On 12/26/2012 01:25 PM, Igor Shevtsov wrote:
You mysql.user table might be corrupted.
If you have access to it as a root user, try check table mysql.user, and
repair table mysql.user if table corruption was detected.
Alternatively, shut down mysql server, cd /var/lib/mysql/mysql (to your
$datadir/mysql directory) and run
mysqlcheck -r mysql user
I deleted the row with the empty user from mysql.user, then restarted the
daemon, and all seems back to normal now.
One lingering question is: why did mysql allow this to happen? Could this be
considered a bug? After all, an inadvertent and seemingly harmless insertion
leads to authentication failure for all users.
Are there any other known similar gotchas? The fix for this one appears so
trivial as to perhaps NOT call for a restore-from-backup. But there could be
other similar glitches that might call for that?
Thanks!
On 26/12/12 18:00, Round Square wrote:
Hi all:
Suddenly, after a long, functioning run of the mysql server, all the
non-root accounts went bad, with:
Access denied for user 'non_root_user'@'localhost' (using
password: YES)
Authenticating with non_root_u...@server.ip.address still works ( the
bind-address in my.cnf is mapped to server.ip.address )
Poking around in puzzlement and comparing the current, broken state with the
functioning state (from backup) I discovered that in the broken version
there is this extra line in the information_schema.USER_PRIVILEGES table:
| ''@'localhost' | NULL | USAGE
| NO |
(Note the null-string user prepended to @localhost)
Again: the functional, non-broken state does NOT have this entry. Thus, my
current theory is that this line is the culprit. Prior to the failure I had
a surge of experimental installations, installing third-party software that
created mysql tables, and can't clearly retrace everything I did, at this
point, to pinpoint the installation that may have caused it.
Be that as it may...
(1) Is my theory correct?
(2) If that line should not be there...
(a) How do I remove it, properly? I don't have debian-sys-maint
privileges to delete the line. (Or do I?)
(b) Are there other tables, besides USER_PRIVILEGES, that would need
to be updated/purged
My version:
mysql Ver 14.14 Distrib 5.1.41, for debian-linux-gnu (i486) using readline
6.1
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