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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
>From: Gilbert Sebenste <sebenste@xxxxxxxxxxxxxxxxxxxxx> >Organization: NIU >Keywords: 200104280154.f3S1sSL24870 McIDAS ADDE RedHat 7.1 Linux inetd xinetd Gilbert, et. al., I am not writing to jump into the Solaris vs Linux debate (although I think that Solaris x86 runs much better than Linux, but I run Linux at home :-), I am writing to make a small comment on McIDAS ADDE functionality under RedHat 7.1 Linux. Gilbert noted: ... >BTW, McIDAS under 7.1 works >fine, except my ADDE server suddenly stopped working from those people >trying to get data from me. I think it's back up again...will check. The problem that Gilbert ran into was caused by the upgrade from RedHat 6.2 Linux to 7.1. The story is as follows: o RedHat 6.x Linux runs inetd, and inetd is configured with /etc/inetd.conf o RedHat 7.x Linux no longer runs inetd. Instead, it runs xinetd, and xinetd uses a different approach to configuration: files in the /etc/xinetd.d directory o RedHat 7.x Linux includes an executable called inetdconvert (a Python script) that converts /etc/inetd.conf entries to files in /etc/xinetd.d o newer versions of Linux (and FreeBSD) include what looks like all registered uses of port numbers in /etc/services. Port 500 (both TCP and UDP) is registered to a program called 'isakmp'. o McIDAS ADDE uses ports 500 and 503 for communications: port 500 for uncompressed transfers and port 503 for compressed transfers All of this sounds reasonably OK until one realizes that there is a port conflict between McIDAS ADDE uncompressed data transfers and 'isakmp'. This is easily gotten around by commenting out the 'isakmp' entries in /etc/services and sending a USR1 signal (not a HUP) to xinetd. The problem, however, is that inetdconvert does NOT convert the /etc/inetd.conf entries for ADDE services (mcserv and mccompress) correctly. The /etc/services entries for mcserv (port 500) and mccompress (port 503) get deleted in the upgrade from RedHat 6.x to 7.x, AND the configuration files created in /etc/xinetd.d for those services do NOT include the port configuration information that would obviate the need for an entry in /etc/services. The solution that returns ADDE functionality is the addition of a port definition line to the /etc/xinetd.d/mcserv and /etc/xinetd.d/mccompress files followed by the sending of a USR1 signal to xinetd (which tells it to reread its configuration files). After these steps were performed on Gilbert's machine, ADDE returned to functionality. I will be updating the Linux section of the Unidata McIDAS 'Notes and Warnings" web page: http://www.unidata.ucar.edu/packages/mcidas/770/mcx/warnings_mcx.html with the steps needed to recover from the RH 6.x to 7.x upgrade later this weekend. Tom -- +-----------------------------------------------------------------------------+ * Tom Yoksas UCAR Unidata Program * * (303) 497-8642 (last resort) P.O. Box 3000 * * yoksas@xxxxxxxxxxxxxxxx Boulder, CO 80307 * * Unidata WWW Service http://www.unidata.ucar.edu/* +-----------------------------------------------------------------------------+
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