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Operating Systems Linux Red Hat Kernel thinks tcp port in use but isnt Post 302591440 by skkool22 on Thursday 19th of January 2012 12:58:39 PM
Old 01-19-2012
a colleague of mine used system tap to track the inet_csk_bind_conflict function and found that "nscd" process was the one hanging on to the tcp port.

this is what the system tap trace looked like:

inet_bind(nc): socket [state 1 type 1] uaddr 0.0.0.0:23426 addr_len 16
tcp_v4_get_port(nc): sock [reuse 1 state 7] snum 33371
bind_conflict(nc): sock [reuse 1 state 7] tb [port 33371 fastreuse 0 (reuse 0 state 7 owner (pid 0 uid 0 euid 0) uid 28 gid 28)]
bind_conflict: return 1 (EPERM)
tcp_v4_get_port: return 1 (EPERM)
inet_bind: return -98 (EADDRINUSE)

$ getent passwd 28
nscd:x:28:28:NSCD Daemon:/:/sbin/nologin

Restarting nscd freed up the port.

Anyway, 2 morals to the story:
1) I have some wicked smart colleagues.
2) when in doubt, restart nscd!
 

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reposync(1)															       reposync(1)

NAME
reposync - synchronize yum repositories to a local directory SYNOPSIS
reposync [options] DESCRIPTION
reposync is used to synchronize a remote yum repository to a local directory, using yum to retrieve the packages. OPTIONS
-h, --help Display a help message, and then quit. -c CONFIG, --config=CONFIG Config file to use (defaults to /etc/yum.conf). -a ARCH, --arch=ARCH Act as if running the specified arch (default: current arch, note: does not override $releasever. x86_64 is a superset for i*86.). --source Also download .src.rpm files. -r REPOID, --repoid=REPOID Specify repo ids to query, can be specified multiple times (default is all enabled). -t, --tempcache Use a temp dir for storing/accessing yum-cache. -p DESTDIR, --download_path=DESTDIR Path to download packages to: defaults to current directory. -g, --gpgcheck Remove packages that fail GPG signature checking after downloading. exit status is '1' if at least one package was removed. -u, --urls Just list urls of what would be downloaded, don't download. -l, --plugins Enable yum plugin support. -n, --newest-only Download only newest packages per-repo. -q, --quiet Output as little information as possible. EXAMPLES
Sync all packages from the 'updates' repo to the current directory: reposync --repoid=updates Sync only the newest packages from the 'updates' repo to the current directory: reposync -n --repoid=updates Sync packages from the 'updates' and 'extras' repos to the current directory: reposync --repoid=updates --repoid=extras Sync all packages from the 'updates' repo to the repos directory: reposync -p repos --repoid=updates Sync all packages from the 'updates' repo to the repos directory excluding x86_64 arch. Edit /etc/yum.conf adding option exclude=*.x86_64. Then: reposync -p repos --repoid=updates FILES
reposync uses the yum libraries for retrieving information and packages. If no configuration file is specified, the default yum configura- tion will be used. /etc/yum.conf /etc/yum/repos.d/ SEE ALSO
yum.conf (5) http://yum.baseurl.org/ AUTHORS
See the Authors file included with this program. BUGS
There are of course no bugs, but should you find any, you should first consult the FAQ section on http://yum.baseurl.org/wiki/Faq and if unsuccessful in finding a resolution contact the mailing list: yum-devel@lists.baseurl.org. To file a bug use http://bugzilla.redhat.com for Fedora/RHEL/Centos related bugs and http://yum.baseurl.org/report for all other bugs. 27 April 2007 reposync(1)
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