Red Hat

Hi ,

If i start mysqld or httpd as root user which inturn starts them as "mysql" or "apache" user, will the ulimit of "root" user or ulimit of "mysql/apache" user be set for the mysql/apache processes.

My understanding is that the ulimit of the user who initiates the process(root in this case) will get inherited.Is my understanding correct?
Similarly if i am invoking these apps in a separate shell, will the env variables of the user in that shell get superceeded by the process initiator.

Am a little confused. Any help/links is appreciated.

Thanks
HG

Check out the POSIX exec family of functions man page. This will tell you what is inherited by the new process image after an exec.

Note that if the mysqld and httpd daemons are running as root (or on privilege aware systems; running with all privileges) they are perfectly capable of changing anything that will be inherited by the new process image between the time it fork()s and the time it calls an exec family function so that mysql or apache will run with whatever user-id, group-id, and process limits that the daemon thinks they should have.

Yes, the fork of a process also copies the environment including the limits.
In Linux you can peek the limits by

Code:

cat proc/<pid>/limits