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I have a number of users who are connecting to MySQL over a VPN, so we have grants along the lines of "grant select on foo.* to user@ipaddress1" and so on.

This week, the IP used on the VPN changed to address2, so user@ipaddress1 grants no longer work.

What's the best way to handle updating the user and grant information in MySQL to reflect this change?

Note that the grants are a serious mess, because some users are excluded from particular columns in particular tables, so we've had to do grants around the excluded objects.

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up vote 20 down vote accepted

Apparently, the right way to do this is:

RENAME USER user@ipaddress1 TO user@ipaddress2;

This takes care of all the grants.

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If you have a dedicated subnet for your VPN users the following syntax works well.

GRANT ALL ... user_name@'192.168.1.%'
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That doesn't help with the existing users at a specific IP. We would still have to redo all the grants, even if we're using a range the next time through. – cjc Nov 10 '11 at 21:42
You can update the existing users with the same syntax. – Tim Brigham Nov 10 '11 at 21:45

Just update the host field in your user's table:

update mysql.users set Host = newIP where Host = oldIP;
flush privileges;
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Tried that: it doesn't work if there are grants. – cjc Nov 10 '11 at 21:41
OH...good call. My bad. – jdw Nov 14 '11 at 20:30
This should work just fine, you just need to execute the flush privileges statement after you manually manipulate any of the privileges tables. – Zoredache May 5 '12 at 1:41

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