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sudo snap install microceph
sudo microceph cluster bootstrap
sudo microceph.ceph status
Here you should see that there is a single node in the cluster.
sudo microceph.ceph osd crush rule rm replicated_rule
sudo microceph.ceph osd crush rule create-replicated single
default osd
sudo microceph disk add /dev/sd[x] --wipe
Repeat for each disk you would like to use as an OSD on that node, and additionally on the other nodes in the cluster. Cluster status can be verified using:
sudo microceph.ceph status
sudo microceph.ceph osd status