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NGINX configuration is a hierarchy of directives and contexts. A directive is a setting that ends with a semicolon; a block directive contains other directives inside braces and creates a context. The usual HTTP path is main → http → server → location: global settings live in main, HTTP-wide settings in http, virtual hosts in server, and URI-specific behavior in location. Knowing that hierarchy tells you where a setting is legal, which value wins when settings differ, and why an included file sometimes causes a syntax error.
This guide explains the file structure, context rules, inheritance, request routing, include files, static serving and proxying, and a safe edit-and-reload workflow. It applies to open-source NGINX and NGINX Plus; exact package paths and service commands depend on your operating system and installation method.
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The primary file is usually named nginx.conf. It is plain text made from two constructs:
- Simple directives consist of a directive name, optional arguments, and a terminating semicolon, for example
worker_connections 1024;. - Block directives end with braces and can contain other directives. A block that accepts nested directives is called a context.
Anything outside a block is in the main context. The official beginner guide describes events, http, server, and location as contexts and defines directives outside every block as belonging to main (NGINX Beginner’s Guide).
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Whitespace and line breaks are not significant, so indentation is for people rather than the parser. A semicolon is significant: omitting one commonly produces an error when you test the file. Comments begin with # and continue to the end of the line.
The context hierarchy
Contexts determine both scope and legality. The main traffic-related contexts are:
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| Context | Purpose | Typical children or directives |
|---|---|---|
main |
Global process and logging settings | user, worker_processes, error_log, events, http, mail, stream |
events |
Connection-processing parameters | worker_connections and event-module settings |
http |
HTTP-wide defaults and modules | include, MIME types, logging, upstreams, and server |
server |
One virtual HTTP server selected by address, port, and host name | listen, server_name, root, and location |
location |
Handling for a URI set | Static-file settings, proxying, access rules, and try_files |
mail |
Mail protocols | Mail-proxy configuration |
stream |
Raw TCP and UDP traffic | Stream servers and upstreams |
For a normal web site, visualize the tree as main → http → server → location. A server block cannot be placed directly in main, and a location cannot be placed directly in http. NGINX checks these context rules while parsing the file. The administration guide’s configuration overview provides the canonical hierarchy and examples (Managing configuration files).
A minimal HTTP configuration, annotated
The following example shows where common directives belong. The comments identify each context; they are not required for operation.
user nobody; # main
events { # main → events
worker_connections 1024;
}
http { # main → http
include mime.types;
server { # http → server
listen 80;
server_name example.com;
root /srv/www;
location / { # server → location
try_files $uri $uri/ =404;
}
}
}user is global, connection capacity is under events, and HTTP behavior is under http. The server defines a virtual host, while the location describes what to do with requests whose URI matches that location.
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How the active configuration file is found
Package layouts are not universal. NGINX Plus documentation lists /etc/nginx as the usual Linux location and /usr/local/etc/nginx on FreeBSD, while open-source packages and source builds may use different paths. Do not assume that a file named /etc/nginx/nginx.conf is active.
Ask the installed binary which configuration path it was built to use:
nginx -VInspect the output for the --conf-path= build argument. Run the command with the same binary and permissions used by your service if multiple NGINX installations exist. This avoids editing a template or an old installation that the running daemon never reads.
Splitting configuration with include
The include directive inserts another file, or files matching a mask, exactly where the directive appears. Placement therefore controls the context of every line in the included file. The core-module documentation describes this directive and its legal contexts (NGINX core module documentation).
These patterns are common:
http {
include conf.d/http;
include vhosts/*.conf;
}The first form includes one file; the second loads every matching file. Because both statements are inside http, each included file must contain directives valid in http—usually one or more server blocks, maps, upstream definitions, or HTTP-wide defaults. A file containing events {} would be invalid there.
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Likewise, an include inside a server block may contain location blocks, but not another top-level http block. Treat included files as if their contents had been pasted at the include line. This mental model explains both successful modular layouts and errors such as “directive is not allowed here.”
Inheritance and overriding
In general, a child context inherits settings from its parent. A value set in http can therefore become the default for every server and location below it; a value set in a particular child can replace that inherited value. NGINX documents the exact behavior for each directive, including whether inheritance is automatic, merged, replaced, or disabled by a child declaration. Always check the directive’s Context field and inheritance notes rather than assuming that every setting behaves the same way.
| Where a setting is placed | Intended reach | Typical use |
|---|---|---|
http |
All HTTP servers and locations unless overridden | Common logging format, MIME types, or a default root |
server |
One virtual host and its locations | That site’s document root, TLS listener, or host-specific headers |
location |
Only requests selected by that location | A special API proxy, cache rule, or alternate static directory |
Inheritance is not the same as textual order. A directive may be valid at several levels but have special merge rules, and some directives are valid only in one context. If a setting appears to be ignored, first verify that the directive is legal at that level, then read its documented inheritance behavior.
How NGINX chooses a virtual server
For an HTTP request, NGINX first chooses a server block using the listening address and port, then compares the request’s Host value with server_name. If several blocks listen on the same address and port, the name match determines which virtual server handles the request. The request-processing documentation explains this selection sequence (How nginx processes a request).
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http {
server {
listen 80;
server_name example.com www.example.com;
root /srv/example;
}
server {
listen 80;
server_name api.example.com;
root /srv/api;
}
}A request for api.example.com is therefore evaluated in the second server, while the other names go to the first when they match its declarations. A request with an unexpected or missing host can fall to the default server for that listening address and port, so define an intentional default rather than relying on file order.
How location matching works
After selecting a virtual server, NGINX evaluates its locations. The documented high-level rule is that the most specific literal prefix is selected first; regular-expression locations are then considered in configuration order, subject to NGINX’s detailed matching rules. Read the request-processing documentation when combining prefixes and regular expressions, because a small modifier or ordering change can alter the result.
For example:
server {
listen 80;
server_name example.com;
location / {
try_files $uri $uri/ =404;
}
location /images/ {
root /srv/assets;
}
location ~ .php$ {
proxy_pass http://php_backend;
}
}The literal /images/ prefix is more specific than /. The regular expression for PHP files is evaluated according to the documented regex rules and its order relative to other regex locations. When debugging, list every matching prefix and regex, then verify which one NGINX actually selects rather than inferring behavior from indentation.
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Serving static files with root
A location can serve files directly. The root directive is valid in http, server, and location. NGINX appends the request URI to the selected root to construct the filesystem path. For instance, with root /srv/www;, a request for /css/site.css maps to /srv/www/css/site.css. The web-server overview and static-content guide document this behavior (NGINX web server; Serving static content).
A compact static site configuration is:
server {
listen 80;
server_name example.com;
root /srv/www;
location / {
try_files $uri $uri/ =404;
}
}Putting the common root at server makes it the default for all locations in that virtual host. A location can set a different root when a URI subtree maps to another directory. Check filesystem permissions and the resulting path when NGINX returns a 404 even though a file appears to exist.
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Passing requests to another server
Locations can proxy requests instead of serving files. A typical arrangement keeps the virtual-host identity and common headers at the server level, then puts the application handoff in a narrowly matched location:
http {
upstream app_backend {
server 127.0.0.1:8080;
}
server {
listen 80;
server_name example.com;
location /api/ {
proxy_pass http://app_backend;
}
}
}The important structural point is that the upstream definition belongs under http, while the proxy_pass action belongs in the location that should reach the application. Keep static and proxied URI spaces separate so a broad static location does not capture API requests accidentally.
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Configuration changes do not affect workers until NGINX successfully loads them. Use this sequence:
- Identify the active file. Run
nginx -Vand confirm the--conf-path=value, then inspect any files reached throughinclude. - Make a reversible edit. Preserve a copy or use version control. Change one logical setting at a time, and keep the surrounding context visible.
- Test syntax. Run
nginx -twith the intended configuration. The command reports the file and line when a semicolon is missing, a brace is unbalanced, an include cannot be parsed, or a directive is illegal in its context. - Reload after a successful test. Use your service manager’s reload operation, commonly
systemctl reload nginx, or send NGINX a reload signal withnginx -s reload. The official administration guide states that reload applies the new configuration without interrupting current requests (Managing configuration files). - Verify the result. Request the affected host and URI, inspect the error and access logs, and confirm that unrelated virtual hosts still respond correctly.
A restart is an alternative, but it is a more disruptive operational action than a reload. If the syntax test fails, do not reload; correct the reported line or restore the last known-good file first.
Common structural failures and fixes
- “Directive is not allowed here”: the directive is outside a context where its module permits it, or an included file was inserted at the wrong level. Move the include or directive to a legal parent context.
- Unexpected end of file: a closing brace is missing. Match every
{with a}, especially after editing nested locations. - Unknown directive: the installed build may not include the module that provides it, or the directive name may be misspelled. Check the build and the directive’s module documentation.
- Changes have no effect: you may have edited a file that is not active, failed to reload, or been overridden by a more specific server or location. Confirm
--conf-path, runnginx -t, reload, and trace virtual-server and location selection. - Wrong virtual host: the request’s address, port, or
Hostdoes not match the intendedlistenandserver_name. Test with an explicit host header and inspect which server is the default. - Wrong file path or 404: calculate the URI-plus-
rootpath, then check that the file exists and that the NGINX worker can traverse and read its directories.
Designing a maintainable configuration
Keep the main file focused on process-wide settings and the top-level contexts. Put shared HTTP defaults in files included from http, and put each virtual host in a clearly named file. Use comments to record why an unusual location or inheritance override exists, not to restate the directive name.
Before adding a directive, answer four questions:
- Which context does its documentation permit?
- Should the value apply globally, to one virtual server, or only to one URI pattern?
- Will a child inherit it, replace it, or merge with it?
- Could an include or a more specific location change which configuration is actually selected?
This approach keeps scope intentional, makes includes predictable, and reduces surprises when a configuration grows from one site to many.
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