Configure reverse-proxy for Keycloak docker with custom base URL

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:latestUSER jbossRUN 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

The redirekt from "/keycloak" to "/keycloak/auth" isnt working. The Redirekt Route in index.html and Base-URL is missing the "/keycloak" part. I had to add this:

FROM jboss/keycloak:latestUSER jbossRUN sed -i -e 's/<web-context>auth<\/web-context>/<web-context>keycloak\/auth<\/web-context>/' $JBOSS_HOME/standalone/configuration/standalone.xmlRUN sed -i -e 's/<web-context>auth<\/web-context>/<web-context>keycloak\/auth<\/web-context>/' $JBOSS_HOME/standalone/configuration/standalone-ha.xmlRUN sed -i -e 's/name="\/"/name="\/keycloak\/"/' $JBOSS_HOME/standalone/configuration/standalone.xmlRUN sed -i -e 's/name="\/"/name="\/keycloak\/"/' $JBOSS_HOME/standalone/configuration/standalone-ha.xmlRUN sed -i -e 's/\/auth/\/keycloak\/auth"/' $JBOSS_HOME/welcome-content/index.html

Building on @Francois Maturel's response: for the latest Keycloak (currently 4.8.x), I had to add an additional line to replace the web-context in standalone-ha.xml as well:

FROM jboss/keycloak:latestUSER jbossRUN sed -i -e 's/<web-context>auth<\/web-context>/<web-context>keycloak\/auth<\/web-context>/' /opt/jboss/keycloak/standalone/configuration/standalone.xmlRUN sed -i -e 's/<web-context>auth<\/web-context>/<web-context>keycloak\/auth<\/web-context>/' /opt/jboss/keycloak/standalone/configuration/standalone-ha.xml

The reason is that the docker-entrypoint.sh startup script will use standalone-ha.xml configuration in addition to standalone.xml unless the -c flag is passed. See here: https://github.com/jboss-dockerfiles/keycloak/blob/master/server/tools/docker-entrypoint.sh