Can not update or save settings on SonarQube behind Nginx reverse proxy - docker

Question

I've an instance of sonarqube and nginx both in docker.
Sonarqube is behind nginx and it works fine, I can access it BUT I can not update anything in sonarqube UI such as installing plugins in Marketplace.
When I press install or update my account details it says:
It looks like it fails to pass cookies and authentication token when making Ajax calls. When pressing install button on plugin marketplace, it makes a POST call to: http://localhost:8089/sonarqube/api/plugins/install
Have I missed anything in nginx config?
worker_processes 1;
events { worker_connections 1024; }
http {
sendfile on;
server {
location /sonarqube {
proxy_pass http://sonarqube:9000;
proxy_read_timeout 90s;
proxy_redirect http://sonarqube:9000 http://localhost:8089;
}
}
}
version: "3.5"
services:
nginx:
build:
context: .
dockerfile: Dockerfile.nginx
ports:
- "8089:8080"
networks:
- sonarnet
sonarqube:
build:
context: .
dockerfile: Dockerfile.sonarqube
expose:
- "9000"
networks:
- sonarnet
environment:
- SONARQUBE_JDBC_URL=jdbc:postgresql://db:5432/sonar
- SONARQUBE_JDBC_USERNAME=sonar
- SONARQUBE_JDBC_PASSWORD=sonar
- sonar.forceAuthentication=true
- sonar.web.context=/sonarqube
########### The following line fixed the problem:###########
- sonar.core.serverBaseUrl = localhost:8089/sonarqube
############################################################
volumes:
- sonarqubeConf:/opt/sonarqube/conf
- sonarqubeLogs:/opt/sonarqube/logs
db:
image: postgres
networks:
- sonarnet
environment:
- POSTGRES_USER=sonar
- POSTGRES_PASSWORD=sonar
volumes:
- postgresql:/var/lib/postgresql
- postgresqlData:/var/lib/postgresql/data
networks:
sonarnet:
driver: bridge
......
After spending a whole day, I found the solution. As sonar is behind the reverse proxy and accessible as localhost:8089/sonarqube, we need to specify sonar.core.serverBaseUrl as well. So adding the following env variable solved the problem: - sonar.core.serverBaseUrl = localhost:8089/sonarqube