#1  
Old 18th August 2009, 19:26
moglia moglia is offline
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Exclamation MYDNS problems.

Queryes from opendns works but some dns servers from another isp on brazil fail and not resolving some domains on my ispconfig machine.

some times fail and i modified my.cnf to make more effective mysql configurations based on study of actual mysql server loading.

Can be a dns time of isp cache?

Some times querys not working or slow (from specific isp). i suposed it´s a mysql issue and make some tunning on mysql configurations to improve mysql performance.

Im logging name resolution on log file.

and modified init script to make output verbose to looking for any error menssage.

mydns[5284]: mydns: 18-Aug-2009 14:20:38+360462 #2107 30965 UDP 200.175.5.243 IN A www.domain.org. NOERROR - 1 2 2 5 LOG Y QUERY ""

aways or most time NOERROR output.

host comand output on some dns servers from brazilian isp.
------------------------------------------------------------
devsrv:~# host webmail.clientdomain.com.br
webmail.clientdomain.com.br is an alias for webmail.serverdomain.com.
webmail.serverdomain.com is an alias for delta.serverdomain.com.
delta.interatia.com has address 72.232.246.59
;; connection timed out; no servers could be reached
;; connection timed out; no servers could be reached
------------------------------------------------------------

Direct queryes to mydns for own domains using host command aways works.

i will try change
timeout = 120 # Number of seconds after which queries time out

giveing more time to time out. 4 minutes for example.

Anybody have any sugestions or pass for the same or similar problem?

Regards.
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Old 19th August 2009, 09:49
till till is offline
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Enable caching in mydns:

http://mydns.bboy.net/doc/html/mydns_16.html

Never seen that but I dont think its a mysql problem as the queries from mydns are very lightweight and dont cause much load.
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  #3  
Old 19th August 2009, 11:14
moglia moglia is offline
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Exclamation Cache is enabled by default.

delta:~# cat /etc/mydns.conf | grep cache
zone-cache-size = 2048 # Maximum number of elements stored in the zone cache
zone-cache-expire = 60 # Number of seconds after which cached zones expires
reply-cache-size = 2048 # Maximum number of elements stored in the reply cache
reply-cache-expire = 30 # Number of seconds after which cached replies expire
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Old 21st August 2009, 08:24
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Default no resolution

anyone got a fix for it?
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Old 21st August 2009, 13:41
till till is offline
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What fix? MyDNS is working fine even on large systems. How many thousand domains do you run on this server that you reach any limits.
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  #6  
Old 21st August 2009, 14:38
moglia moglia is offline
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Exclamation share experience.

i have 66 domains inside. share your experience and configurations whats version you using. You use A or CNAME, database tunning or other things.

Mysql status:

MAX CONNECTIONS
Current max_connections = 64
Current threads_connected = 16
Historic max_used_connections = 53
The number of used connections is 82% of the configured maximum.
Your max_connections variable seems to be fine.

And special information im not using any site inside only mail and dns. I can imagine put some sites with database access inside.

See:
http://www.howtoforge.com/forums/sho...9&goto=newpost
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Old 21st August 2009, 14:42
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Two thread about the same issue. Closed this thread.
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