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What the test and reload actions do
Nginx UI documents nginx -t as its default configuration test command and nginx -s reload as its default reload command. These defaults can be changed through settings such as TestConfigCmd, ReloadCmd, ConfigDir, PIDPath and, in documented versions, SbinPath. Check the documentation for the version you have installed because available settings and defaults can vary. See the Nginx UI configuration guide.
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NGINX’s -t checks configuration syntax and tries to open files referenced by the configuration; it does not apply the configuration to the running service. The -T option performs the test and also prints the configuration to standard output. A reload asks the NGINX master process to load the configuration, start workers with it and gracefully shut down the old workers. See the NGINX command-line parameters documentation.
If the configuration test fails
Use the same binary, configuration and options
Run the test with the same NGINX binary, configuration path or prefix, and relevant options that Nginx UI uses. Starting with the documented default, that is nginx -t; if the UI has a custom TestConfigCmd, diagnose that command instead. A test run against a different binary or config file may pass while the UI’s test still fails, or vice versa.
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Follow the specific file or directive in the error
Because the test attempts to open referenced files, inspect the exact path named in the output. It may identify a syntax problem, an included configuration file, a certificate or key, a log path, or another file the configuration references. Check that the path exists and that the identity running the test can access it. Use nginx -T when you need to see the configuration NGINX parses as well as test it.
If the test passes but reload fails
Check the command and target process
Inspect the configured ReloadCmd and confirm it controls the NGINX instance that serves the site. In particular, compare the configured binary and paths with the active installation, including SbinPath, ConfigDir and PIDPath where applicable. A passing test does not guarantee that the reload command reaches the same master process.
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Check execution identity and permissions
The reload command must run with an execution identity that can control the intended NGINX master process. Review command output and the relevant NGINX error log for permission or PID-file access problems. Syntax and permission problems are documented causes of reload errors in the NGINX Gateway Fabric troubleshooting guide; its container-specific examples illustrate possible failure categories, not a universal Nginx UI log location or deployment layout.
Check where Nginx UI runs the command
Host, container and Host via SSH setups can see different binaries, files, users and environments. A command launched inside the UI container may address a different NGINX process than one run on the host. Nginx UI documents that, in Host via SSH mode, a non-empty configured test, reload or restart command runs on the host through /bin/sh -c as the SSH user. Account for that user’s PATH, permissions and environment when reproducing the error. The Nginx UI configuration guide describes the command settings and execution mode.
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Nginx UI’s getting-started documentation also distinguishes managing host NGINX from managing NGINX inside a container. Confirm that the UI’s installation and configuration point at the instance you intend to manage; see Nginx UI’s getting-started guide.
If test and reload succeed but the site looks unchanged
Verify the edited file is included
A successful test only establishes that the configuration NGINX checked is valid and its referenced files could be opened. It does not establish that the file you edited belongs to the active configuration. Nginx UI uses a Debian-style sites-available and sites-enabled layout by default. On other distributions, the active nginx.conf may need matching include directives. Check the getting-started guide’s notes on configuration layout and ensure the edited file is part of the include tree.
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Verify the request reaches the changed server or location
Check that the active server and location blocks match the hostname, path and request you are testing, and that the reload reached the NGINX process serving that request. NGINX configuration changes do not affect service until NGINX is reloaded or restarted, as explained in the NGINX Beginner’s Guide.
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If the issue is specifically with controlling a running Nginx UI instance through its management API, the CLI guide shows nginx-ui ctl ... nginx test and nginx-ui ctl ... nginx reload. These commands diagnose that management path; they are not a substitute for checking the configured NGINX command and target process in other setups. See the Nginx UI CLI guide.
Quick Recap
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