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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LEARN ABOUT CENTOS
reposync
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)