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231 lines
7.6 KiB
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=============================================================
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Configuring the iSCSI Target using the Command Line Interface
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=============================================================
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The Ceph iSCSI gateway is the iSCSI target node and also a Ceph client
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node. The Ceph iSCSI gateway can be a standalone node or be colocated on
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a Ceph Object Store Disk (OSD) node. Completing the following steps will
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install, and configure the Ceph iSCSI gateway for basic operation.
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**Requirements:**
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- A running Ceph Luminous or later storage cluster
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- RHEL/CentOS 7.5; Linux kernel v4.16 or newer; or the `Ceph iSCSI client test kernel <https://shaman.ceph.com/repos/kernel/ceph-iscsi-test>`_
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- The following packages must be installed from your Linux distribution's software repository:
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- ``targetcli-2.1.fb47`` or newer package
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- ``python-rtslib-2.1.fb64`` or newer package
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- ``tcmu-runner-1.3.0`` or newer package
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- ``ceph-iscsi-config-2.4`` or newer package
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- ``ceph-iscsi-cli-2.5`` or newer package
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.. important::
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If previous versions of these packages exist, then they must
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be removed first before installing the newer versions.
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Do the following steps on the Ceph iSCSI gateway node before proceeding
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to the *Installing* section:
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#. If the Ceph iSCSI gateway is not colocated on an OSD node, then copy
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the Ceph configuration files, located in ``/etc/ceph/``, from a
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running Ceph node in the storage cluster to the iSCSI Gateway node.
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The Ceph configuration files must exist on the iSCSI gateway node
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under ``/etc/ceph/``.
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#. Install and configure the `Ceph Command-line
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Interface <http://docs.ceph.com/docs/master/start/quick-rbd/#install-ceph>`_
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#. If needed, open TCP ports 3260 and 5000 on the firewall.
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#. Create a new or use an existing RADOS Block Device (RBD).
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**Installing:**
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If you are using the upstream ceph-iscsi-cli package follow the
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`manual install instructions`_.
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.. _`manual install instructions`: ../iscsi-target-cli-manual-install
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.. toctree::
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:hidden:
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iscsi-target-cli-manual-install
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For rpm based instructions execute the following commands:
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#. As ``root``, on all iSCSI gateway nodes, install the
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``ceph-iscsi-cli`` package:
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::
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# yum install ceph-iscsi-cli
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#. As ``root``, on all iSCSI gateway nodes, install the ``tcmu-runner``
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package:
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::
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# yum install tcmu-runner
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**Setup:**
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#. gwcli requires a pool with the name ``rbd``, so it can store metadata
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like the iSCSI configuration. To check if this pool has been created
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run:
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::
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# ceph osd lspools
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If it does not exist instructions for creating pools can be found on the
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`RADOS pool operations page
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<http://docs.ceph.com/docs/master/rados/operations/pools/>`_.
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#. As ``root``, on a iSCSI gateway node, create a file named
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``iscsi-gateway.cfg`` in the ``/etc/ceph/`` directory:
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::
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# touch /etc/ceph/iscsi-gateway.cfg
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#. Edit the ``iscsi-gateway.cfg`` file and add the following lines:
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::
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[config]
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# Name of the Ceph storage cluster. A suitable Ceph configuration file allowing
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# access to the Ceph storage cluster from the gateway node is required, if not
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# colocated on an OSD node.
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cluster_name = ceph
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# Place a copy of the ceph cluster's admin keyring in the gateway's /etc/ceph
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# drectory and reference the filename here
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gateway_keyring = ceph.client.admin.keyring
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# API settings.
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# The API supports a number of options that allow you to tailor it to your
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# local environment. If you want to run the API under https, you will need to
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# create cert/key files that are compatible for each iSCSI gateway node, that is
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# not locked to a specific node. SSL cert and key files *must* be called
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# 'iscsi-gateway.crt' and 'iscsi-gateway.key' and placed in the '/etc/ceph/' directory
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# on *each* gateway node. With the SSL files in place, you can use 'api_secure = true'
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# to switch to https mode.
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# To support the API, the bear minimum settings are:
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api_secure = false
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# Additional API configuration options are as follows, defaults shown.
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# api_user = admin
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# api_password = admin
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# api_port = 5001
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# trusted_ip_list = 192.168.0.10,192.168.0.11
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.. note::
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trusted_ip_list is a list of IP addresses on each iscsi gateway that
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will be used for management operations like target creation, lun
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exporting, etc. The IP can be the same that will be used for iSCSI
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data, like READ/WRITE commands to/from the RBD image, but using
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separate IPs is recommended.
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.. important::
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The ``iscsi-gateway.cfg`` file must be identical on all iSCSI gateway nodes.
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#. As ``root``, copy the ``iscsi-gateway.cfg`` file to all iSCSI
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gateway nodes.
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#. As ``root``, on all iSCSI gateway nodes, enable and start the API
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service:
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::
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# systemctl daemon-reload
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# systemctl enable rbd-target-api
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# systemctl start rbd-target-api
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**Configuring:**
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gwcli will create and configure the iSCSI target and RBD images and copy the
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configuration across the gateways setup in the last section. Lower level
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tools, like targetcli and rbd, can be used to query the local configuration,
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but should not be used to modify it. This next section will demonstrate how
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to create a iSCSI target and export a RBD image as LUN 0.
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#. As ``root``, on a iSCSI gateway node, start the iSCSI gateway
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command-line interface:
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::
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# gwcli
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#. Go to iscsi-targets and create a target with the name
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iqn.2003-01.com.redhat.iscsi-gw:iscsi-igw:
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::
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> /> cd /iscsi-target
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> /iscsi-target> create iqn.2003-01.com.redhat.iscsi-gw:iscsi-igw
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#. Create the iSCSI gateways. The IPs used below are the ones that will be
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used for iSCSI data like READ and WRITE commands. They can be the
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same IPs used for management operations listed in trusted_ip_list,
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but it is recommended that different IPs are used.
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::
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> /iscsi-target> cd iqn.2003-01.com.redhat.iscsi-gw:iscsi-igw/gateways
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> /iscsi-target...-igw/gateways> create ceph-gw-1 10.172.19.21
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> /iscsi-target...-igw/gateways> create ceph-gw-2 10.172.19.22
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If not using RHEL/CentOS or using an upstream or ceph-iscsi-test kernel,
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the skipchecks=true argument must be used. This will avoid the Red Hat kernel
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and rpm checks:
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::
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> /iscsi-target> cd iqn.2003-01.com.redhat.iscsi-gw:iscsi-igw/gateways
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> /iscsi-target...-igw/gateways> create ceph-gw-1 10.172.19.21 skipchecks=true
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> /iscsi-target...-igw/gateways> create ceph-gw-2 10.172.19.22 skipchecks=true
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#. Add a RBD image with the name disk_1 in the pool rbd:
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::
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> /iscsi-target...-igw/gateways> cd /disks
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> /disks> create pool=rbd image=disk_1 size=90G
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.. warning::
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There can not be any periods (.) in the pool name or in the image name.
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#. Create a client with the initiator name iqn.1994-05.com.redhat:rh7-client:
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::
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> /disks> cd /iscsi-target/iqn.2003-01.com.redhat.iscsi-gw:iscsi-igw/hosts
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> /iscsi-target...eph-igw/hosts> create iqn.1994-05.com.redhat:rh7-client
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#. Set the client's CHAP username to myiscsiusername and password to
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myiscsipassword:
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::
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> /iscsi-target...at:rh7-client> auth chap=myiscsiusername/myiscsipassword
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.. warning::
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CHAP must always be configured. Without CHAP, the target will
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reject any login requests.
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#. Add the disk to the client:
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::
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> /iscsi-target...at:rh7-client> disk add rbd.disk_1
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The next step is to configure the iSCSI initiators.
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