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Re: [Fab-user] Running commands on multiple servers in a command

From: Jorge Vargas
Subject: Re: [Fab-user] Running commands on multiple servers in a command
Date: Wed, 20 May 2009 13:06:21 -0400

On Thu, May 14, 2009 at 4:06 PM, Jeff Forcier <address@hidden> wrote:
> On Thu, May 14, 2009 at 9:46 AM, Peter Sheats <address@hidden> wrote:
>> Maybe this is possible but I'm not understanding how to do this.
>> Server 1 is the webserver
>> Server 2 is the media server
>> My deployment strategy requires doing something on both to deploy.  However,
>> what i do on Server 2 is dependent on information I find from Server 1.
>> I want to run 'fab live deploy' and do the following:
>> def deploy():
>>     run("stuff on server1")
>>     value = run("value based on info from Server 1")
>>     # now, based on value from server 1
>>     run("commands on server2")
>>     #whole project successfully deployed now
>> Am I not understanding something or is this use-case not supported?
> I assume you're referring to 0.9, correct me if I'm wrong :)
> The default execution model is simply "obtain host list for given task
> function, run function once per host". I wrote down some ideas in the
> project's TODO list for ways to update this, since I definitely want
> things to be more flexible in this area.
> However, all that really matters to run() or sudo() is that
> env.host_string is defined, so you can currently do something like
> this (ensuring not to set the host list on the command line or in your
> fabfile):
> def deploy():
>    env.host_string = 'server1'
>    run("stuff on server1"
>    value = run("/get/my/value --please")
>    env.host_string = 'server2'
>    run("stuff on server2")
Awesome recipe it should be documented on sphinx? I wanted to switch
host at runtime too.

> While I haven't explicitly tested this exact usage out, it *should* work.
> -Jeff
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