>> хинт - включите логирование sql запросов и вы увидите что именно
>> запрашивает Ваш DNS сервер у базы данных.
> Вот за это спасибо, дело было в базе.
>> Хинт2. смотрите Ваш /etc/resolv.conf на предмет опции search и её значения
> Я думаю что /etc/resolv.conf тут ни при чем, я же указываю @localhost,
> т.е. нарямую спрашиваю конкретный сервер.А речь не про то у кого Вы спрашиваете,а про то, что именно спрашиваете.
man resolv.conf /search
search Search list for host-name lookup.
The search list is normally determined from the local domain name; by default, it contains only the local domain name. This may be changed by listing the desired
domain search path following the search keyword with spaces or tabs separating the names. Resolver queries having fewer than ndots dots (default is 1) in them
will be attempted using each component of the search path in turn until a match is found. For environments with multiple subdomains please read options ndots:n
below to avoid man-in-the-middle attacks and unnecessary traffic for the root-dns-servers. Note that this process may be slow and will generate a lot of network
traffic if the servers for the listed domains are not local, and that queries will time out if no server is available for one of the domains.
The search list is currently limited to six domains with a total of 256 characters.
....
The domain and search keywords are mutually exclusive. If more than one instance of these keywords is present, the last instance wins.
The search keyword of a system's resolv.conf file can be overridden on a per-process basis by setting the environment variable LOCALDOMAIN to a space-separated list of
search domains.
The options keyword of a system's resolv.conf file can be amended on a per-process basis by setting the environment variable RES_OPTIONS to a space-separated list of
resolver options as explained above under options
