Thinking about the "change" and the "reverted to change" as two
different machine states, that both need to be coded in Puppet, is
definitely right answer, I am starting to understand. No way puppet
could figure out what how to get to the previous state.
In my case I think all our initial changes, as we add more and more to
puppet, will have a puppet-less 'revert" procedure:
- Change via puppet.
- Revert (the old way)t:
for host in hosts:
ssh to host
run command1
run command2....
Thanks,
Mohamed.
On Mon, Apr 25, 2011 at 1:56 AM, pzi <pzi...@gmail.com> wrote:
> File content is just a small part of what puppet classes generally do.
> Average module if coded properly will include number of operations
> like starting/configuring services, cron jobs, editing files,
> installing packages, etc. and I think the only way to satisfy that
> average change control 'revert' is to code the reverse operation while
> you code the change.
> I would compare it to rc init scripts what have 'start' and 'stop'
> operations. It is all a matter of coding standards and defensive
> design.
> -Peter
>
> On Apr 24, 5:12 am, James Turnbull <ja...@puppetlabs.com> wrote:
>> Mohamed Lrhazi wrote:
>> > For each change to production systems, one has to submit a script
>> > detailing what changes will be made and how to revert them back.. I
>> > was wondering if any of you, who implemented something similar, would
>> > care to share how they did it.
>>
>> There is no such thing as rollback. :)
>>
>> I wrote roll in and roll out manifests and tested both. The roll in
>> manifest made the required packages. The roll out manifest reversed
>> those changes.
>>
>>
>>
>> > Simply reverting puppet's own config to a previous repository version
>> > would not be enough in most cases, as it would not necessarily involve
>> > restoring overwritten files on the clients, if those files were not
>> > originally generated from puppet itself.
>>
>> Files can be backed up remote file buckets.
>>
>>
>>
>> > I guess Puppet's buckets would be involved in the answer, but my
>> > understanding is that they are not documented yet, correct? is such a
>> > feature planned for upcoming releases?
>>
>> It is documented.
>>
>> http://docs.puppetlabs.com/references/2.6.7/type.html#filebucket
>>
>> The feature already exists.
>>
>> Regards
>>
>> James
>>
>> --
>> James Turnbull
>> Puppet Labs
>> 1-503-734-8571
>
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