01-17-2020
One of the two DNS server going down causes impacts
Our computing enviornment consists for Linux, Solaris , AIX, Windows. /etc/resolv.conf file of each *nix has two entries. When the 2nd one goes down we are seeing impacts on AIX hosted services. We are breaking our head, to no avail yet. We have not seen any impact on non-AIX hosted services. While 2nd DNS server remains down, nslookup returns hostnames immediately.
We are trying to avoid running tcpdump, and was trying to capture DNS traffic from client through netstat. But netstat does not capture DNS traffic either.
Would you please give us a hand?
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LEARN ABOUT XFREE86
avahi-daemon
avahi-daemon(8) System Manager's Manual avahi-daemon(8)
NAME
avahi-daemon - The Avahi mDNS/DNS-SD daemon
SYNOPSIS
avahi-daemon [options]
avahi-daemon --kill
avahi-daemon --reload
avahi-daemon --check
DESCRIPTION
The Avahi mDNS/DNS-SD daemon implements Apple's Zeroconf architecture (also known as "Rendezvous" or "Bonjour"). The daemon registers local
IP addresses and static services using mDNS/DNS-SD and provides two IPC APIs for local programs to make use of the mDNS record cache the
avahi-daemon maintains. First there is the so called "simple protocol" which is used exclusively by avahi-dnsconfd (a daemon which config-
ures unicast DNS servers using server info published via mDNS) and nss-mdns (a libc NSS plugin, providing name resolution via mDNS).
Finally there is the D-Bus interface which provides a rich object oriented interface to D-Bus enabled applications.
Upon startup avahi-daemon interprets its configuration file /etc/avahi/avahi-daemon.conf and reads XML fragments from /etc/avahi/ser-
vices/*.service which may define static DNS-SD services. If you enable publish-resolv-conf-dns-servers in avahi-daemon.conf the file
/etc/resolv.conf will be read, too.
OPTIONS
-f | --file= FILE
Specify the configuration file to read. (default: /etc/avahi/avahi-daemon.conf)
-D | --daemonize
Daemonize after startup. Implies --syslog.
-s | --syslog
Log to syslog instead of STDERR. Implied by --daemonize.
--debug
Increase verbosity to debug level.
--no-rlimits
Don't enforce resource limits as specified in the configuration file. (See setrlimit(2) for more information)
--no-drop-root
Don't drop root privileges after startup and don't require daemon to be started as root. We recommend not to use this option.
--no-chroot
Don't chroot(2) the daemon. This option is only available when compiled with chroot() support.
--no-proc-title
Don't change the process name while running. Unless this option is specified avahi-daemon will reflect its current state and the
selected host name in the process title.
-k | --kill
Kill an already running avahi-daemon. (equivalent to sending a SIGTERM)
-r | --reload
Tell an already running avahi-daemon to reread /etc/resolv.conf (in case you enabled publish-resolv-conf-dns-servers in avahi-dae-
mon.conf) the files from /etc/avahi/services/. Please note that this will not reload the /etc/avahi/avahi-daemon.conf. (equivalent
to sending a SIGHUP)
-c | --check
Return 0 as return code when avahi-daemon is already running.
-h | --help
Show help
-v | --version
Show version information
FILES
/etc/avahi/avahi-daemon.conf: the default configuration file for avahi-daemon, avahi-daemon.conf(5) for more information.
/etc/avahi/hosts: additional static hostname mappings to publish in mDNS, see avahi.hosts(5) for more information.
/etc/avahi/services/*.service: static service definitions, see avahi.service(5) for more information.
SIGNALS
SIGINT, SIGTERM: avahi-daemon will shutdown. (Same as --kill).
SIGHUP: avahi-daemon will reload unicast DNS server data from /etc/resolv.conf and static service definitions from /etc/avahi/services/.
(Same as --reload)
SIGUSR1: avahi-daemon will dump local and remote cached resource record data to syslog.
AUTHORS
The Avahi Developers <avahi (at) lists (dot) freedesktop (dot) org>; Avahi is available from http://avahi.org/
SEE ALSO
avahi-daemon.conf(5), avahi.hosts(5), avahi.service(5), avahi-dnsconfd(8), avahi-set-host-name(1)
http://avahi.org/wiki/AvahiAndUnicastDotLocal documents the problems when using Avahi in a unicast DNS zone .local.
COMMENTS
This man page was written using xml2man(1) by Oliver Kurth.
Manuals User avahi-daemon(8)