Cloud Erlang

Erlang:Bring cloud to your application Ngoc Dao

Normally, you bringyour application → cloudErlang lets you bringcloud → your application

Normally,cloud is at OS levelErlang lets you create and controlcloud at application level,your application

It’s because Erlang feels like an OSYou can control the OS in your application

ps → pman:start().

top → etop:start().

applications → applications appmon:start(). webtool:start(). observer:start().

“We are dropping appmon, and replacing it with observer instead.”

observer:start().

webtool alternative: BigWig

debugger:start().

Let’s create a cloud

Guest Guestmachine machine mynode1 mynode2 Erlang process Erlang process Erlang process Erlang process Erlang process Erlang process … … Host machine

Create 2 nodes$ erl -sname mynode1 -setcookie mypassword1 -detached$ erl -sname mynode2 -setcookie mypassword2 -detached

Check if the nodes are on$ ps aux Host machine Guest[output] machineepmd -daemonbeam.smp ... -sname mynode1 -setcookie mypassword1 -noshell -noinputbeam.smp ... -sname mynode2 -setcookie mypassword2 -noshell -noinput Guest machine

Guest Guestmachine machine mynode1 mynode2 Erlang process Erlang process Erlang process Erlang process Erlang process Erlang process … … epmd Host machine

Login to mynode1$ erl -sname mynode3 -setcookie mypassword1 -remsh mynode1@ngocFrom here, to stop mynode1:init:stop(). or q().To quit without stoping mynode1:Ctrl+C

More topics• Deploy code to nodes• Connect nodes together• Hot code swap

Cloud Erlang

by Ngoc Dao

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