ASR multicast restore

ASR multicast restore

16/07/12 | by admin [mail] | Categories: Mac OS X

Full article here

You do this from terminal. So you can do it from at least 10.4+ install media.

You will need an image (dmg) ready, and accessible from the computer running asr. First prepare the image with:

asr -imagescan image.dmg

For unicast, you can now chuck the image on a share and run:
asr -source afp://fileserver.example.com/image.dmg -target /Volumes/MacintoshHD -erase

The tricky bit:
You need to create a plist config file. It needs bugger all inside it, but is a necessary step.

Two keys are required—Data Rate and Multicast Address—but additional keys are supported to specify functionality. You can create it in property list editor, or just fire up pico and make sure you create all the necessary headers by hand.
It should look something like:

Code:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
        <key>Data Rate</key>
        <integer>600000</integer>
        <key>Multicast Address</key>
        <string>224.77.2.121</string>
</dict>
</plist>

Now you have created the plist, you can start your asr multicast server

asr -source multicastimage.dmg -server configuration.plist

And from the client computers, you can join the multicast with:

asr -source asr://myserver.com -target /Volumes/MacintoshHD -erase

The rest of the article discusses sensible network considerations (multicast traffic is something which needs to be managed carefully), and GUI front ends (what's the point? ;) )

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