Re: [Fab-user] How to gracefully/elegantly collect data about failed hosts when using fabric.api.execute? (v1)

[Brandon Whaley]

By catching the exception raised when a connection fails.  The connection doesn't initiate until the first time you call run() or another remote function.

On Thu, May 17, 2018 at 1:08 PM Abhijeet Rastogi <address@hidden> wrote:

Hi Brandon,

Thanks. But how do I handle cases like host connection failures etc? I don't have control over returning that information from task function. 

Thanks

On Thu 17 May, 2018, 20:56 Brandon Whaley, <address@hidden> wrote:

You need to have your worker function catch any exceptions (https://github.com/fabric/fabric/blob/1.14/fabric/exceptions.py) and evaluate success/failure, then return a value useful to you in determining if your task was successful.  Returning "None" for failure modes is something I've done before.

On Thu, May 17, 2018 at 11:15 AM Abhijeet Rastogi <address@hidden> wrote:

Anyone? I was hoping if someone can help me with this.

On Wed, May 16, 2018 at 9:03 PM Abhijeet Rastogi <address@hidden> wrote:

Hi everyone,

Let's suppose I have a simple code like this. 

from fabric.api import run, env, execute
from fabric import state

env.use_ssh_config = True
env.parallel = True

hosts = ['success.host', 'failure.host']

def get_uptime():
    output = run("uptime")
    return output

collected_output = execute(get_uptime, hosts=hosts)
for host, output in collected_output.iteritems():
    if output is not None:
        print("{0}:\n{1}".format(host, output))

How do I continue my execution of code beyond execute method invocation to print successful hosts output and also give a summary of failed hosts?

I don't want to fabric library to show warnings or exit code when that happens. I read about envenv.abort_exception but I'm not sure how to use that to do both things, capture output of successful tasks and show failed hosts as that exception doesn't have any arguments.

Any help is appreciated

--

Cheers,
Abhijeet Rastogi (shadyabhi)

--

Cheers,
Abhijeet Rastogi (shadyabhi)

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