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Docker is an open-source container virtualization application mainly written in Go (like PhotoPrism). It is ideal for running applications on any computer without extensive installation, configuration or performance overhead. All you need to do is download an image and start it. However, Docker is not commonly used by end users and more popular among developers / admins. For that reason, PhotoPrism must also be usable without running in a container, at least on Linux and OS X.

Continuous Integration / Deployment

Build and push of an updated container image to Docker Hub is automatically performed by Travis CI whenever develop is merged into master and the tests are all green. For that reason, we don't use semantic versioning for our binaries and container images. A version string might look like 181112-edc7c2f-Darwin-i386-DEBUG instead. Travis CI uses the photoprism/development image for running unit and integration tests on all branches and for pull requests, see Dockerfile.

Multi-Stage Build

When creating new images, Docker supports so called multi-stage builds, that means you can compile an application like PhotoPrism in a container that contains all development dependencies (like source code, debugger, compiler,...) and later copy the binary to a fresh container. This way we could reduce the compressed container size from ~1 GB to less than 200 MB. Most of that is used by Darktable, TensorFlow and Ubuntu 18.04. Our photoprism binary is smaller than 20 MB.


FROM photoprism/development:20181112 as build

# Build PhotoPrism
WORKDIR "/go/src/"
COPY . .
RUN make all install

# Base base image as photoprism/development
FROM ubuntu:18.04

WORKDIR /srv/photoprism

# Copy built binaries and assets to this image
COPY --from=build /usr/local/bin/photoprism /usr/local/bin/photoprism
COPY --from=build /srv/photoprism /srv/photoprism

# Expose HTTP port

# Start PhotoPrism server
CMD photoprism start