How to enable url rewriting in apache

To check the Apache service status, the most common method is to use the systemctlstatusapache2 or systemctlstatushttpd command, depending on the service name used by the system. If the service is running normally, active (running) will be displayed. If it is not started or failed, inactive or failed. When encountering a failed state, you can view the error prompts of systemctl output and combine journalctl-uapache2.service--since"1hourago" to get detailed logs. Common problems include configuration file syntax errors.

The 404 error usually means that the server cannot find the requested file. Common reasons include files being moved or renamed, URL path misspelled, file permission restrictions, file missing, etc. Checking methods include checking the specific path in the log, confirming whether the file exists, checking the spelling of the file name, directly accessing the file link in the browser, and adjusting the file permissions to 644 or 755. Sometimes it is not a serious problem, such as invalid paths for crawler requests, old cache loading expired resources, local test missing files, etc. do not need to be fixed immediately. Find and correct the specific file path that caused the error to solve the problem.

Apache can effectively handle Node.js or Tomcat application requests as a reverse proxy server. 1. First enable mod_proxy, mod_proxy_http and mod_ssl modules and restart the service; 2. Configure the virtual host to forward the request to the Node.js application running on port 3000; 3. For Tomcat applications, configure the ProxyPass and ProxyPassReverse rules to point to port 8080; 4. Optionally add SSL support, configure the certificate path and open the firewall rules. After all steps are completed, make sure to check logs for common problems such as permissions or path errors.

Apache can achieve load balancing by enabling mod_proxy and mod_proxy_balancer modules. 1. Enable modules: including mod_proxy, mod_proxy_http, mod_proxy_balancer and mod_lbmethod_byrequests; 2. Configure virtual host files, use BalancerMember to define back-end servers, ProxySet sets load algorithms, ProxyPass and ProxyPassReverse forwarding requests; 3. Optional configurations include setting weights, health checks, session hold and timeout control; 4. Finally test and reload Apache

The default validity period of Let'sEncrypt certificate is 90 days, but it can be automatically renewed through configuration. 1. Using Certbot is an official recommended practice, with built-in automatic renewal function; 2. Mainstream Linux distributions such as Ubuntu and CentOS have pre-set tasks, the former uses systemdtimer, and the latter uses cron or systemd; 3. You can run systemdlist-timers or check /etc/cron.d/ to confirm whether the task exists; 4. It is recommended to manually execute the certbotrenew-dry-run test process; 5. If you use certbot-apache or certbot-nginx plug-in, renew your signature.

To view Apache logs in real time, it can be mainly achieved through command line tools. 1. Use tail-f to track new contents in real time for log files, such as: tail-f/var/log/apache2/access.log; 2. If you need to read the history and monitor new content at the same time, you can use less F. After entering, press Shift F to track in real time, and Ctrl C pauses and turn pages; 3. If you need to view multiple logs in split screen and highlight keywords, you can install the multitail tool for visual monitoring. The three methods are applicable to different scenarios and can be flexibly selected according to actual needs.

Your CGI script is not executed may be due to file permissions, server configuration, or script format issues. 1. Check file permissions to ensure that the script and directory permissions are 755 and the ownership is correct, and avoid using 777 permissions. 2. Confirm that the script is located in the directory where the server allows CGI execution, such as cgi-bin, and check whether the server configuration enables CGI support and correctly sets the Options and AddHandler instructions. 3. Make sure that the script outputs the correct HTTP header information. The content type must be printed before any output without any blank lines. At the same time, save the script using Unix newlines. 4. Check that the first line of the script shebang points to the correct interpreter path, you can use the which command to confirm or use more general

An.htaccessfileisaconfigurationfileusedbyApachewebserverstomakeserver-levelchangeswithoutaccessingmainconfigurationfiles.Itworksbyapplyingrulestothedirectoryit’splacedinandallsubdirectories,takingeffectimmediatelyuponaccess.Commonusesincluderedirects