Thach Tran created TS-2595:
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Summary: DNS lookup failed with multiple search domains
Key: TS-2595
URL: https://issues.apache.org/jira/browse/TS-2595
Project: Traffic Server
Issue Type: Bug
Components: DNS
Reporter: Thach Tran
Attachments: ats_bad_dns.log
I find the DNS search domain expanding logic of ATS a bit strange. On a system
with multiple search domains in /etc/resolv.conf such as
{noformat}
search cisco.com google.com
{noformat}
and proxy.config.dns.search_default_domains set to 1, if ATS tries to lookup a
hostname say 'developers', it will expand it to 'developers.cisco.com' first
and then 'developers.cisco.com.google.com'. In other words, the next search
domain will just get appended to the already expanded name. In this instance,
it will end up failing as both 'developers.cisco.com' and
'developers.cisco.com.google.com' are not resolvable.
I would expect ATS to lookup 'developers.cisco.com' first and then try
'developers.google.com' which will success.
I have a quick look at the code and it seems like it has been that way since
Oct 2009 at least. Could someone comment on whether this is intentional or it's
actually a bug. I find most other dns clients (e.g., nslookup) append search
domain in turn to the original name rather than work this way.
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