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MySQL User / Host Table Questions

Posted on 2006-10-23
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Last Modified: 2008-01-09
1.) Should I have to restart MySQL every time I change the “user” table?  (Windows 2003, MySQL 5.0)  It seems I have to for the changes to take effect.

2.) What about using a subnet or wildcard in the host column?  I’ve been unsuccessful with using 192.168.1.*

3.) How do I grant a user access from multiple hosts?  Do I put all hosts into the Host field, like “localhost,192.168.1.100”?  Do I have to create a new user row for every user / host combination I want to allow?  This seems counter productive to me because now I have multiple users with the same names, and potentially different passwords.

Thanks for the help and pointers here.
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Question by:rebies
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Raynard7 earned 500 total points
ID: 17792641
1. -> no - you can use the command
mysql flush privileges;
for the changes to take effect
2. use the % sign as the wild card rather than *
3. you have to create a new row for each host that you want them to connect to.  But generally you would only give them say access from localhost, access from the lan (based on your ip prefix) and all other access % which should not be too difficult.
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by:rebies
ID: 17792680
thanks for the quick reply Raynard7!  So is it unadvisable to give a user a pure "%" access?  Usually I'll want only home, work, and LAN connections for each user.  (Thus, best security says 3 rows for each user - right)
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by:rebies
ID: 17792732
1.) flush privileges:  great - works!

2.) % sign:  great - works!

3.) will need to test a little bit on this one.
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by:Raynard7
ID: 17792754
Hi,

This all depends on your security model.

On most of my machines I have only localhost priv's for my users.

This is because they use business objects to query the database or are using it through a web front end - where they do not need remote use.

For other users who have access to everything I just grant all priviledges from all hosts.

Generally - the "default" user access model would be as I described above - select from % - some access from LAN and some more access from localhost (if applicable)
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by:Raynard7
ID: 17792758
Normally you would not give access for say dropping tables from % or from the lan but you may want someone who is trusted to have access to local host to be able to execute that function... as an example
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by:rebies
ID: 17792812
Thanks.   So if I want "myself" to be a user that is allowed on localhost and on the LAN - I have to create two completely seperate users - right?


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by:Raynard7
ID: 17792853
if you want yourself to be on the lan - and on localhost but not from anywhere else you would need to use two lines in the user table.

You could also do

Grant all on % to myself@localhost;
Grant all on % to myself@192.168.0.%;

which would have the same effect
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by:rebies
ID: 17792897
Thanks much Raynard!  You've definately more than answered my questions!
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by:Raynard7
ID: 17792929
glad I could help
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