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On Linux systems, apache runs as the www-data (default) user, and its user group is also www-data.

But I found that the apache log directory /var/log/apache belongs to root, and the group is adm

www-data does not have write permissions on the log directory, and it is not a user of the adm group and does not even have read permissions.

But we found that there is an apache2 process running as root, which should be the main process. Are the logs of all child processes first passed to the main process through process communication and then recorded? Or is there some other mechanism?