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CloudI is an open-source private cloud computing framework for efficient, secure, and internal data processing. CloudI provides scaling for previously unscalable source code with efficient fault-tolerant execution of ATS, C/C++, Erlang/Elixir, Go, Haskell, Java, JavaScript/node.js, OCaml, Perl, PHP, Python, or Ruby services.

The bare essentials for efficient fault-tolerant processing on a cloud!

System Requirements

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Released at 2017-01-12 10:12
cloudi 1.6.0 (2 files Hide)

Release Notes

  • backwards compatibility difference:
    • Functions deprecated in the 1.3.3 CloudI release have been removed
    • Usage of the 'immediate' atom for the timeout value with the cloudi_service Erlang module and the cloudi Erlang module is deprecated, use the 'limit_min' atom instead for the same value
    • The minimum allowable values for service configuration (both adding a new service and updating an existing service) of timeout_async and timeout_sync has changed from 101 milliseconds to 499 milliseconds to be consistent with the value that 'limit_min' represents
    • The service configuration options request_timeout_immediate_max and response_timeout_immediate_max had their meaning change to rely on a greater than or equal to comparison instead of a greater than comparison, though the same default behavior is preserved with this change (
  • Now cloudi_core doesn't use any port drivers or NIFs except what is provided within Erlang/OTP, and process dictionary use is minimal
  • The Elixir module CloudILogger is now included in the cloudi_core Erlang application to simplify usage of CloudI in Elixir source code
  • Bugs related to CloudI logging syslog integration have been fixed and more options for syslog use have been added ( has more information)
  • The restart_delay service configuration option was added (
  • CloudI service restarts have been made synchronous to ensure all termination has completed before initialization of new processes begins (to improve reliable management of global state during a restart)
  • All service configuration timeout values that take milliseconds also accept the Erlang atoms 'limit_min' and 'limit_max' where 'limit_max' is a concept similar to the 'infinity' atom in Erlang source code, though it does represent 49.7 days in milliseconds, so be careful about its use (no one wants to wait 49.7 days to see a failure)
  • All CloudI API implementations now handle a null return value as a response to create a null response, if the programming language has a concept of null (for more information, see the null integration test and/or read about a null response at
  • All CloudI API implementations now put stdout and stderr into unbuffered mode to ensure CloudI service output is logged as quickly as possible
  • Bugs were fixed and other improvements were added (see the ChangeLog for more detail)


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