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In newer Ansible versions (i.e. 2.10.6) the ec2_vol module does not accept an empty volume_size var if attaching an existing volume. Volume_size param should not exist in this case. This issue has been observed while redeploying (scheme _scheme_rmvm_keepdisk_rollback):
TASK [create/aws | Attach (or create) volumes where 'src' is present (e.g. inserted as part of _scheme_rmvm_keepdisk_rollback scheme)]
fatal: [localhost]: FAILED! => changed=false
msg: 'argument volume_size is of type <class ''str''> and we were unable to convert to int: <class ''str''> cannot be converted to an int'
The change has been successfully tested in creation (cluster.yml) and redeploy (redeploy.yml) playbooks.