Hi Rich, all, Nothing is jumping out at me. Do you have the access log and threddsServlet.log files for the time period when the DNS requests were being generated? The only /tmp file listed below that looks legit (i.e., likely produced by the TDS) is the hsperfdata_tomcat/ directory (more below ). The only other one that seems like it might be OK is the httpdlog file. But even that seems a bit odd unless you are running an Apache server as the tomcat user. Is the tomcat user only used to run Tomcat instances running TDS?  The hsperfdata_tomcat/ directory is the only one from the file listing below that we have on our main server. It, according to , is created by Java and used to allow/improve monitoring capabilities with jconsole and the like.  http://stackoverflow.com/questions/76327/how-can-i-prevent-java-from-creating-hsperfdata-files > Thredds guys, > > UMASS shutdown their production tomcat/thredds and disabled the tomcat > user on Saturday, which of course is causing an interuption in ocean > forecast products in New England used by the US Coast Guard, US IOOS > and the local Weather Service Offices. > > Here is there message about why they shut it down. > > Any ideas about what was happening and how to get this back up and running? > > From Kent Gardner at UMASSD: > > It appears that the SMAST host system that is running Thredds was > generating a storm of DNS requests to our campus name server. When > Mike shut Thredds down and disabled the tomcat account the storm > stopped. > > I can think of no legitimate reason why Thredds would be doing this. > The only thing that remotely comes to mind would be someone trying to > look up IP numbers in a log file to get the host name for > informational purposes. Has anyone come across this behavior before in > Thredds/Tomcat? > > Also looking in /tmp we see the following: > > ls -al /tmp|grep tomcat > > drwxr-xr-x 2 tomcat tomcat 4096 Apr 15 19:42 adiandian > > -rwxr-xr-x 1 tomcat tomcat 5 Apr 18 13:11 bill.lock > > drwxr-xr-x 3 tomcat tomcat 4096 Apr 11 14:32 dEDVea > > drwxr-xr-x 3 tomcat tomcat 4096 Apr 14 10:30 dvcdNo > > drwxr-xr-x 3 tomcat tomcat 4096 Apr 8 09:35 fkuQAx > > -rwxr-xr-x 1 tomcat tomcat 5 Apr 18 13:11 gates.lock > > drwxr-xr-x 2 tomcat tomcat 4096 Apr 18 21:52 > hsperfdata_tomcat > > drwxr-xr-x 2 tomcat tomcat 4096 Mar 28 23:59 httpdlog > > --wx--Sr-- 1 tomcat tomcat 51 Apr 16 11:46 notify.file > > > I do not know of any files that Thredds/Tomcat would put in /tmp. Does > anyone know if any of these files are legitimate? > > As far a game plan goes I will need to confer with Mike. At the very > least we need to scan for and delete all suspicious files, and change > the password on the tomcat account. After that we start things up and > monitor the network traffic. " > > Thanks, > Rich > > -- > Dr. Richard P. Signell Ticket Details =================== Ticket ID: IXX-362335 Department: Support THREDDS Priority: Normal Status: Open
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