lrbd Cannot install lrdb on CentOS7

I have a 4 node of CEPH Cluster

rebuild topo

Then after install successfully CEPH i start install Lrdb on 3node OSD but cannot install

[root@node1 ~]# yum install lrbd
Loaded plugins: fastestmirror
Ceph                                          | 2.9 kB     00:00     
Ceph-noarch                                   | 2.9 kB     00:00     
base                                          | 3.6 kB     00:00     
ceph-source                                                     | 2.9 kB  00:00:00     
elrepo                                                          | 2.9 kB  00:00:00     
epel/x86_64/metalink                                            | 8.0 kB  00:00:00     
epel                                                            | 4.3 kB  00:00:00     
extras                                                          | 3.4 kB  00:00:00     
updates                                                         | 3.4 kB  00:00:00     
(1/3): updates/7/x86_64/primary_db                              | 2.7 MB  00:00:00     
(2/3): epel/x86_64/primary_db                                   | 4.8 MB  00:00:02     
(3/3): epel/x86_64/updateinfo                                   | 840 kB  00:00:24     
Loading mirror speeds from cached hostfile
* base: mirrors.nhanhoa.com
* elrepo: hkg.mirror.rackspace.com
* epel: mirror.ehost.vn
* extras: mirrors.nhanhoa.com
* updates: mirrors.nhanhoa.com
No package lrbd available.
Error: Nothing to do
[root@node1 ~]# uname -sr 
Linux 4.13.5-1.el7.elrepo.x86_64
[root@node1 ~]# cat /etc/redhat-release 
CentOS Linux release 7.4.1708 (Core)

CEPH version

[root@node1 ~]# ceph -v 
ceph version 10.2.10 (5dc1e4c05cb68dbf62ae6fce3f0700e4654fdbbe)

On Ceph docs requirement on ISCSI Target is RHEL/CentOS 7.4; or Linux kernel v4.14 or newer so my environment with Linux 4.13.5 and 7.4.1708 (Core) is OK?

How can i using iSCSI on my CEPH cluster