Mellanox ConnectX errors “Could not join netdev: No space left on device”

Once after installing the Mellanox ConnectX-3 Pro EN / HP 544+QSFP (764284-B21) network adapter into the HPE DL380 Gen10 server, I encountered errors in the /var/log/syslog file:

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ABillS. Problem with payments between 00:00 and 01:00

In 2018, I ran into a problem when the user ran out of money on the account, at midnight he turned off the billing, the user immediately made a payment, the money was debited and the service turned on, and at 1 am it was turned off again, because the billing system tried to withdraw the monthly fee again. I’ll just post a simple script here that allows you to receive email notifications with a list of users who made a payment at night between 00:00 and 01:01, so that later you can manually correct it.

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