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A lot of times I will get a URL for an application that has some sort of problem. In order to fix it I need to find out what server it's running on which usually involves running around and asking a few people. Is there some way that I can look this up from the command line? I tried NSLOOKUP but I think it only gives me the name server.

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What type of application? What exactly are you asking 'a few people'(who?) to find out which server app has the issue? – l0c0b0x Feb 8 '11 at 16:14
Doesn't a URL by definition have the (domain) name of the server already?? – Chris S Feb 8 '11 at 16:18
@10, it's a web application. I'm asking people who have knowledge of the application or network structure the following question, "Hey, what server is application-x running on". – Abe Miessler Feb 8 '11 at 16:36
@Chris - far from it. The front-end web server could be calling application logic anywhere - it could be a reverse-proxy Apache for tomcat on the same or a different machine, it could be calling a stored-procedure on a SQL box that is misbehaving, etc. Just because you know where the valet stand is doesn't mean you have any idea where your car is coming back from. – mfinni Feb 8 '11 at 18:21
up vote 7 down vote accepted

The URL will often indicate where an application is running, e.g. "" is running on "app01", but if your servers are load-balanced that may not be the case.

In cases where the URL isn't revealing you may get lucky and have your system designed in such a way that it discloses which server an application is running on (HTTP headers, <META> tags in the output, a status message sent to a client, etc.), otherwie you're pretty much down to asking around and compiling documentation as to which servers do what.

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+1 DOCUMENTATION! – Chris S Feb 8 '11 at 16:24
Yes! Unless your team/company/entity/institution/club has a standard naming policy or something, there's no way for you to know without documentation. – daveadams Feb 8 '11 at 19:01

Find it in your CMDB :-)

It is the best general answer. If your response is "What's that?" or "We don't have one", it's time to start building it - as voretaq7 said. If the answers are all only in other people's heads, start writing their answers down.

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