PREREQ
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yum install pyparsing python-kmod python-gobject python-urwid python-rados python-rbd python-netaddr python-netifaces python-crypto python-requests python-flask pyOpenSSL git
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KERNEL
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CentOS7.5 - 3.10.0-862.3.2.el7.x86_64 
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PACKAGES
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tcmu-runner
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git clone https://github.com/open-iscsi/tcmu-runner
cd tcmu-runner
sed -e '/glusterfs-api/ s/^#*/#/' -i extra/install_dep.sh
sh extra/install_dep.sh
cmake -Dwith-glfs=false -Dwith-qcow=false -DSUPPORT_SYSTEMD=ON -DCMAKE_INSTALL_PREFIX=/usr
make
make install
systemctl daemon-reload
systemctl enable tcmu-runner
systemctl start tcmu-runner
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rtslib-fb
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git clone https://github.com/open-iscsi/rtslib-fb.git
cd rtslib-fb
python setup.py install
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configshell-fb
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git clone https://github.com/open-iscsi/configshell-fb.git
cd configshell-fb
python setup.py install
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targetcli-fb
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sed -i '/\[base\]/a exclude=targetcli*' /etc/yum.repos.d/CentOS-Base.repo
sed -i '/\[updates\]/a exclude=targetcli*' /etc/yum.repos.d/CentOS-Base.repo
git clone https://github.com/open-iscsi/targetcli-fb.git
cd targetcli-fb
python setup.py install
mkdir /etc/target
mkdir /var/target
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ceph-iscsi-config
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git clone https://github.com/ceph/ceph-iscsi-config.git
cd ceph-iscsi-config
python setup.py install
cp usr/lib/systemd/system/rbd-target-gw.service /lib/systemd/system
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ceph-iscsi-cli
----
git clone https://github.com/ceph/ceph-iscsi-cli.git
cd ceph-iscsi-cli
python setup.py install
cp usr/lib/systemd/system/rbd-target-api.service /lib/systemd/system
=============
Setup 
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Create /etc/ceph/iscsi-gateway.cfg on each node
	[config]
	# Name of the Ceph storage cluster. A suitable Ceph configuration file allowing
	# access to the Ceph storage cluster from the gateway node is required, if not
	# colocated on an OSD node.
	cluster_name = ceph

	# Place a copy of the ceph cluster's admin keyring in the gateway's /etc/ceph
	# drectory and reference the filename here
	gateway_keyring = ceph.client.admin.keyring


	# API settings.
	# The API supports a number of options that allow you to tailor it to your
	# local environment. If you want to run the API under https, you will need to
	# create cert/key files that are compatible for each iSCSI gateway node, that is
	# not locked to a specific node. SSL cert and key files *must* be called
	# 'iscsi-gateway.crt' and 'iscsi-gateway.key' and placed in the '/etc/ceph/' directory
	# on *each* gateway node. With the SSL files in place, you can use 'api_secure = true'
	# to switch to https mode.

	# To support the API, the bear minimum settings are:
	api_secure = false

	# Additional API configuration options are as follows, defaults shown.
	# api_user = admin
	# api_password = admin
	# api_port = 5001
	# trusted_ip_list = 192.168.0.10,192.168.0.11

systemctl daemon-reload
systemctl enable rbd-target-api
systemctl start rbd-target-api 
systemctl enable rbd-target-gw
systemctl start rbd-target-gw
systemctl start tcmu-runner
systemctl enable tcmu-runner

gwcli
follow official doc