I prefer using execute:
http://docs.fabfile.org/en/1.8/api/core/tasks.html?highlight=execute#fabric.tasks.execute
On Oct 25, 2013 7:55 PM, "Gilgamezh" <lis...@gilgamezh.me> wrote:
> El 25/10/13 19:20, Nathan Nobbe escribió:
>
>> Hi everyone,
>>
>> I've recently started using Fabric (any Python for that matter)! So far
>> I'm loving Fabric compared to Capistrano, which is next to useless
>> outside of Ruby projects that I can tell.
>>
>> I have hit a snag with Fabric though, and I'm surprised nobody else
>> seems to have dealt with it. I've got sets of nodes that comprise an
>> 'environment'. For example, 2 boxes are used as db servers, 2 boxes as
>> application servers (not exactly my setup, but that's the idea).
>>
>> Now I can have 2 tasks for this with @host decorators that map the hosts
>> to the deployment logic, however, since there is no way to change the
>> hosts within a task, I have to make 2 separate calls to fab on the CLI.
>>
>> The problem is, I have several sets of nodes and the order of operations
>> in the deployment is itself some logic I would like to encapsulate. Best
>> approach I have so far is to place the fab calls into a BASH script.
>>
>> I'm shocked that there's no way to change hosts within a task, and
>> moreover that this desire hasn't arisen before. Is there some way to
>> change the hosts mid-task? I can't find anything on Google or
>> Stackoverflow. Or am I thinking about this the wrong way? Seems like
>> grouping the hosts the way I have makes sense. I took a look at roles,
>> but I don't think that's any different than say an @host decorator with
>> the 'db' servers for example.
>>
>> Your help appreciated!
>>
>> thanks,
>>
>> -nathan
>>
>>
>>
> Hi!
>
> roles are in the env dict. You can do this:
>
> env.roledefs.update({
> 'webserver': ['www1', 'www2'],
> 'dbserver': ['db1']
> })
>
> then.....
>
> for server in env.roledefs['webserver']:
> do something
> for server in env.roledefs['dbserver']:
> do something.
>
> In all the cases you can set a specific host
>
> for example:
>
> with settings(host_string='**somehost.domain'):
> do some
>
> it's just python! :D
>
> More in:
> http://docs.fabfile.org/en/1.**8/api/core/decorators.html?**
> highlight=roledefs<http://docs.fabfile.org/en/1.8/api/core/decorators.html?highlight=roledefs>
> http://docs.fabfile.org/en/1.**8/usage/env.html?highlight=**roledefs<http://docs.fabfile.org/en/1.8/usage/env.html?highlight=roledefs>
> http://docs.fabfile.org/en/1.**8/usage/execution.html?**highlight=roledefs<http://docs.fabfile.org/en/1.8/usage/execution.html?highlight=roledefs>
>
>
> regards!
>
> Gilgamezh.
>
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