Posted by Jim Morris
on Sun Sep 19 17:26:42 -0700 2010
Recently I needed to deploy an Erlang OTP application to a production
server, and was surprised at the lack of official documentation on how
to do that. My requirements are to have the application run on system
startup, and if the application crashes to have it automatically be
restarted, some optional requirements are to have rotated logs and
to get email notifications if the application does crash.
Erlang itself has several layers of supervision to keep its processes
running, however on occasion the VM itself may crash, if it runs out
of memory for instance. I would want the entire appliction to be
restarted in that case.
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Posted in
Erlang
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Tags
erlang,OTP,daemon
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2 comments
Posted by Jim Morris
on Sat May 02 00:09:36 -0700 2009
Background
I've been using cucumber to do all my integration testing. Usually
testing over the wire to a live system, regardless of what the target
system is written in (Ruby Rails, Merb, Java etc).
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Posted in
Erlang,Cucumber
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Tags
erlang,cucumber,bdd
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8 comments
Posted by Jim Morris
on Mon Apr 13 01:11:57 -0700 2009
In Erlang they have a very neat way of reading TCP packets that have a
header that specifies how big the following packet is. So long as you
send that header as a big-endian integer, you can use the built-in
mechanism. Then gen_tcp, takes care of making sure the entire packet
is read before passing it onto you.
Here is an example of a simple server getting packets from a client
using some simple binary protocol... For instance sending this binary
packet,
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Posted in
Erlang
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Tags
erlang,gen_tcp
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3 comments
Posted by Jim Morris
on Sun Apr 12 16:56:50 -0700 2009
Background
I recently undertook a project to rewrite a voice conference server I
wrote over 10 years ago. This server was written in C++ running on a
Windows Server (originally NT and then win2k). The reason it was
written for win2k was to use
I/O Completion Ports
which were not (and still are not) available on Linux.
Solaris has an equivalent AIO feature but not quite the same. I/O
Completion Ports make very efficient use of multiple CPU's, and the
conference server had to be very fast and handle a large number of
concurrent connections.
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Posted in
Erlang
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Tags
erlang,jinterface
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5 comments
