To ensure the maximum level of success possible, I would strongly advise you to compile and run both Keter and your Yesod application on the same platform. The recommendation is also to compile your application on a different machine from the one you're deploying on, since GHC compilation is very resource intensive. It looks like you're already doing this (albeit compiling on OS X and deploying on an Ubuntu server, which is not going to work, as described in response to your own answer).
My recommendation would be to use Docker containers to ensure consistent environments. I have a GitHub project containing a number of Dockerfiles I've been working on to address this and I'll describe roughly what they do here. Note that this GitHub project is still a work in progress and I don't have everything absolutely perfect yet. This is also similar to the answer I gave to this question.
keter-build:
FROM haskell:latest
RUN apt-get update && apt-get install -y \
git
RUN mkdir /src
RUN cd src && \
git clone https://github.com/snoyberg/keter && \
cd keter && \
git checkout e8b5a3fd5e14dfca466f8acff2a02f0415fceeb0
WORKDIR /src/keter
RUN cabal update
RUN cabal install keter
This configures a container that can be used to build the keter binary at a given revision from the Keter GitHub project.
keter-host:
FROM debian
RUN apt-get update && apt-get install -y \
ca-certificates \
libgmp-dev \
nano \
postgresql
COPY artifacts/keter /opt/keter/bin/
COPY artifacts/keter-config.yaml /opt/keter/etc/
EXPOSE 80
CMD ["/opt/keter/bin/keter", "/opt/keter/etc/keter-config.yaml"]
This container is a self-contained Keter host. You should ensure that the keter binary built in the keter-build container is available in the artifacts directory so that the COPY artifacts/keter /opt/keter/bin/ instruction copies it into the image.
yesod-env:
FROM haskell:latest
RUN apt-get update && apt-get install -y \
ca-certificates \
git \
nano \
wget
RUN echo 'deb http://download.fpcomplete.com/debian/jessie stable main' > /etc/apt/sources.list.d/fpco.list
RUN wget -q -O- https://s3.amazonaws.com/download.fpcomplete.com/debian/fpco.key | apt-key add -
RUN apt-get update && apt-get install -y \
stack
This is a container for building the Yesod app. Note that this Dockerfile is incomplete and haven't got it to clone the app's source code and build it yet. However, this might get you started.
Note that all three containers are ultimately based off the same debian Docker base image, so that binaries produced in each container will have a good chance of being valid in other containers. Some of my work was inspired by Dockerfiles designed by thoughtbot.
