If you have multiple services running on Docker with different ports, you have to open ports in your firewall and you have to access the services via different ports in the browser. To have one access port (port 80 or 443) you can use a reverse proxy.

In our case we used NGINX to redirect the access to Kibana (Elasticsearch Dashboard Tool) and PgAdmin4 (PostgreSQL Admin Tool) so that we can access both services on the same port (80) in the browser with different base paths: http://localhost/kibana and http://localhost/pgadmin.

docker-compose.yml:

version: '3.0'
services:
  elasticsearch:
    hostname: elasticsearch
    image: elasticsearch:7.5.0
    ports:
      - 9200:9200
      - 9300:9300
    volumes:
      - esdata:/usr/share/elasticsearch/data
    environment:
      - discovery.type=single-node
      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"  

  kibana: 
    hostname: kibana
    image: kibana:7.5.0
    depends_on:
      - elasticsearch        
    environment:
      - XPACK_MONITORING_ENABLED=false
      - LOGGING_QUIET=true
      - SERVER_BASEPATH=/kibana
      - SERVER_REWRITEBASEPATH=true    

  postgres:
    hostname: postgres
    image: postgres:12.1
    ports:
      - 5432:5432
    volumes:
      - postgresdb:/var/lib/postgresql/data
    environment:
      - POSTGRES_PASSWORD=manager

  pgadmin: 
    hostname: pgadmin
    image: dpage/pgadmin4
    volumes:
      - pgadmin:/var/lib/pgadmin
    environment:
      - PGADMIN_DEFAULT_EMAIL=postgres
      - PGADMIN_DEFAULT_PASSWORD=manager
      - GUNICORN_ACCESS_LOGFILE=/dev/null

  proxy:
    hostname: proxy
    image: nginx:1.17.8
    ports:
      - 80:80
    volumes:
      - ./nginx.conf:/etc/nginx/nginx.conf
    depends_on:
      - kibana 
      - pgadmin  

volumes:  
  esdata:
  postgresdb:
  pgadmin:

nginx.conf

user  nginx;
worker_processes  auto;

error_log  /var/log/nginx/error.log warn;
pid        /var/run/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /dev/null;

    sendfile        on;
    #tcp_nopush     on;

    keepalive_timeout  65;

    #gzip  on;

    server {
        listen 80;

        root /var/www;
        index index.html;

        location / {
            try_files $uri $uri/ =404;
        }
        
        location /pgadmin {
            proxy_pass http://pgadmin/;
            proxy_http_version 1.1;
            proxy_set_header X-Script-Name /pgadmin;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection 'upgrade';
            proxy_set_header Host $host;
            proxy_cache_bypass $http_upgrade;
        }

        location /kibana {
            proxy_pass http://kibana:5601/kibana;
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection 'upgrade';
            proxy_set_header Host $host;
            proxy_cache_bypass $http_upgrade;
        }                    
    }
}