pgadmin4 wont work in specific location behind nginx

Question

I got some trouble: pgadmin working perfect behind nginx in location /, but it wont work behind location /pgadmin Work great:

location / {
         proxy_http_version 1.1;
         proxy_set_header X-Real-IP  $remote_addr;
         proxy_set_header X-Forwarded-For $remote_addr;
         proxy_set_header Host $host;

         proxy_pass         http://127.0.0.1:5050;
}

Wont work:

location /pgadmin {
         proxy_http_version 1.1;
         proxy_set_header X-Real-IP  $remote_addr;
         proxy_set_header X-Forwarded-For $remote_addr;
         proxy_set_header Host $host;

         proxy_pass         http://127.0.0.1:5050;
}

May be i need some specific rewrite?

Answer 1

For version pgAdmin 4 v3.0, until the issue is actually fixed, here's a quick command-line hack based on this.

cat > quickfix.txt <<THE_END
class ReverseProxied(object):
    def __init__(self, app):
        self.app = app
    def __call__(self, environ, start_response):
        script_name = environ.get("HTTP_X_SCRIPT_NAME", "")
        if script_name:
            environ["SCRIPT_NAME"] = script_name
            path_info = environ["PATH_INFO"]
            if path_info.startswith(script_name):
                environ["PATH_INFO"] = path_info[len(script_name):]
        scheme = environ.get("HTTP_X_SCHEME", "")
        if scheme:
            environ["wsgi.url_scheme"] = scheme
        return self.app(environ, start_response)
app.wsgi_app = ReverseProxied(app.wsgi_app)

THE_END

sudo sed -i '/app = create_app()/r quickfix.txt' /usr/local/lib/python3.5/dist-packages/pgadmin4/pgAdmin4.py
rm quickfix.txt

The commands above insert a piece of code into the file /usr/local/lib/python3.5/dist-packages/pgadmin4/pgAdmin4.py, right after the line app = create_app().

Also, make sure the path to pgAdmin4.py on your system is correct. You may need to adjust the snippet above.

Then, configure nginx as follows:

location /pgadmin-web/ {
        proxy_pass http://127.0.0.1:5050/;
        proxy_redirect      off;
        proxy_set_header    Host                    $host;
        proxy_set_header    X-Real-IP               $remote_addr;
        proxy_set_header    X-Forwarded-For         $proxy_add_x_forwarded_for;
        proxy_set_header    X-Forwarded-Proto       $scheme;
        proxy_set_header    X-Script-Name           /pgadmin-web;
}

For reference, also have a look at pgAdmin4.py on GitHub.

Answer 2

This was a bug in pgAdmin4 version 1.6, It is fixed now and will be available in next release.

Ref: Link

Answer 3

The fix seems to be not needed anymore.

According to Redmine issue, SCRIPT_NAME env var could be used (at least with latest official docker image).

Docker Compose snippet from the issue (working for me):

version: "3" 

services:

  pgadmin4:

    image: dpage/pgadmin4:latest

    environment:
      - PGADMIN_DEFAULT_EMAIL=bla@bla.com
      - PGADMIN_DEFAULT_PASSWORD=thepwd
      - SCRIPT_NAME=/pgadmin4

    volumes:
      - pgadm:/var/lib/pgadmin

    labels:
      - "traefik.enable=true" 
      - "traefik.backend=pgadmin4" 
      - "traefik.frontend.priority=600" 
      - "traefik.frontend.rule=Method:GET" 
      - "traefik.frontend.rule=PathPrefix:/pgadmin4"      

  postgis:
    image: mdillon/postgis:9.6-alpine

    volumes:
      - pgdb:/var/lib/postgresql/data

    expose:
      - 5432

    env_file:
      - pg.env

    labels:
      - "traefik.enable=false" 

volumes:
  pgdb:
  pgadm: