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The above answers have the right idea: For the tasks on the COA, do not worry about what Horizon interface you practice on, the concepts you will be tested on are the same across distros. You will, however, want to spend time practicing with openstackclient in the command line.

If you're finding issues with DevStack, you can practice most (but not all) of the tasks with TryStack, or you can get set up with an all-in-one OpenStack using Vagrant (https://github.com/hogepodge/getting-started-with-openstack). If you'd rather not run this on your machine, check out the OpenStack public cloud options in the Marketplace (https://www.openstack.org/marketplace/public-clouds/), where you can grab enough time to run through the COA tasks on OpenStack fairly inexpensively.

The above answers have the right idea: For the tasks on the COA, do not worry about what Horizon interface you practice on, the concepts you will be tested on are the same across distros. You will, however, want to spend time practicing with openstackclient in the command line.

If you're finding issues with DevStack, you can practice most (but not all) of the tasks with TryStack, or you can get set up with an all-in-one OpenStack using Vagrant (https://github.com/hogepodge/getting-started-with-openstack). (github.com/hogepodge/getting-started-with-openstack). If you'd rather not run this on your machine, check out the OpenStack public cloud options in the Marketplace (https://www.openstack.org/marketplace/public-clouds/), (openstack.org/marketplace/public-clouds), where you can grab enough time to run through the COA tasks on OpenStack fairly inexpensively. inexpensively.