The Avahi mDNS/DNS-SD daemon


avahi-daemon[ options ]
avahi-daemon --kill

avahi-daemon --reload

avahi-daemon --check


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 configures 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/services/*.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.


-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-daemon.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


/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.


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.


The Avahi Developers <avahi (at) lists (dot) freedesktop (dot) org>; Avahi is available from http://avahi.org/


This man page was written using xml2man(1) by Oliver Kurth.


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.

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