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I want to use avahi on a system with a read-only rootfs where /etc is not writable.

I can start avahi-daemon with the -f option to specify a non-standard location for the avahi-daemon.conf file (default location is /etc/avahi/avahi-daemon.conf). However I can't find any way to specify a non-standard location for the service definitions (default location is /etc/avahi/services). Is there any option for this ?

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It seems that Avahi does not provide any configuration option for searching for service definitions in a non-standard location (other than rebuilding with a custom --prefix, but that obviously has other implications). In case someone else needs this, these are the options I've found:

  • Symlink /etc/avahi/services to a different directory. For this to work, the avahi daemon must be started with the --no-chroot option; otherwise it will not be able to reach out of the chroot jail.
  • Bind mount a different directory on /etc/avahi/services. This does not require that --no-chroot is used.

Both options work fine.

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(Using a answer window as it has more formatting options)

Note that Avahi service definitions allow wildcards. This might be adequate to allow the same definition on multiple hosts, thus allowing read-only /etc:

<?xml version="1.0" standalone='no'?><!--*-nxml-*--> <!DOCTYPE service-group SYSTEM "avahi-service.dtd"> <service-group> <name replace-wildcards="yes">%h</name> <service> <type>_ssh._tcp</type> <port>22</port> </service> </service-group>
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  • How does this answer the question ? Commented Feb 11, 2015 at 17:03

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