If you are not able to restart apache successfully on your linux server , Please check the error with apache error logs
tail -f /usr/local/apache/log/error_log
if you are getting
pid file /usr/local/apache/logs/httpd.pid overwritten —
Unclean shutdown of previous Apache run?
semget: No space left on device
you can get it resolved with following steps:
The error specifies that there is no more [...]