Hello,

  I'm currently prototyping the use of Puppet to manage a bunch of
home-made applications on a lot of servers.
  As our applications evolves frequently and multiples versions can
be used at the same time, we use classes that include version in their
name, like "myApplication_1-2-0"

A typical application class like "myApplication_1-2-0" contains for
example a package to install, some configuration files as templates, a
crontab, a service definition and a mount point

When I want to deploy version 1-3-0 of my application on a node, to
replace version 1-2-0, the standard way to do with puppet, as I
understand it, would be :
  - node initially contains "include myApplication_1-2-0"
  - I edit node to contains "include myApplication_1-2-0::remove"
where myApplication_1-2-0::remove is a class that removes everything
myApplication_1-2-0 installed
  - I apply the config to node
  - I edit the node to contains "include myApplication_1-3-0"
  - I apply the config to node

But on node, there is the localconfig.yaml file (usually in /var/lib/
puppet/) that contains everything needed to know what should be
removed when myApplication_1-2-0 is installed.
I was thinking of automating this step like this :
  - retrieve config from master
  - retrieve local config (in localconfig.yaml)
  - if an application has not the same version on the master and
locally then
  a)  change everything to absent for version which is locally
installed
  b) apply this, so local version is removed
  c) then apply config from master, so new version is installed

Do you think it's a good approach ?
If not, do you know an alternate ways to manage applications that have
several versions ?

thanks for your answers
nicolas

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