After installing Ceph I decided to write a separate article on adding Ceph nodes, because this process can be used in general.
To add more ceph nodes you will need to prepare the Ceph nodes as described in my previous articles. Search for Ceph Storage articles and focus on the preparation.
The following command will install the ceph software on additional nodes. It does not select the node role. Don't forget that you need to execute the commands from the cluster deploy direction on admin node.
$ ceph-deploy install <new_node> <new_node>
Note: You can use the --no-adjust-repos option if you are using different apt configurations for ceph. This is useful if you added different source repositories on each node and want each node to use these different repositories.