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| Associated executables are tools including `avahi-browse` and `avahi-discover`. The primary functionality is a service, accessed in `systemd` as `avahi-daemon.service`. | <<TableOfContents>> |
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| == Accessing Local Services == To make use of the "hostname.local" name resolution, an additional dependency (commonly named `nss-mdns`) is required. Insert `mdns_minimal [NOTFOUND=return]` into `/etc/nsswitch.conf`, as below. {{{ hosts: files mymachines myhostname mdns_minimal [NOTFOUND=return] resolve [!UNAVAIL=return] dns }}} More powerful configurations are of course possible, but this is the simplest and most minimal one. You should be able to discover local services now. Try: {{{ avahi-browse --all }}} |
== Installation == |
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| == Hosting Services == | == Advertising Services == |
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| Also, Avahi broadcasts over port 5353. See details in [[UFWSetup|the article for UFW setup]]. | === Networking === Avahi broadcasts over port 5353. A common pitfall is failing to account for this in the firewall. See details in the articles for [[UFW|UFW]]. ---- == Inspecting Services == === Name Resolution === To make use of the `.local` domain, an additional dependency (commonly named `nss-mdns`) is required. Insert `mdns_minimal [NOTFOUND=return]` into `/etc/nsswitch.conf`, as below. {{{ hosts: files mymachines myhostname mdns_minimal [NOTFOUND=return] resolve [!UNAVAIL=return] dns }}} === Terminal === {{{ avahi-browse --all }}} |
Avahi
Avahi is an implementation of Zeroconf, the zero-configuration method for network services. This would otherwise be accomplished through local DNS resolution.
Contents
Installation
Advertising Services
Avahi uses all /etc/avahi/services/*.service files that are readable by the avahi user and group. These take the form of structured XML. For example, an FTP service:
<?xml version="1.0" standalone='no'?>
<!DOCTYPE service-group SYSTEM "avahi-service.dtd">
<service-group>
<name>FTP</name>
<service>
<type>_ftp._tcp</type>
<port>21</port>
</service>
</service-group>
Networking
Avahi broadcasts over port 5353. A common pitfall is failing to account for this in the firewall. See details in the articles for UFW.
Inspecting Services
Name Resolution
To make use of the .local domain, an additional dependency (commonly named nss-mdns) is required.
Insert mdns_minimal [NOTFOUND=return] into /etc/nsswitch.conf, as below.
hosts: files mymachines myhostname mdns_minimal [NOTFOUND=return] resolve [!UNAVAIL=return] dns
Terminal
avahi-browse --all