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pgAdmin 4 server mode runs as a multi-user web application rather than a single desktop window. Install it on a host or deploy the official container, initialize an administrator account, run one Python process, and place a correctly configured reverse proxy in front when needed. If you publish it below /pgadmin4 instead of at the site root, coordinate the application’s SCRIPT_NAME, proxy paths, headers, and cookie scope or login redirects will point to the wrong location.
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What server mode is and why the setup matters
From pgAdmin 4 version 2 onward, server mode is the default configuration. The desktop runtime changes that behavior automatically, but a web deployment does not: users must authenticate before using pgAdmin, and initialization creates an initial superuser. That account can later create additional superusers and ordinary users.
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Each user’s file access is confined to a virtual root beneath the configured STORAGE_DIR. The service therefore needs write access to its configuration database, session storage, and storage directories, while those locations should remain inaccessible to unrelated operating-system users.
pgAdmin features that depend on affinity to one database connection require a single Python process. You can use threads inside that process, but do not increase the number of Python workers unless your architecture explicitly preserves the required connection affinity. The commonly shown Gunicorn setting of one worker and 25 threads is an example configuration, not a throughput or user-capacity guarantee.
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Choose a deployment shape before installing
| Decision | Host-managed installation | Container installation |
|---|---|---|
| Packaging | Install a native package or Python wheel and manage the service with the host’s process tooling. | Run the official dpage/pgadmin4 image and manage it with Docker or a Kubernetes-style platform. |
| Web serving | Serve through Apache HTTPD with mod_wsgi, standalone Gunicorn, standalone uWSGI, or a reverse proxy such as NGINX or Caddy. |
Expose the container’s HTTP or TLS listener directly, or put your platform ingress/reverse proxy in front of it. |
| Persistence | Keep the configuration database, sessions, and STORAGE_DIR on protected host paths writable by the service account. |
Map the image’s documented pgAdmin data and configuration directories to persistent volumes. |
| Restricted security context | Use the ports and permissions allowed by the host service account. | The entrypoint supports non-privileged listeners such as HTTP 8080 and TLS 8443 when privileged ports are unavailable. |
| URL layout | Can be mounted at the domain root or under a prefix such as /pgadmin4. |
Use the same prefix rules when an ingress publishes the container below a subdirectory. |
Choose a host-managed deployment when operating-system service management and local filesystem control are important. Choose the container when image-based upgrades, orchestration, or a restricted runtime are the better fit. In either case, the application-level requirements are the same: first-run authentication, writable state, one Python process, and correctly forwarded scheme and script-name information.
Install pgAdmin 4 on a host
Install the package or wheel in the service environment
Install the pgAdmin 4 native package supplied for your operating system, or install the Python wheel into the virtual environment that will run the WSGI application. Keep the application and its state directories separate from temporary build files, and record the account that will own the service.
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Add local configuration without editing the shipped file
When the defaults need to change, create config_local.py beside pgAdmin’s shipped config.py. Keep deployment-specific values in that local file so package upgrades do not overwrite them. Typical settings include storage locations, session behavior, and other site-level options that your chosen deployment requires.
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After creating or changing the file, restart the web process. Validate that the process account can read the file and write the configured state paths before attempting the first login; a permissions failure at this stage often appears as a generic server error in the browser.
Initialize the first administrator
- Start pgAdmin through the selected WSGI server or web-serving integration.
- Open the published URL from a browser.
- Complete the first-run form with the email address and password for the initial superuser.
- Sign in with that account and create additional superusers or non-superusers as required.
Server mode does not provide anonymous access. Protect the initial credentials as you would any other administrative account, and use HTTPS before exposing the login page beyond a trusted local network.
Run pgAdmin with Gunicorn or another WSGI server
Use one worker and threads only inside that process
A representative Gunicorn launch uses one worker and multiple threads:
gunicorn --workers=1 --threads=25 pgadmin4.pgAdmin4:appThe module path and executable location must match the package or wheel installation on your host. Treat --workers=1 --threads=25 as an illustrative starting point from the deployment guidance, not as a sizing recommendation. If you use uWSGI, apply the same single-Python-process constraint and adapt its module, socket, and environment settings to your installation.
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Choose a direct listener or a local socket
For a private network, Gunicorn or uWSGI can listen on a local TCP port. A reverse proxy can instead connect over a Unix socket, keeping the application listener off the network. Whichever transport you choose, ensure the proxy account can reach the socket or port and that the host firewall does not expose an unintended administrative endpoint.
Apache HTTPD and other supported front ends
Apache HTTPD with mod_wsgi, standalone Gunicorn, standalone uWSGI, NGINX, and Caddy are all supported deployment patterns. The critical behavior is not the brand of front end; it is that the front end forwards the original scheme and any configured URL prefix while preventing clients from supplying those values themselves.
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Forward only trusted scheme and script-name headers
pgAdmin honors X-Script-Name and X-Scheme unconditionally. A reverse proxy must therefore overwrite or remove incoming values before forwarding the request. Otherwise a client can influence the URL pgAdmin constructs for redirects, links, or cookies.
- Set
X-Schemeto the scheme used by the public request, normally the value represented by the proxy’s HTTPS termination. - Set
X-Script-Nameto the public path prefix when pgAdmin is mounted below a subdirectory; omit it or set it consistently for a root deployment. - Pass the request to the local Gunicorn or uWSGI TCP listener or Unix socket.
- Preserve the host and forwarding information required by your TLS and virtual-host arrangement.
In NGINX, define a location for the application path and explicitly set the headers rather than allowing client-provided values to pass through. Caddy and other proxies need the same logical treatment even though their configuration syntax differs.
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Root URL deployment
When pgAdmin is published at the domain root, proxy requests for / and its descendants to the WSGI server, set the scheme header to the externally visible scheme, and avoid adding a script-name prefix. Test both the login page and a post-login navigation link so that redirects stay on the same host and scheme.
Subdirectory deployment at /pgadmin4
A prefix deployment requires three pieces to agree:
- Set
SCRIPT_NAME=/pgadmin4in the Gunicorn or uWSGI environment. - Preserve the
/pgadmin4prefix in the reverse-proxy routing and setX-Script-Name: /pgadmin4on forwarded requests. - Scope session cookies and any application URL rewriting to the same public path.
Proxy both the bare prefix and descendants. In NGINX terms, handle an exact /pgadmin4 location as well as a /pgadmin4/ location. The bare path is often redirected to add a trailing slash; if that request is not proxied, the redirect can escape to the site root.
A minimal header portion of a prefix-aware proxy looks like this:
proxy_set_header X-Script-Name /pgadmin4;
proxy_set_header X-Scheme $scheme;
proxy_pass http://127.0.0.1:5050;Use the equivalent directives for your socket or upstream definition, and ensure the proxy does not accept a client-supplied value for either header. If login sends you to /login instead of /pgadmin4/login, or if the browser repeatedly bounces between the two paths, check all three prefix settings before changing application code.
Deploy the official container
Set first-run credentials
The official image is dpage/pgadmin4. Supply PGADMIN_DEFAULT_EMAIL and PGADMIN_DEFAULT_PASSWORD when creating the container so the first-run administrator can be initialized non-interactively. Treat those values as secrets: use your platform’s secret mechanism rather than committing them to a compose file or shell history where possible.
To enable TLS in the image, set PGADMIN_ENABLE_TLS=True and mount the certificate and private key at the locations expected by the image configuration. If TLS terminates at an ingress instead, keep the external scheme and forwarded headers consistent with the proxy rules described above.
Persist state with volumes
Map the container’s documented pgAdmin data and configuration directories to persistent volumes. Without those mounts, the configuration database, sessions, saved server registrations, and other state can disappear when the container is replaced. The volume must be writable by the user under which the image runs.
Use PGADMIN_CONFIG_ environment variables for settings that must be injected at container creation, but prefer a persistent config_local.py for durable local overrides when the image supports mounting it. Keep one authoritative source for each setting so an environment override does not silently contradict the file.
Understand servers.json initialization
A servers.json file is read when the pgAdmin configuration database is created for the first time. It is not re-imported on every restart. To apply a changed server definition, follow the image’s import procedure or recreate the configuration database deliberately after preserving any data you need; simply restarting an existing container will not reload the file.
Run in restricted environments
OpenShift-style security contexts and containers started with --cap-drop=ALL are supported. When the runtime cannot bind privileged ports, configure the image or platform to use non-privileged HTTP port 8080 or TLS port 8443, then expose those ports through the service or ingress. Confirm that the mounted data directories remain writable under the restricted container identity.
Quick Recap
Secure and operate the installation
- Encrypt the session: terminate HTTPS at the reverse proxy or enable container TLS before allowing untrusted users to reach the login form.
- Protect state: restrict configuration, session, and storage directories to the pgAdmin service account and trusted administrators.
- Keep one Python process: do not scale Gunicorn or uWSGI workers horizontally unless the deployment preserves the connection affinity required by pgAdmin features.
- Sanitize proxy headers: overwrite or remove incoming
X-Script-NameandX-Schemevalues. - Keep prefix settings together: configure
SCRIPT_NAME, proxy path matching, forwarded headers, and cookie scope as one change. - Back up persistent state: include the configuration database and storage directory in the same backup plan, and test restoration rather than backing up only the container image.
- Separate secrets from configuration: protect the initial superuser password and any TLS private key from source control and general-read filesystem permissions.
Troubleshoot common failures
| Symptom | Likely cause | What to check |
|---|---|---|
Login redirects to the domain root from a /pgadmin4 installation |
SCRIPT_NAME, X-Script-Name, or proxy path handling is missing. |
Set the environment value and header to /pgadmin4, proxy both the bare and trailing-slash paths, and verify cookie scope. |
| Repeated redirect loop at the prefix | The bare-prefix request is not reaching pgAdmin, or the proxy and application disagree about the trailing slash. | Add an exact match for /pgadmin4 alongside the descendant location and inspect the Location response header. |
| Unexpected redirects or links use the wrong scheme | A client-supplied or incorrect X-Scheme value is reaching the application. |
Overwrite the header at the proxy with the externally visible scheme. |
| First run fails with a database or session write error | The runtime account cannot write configured state directories. | Check ownership and permissions for the configuration database, session storage, and STORAGE_DIR. |
| Container loses users or settings after replacement | State was stored only in the writable container layer. | Map the documented data/configuration directories to persistent volumes and verify they survive a restart. |
Imported servers do not change after editing servers.json |
The file is an initialization input, not a continuously watched file. | Use the image’s import process or recreate the configuration database according to your retention plan. |
| Features behave inconsistently with multiple workers | Requests are moving between Python processes without the required database-connection affinity. | Return to one worker and use threads within that process, then retest. |
| Container cannot bind the selected port | The security context does not permit privileged ports. | Use a non-privileged listener such as 8080 for HTTP or 8443 for TLS and publish it through the platform service. |
Pre-launch verification
- Confirm whether the service is published at the root or under a prefix, and write that decision into the proxy configuration.
- Verify that the chosen package, wheel, or container starts the pgAdmin WSGI application successfully.
- Check that exactly one Python worker is configured.
- Test write access as the actual service or container identity to the configuration database, session directory, and
STORAGE_DIR. - Create and protect the initial superuser, then test a second account with the intended permission level.
- Test login, logout, a post-login redirect, and a browser refresh through the public URL.
- If using a prefix, test both
/pgadmin4and/pgadmin4/, including an unauthenticated request. - Confirm HTTPS behavior, sanitized forwarding headers, persistent volumes, and backup coverage before opening access to users.
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