Drupal 7 Tutorial - Update Drupal Core to newer version - How to
Updating Drupal core tutorial. Example how I update drupal core on ytjunkie.com from 7.15 to 7.17.
Steps:
backup database and files
put site into maintanance mode
download newer core
ensure that youu are logged in as administrator
override website files with new core files except for:
robot.txt
"sites" folder
.gitignore
.htaccess
open your website update.php file from the browser
perform update
remove maintanance mode
enjoy