Difference between revisions of "User talk:Wrea"

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-=Avahi=
-[http://avahi.org Avahi] is a Linux service for providing multicast-DNS/DNS-SD (also known as [http://en.wikipedia.org/wiki/Bonjour_%28software%29 Bonjour] or mDNS/DNS-SD). Avahi allows for simple service discovery and advertisement on a local network and provides name resolution for all hosts running a mDNS/DNS-SD service.
-Using Avahi allows for easy SSH access, among other things, over a local wireless network. Once installed and started, users can ssh to their device using their mDNS assigned hostname.
-==Avahi Installation==
-For 2.x and 3.x devices, avahi can be found in the alpha repo, any other devices install via ipkg as follows:
-First, use novacom to access the Pre and install the Avahi ipkg.
- $> sudo /opt/bin/ipkg-opt install avahi
-Avahi seems to want to run as a user named "avahi".  To create the user, run the following command:
- $> adduser -h /opt/var/run/avahi avahi
-Avahi currently attempts to access a different dbus system socket than the one provided by the Pre's dbus, it is possible to start Avahi with dbus support by creating a symbolic link from palm dbus directory to the /opt dbus directory and starting avahi daemon with root privileges. According to the Avahi website, however running avahi-daemon with root privileges is not recommended.
-The following command will create a symbolic link to /opt dbus directory to palm dbus directory:
- ln -s /var/run/dbus /opt/var/run/dbus
-if preferred avahi can be be ran without dbus support by editing <tt>/opt/etc/avahi/avahi-daemon.conf</tt> and make the following change:
- Replace this line:
- #enable-dbus=yes
- With this line:
- enable-dbus=no
-However, this does not allow the use of avahi commands such as avahi-browse, avahi-publish etc...
-At this point, the Avahi daemon can be started with root privileges and dbus support with the following command:
- $> /opt/sbin/avahi-daemon --no-drop-root
-If you disabled dbus support however it is recommended to run Avahi daemon without root privileges using the following command:
- $> /opt/sbin/avahi-daemon
-If you would like Avahi to start up at boot, create the following two files:
-'''/opt/etc/init.d/S60avahi'''
- #!/bin/sh
- [ -e /opt/etc/default/avahi ] && . /opt/etc/default/avahi
- if [ "$AVAHI_ENABLE" = "no" ]; then
-     exit
- fi
- if [ -n "`pidof /opt/sbin/avahi-daemon`" ]; then
-     killall /opt/sbin/avahi 2>/dev/null
- fi
- /opt/sbin/avahi-daemon -D
-'''/opt/etc/default/avahi'''
- AVAHI_ENABLE=yes
-Make sure you set the startup script to executable:
- $> chmod 755 /opt/etc/init.d/S60avahi
-Alternatively, you can create an upstart script at '''/etc/event.d/avahi''':
- start on started PmConnectionManager
- console output
- exec /opt/sbin/avahi-daemon -D
- respawn
-NOTE: This script is not being stored in the /opt directory. You may have to replace it after an update, and it may cause problems with your Pre.
-==Connecting via SSH using mDNS==
-mDNS uses the system's hostname and appends it to the <tt>local.</tt> domain. Using the Pre's default <tt>palm-webos-device</tt> hostname, the following command would be used to SSH to your Pre on port 222:
- $> ssh -P 222 palm-webos-device.local.
-If you are using an OpenSSH key to connect:
- $> ssh -i /path/to/ssh/key palm-webos-device.local.
-'''Note: The system that you are connecting from MUST have a mDNS service also running, else the hostname will not resolve'''
-==Current Issues on the Pre==
-* The ipkg binary of Avahi attempts to find the dbus socket at <tt>/opt/var/run/dbus/system_bus_socket</tt>, but the Pre's dbus socket is at <tt>/var/run/dbus/system_bus_socket</tt>. I have detailed a solution by running Avahi with root privileges however an approach which allow it to run after dropping root privileges is preferred.
-* The avahi-daemon seems to have issues keeping the mDNS name resolution running for more than a few minutes. I don't know if this is a power management issue or something else at this point.

Difference between revisions of "User talk:Wrea"

Latest revision as of 02:17, 28 December 2011

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