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Message |
< Erlang ~ Deploying embedded Erlang? |
| jacek99 |
 Posted: Fri Jun 12, 2009 12:51 pm |
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User
Joined: 26 May 2009
Posts: 27
Location: Montreal, Canada
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Is it possible to deploy an app with an embedded particular version of the Erlang runtime? (like Java JREs that are distributed with an app).
Or does Erlang always need to be in the standard /usr/lib/erlang folder (i.e. there can only be one version running at a time, you cannot have multiple Erlang apps on different versions of the runtime). |
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| Mazen |
| Posted: Sat Jun 13, 2009 2:37 pm |
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Joined: 20 Jul 2006
Posts: 164
Location: London
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Maybe something like this. Really quick version, I don't have much time  This is a minimal system... change it by adding different apps to your boot script.
Copy erts-X and bin directories from your Erlang directory where you installed Erlang
Code:
:~/target> cp -r /usr/local/lib/erlang/erts-5.6.5/ .
:~/target> cp -r /usr/local/lib/erlang/bin/ .
create some directories that are needed; lib is for your applications, pipes/ is where you will connect to Erlang and releases/1.0 is the version of your boot file (it can have any name)
Code:
:~/target> mkdir -p lib log pipes releases/1.0
copy in minimum applications into the lib dir
Code:
:~/target> cp -r /usr/local/lib/erlang/lib/kernel-2.12.5/ lib/
:~/target> cp -r /usr/local/lib/erlang/lib/stdlib-1.15.5 lib/
:~/target> cp -r /usr/local/lib/erlang/lib/sasl-2.1.5.4/ lib/
edit your start scripts;
Code:
In bin/erl:
Set the ROOTDIR env variable to `pwd`
In bin/start
Set the ROOTDIR env variable to `pwd`
Change "-daemon /tmp/" to "-daemon pipes/"
In bin/start_erl
Add additional Erlang flags after the -config switch and the ${1+"&@"} (E.g. "-sname mynode" etc..)
Create your rel file:
Code:
:~/target> echo -e "{release,{\"My Release\",\"1.0\"},{erts,\"5.6.5\"},\n\t [{kernel,\"2.12.5\"},\n\t {stdlib,\"1.15.5\"},\n\t {sasl,\"2.1.5.4\"}]\n}." > releases/1.0/start.rel
Build your boot file:
Code:
:~/target> bin/erl -noshell -eval 'systools:make_script("releases/1.0/start",[no_module_tests])' -s erlang halt
Specify release to boot and create empty config file:
Code:
:~/target> echo "5.6.5 1.0" > releases/start_erl.data
:~/target> echo "[]." > releases/1.0/sys.config
The rest should be a matter of adding more applications, configuration and stuff like that... but this should cover the basics
Also, by specifying the --prefix switch to the configure script when you compile Erlang you can choose where yo install it, E.g. ./configure --prefix=/my/special/dir ...
Hope it helps 
/Mazen |
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