11-20-2009
Quote:
Originally Posted by
mojoman
Yes it is alive and a few lines below I see:
[...]
I guess my question is why did it withdraw the IP and then suddenly rejoin?
The mDNS package (multicastDNS) thinks you're disconnecting from the network and reconnecting again. If the rest of the your network services disappear for a short time as well, then you may have an intermittent cable problem. Try swapping out the cable and see if the problem goes away.
If the rest of your network services stay up while mDNS goes down, then it's just that one service. All I can think of in that regard is some kind of autoconfiguration process that is running periodically and it causes mDNS to shutdown and then come back up. I don't know what type of service it may be that does that, though. You could try Google'ing it and see what you get. Another (rather "overkill" technique) would be to turn on system accounting and the next time you see those messages in your log file check the accounting data and determine what was running during that time period.
Yet another technique (just as much overkill as the previous) would be to run
strace -f on the mDNS service (add the timestamp option to strace; probably
-t or
-T) and then you can see what's happening inside the application by comparing timestamps with the next occurrence that appears in the log.
Warning: the strace option will create a HUGE amount of data! Especially if it takes hours or days before the entry is repeated in the log file.
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LEARN ABOUT CENTOS
vsftpd
VSFTPD(8) BSD System Manager's Manual VSFTPD(8)
NAME
vsftpd -- Very Secure FTP Daemon
SYNOPSIS
vsftpd [configuration file and / or options]
DESCRIPTION
vsftpd is the Very Secure File Transfer Protocol Daemon. The server can be launched via a ``super-server'' such as inetd(8) or xinetd(8).
Alternatively, vsftpd can be launched in standalone mode, in which case vsftpd itself will listen on the network. This latter mode is easier
to use, and recommended. It is activated by setting listen=YES in /etc/vsftpd/vsftpd.conf. Direct execution of the vsftpd binary will then
launch the FTP service ready for immediate client connections.
Systemd changes the vsftpd daemon start-up. The vsftpd package contains vsftpd-generator script generating symbolic links to /var/run/sys-
temd/generator/vsftpd.target.wants directory. The generator is called during e.g. 'systemctl --system daemon-reload'. All these symbolic
links link /usr/lib/systemd/system/vsftpd@.service file. The vsftpd daemon(s) is/are controlled by one of following ways:
1. Single daemon using default /etc/vsftpd/vsftpd.conf configuration file
# systemctl {start,stop,...} vsftpd[.service]
2. Single daemon using /etc/vsftpd/<conf-name>.conf
# systemctl {start,stop,...} vsftpd@<conf-name>[.service]
3. All instances together
# systemctl {restart,stop} vsftpd.target
See systemd.unit(5), systemd.target(5) for further details.
OPTIONS
An optional configuration file or files may be given on the command line. These files must be owned as root if running as root. Any command
line option not starting with a "-" character is treated as a config file that will be loaded. Note that config files are loaded in the
strict order that they are encountered on the command line. If no config files are specified, the default configuration file of
/etc/vsftpd/vsftpd.conf will be loaded, after all other command line options are processed.
Supported options are:
-v Print the version information and exit, even if other options are encountered.
-ooption=value
Set a single option, value pair as per the format in the config file. Multiple -o options are supported, and they are applied in
strict order relative to their appearance on the command line, including intermingling with loading of config files.
EXAMPLES
vsftpd -olisten=NO /etc/vsftpd/vsftpd.conf -oftpd_banner=blah
That example overrides vsftpd's built-in default for the "listen" option to be NO, but then loads /etc/vsftpd/vsftpd.conf which may override
that setting. Finally, the "ftpd_banner" setting is set to "blah", which overrides any default vsftpd setting and any identical setting that
was in the config file.
FILES
/etc/vsftpd/vsftpd.conf
/usr/lib/systemd/system/vsftpd.service
/usr/lib/systemd/system/vsftpd@.service
/usr/lib/systemd/system/vsftpd.target
SEE ALSO
vsftpd.conf(5) systemd.unit(5)
March 8, 2001