iscsi server:

1.installl targetcli packaget

[root@localhost ~]# yum install -y targetcli

[root@localhost ~]# systemctl enable target;  systemctl start target;

[root@localhost ~]# firewall-cmd --permanent --add-port=3260/tcp;firewall-cmd --reload

2.lvm create lv block

3. targetcli create target

iscsi clinet :

1.connection iscsi target

yum install -y iscsi-initiator-utils

[root@localhost ~]# systemctl enable iscsid iscsi

vim /etc/iscsi/initiatorname.iscsi 
c:InitiatorName=iqn.2016-05.com.example:desktop10
:wq


[root@localhost ~]# man iscsiadm

[root@localhost ~]# iscsiadm --mode discoverydb --type sendtargets --portal 192.168.3.157 --discover

[root@localhost ~]# systemctl restart iscsid iscsi

[root@localhost ~]# iscsiadm --mode node --targetname iqn.2017-10.com.example:server10 --portal 192.168.3.157:3260 --login

2. fdisk block && mkfs.xfs && automount

[root@localhost ~]# mkfs.xfs /dev/sdb5
[root@localhost ~]# vim /etc/fstab 
+ UUID="48903d6d-095c-44b5-93e2-ddd745aba453" /iscsi      xfs     defaults,_netdev        0 0
:wq
mount -a

when iscsi client have problem : see websit