nginx 502 Bad Gateway A website stopped opening in the browser and "nginx 502 Bad Gateway" error was displayed. The solution to the error is provided. Continue Reading
MCE hardware error cpu 0 Mce hardware error was observed on a Linux system. The steps for resolution of "mce hardware error" are provided. Continue ReadingFailed to fetch webpage, temporary failure resolving domain An error, "Temporary failure resolving domain" was observed while executing commands. Steps required to resolve the error are listed. Continue Reading
Composer Manager: Composer’s install command must be run Resolution of a Composer Manager error, Composer's install command was required to be run in a Drupal 7 website. Continue Reading
Drupal: Trying to get property of non-object in block_block_view Resolution of the error Notice: Trying to get property of non-object in block_block_view() in a Drupal 7 based website. Continue Reading
Dovecot: Error in configuration file, Unknown protocol: sieve Resolution of an error in the Dovecot configuration file regarding the unknown protocol sieve is explained. Continue Reading
How to execute PHP code in HTML under nginx server PHP was not executing inside an HTML file. Step by step procedure for executing PHP in HTML using the nginx web server. Continue Reading
SSL Certificate expired, site not opening A website was not opening in the browser as its SSL certificate had expired. Steps required to resolve the problem are given. Continue Reading
How to preserve exif metadata in images in Linux Some programs do not write the Exif metadata on the output file. Using exiftool command, the metadata can be transferred to the output file. Continue Reading
How to add IPTC metadata in photographs using exiv2 in Linux IPTC metadata can be added to an image using the exiv2 command in Linux. How to add IPTC metadata in image files is explained. Continue Reading
How to get the value of Pi in bc calculations Quite often, the value of Pi is required in calculations. The steps for calculating the value of Pi and using it in bc is explained. Continue ReadingError while executing the dig command While running the dig command, "sendmsg failed: operation not permitted" error were observed. Steps taken for resolution of errors are given. Continue Reading
Analyzing the NGINX web server log file A Perl script for generating the report of the most frequent visitors to a website from the nginx log file is given. Continue Reading
Android adb install failure INSTALL_PARSE_FAILED_NO_CERTIFICATES The download of an Android app with the adb gave the error INSTALL_PARSE_FAILED_NO_CERTIFICATES. Steps for resolving the error are given. Continue Reading
nginx drupal sitemap 404 not found Resolution of a 404 Not Found error for sitemap of a website built using Drupal CMS and served by nginx webserver. Continue Reading