How to modify devstack after basic deployment

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I have deployed a basic openstack using devstack. now I want to install additional component like designate or magnum. What is the way to do that?

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I would try the Magnum installation guide. It gives you two options: Install using apt/yum/zypper packages, or install using pip.

You need to ensure you install the version that matches your Devstack version. E.g. if your Devstack is Ussuri, use Ussuri instructions.

Another possibility might be amending local.conf and rerun stack.sh. I am not sure if this breaks already installed software, though.

The safest solution is to add the enable_plugin directives for Magnum to local.conf before you deploy the cloud.