Description:-
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Under the section 9.2.1. Configuring the iSCSI Target using Ansible in 
https://access.redhat.com/documentation/en/red-hat-ceph-storage/2/paged/administration-guide/chapter-9-using-an-iscsi-gateway-technology-preview

there is note added to install ceph-iscsi-config package on all the iscsi gw nodes. But the step to add them is missing.
The ceph-iscsi-config package is available in rhceph-tools repo and ansible installs the package on dedicated iscsi gw node subscribed to tools repo. On a co-located OSD node - the package fails to install and ansible playbook fails.

To fix this we need to add tools repo on OSD nodes., this workaround can be added to the Note for now

If we really need a fix, then we must add ceph-iscsi-config package in OSD and MON rpms also.


Here is the Note as mentioned in the doc
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Note.
The ceph-iscsi-config package is installed on the Ceph iSCSI gateway nodes listed under the [ceph-iscsi-gw] section in the /etc/ansible/hosts file.