title: Failed to restart php-fpm.service: Unit php-fpm.service not found
body: <p>My site showing error 502 Bad Gateway . on checking error log file i found error -<br>
  <strong>connect() to unix:/var/run/php-fpm.sock failed (2: No such file or directory) while connecting to upstream, client</strong></p>
  
  <p>how can i fixed this issue ?</p>