如何一次在多个服务器上组织Web应用程序部署？

Question

So - let's say I develop a PHP app which I develop in a vagrant box identical to production envrionment. So - as an end result I would have a *.tar.zip file with a code...

How would one organize a deployment into production environment where there are a lot of application servers? I mean - I'm confused how to push code into production synchronously all at once?

More information:

on server code is stored like this:

project
  +current_revision ->link to revisions/v[n]
  +revisions
    +v1
    +v2
    +v3
    ...
  +data

So when I have to deploy changes I usually run a deploy script that uploads updated tar onto server with ssh, untars into specific dir under revisions, symlinks it into current_revision and restart php-fpm.... This way I can rollback anytime just by symlinking to an older revision.

with multipe servers what bothers me is that not all boxes will be updated at once, ie. technically some glitches might be possible.

Answer 1

Lots of ways. If starting from barebones (no cloud infrastructure), I'm a fan of the SVN branch hook. Have a SVN repo for your code. Set up a post-commit hook on it, which checks if anything in /branch/production/ has been changed.

If it has, let the post-commit hook fire all your automated roll-out procedure - and in this case, an easy way to do so is to let all your servers known* to svn export the branch. As simple as that!

(* that's the hard step)