The Tool Desk
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What the deployment looks like
The reliable pattern is to separate the public edge from the Python application. Nginx listens on the public interface for the site’s hostname. CherryPy listens only on a private application endpoint such as 127.0.0.1:8080. Nginx accepts the browser’s request, optionally serves static files itself, and proxies the remaining paths to CherryPy.
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That arrangement gives you one public entry point while keeping the application listener off the public network. It also leaves room for multiple CherryPy instances behind one Nginx upstream. CherryPy’s deployment documentation describes reverse proxying as a common and easy setup, and documents both its own HTTP server and WSGI-based hosting.
Request path
- A browser requests the public hostname, for example
www.example.com. - Nginx receives the request on its public listener.
- Requests under
/static/can be mapped directly to files by Nginx. - Other paths are sent to the configured upstream, such as
127.0.0.1:8080. - Nginx forwards the host and client-address headers.
- CherryPy’s proxy tool uses those headers and the configured public base URL when the application builds URLs or reads request metadata.
Choose the application process model first
Nginx must point to the protocol and endpoint that actually exist behind it. Decide whether CherryPy will accept HTTP directly or whether a WSGI server will expose the application.
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Direct CherryPy HTTP server
CherryPy’s own HTTP server is documented as production-ready. In this model, CherryPy binds to a local HTTP port, and Nginx uses an HTTP proxy_pass target for that listener. This is the simplest deployment path and the baseline shown in the official deployment material.
CherryPy application hosted through uWSGI
For a WSGI process model, the application exposes a WSGI callable, CherryPy’s built-in HTTP server is disabled, the CherryPy engine is started, and uWSGI listens on a local endpoint. The documented example runs:
uwsgi --socket 127.0.0.1:8080 --protocol=http --wsgi-file mymod.py --callable wsgiappBecause that command exposes HTTP on the local socket through --protocol=http, Nginx still proxies HTTP to the endpoint. If you choose a different uWSGI protocol or socket arrangement, the Nginx upstream must be changed to match it; do not copy a proxy_pass value from the direct-CherryPy model without checking the listener.
Prepare CherryPy on a private listener
Set listener options in CherryPy’s global server configuration. The following minimal application configuration uses port 8080 and enables proxy awareness for a public site at http://www.example.com:
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import cherrypy
cherrypy.config.update({
"server.socket_port": 8080,
"tools.proxy.on": True,
"tools.proxy.base": "http://www.example.com",
})
cherrypy.quickstart(Root())Replace Root() with your application’s root object and replace the hostname with the value used by the Nginx server_name. The port is an example; use the same port in Nginx’s upstream block.
Why the proxy tool matters
Without proxy-aware settings, the application can see Nginx’s address instead of the original client address and can construct links against the internal listener rather than the public site. The official CherryPy guidance uses tools.proxy.on so CherryPy can use the forwarded client information and tools.proxy.base so its public URL context matches the configured hostname.
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Configure Nginx as the reverse proxy
Create an Nginx configuration for the public hostname. The representative CherryPy configuration below defines two possible application listeners, serves static files directly, and proxies every other path:
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upstream apps {
server 127.0.0.1:8080;
server 127.0.0.1:8081;
}
server {
listen 80;
server_name www.example.com;
location ^~ /static/ {
root /app/static/;
}
location / {
proxy_pass http://apps;
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-Host $server_name;
}
}Adapt the hostname, filesystem path, and listener addresses to the host. On Ubuntu, the CherryPy guide instructs operators to save the file under /etc/nginx/conf.d/; follow the layout used by your operating system if it differs.
What each part does
upstream apps: Names the group of application endpoints that Nginx can forward to.server 127.0.0.1:8080andserver 127.0.0.1:8081: Identify two local CherryPy instances. If you run only one instance, keep only the listener that exists.listen 80: Accepts public HTTP traffic in this baseline.server_name: Declares the hostname that should select this virtual server. It should match the public name used in CherryPy’s proxy base setting.location ^~ /static/: Sends static URL paths to Nginx’s filesystem handler instead of the application.proxy_pass http://apps: Forwards dynamic requests to the upstream group. Nginx’s reverse-proxy documentation identifiesproxy_passas the basic forwarding mechanism.proxy_redirect off: Prevents Nginx from rewriting redirect headers in this representative setup.Host,X-Real-IP,X-Forwarded-For, andX-Forwarded-Host: Carry the public host and client-address chain to CherryPy.
Understand the forwarded headers
The header settings are not decorative; they preserve information lost when a reverse proxy terminates the client connection.
| Header | Value in the baseline | Purpose |
|---|---|---|
Host |
$host |
Passes the requested hostname to the application. |
X-Real-IP |
$remote_addr |
Passes the address of the client that connected to Nginx. |
X-Forwarded-For |
$proxy_add_x_forwarded_for |
Preserves the existing forwarding chain while adding the current client address. |
X-Forwarded-Host |
$server_name |
Passes the public virtual-server hostname. |
CherryPy’s proxy tool is the application-side counterpart to these headers. Enable it when routes, redirects, logging, or access decisions need the public host and original client context. Ensure your application treats forwarded headers as trusted only when requests can reach it through the trusted proxy path; exposing the application listener publicly would allow clients to supply misleading values.
Deploy step by step
- Choose a private port. Select an unused local endpoint such as
127.0.0.1:8080. If you plan two instances, choose a second port such as127.0.0.1:8081. - Start CherryPy directly. Launch the application with
server.socket_portset to the selected port. For a WSGI deployment, instead expose the callable through the documented uWSGI command and disable CherryPy’s built-in HTTP server. - Test the local listener first. Request the application through its local endpoint before adding Nginx. Confirm that the expected route responds and that startup logs show the intended port. This isolates application failures from proxy errors.
- Write the Nginx configuration. Add the upstream and server blocks, adapting paths, hostname, and ports. Keep the upstream protocol consistent with the process model.
- Check the Nginx configuration. Run the platform’s Nginx configuration test command (commonly
nginx -t) and correct every syntax or path error before reloading. - Reload Nginx. Reload the service using the service manager on the host. A reload applies the validated configuration without requiring you to stop the application process.
- Test the public hostname. Request a dynamic route through the hostname in
server_name. Inspect the CherryPy log to verify that the forwarded host and client address are the values your application expects. - Test static paths separately. Request a known file below
/static/and confirm that Nginx finds it without invoking a dynamic route. A dynamic success does not prove that the filesystem mapping is correct. - Test each configured instance. When ports 8080 and 8081 are both listed, stop one instance temporarily and make requests through Nginx. Confirm that the remaining instance handles traffic as your availability plan expects, then restore the stopped process.
Serve static assets safely and efficiently
The documented example places /static/ in a direct Nginx location. This keeps routine file delivery out of the CherryPy request path and lets the application concentrate on dynamic work.
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The shown root /app/static/; is only an example filesystem location. Verify that the directory exists, that the Nginx worker can read it, and that the URL-to-file mapping is what you intend. A request for /static/css/site.css must resolve beneath the configured root according to your Nginx location layout. Check both a file that should exist and a path that should return a missing-file response.
Do not place a broad static location over dynamic routes accidentally. Keep the ^~ /static/ prefix and the application’s URL conventions aligned, then exercise static and dynamic paths independently after every configuration change.
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An Nginx upstream can list multiple CherryPy listeners. The documented pair, ports 8080 and 8081, gives Nginx two destinations and enables its upstream load-balancing behavior. Each process must run the same application version and expose the routes that Nginx may send to it.
Adding a second line does not start a second process. You must launch the additional CherryPy instance yourself, configure it to listen on the second port, and monitor both processes. During a rollout, validate one listener locally before adding it to the upstream. If an instance is stopped while it remains configured, requests assigned to it can fail; use the temporary-stop check to learn how your chosen Nginx behavior appears to clients and logs.
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Applications that keep user state only in process memory need an explicit session strategy before requests can move between instances. The supplied Nginx and CherryPy baseline does not define session storage or affinity, so make that an application-level decision rather than assuming that two upstream lines provide seamless state sharing.
Direct CherryPy or uWSGI?
| Choice | Listener model | Nginx target | What you configure |
|---|---|---|---|
| CherryPy HTTP server | CherryPy binds its own local HTTP port, such as 127.0.0.1:8080. |
An HTTP upstream pointing at that port. | Set server.socket_port; enable proxy settings when needed. |
| uWSGI WSGI process | CherryPy’s built-in server is disabled; uWSGI exposes the WSGI callable on a local endpoint. | An upstream matching the uWSGI protocol and endpoint; the documented command exposes HTTP on port 8080. | Define the callable, start the CherryPy engine, and launch uWSGI with the selected options. |
There is no requirement to add uWSGI merely because Nginx is present. CherryPy’s own server is a supported production baseline. Choose uWSGI when its WSGI process model fits your operational design, and then make Nginx’s upstream reflect the exact interface uWSGI provides.
HTTPS, redirects, timeouts, and buffering are separate decisions
The baseline configuration listens on port 80 and demonstrates HTTP proxying. A production site may terminate TLS at Nginx, redirect HTTP to HTTPS, or require application-specific timeout and buffering values. Those settings are not universal defaults: select them after identifying the application’s request durations, payload sizes, and public URL scheme.
When Nginx terminates TLS, make sure CherryPy’s proxy-aware base URL represents the HTTPS hostname users see. Otherwise generated links or redirects can point to the wrong scheme. Test normal pages, redirects, uploaded bodies, and long-running requests after applying any timeout or buffering policy.
Access-control rules and health checks also depend on your deployment. Restrict the CherryPy listener to the intended private interface, decide which networks may reach Nginx, and add active health checks only when their behavior and failure thresholds are understood. The cited baseline does not prescribe values for these options.
WebSockets require an explicit upgrade path
CherryPy’s advanced documentation identifies the external ws4py library as the source of WebSocket support. A WebSocket application therefore needs end-to-end upgrade handling in Nginx in addition to the ordinary HTTP proxy baseline. Do not assume that a configuration that serves pages and JSON automatically supports WebSocket handshakes.
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Test the upgrade request through the public hostname, verify that the application receives the upgraded connection, and confirm that idle and application-specific timeouts do not terminate it unexpectedly. Add the required upgrade headers and timeout policy only after deciding that the application actually uses WebSockets; they are unnecessary for a conventional HTTP-only site.
Quick Recap
Troubleshoot by isolating the failing hop
The local CherryPy request fails
- Check that the process is running and bound to the port named in the upstream.
- Confirm that the application’s global configuration uses the intended
server.socket_port. - If using uWSGI, verify that CherryPy’s built-in server is disabled and that the uWSGI command names the correct WSGI file and callable.
The local request works but the public request fails
- Run the Nginx configuration test and fix syntax, hostname, or path errors.
- Compare
proxy_passwith the actual listener protocol and port. - Inspect Nginx and CherryPy logs together to determine whether the request reached the upstream.
- Confirm that the request’s hostname matches
server_nameand that DNS or the local test host resolves it to Nginx.
The application sees the wrong host or client address
- Check all four forwarding directives in the proxy location.
- Ensure
tools.proxy.onis enabled in CherryPy. - Set
tools.proxy.baseto the public hostname and scheme rather than the private port. - Inspect application logs for the received host and forwarded address values.
Static files return errors while dynamic routes work
- Verify the
rootdirectory and the URL-to-file mapping for the/static/location. - Check read permissions for the Nginx worker account.
- Request an exact known filename and compare it with the path on disk.
One of two instances behaves differently
- Request each local port directly and compare application versions and configuration.
- Stop one process briefly to confirm which upstream receives requests and how failures are logged.
- Restore the process and remove stale or incorrectly configured listeners from the upstream block.
Operational checklist
- CherryPy responds on its private listener before Nginx is introduced.
- The upstream addresses and protocol match the selected process model.
- The public
server_namematches CherryPy’s proxy base URL. Host,X-Real-IP,X-Forwarded-For, andX-Forwarded-Hostare forwarded.- CherryPy’s proxy tool is enabled when public URL or original-client metadata is required.
- The Nginx configuration passes its syntax test before reload.
- Dynamic routes and
/static/paths are tested separately. - Every configured upstream instance is running, equivalent, and monitored.
- TLS, redirects, timeouts, buffering, access control, health checks, and WebSocket upgrades are configured only for requirements the application actually has.
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