Download Devstack:

git clone https://opendev.org/openstack/devstack
cd devstack

Add this repo as an external repository in local.conf file:

[[local|localrc]]
enable_plugin ceilometer https://opendev.org/openstack/ceilometer

To use stable branches, make sure devstack is on that branch, and specify the branch name to enable_plugin, for example:

enable_plugin ceilometer https://opendev.org/openstack/ceilometer stable/mitaka

There are some options, such as CEILOMETER_BACKEND, defined in ceilometer/devstack/settings, they can be used to configure the installation of Ceilometer. If you don't want to use their default value, you can set a new one in local.conf.

Alternitvely you can modify copy and modify the sample local.conf located at ceilometer/devstack/local.conf.sample

Run stack.sh.