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I have an mdadm-RAID and want to get notified about events, for example a failing HDD. I can use MAILADDR and PROGRAM in the mdadm config file to achieve this. I decided to use the latter. So I wrote a simple notification bash-script and set the PROGRAM-option to the script's path.

To avoid that each and every user can use this script to send notifications only the root-user has the execute-right on that script. So when mdadm wants to send a notification it must run the script as root.

However I cannot find any option to set the user. Is it always root by default?

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AFAIK it will run as root, as long as mdadm --monitor is being run as root (which is the normal case).

I found the MAILADDR option in mdadm.conf more flexible in this respect. On my server any email is sent to a specially created user, for which an entry in .procmailrc does execute a program with that user as owner. That program is located in a directory not accessible by any other (normal) users (it sends a notification from my server to my desktop on my work machine, in addition to forwarding the email).

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