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pgAdmin 4 server mode runs as a multi-user web application rather than a single-user desktop window. You install it on a host or in the official dpage/pgadmin4 container, create an initial superuser, give the service account write access to pgAdmin’s data and storage directories, and serve the application through a WSGI server such as Gunicorn or uWSGI. If it is placed behind NGINX, Apache, Caddy, or another proxy—especially below /pgadmin4—the process and proxy must agree on the external URL. The deployment must also keep one Python process for features that depend on affinity to one database connection.
What server mode changes
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 provide an anonymous local interface: users must log in before using pgAdmin. Initialization creates an initial superuser, who can then add other superusers and ordinary users.
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Each user’s file access is confined to a virtual root beneath the configured STORAGE_DIR. That boundary is important when pgAdmin is shared by several people: a user does not automatically gain unrestricted access to the host filesystem simply because the web application can connect to a database.
Server mode is therefore a small web service with four operational concerns: an application process, writable configuration/session/storage locations, authentication, and a front-end URL that remains consistent from the browser through the proxy to the WSGI application.
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Choose a deployment shape before installing
| Choice | Best fit | What you must operate |
|---|---|---|
| Native package or Python wheel | A host-managed service with local files and an operating-system service account | Python/pgAdmin installation, writable directories, the WSGI process, updates, and backups |
| Apache HTTPD with mod_wsgi | An organization that already standardizes on Apache for WSGI applications | Apache virtual-host configuration, WSGI settings, permissions, and one-process behavior |
| Standalone Gunicorn | A simple, dedicated application service | A Gunicorn command or service definition and local listening socket/port |
| Standalone uWSGI | An environment already using uWSGI | uWSGI application and environment settings, including any URL prefix |
| Reverse proxy in front of Gunicorn or uWSGI | HTTPS termination, a shared web server, or a public hostname | Proxy routing, header sanitization, cookie/path consistency, and TLS |
| Official container image | Docker, Kubernetes-style, OpenShift, or another image-based platform | Environment variables, persistent mounts, secrets, health/restart policy, and image upgrades |
A direct WSGI listener can be useful for a private network, but a reverse proxy is normally the better edge: it can provide HTTPS, restrict access, and keep the application socket off the public interface. Whichever form you select, plan where the configuration database, session data, and STORAGE_DIR will live before the first startup.
Install pgAdmin on a host
1. Create the service identity and directories
Run the application under a dedicated, non-login account rather than an everyday administrator account. Create the directories used for the configuration database, sessions, and storage, then make that account their owner. The web process must be able to create and update files there; a read-only installation will fail during initialization or login.
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2. Install a supported package or Python wheel
Use the pgAdmin package supplied for your operating system or install the project’s Python wheel in the virtual environment selected for the service. A package installation usually supplies the application and integration files; a wheel installation gives you control over the Python environment. Do not mix files from several installations in one service definition. Record the executable and module paths so the WSGI server starts the same installation you tested.
3. Add local settings without editing defaults
Place a file named config_local.py beside pgAdmin’s main config.py. Local settings in this file override defaults while leaving the packaged file intact, which makes upgrades safer. Use it for deployment-specific locations and behavior that must survive a package update.
# config_local.py
# Set only the values required by this deployment.
# Example names shown here are illustrative; use paths owned by the service account.
STORAGE_DIR = '/srv/pgadmin/storage'
Set the configuration-database and session locations using the settings documented for the pgAdmin version you installed. If you relocate any of them, create the destination first and verify that the service account can write, rename, and delete a test file. A path that is writable by an interactive administrator but not by the WSGI account is a common cause of an apparently successful install that cannot complete first-run setup.
4. Start the first-run initialization
Launch pgAdmin through the WSGI server or the integration supplied by your package, then open its external URL. The first-run flow asks for the initial superuser identity and password. Store those credentials in your organization’s password manager; they control user administration and should not be reused for a database account.
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After signing in, create additional superusers only for people who need administration. Give routine users non-superuser accounts. The login requirement applies to every user, including someone connecting from the same machine as the service.
Run pgAdmin with Gunicorn or uWSGI
Use one Python worker
Some pgAdmin features need affinity to one database connection. The deployment guidance therefore calls for a single Python process. More workers are not a free performance improvement: separate processes can hold separate connection state and produce unreliable behavior for those features.
A representative Gunicorn invocation is:
gunicorn --workers=1 --threads=25 pgadmin4.pgAdmin4:appThe --workers=1 setting is the important part. The --threads=25 value is an illustrative configuration from the deployment guidance, not a user-count or capacity guarantee. Add the bind address, Unix-socket path, working directory, and environment settings required by your installation. The module path can differ between a distribution package and a wheel, so confirm it against the files installed on your host.
uWSGI can be used instead when that is your standard WSGI server. Apply the same single-process rule and pass the same application environment, including SCRIPT_NAME when the service is published below a URL prefix. Test the application directly on its local socket or port before introducing a proxy; this separates pgAdmin problems from proxy-routing problems.
Put a reverse proxy in front
Terminate HTTPS at the proxy or enable TLS in the container deployment described below. Forward requests to the Gunicorn or uWSGI Unix socket or local TCP port, and keep that backend listener private. The proxy must also control the headers that describe the public request.
Sanitize script and scheme headers
pgAdmin honors X-Script-Name and X-Scheme unconditionally. A client must not be able to submit those headers and change the URL or scheme that pgAdmin believes it is serving. Overwrite them with values derived from the proxy configuration, or remove them when they are not needed.
# NGINX-style example; adapt the upstream socket and TLS policy.
location = /pgadmin4 {
proxy_set_header X-Script-Name /pgadmin4;
proxy_set_header X-Scheme $scheme;
proxy_pass http://pgadmin4_backend;
}
location ^~ /pgadmin4/ {
proxy_set_header X-Script-Name /pgadmin4;
proxy_set_header X-Scheme $scheme;
proxy_pass http://pgadmin4_backend;
}The two locations are deliberate. One matches the bare prefix and the other matches everything beneath it. If the bare /pgadmin4 request is handled by a different location, pgAdmin’s redirect to /pgadmin4/ can bypass the backend and appear to loop.
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Use equivalent header and path rules in Apache, Caddy, or another reverse proxy. Preserve the external prefix when forwarding, and ensure the proxy’s cookie path and redirect handling do not silently move users to the site root.
Publish pgAdmin under /pgadmin4
A sub-directory deployment needs three settings to agree: the WSGI environment, the proxy path, and the browser-visible cookie/redirect scope.
- Set
SCRIPT_NAME=/pgadmin4in the Gunicorn or uWSGI environment. This tells the application that the public URL includes the prefix. - Configure the proxy to match both
/pgadmin4and/pgadmin4/*, forwarding both forms to the same backend. - Set the matching
X-Script-Name: /pgadmin4header at the proxy. Do not pass a value supplied by the client. - Set
X-Schemefrom the connection that the proxy received, so redirects use HTTPS when TLS terminates there. - Open the bare prefix in a private browser session and verify that the redirect, login form, static files, and post-login requests all remain below
/pgadmin4.
If SCRIPT_NAME is missing, the proxy strips the prefix, or cookies are scoped to the wrong path, login redirects can target the site root. The visible symptom is often a redirect loop: the credentials are accepted, but the next request returns to the wrong URL. Fix the three layers together instead of adding another redirect rule.
Deploy the official container image
The official image is dpage/pgadmin4. It is suitable for Docker and Kubernetes-style deployments, but the image does not remove the need for persistent storage or an explicit first-run identity.
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Provide first-run credentials
Set PGADMIN_DEFAULT_EMAIL and PGADMIN_DEFAULT_PASSWORD through your container environment or secret mechanism before the first startup. Use a unique, long password and avoid putting it directly in a shell history or a publicly readable compose file. The email value becomes the initial superuser identity.
docker run --name pgadmin4
--env PGADMIN_DEFAULT_EMAIL='admin@example.com'
--env PGADMIN_DEFAULT_PASSWORD='S3cure-example-only-ChangeMe!'
dpage/pgadmin4The password in this example is for demonstrating the variable names and command shape; replace it with a randomly generated secret before deployment.
Persist the instance
Map the data and configuration locations documented for the image to durable storage. Without a persistent mount, removing and recreating the container can remove the configuration database, users, sessions, and other instance state. Back up the mounted data using the same consistency procedure you use for other application state.
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Use PGADMIN_CONFIG_ environment variables for image-time overrides when appropriate. For settings that must remain stable across restarts and image upgrades, a persistent config_local.py is the preferred local override. Keep secrets in the platform’s secret facility rather than baking them into an image.
Enable TLS in the container when the proxy is not terminating it
Set PGADMIN_ENABLE_TLS=True and mount the certificate and private-key files where the image expects them. Protect the key with filesystem permissions and rotate both files according to your certificate policy. If a reverse proxy already provides HTTPS, leave TLS termination in one deliberate place and forward only over a trusted local or cluster network.
Understand servers.json initialization
A servers.json file is read when the configuration database is created for the first time. It is not reloaded on every container restart. If you edit the file after initialization, the running instance will not automatically import the changes; use pgAdmin’s server-management interface or recreate the configuration database only when that data loss is acceptable.
Run in restricted environments
OpenShift and containers started with --cap-drop=ALL are supported when the security context is configured correctly. The entrypoint can select non-privileged listeners such as port 8080 for HTTP and 8443 for TLS when the environment does not permit binding to privileged ports. Expose those ports through the platform service or reverse proxy rather than granting unnecessary capabilities.
Security and operations checklist
- Protect transport: use HTTPS at the reverse proxy or enable container TLS, and make sure any internal hop is on a trusted network.
- Protect the first superuser: store the credential securely, use a unique password, and create additional administrators only when required.
- Restrict filesystem access: configuration, session, and storage directories should be writable by the service account and inaccessible to unrelated users.
- Keep one Python process: do not increase worker count unless your architecture explicitly preserves the connection affinity required by pgAdmin features.
- Control proxy headers: overwrite or remove incoming
X-Script-NameandX-Scheme; never trust client-supplied values. - Keep prefix settings consistent: coordinate
SCRIPT_NAME, proxy matching, redirect handling, and cookie scope when publishing below a sub-directory. - Persist container state: map the documented data/configuration directories and back them up before image upgrades.
- Treat
servers.jsonas an initializer: import it before the first configuration-database creation, not as a continuously watched file. - Document the actual installation: record the package or image version, WSGI module path, socket/port, writable directories, proxy prefix, and secret-storage method so another administrator can reproduce the service.
Troubleshoot the failures that look like application bugs
The first page returns a permission error
Check ownership and mode on the configuration database directory, session directory, and STORAGE_DIR. Test as the service account, not as root or your login user. Also verify that every parent directory permits traversal. Correct the filesystem permissions, restart the single application process, and repeat initialization.
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Inspect the public URL, SCRIPT_NAME, both proxy path matches, X-Script-Name, and X-Scheme. A root-level redirect or a cookie whose path excludes /pgadmin4 indicates that one layer still believes pgAdmin is mounted at /. Remove client-provided headers and make the values identical at every layer.
Static files or API requests return 404 through the proxy
Confirm that the wildcard prefix location is selected for paths below /pgadmin4 and that the proxy forwards the original path in the way your configuration expects. Test the backend directly first; if direct access works, the remaining fault is path matching or URI rewriting at the proxy.
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Several workers cause intermittent behavior
Return to one Python worker. Features that rely on affinity to one database connection can fail when requests move between independent processes. Threads may be adjusted for your workload, but the illustrative --threads=25 setting is not a promise of capacity.
Container settings disappear after recreation
Verify that the image’s documented data/configuration directories are mounted to durable storage and that the container can write to them. Environment variables can recreate initial settings, but they do not substitute for persisting the configuration database and session/storage state.
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servers.json changes have no effect
That file is consumed only while the configuration database is first created. For an existing instance, add or edit servers in pgAdmin, or deliberately rebuild the configuration database after taking a backup and confirming the consequences.
The container cannot bind its configured port
In a restricted security context, use the non-privileged HTTP or TLS ports selected by the image entrypoint, such as 8080 or 8443, and expose them through the platform. Do not restore broad Linux capabilities solely to obtain a privileged port.
Validate the deployment before handing it to users
- Open the exact public hostname and path, including the prefix if one is configured.
- Create the initial superuser, sign out, and sign back in to confirm that sessions persist.
- Create a non-superuser and verify that the account can log in without administrative controls.
- Use the file interface to confirm that storage is confined to the configured virtual root.
- Restart the WSGI process or container and confirm that users, sessions, and registered servers remain according to your persistence plan.
- Send a request containing bogus
X-Script-NameandX-Schemeheaders from a test client; the proxy should replace them rather than allowing them to alter redirects. - Review logs for the backend and proxy separately. A direct-backend success with a proxied failure points to routing, headers, TLS, or cookie scope rather than pgAdmin initialization.
Which arrangement is appropriate?
Choose a package or wheel when the host team wants ordinary service management and local filesystem controls. Choose the container when deployment, scaling policy, and persistence are already managed as images and volumes. Use Gunicorn or uWSGI directly for a private, simple service; put Apache, NGINX, Caddy, or another hardened proxy in front when you need public HTTPS, shared hostnames, access controls, or a URL prefix.
The non-negotiable details are the same in every arrangement: server mode requires authenticated users and an initial superuser; the service account must write pgAdmin’s configured data and storage paths; connection-affinity-sensitive features require one Python process; and a sub-directory URL works only when the application environment, proxy headers, path matching, and cookies all describe the same prefix.
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