Hot code loading
From Openmoko
To change a running system
Start erlang as a node
This is my /etc/X11/Xsession.d/80zhone. As you can see the erlang node's got a name "-name neo@192.168.0.202" (a running erlang virtual machine is called an erlang node). And it's got a cookie "-setcookie SFEWRG34AFDSGAFG35235".
#!/bin/sh -e #zhone > /tmp/zhone.log 2>&1 & /home/root/cean/start.sh -setcookie SFEWRG34AFDSGAFG35235 -name neo@192.168.0.202 -noshell -pa /home/root/trunk -s main start > debug.txt renice -3 $! exit 0
Every erlang node in your network should have a unique name, and a common cookie. Start an erlang node on your host PC with a unique name and the common cookie:
erl -setcookie SFEWRG34AFDSGAFG35235 -name 'host@192.168.0.200'
From your host erlang console try
net_adm:ping('neo@192.168.0.202').
The response should be 'pong' if you have a successful connection - if not, the response is 'pang'
Then try the shell command
nodes().
The response should be a list of all known nodes in your network.
HotLoad the code
To carry out Hot Code Loading you copy your compiled code to the neo as usual, then start a an erlang node on your host and from this erlang shell type
nl(your_modulename).
Substitute your_modulename with the name of the module you want to load into the virtual machine on your neo. The ping command is only necessary the first time to let your host node find your neo node.
