MYDNS problems.

Discussion in 'Installation/Configuration' started by moglia, Aug 18, 2009.

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  1. moglia

    moglia New Member

    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 IN A 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 is an alias for is an alias for has address
    ;; 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?

  2. till

    till Super Moderator

  3. moglia

    moglia New Member

    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
  4. all

    all New Member

    no resolution

    anyone got a fix for it?
  5. till

    till Super Moderator

    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.
  6. moglia

    moglia New Member

    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:

    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.

  7. till

    till Super Moderator

    Two thread about the same issue. Closed this thread.
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