Popularity
5.3
Declining
Activity
0.0
Stable
9
3
1

Monthly Downloads: 18
Programming language: Haskell
License: BSD 3-clause "New" or "Revised" License
Tags: System    

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README

graceful

Library to write graceful shutdown / upgrade service.

Build Status

Install

$ cabal update
$ cabal install graceful

Controll Graceful Application

A graceful application can be controlled with signals. The master process supports the following signals

  • TERM/INT
    • fast shutdown
  • QUIT
    • graceful shutdown
  • HUP
    • restart workers
      1. starting new worker processes
      2. graceful shutdown old worker processes
  • USR2
    • upgrading an executable file (starting new master & worker processes)

Upgrading Executable on the Fly

  1. Send USR2
  2. Send QUIT to old process