Hot code loading

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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

net_adm:ping('neo@192.168.0.202'). 
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.

Personal tools

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

net_adm:ping('neo@192.168.0.202'). 
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.