[Pdns-users] Crappy DNS query make Mysql/Pdns crash
pdns at vava.org
Mon Mar 29 16:04:23 UTC 2004
I have noticed for some time now that my pdns server occasionnaly
crash just after breaking 10000 query-queue limit.
After investigating, I have noticed that query with
'%20' caracters leads to a LIKE query to MySQL thats really kicks it out
and leads to pdns restarting when breaking 10000 q in query-queue.
After reading documentation, it seems that LIKE query should only be used
in case of fancy-records activated.
But in the backend code ANY '%' inside leads to a SQL LIKE query
which is really heavy for a loaded MySQL server.
So why theses queries are just issued without any LIKE instruction
as Fancyrecords are not activated.
By the way, in my log '%20toto.mydomain.com' query is just
"discarded as malformed qdomain '%20toto.mydomain.com' dropping"
But a 'www.%20toto.mydomain.com' query leads to a
select content,ttl,prio,type,domain_id,name from records where type='NS'
and name like '%20toto.mydomain.com' and domain_id='1'
and lock the MySQL server for some time which can be fatal for my
Any idea to prevent this problem are welcomed.
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