Brandon, This bit
*However, it’s often convenient to wrap up multi-task invocations like this into their own, “meta” tasks.* describes exactly what I'm looking for; thanks! On Sat, Oct 26, 2013 at 9:39 AM, Brandon Whaley <redkr...@gmail.com> wrote: > Hi Nathan, there are some more detailed use cases of execute here: > http://docs.fabfile.org/en/1.8/usage/execution.html?highlight=execute#intelligently-executing-tasks-with-execute > > I use it to (for example) run VPS creation commands on a host node, then > run OS configuration commands on the resulting container once it has been > started. The model you're probably looking for is: > > execute(do_work, hosts=host_list) > > Where do_work is another fabric task and host_list is just a list of host > strings. > > > On Sat, Oct 26, 2013 at 2:24 AM, Nathan Nobbe <quickshif...@gmail.com>wrote: > >> Brandon, >> >> Cool stuff, I was able to get this example from the answer on SO >> >> >> http://stackoverflow.com/questions/15841024/python-fabric-no-host-found-must-manually-set-env-host-string >> >> working pretty easily with multiple hosts, and I see the power here, but >> now I'm using python at the command line instead of fab. Can execute be >> used within fabric tasks to change the set of hosts and run new actions on >> the new hosts? >> >> thanks, >> >> -nathan >> >> >> On Fri, Oct 25, 2013 at 9:51 PM, Brandon Whaley <redkr...@gmail.com>wrote: >> >>> 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. >>>> >>>> ______________________________**_________________ >>>> Fab-user mailing list >>>> Fab-user@nongnu.org >>>> https://lists.nongnu.org/**mailman/listinfo/fab-user<https://lists.nongnu.org/mailman/listinfo/fab-user> >>>> >>> >>> _______________________________________________ >>> Fab-user mailing list >>> Fab-user@nongnu.org >>> https://lists.nongnu.org/mailman/listinfo/fab-user >>> >>> >> >
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