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Jan 082010

Apache restart explained


1. apachectl -k restart

Sending a restart signal to the Apache parent process and causes it to kill off its children, but the parent process doesn't exit. It re-reads its configuration files, re-opens any log files and continues serving users.

2. apachectl -k graceful

Similar to (1), except the the child process will exit after they have finished their current request.

3. apachectl -k stop && apachectl -k start

The Apache parent process is killed immediately and the Apache is start up again. This is the only way to cleanup cached program data (e.g. using mod_perl) stored in the Apache parent process, method (1) and (2) do not work in this case since only child process are killed.


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