baikal-docker in subdir behind traefik - solved

[uelpenichsa]

Hi there,

I'm not sure if this belongs here, but I was struggling a lot to run the dockerized version of baikal in a subdir behind traefik, e.g. https://example.com/baikal/. I did a lot of duckduckgoing (and also googling) but found only solutions that seemed weird and/or often only worked for some people or I found users that had problems setting up my scenario successfully, too.

Thus, I want to share my approach here, that currently works flawlessly in a setup with an SSL server certificate and self-signed client certificates from my own CA.

I use the apache-based baikal image and use it as a basis to build a derived image. During docker build an "alias.conf" file is copied into the image, that contains only on line:

Alias "/baikal" "/var/www/baikal/html/"

Then the docker build process executes the a2enconf binary that enables the alias.conf file for apache. The baikal.Dockerfile has the following content:

FROM ckulka/baikal:latest
COPY alias.conf /etc/apache2/conf-available/
RUN /usr/sbin/a2enconf alias

The respective baikal labels in Traefik have to define the PathPrefix-Rule "/baikal" and the baikal service in the Dockerfile needs the build directives (baikal and the Dockerfile "baikal.Dockerfile" are in a subdir "/baikal" and not in the directory where docker-compose.yml is stored):

build:
  context: ./baikal 
  dockerfile: baikal.Dockerfile
labels:
  - "traefik.enable=true"
  - "traefik.http.routers.baikal.rule=(Host(`example.com`) && PathPrefix(`/baikal`))"

...

In addition, you have to change the request_uri parameter in baikal-confdir/baikal.yaml to
base_uri: '/baikal/'

This doesn't seem to be necessary for accessing https://example.com/baikal/ and /baikal/admin/ but for accessing https://example.com/baikal/dav.php it is required. Without this setting dav.php is searched in the root dir of the web server and not in /baikal.

That's it.

As of now I have not experienced any problems oder flaws with this approach.

Best regards
Sascha