Add Java/jre/jvm In Python Flask Cloud Foundry/ibm Cloud Application
Solution 1:
After much trial and error, the solution that worked for me was a multi build pack deployment as described below:
cf push -b https://github.com/cloudfoundry/multi-buildpack
and in the root of your project include a multi-buildpack.yml
with the following
buildpacks:
- https://github.com/cloudfoundry/apt-buildpack
- https://github.com/cloudfoundry/python-buildpack
and an apt.yml
with the following:
--- packages:openjdk-8-jrerepos:debhttp://ppa.launchpad.net/openjdk-r/ppa/ubuntutrustymainkeys:https://keyserver.ubuntu.com/pks/lookup?op=get&search=0xEB9B1D8886F44E2A
In the runtime.txt
file, (also in the root of the project) is the version of python
python-3.6.6
Unfortunately, JAVA gets installed in your home deps
directory and as such you'll have to create a JAVA_HOME
environment variable in the manifest.yml
.
JAVA_HOME: /home/vcap/deps/0/apt/usr/lib/jvm/java-8-openjdk-amd64/jre/
I also tried to add jre/bin to the path this way
PATH: /bin:/usr/bin:/home/vcap/deps/0/apt/usr/lib/jvm/java-8-openjdk-amd64/jre/bin
However the push wipes this out and installs only the default path /bin;/usr/bin
fortunately for me, JAVA_HOME
was enough to get jaydebapi
to work with the database driver for the jar
files I had. If you need this environment variable,
maybe try using the python
os package to issue a command to modify the path as part of the startup.
Solution 2:
To include a more modern answer. As I write this, most (all worth using) versions of Cloud Foundry you encounter will support multiple buildpacks out-of-the-box. Thus you don't need the multi-buildpack buildpack anymore.
Instead, you can simply cf push
and specify multiple buildpacks.
https://docs.cloudfoundry.org/buildpacks/use-multiple-buildpacks.html
This can either be done by setting multiple -b
flags to cf push
or by using a manifest.yml
file and doing something like this:
...
buildpacks:
- buildpack_1
- buildpack_2
...
In either case, the execute in the order you list them.
https://docs.cloudfoundry.org/devguide/deploy-apps/manifest-attributes.html#buildpack
The rest of the answer remains the same as @lamonaki's answer.
Invoke both the apt-buildpack and the Python buildpack, in that order.
Add the
apt.yml
file and in it, indicate the Java package you'd like to install.Ex from @lamonaki's answer:
--- packages:openjdk-8-jrerepos:debhttp://ppa.launchpad.net/openjdk-r/ppa/ubuntutrustymainkeys:https://keyserver.ubuntu.com/pks/lookup?op=get&search=0xEB9B1D8886F44E2A
Add
runtime.txt
to set the Python version you'd like to installAdd a
.profile
file to the root of the project, just likeapt.yml
andruntime.txt
. In that, add lines forexport JAVA_HOME=/home/vcap/deps/0/apt/usr/lib/jvm/java-8-openjdk-amd64/jre/
andexport PATH=$PATH:$JAVA_HOME/bin
and potentiallyLD_LIBRARY_PATH
if you need to reference any custom shared libraries in your Java or Python code.
You might be thinking, why apt-buildpack instead of the Java buildpack. Unfortunately, the Java buildpack in its current incarnation only supports running as a final buildpack (i.e. the last buildpack in the list of buildpacks). That rules it out as a good candidate here since you want the Python buildpack to be last. The Java Cloud Native Buildpacks will resolve the issue, but as I write this, there are no Cloud Native Buildpacks which run natively on CF.
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