Installapache2-utilsorhttpd-toolstousehtpasswd.2.Createasecurepasswordfilewithsudohtpasswd-c/etc/nginx/.htpasswdusername.3.ConfigureNginxbyaddingauth_basicandauth_basic_user_filedirectivesinthedesiredlocationblock.4.Testconfigurationwithsudonginx-tan

NginxSSL termination means that Nginx decrypts traffic after receiving a client HTTPS request and forwards the decrypted HTTP request to the backend server. 1.Nginx serves as a reverse proxy, receives encryption requests on port 443, and uses SSL certificates and private keys to decrypt data. 2. After decryption, Nginx forwards the request to the backend service via HTTP or internal HTTPS. 3. The backend response is returned by Nginx and re-encrypted if necessary. Advantages include: improving performance, offloading CPU-consuming decryption tasks from the backend to efficiently process connections; centrally managing certificates to simplify update processes; enhancing flexibility, supporting enabling HTTP/2, compression, caching and load balancing on decrypted traffic; simplifying backend configuration

proxy_passforwardsclientrequeststobackendservers,enablingNginxtoactasareverseproxy;ithandlesdynamiccontentbydelegatingtoapplicationserverslikeNode.jsorPython,supportsloadbalancingviaupstreamblocks,enhancessecurityandperformancewithheadermanipulationa

Nginx cache clearing needs to be operated according to the configuration method, because there is no built-in clear command. 1. For disk proxy cache, find the path specified by proxy_cache_path (such as /var/cache/nginx), delete the file below and restart Nginx. 2. If the cache clearing function is enabled, you can configure location~/purge to clear a specified URL, such as curl-XPURGE to clear a single page. 3. When using FastCGI cache, clear the directory file corresponding to fastcgi_cache_path and restart the service. 4. After clearing, you can use curl-I to check the response header X-Cache: MISS to confirm that the cache has expired. The core is matching configuration

Nginx variables start with $ and are used to dynamically store and reuse values. They can be defined through set directives, such as set$env "production"; they support built-in variables such as $request_uri, $host, etc. for logging and conditional judgment; variable-based redirection and URL rewriting can be achieved in combination with if and rewrite; but variables are only valid in server and location, and some instructions do not support variables.

ThemainNginxconfigurationfileisusuallyat/etc/nginx/nginx.conf;commonalternativesinclude/usr/local/nginx/conf/nginx.confand/opt/nginx/conf/nginx.conf,withsite-specificfilesin/etc/nginx/sites-available/and/etc/nginx/sites-enabled/,or/etc/nginx/conf.d/o

TodeployaReactapponNginx,servestaticfilesandconfigureroutingfallbacktoindex.html.First,buildtheappusingnpmrunbuild,thentransferthebuildfilestotheserverdirectory(e.g.,/var/www/my-react-app).Next,createanNginxserverblockpointingtothisdirectory,usingtry

Answer: Nginx health check depends on the version. The open source version supports passive checking, which is implemented through max_fails and fail_timeout, such as blocking for 30 seconds after three failures; NginxPlus supports active checking, using the health_check instruction to send requests every 5 seconds, verify status codes and response content, and can monitor the backend status through the API.