Configure reverse-proxy for Keycloak docker with custom base URL

Question

How can I set the docker keycloak base url as parameter ?

I have the following nginx reverse proxy configuration:

server {     listen 80;     server_name example.com;      location /keycloak {         proxy_pass http://example.com:8087/;     } } 

When I try to access http://example.com/keycloak/ I got a keycloak http redirect to http://example.com/auth/ instead of http://example.com/keycloak/auth/

Any ideas?

Answer 1

Just tested that @home, and actually multiple configuration additions are needed:

1/ Run the keycloak container with env -e PROXY_ADDRESS_FORWARDING=true as explained in the docs, this is required in a proxy way of accessing to keycloak:

docker run -it --rm -p 8087:8080 --name keycloak -e PROXY_ADDRESS_FORWARDING=true jboss/keycloak:latest 

Also explained in this SO question

2/ Change the web-context inside keycloak's configuration file $JBOSS_HOME/standalone/configuration/standalone.xml

Default keycloak configuration points to auth

<web-context>auth</web-context> 

Then you could change it to keycloak/auth

<web-context>keycloak/auth</web-context> 

If you need to automate this for docker, just create a new keycloak image :

FROM jboss/keycloak:latest  USER jboss  RUN sed -i -e 's/<web-context>auth<\/web-context>/<web-context>keycloak\/auth<\/web-context>/' $JBOSS_HOME/standalone/configuration/standalone.xml 

3/ Add some proxy information to nginx configuration (mostly for http / https handling)

location /keycloak {     proxy_pass http://example.com:8087;     proxy_set_header Host $host;     proxy_set_header X-Real-IP $remote_addr;     proxy_set_header X-Forwarded-Proto $scheme;     proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } 

If you are proxying requests from nginx to keycloak on same server, I recommend using proxy_pass http://localhost:8087;, and if not try to use a private network to avoid proxying through external web requests.

Hope this helps

Answer 2

The redirect from /keycloak to /keycloak/auth isn't working. The redirect route in index.html and Base-URL is missing the /keycloak part. I had to add this:

FROM jboss/keycloak:latest  USER jboss  RUN sed -i -e 's/<web-context>auth<\/web-context>/<web-context>keycloak\/auth<\/web-context>/' $JBOSS_HOME/standalone/configuration/standalone.xml RUN sed -i -e 's/<web-context>auth<\/web-context>/<web-context>keycloak\/auth<\/web-context>/' $JBOSS_HOME/standalone/configuration/standalone-ha.xml RUN sed -i -e 's/name="\/"/name="\/keycloak\/"/' $JBOSS_HOME/standalone/configuration/standalone.xml RUN sed -i -e 's/name="\/"/name="\/keycloak\/"/' $JBOSS_HOME/standalone/configuration/standalone-ha.xml RUN sed -i -e 's/\/auth/\/keycloak\/auth/' $JBOSS_HOME/welcome-content/index.html RUN sed -i -e 's/<web-context>auth<\/web-context>/<web-context>keycloak\/auth<\/web-context>/' $JBOSS_HOME/domain/configuration/domain.xml