EC2 Tasks For Fabric
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I’ve found myself doing more and more EC2 work of late and have finally gotten around to making my life easier when using Fabric with Amazon instances. The result of a bit of hacking is Cloth (also available on PyPi). It contains some utility functions and a few handy tasks for loading host details from the EC2 API and using them in your Fabric tasks. No more static lists of host names that constantly need updating in your fabfile.
Specifically, with a fabfile that looks like:
#! /usr/bin/env python from cloth.tasks import *
You can run:
fab all list
And get something like:
instance-name-1 (xx.xxx.xxx.xx, xxx.xx.xx.xx) instance-name-2 (xx.xxx.xxx.xx, xxx.xx.xx.xx) instance-name-3 (xx.xxx.xxx.xx, xxx.xx.xx.xx) instance-name-4 (xx.xxx.xxx.xx, xxx.xx.xx.xx) instance-name-5 (xx.xxx.xxx.xx, xxx.xx.xx.xx) instance-name-6 (xx.xxx.xxx.xx, xxx.xx.xx.xx) instance-name-7 (xx.xxx.xxx.xx, xxx.xx.xx.xx) instance-name-8 (xx.xxx.xxx.xx, xxx.xx.xx.xx) ...
And then you could run:
fab -P all uptime
And you’d happily get the load averages and uptime for all your EC2 instances.
A few more tricks are documented in the GitHub README,
including filtering the list by a regex and some convention based
mapping to Fabric roles. I’ll hopefully add a few more features as I
need them and generally tidy up a few things but I’m pretty happy with
it so far.
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