Tags: detail

07/04/13

  05:59:00 pm, by The Dreamer   , 476 words  
Categories: Software, CFEngine

Upgrading from CFEngine 2 to CFEngine 3

I just learned of a key missing detail that would probably have helped lots of other CFEngine 2 sites make the transition to becoming CFEngine 3 sites.

All the sites, include CFEngine's have docs about Upgrading from CFEngine 2 to 3....

Where, the touch, or go in-depth, on conversion of policies from 2 to 3, extol how 3 is better than 2, and then offer vague options on how to upgrade (either in-place or replace)....

The most detailed explanation was a slide deck...which wasn't detailed enough.... that says "CF2 and CF3 designed to be interoperable", "Replace CF2 policies at your pace". How?

In-Place Upgrade

"Replace cfexecd with CFEngine 3's cf-execd" - Access controls remains untouched, runs cf-agent.

"Sample input files contain integration promises" - Launched automatically, Changes crontab

And, then get's in the steps:

  • Install CFEngine 3
  • Copy new inputs files to CF2 master repository
  • Remove any rules to reinstall CF2 or add cfexecd or cfagent to crontabs
  • Remove cfexecd from start up
  • Edit update.cf
  • set email options for executor in promises.cf
  • cf-agent --bootstrap

If all went well, you are now running CFEngine 3.

Bootstrap policy server using:

cf-agent --bootstrap --policy-server

  • Remove all rules and policies that are capable of activating CFEngine 2 components
  • Convert cfservd.conf into a server bundle
  • Place a reference to this in promises.cf
  • Add converted CFEngine 2 policies or create new CFEngine 3 policies
  • Done???? :??:

    Somethings missing....where's this interoperability taking place? Does CF3 know how to run CF2 policies? no... where's this replace CF2 with CF3 at my pace? Reads like its a full in-pace replacement of CF2 to CF3....

    So I finally made a reference about this on a list...

    Answer?!

    It's why the CF3 binaries have dashes in the name. So you can drop them into the CF2 working directory.... The trick is editing the exec_command in the executor configuration, that's the command for running the agent; modify it to run both agents (v2 and v3).

    Wow...that's kind of an important detail that's been missing!

    Full story »

    Now instead of subjecting some poor random forum to a long rambling thought, I will try to consolidate those things into this blog where they can be more easily ignored profess to be collected thoughts from my mind.

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