /opt/my_extension
+</file>
+Finally, you run <file>docker build -t myimage:mytag directory/</file> where ''directory'' is the directory containing the Dockerfile, and ''myimage:mytag'' is the name and tag of your new image (instead of ''lofar-pipeline:LOFAR-Release-2_19''). See also the [[https://docs.docker.com/engine/reference/builder/|Docker manual]] on how to make and use Dockerfiles.
+=== Q: How do I add initialisation stuff? (PYTHONPATH, etc) ===
+A: Our Docker images execute ''/opt/bashrc'' upon entry, which in turn reads and sources all the files in ''/opt/bashrc.d/'' in order. You can thus add bash files to this directory that contain your initialisation statements, f.e. a file called ''20-myextension'' containing ''export PYTHONPATH=$PYTHONPATH:/opt/my_extension''.
+Note: if you add eggs to the image, you need to put the egg //filename// to the PYTHONPATH. It is not enough to add the directory containing the egg.