[lsb-discuss] potential lsb-apache FVT problem and /etc/services
taggart at carmen.fc.hp.com
Tue Aug 22 03:24:18 PDT 2006
On IRC liqm ran into a problem when following the FVT for lsb-apache at,
The instructions ask you to run "netstat -a | grep http". liqm was having
problem testing on Ubuntu because while the server was clearly running,
that command returned nothing.
The problem was due to the fact that netstat uses /etc/services to map port
to name, and Ubuntu (and Debian) have the following entries for web stuff,
www 80/tcp http # WorldWideWeb HTTP
www 80/udp # HyperText Transfer
https 443/tcp # http protocol over TLS/SSL
So while http works as a synomyn, since www is listed first that's what
netstat prints, so the grep doesn't work. The instructions tell you to add
http lines to /etc/services, but if they are added after the lines already
in there it won't help. Maybe something like "netstat -an |grep :80" could
be used instead?
So that lead me to wonder why Linux distributions' /etc/services weren't
standardized. At the top of Debian's /etc/services there are the following
# Updated from http://www.iana.org/assignments/port-numbers and other
# sources like http://www.freebsd.org/cgi/cvsweb.cgi/src/etc/services .
# New ports will be added on request if they have been officially assigned
# by IANA and used in the real-world or are needed by a debian package.
# If you need a huge list of used numbers please install the nmap package.
The IANA source seems canonical, but it also lists commented unassigned
ports and also comments for contact info, those probably need to be removed
for a working copy. It also only lists officially assigned ports. Does
anyone know if IANA produces a more consumable version?
What are the conflicts in Linux distros?
Is it worth making them consistant?
What are the additions in Linux distros?
Are they large enough and consistant enough to warrant a "de facto ports"
extension to the IANA list? Would there be value in such standardization?
In the past we had also talked about a need for LSB applications to be able
to register services with inetd(or xinetd) and /etc/services. But I'm not
so sure /etc/services should be updated, maybe it's best if it's just the
Matt Taggart Open Source & Linux Organization R&D
taggart at fc.hp.com Hewlett-Packard
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