mirror of https://github.com/ceph/ceph
120 lines
3.2 KiB
ReStructuredText
120 lines
3.2 KiB
ReStructuredText
-------------------------
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iSCSI Initiator for Linux
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-------------------------
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**Prerequisite:**
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- Package ``iscsi-initiator-utils``
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- Package ``device-mapper-multipath``
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**Installing:**
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Install the iSCSI initiator and multipath tools:
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.. prompt:: bash #
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yum install iscsi-initiator-utils
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yum install device-mapper-multipath
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**Configuring:**
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#. Create the default ``/etc/multipath.conf`` file and enable the
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``multipathd`` service:
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.. prompt:: bash #
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mpathconf --enable --with_multipathd y
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#. Add the following to the ``/etc/multipath.conf`` file:
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::
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devices {
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device {
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vendor "LIO-ORG"
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product "TCMU device"
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hardware_handler "1 alua"
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path_grouping_policy "failover"
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path_selector "queue-length 0"
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failback 60
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path_checker tur
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prio alua
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prio_args exclusive_pref_bit
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fast_io_fail_tmo 25
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no_path_retry queue
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}
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}
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#. Restart the ``multipathd`` service:
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.. prompt:: bash #
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systemctl reload multipathd
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**iSCSI Discovery and Setup:**
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#. Enable CHAP authentication and provide the initiator CHAP username
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and password by uncommenting and setting the following options in
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the ``/etc/iscsi/iscsid.conf`` file:
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::
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node.session.auth.authmethod = CHAP
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node.session.auth.username = myusername
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node.session.auth.password = mypassword
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If you intend to use mutual (bidirectional) authentication, provide the
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target CHAP username and password:
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::
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node.session.auth.username_in = mytgtusername
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node.session.auth.password_in = mytgtpassword
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#. Discover the target portals:
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.. prompt:: bash #
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iscsiadm -m discovery -t st -p 192.168.56.101
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::
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192.168.56.101:3260,1 iqn.2003-01.org.linux-iscsi.rheln1
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192.168.56.102:3260,2 iqn.2003-01.org.linux-iscsi.rheln1
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#. Log in to the target:
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.. prompt:: bash #
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iscsiadm -m node -T iqn.2003-01.org.linux-iscsi.rheln1 -l
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**Multipath IO Setup:**
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#. The multipath daemon (``multipathd``) uses the ``multipath.conf`` settings
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to set up devices automatically. Running the ``multipath`` command shows
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that the devices have been set up in a failover configuration. Notice that
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each path has been placed into its own priority group:
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.. prompt:: bash #
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multipath -ll
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::
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mpathbt (360014059ca317516a69465c883a29603) dm-1 LIO-ORG ,IBLOCK
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size=1.0G features='0' hwhandler='1 alua' wp=rw
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|-+- policy='queue-length 0' prio=50 status=active
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| `- 28:0:0:1 sde 8:64 active ready running
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`-+- policy='queue-length 0' prio=10 status=enabled
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`- 29:0:0:1 sdc 8:32 active ready running
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You should now be able to use the RBD image in the same way that you would
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use a normal multipath iSCSI disk.
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#. Log out of the target:
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.. prompt:: bash #
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iscsiadm -m node -T iqn.2003-01.org.linux-iscsi.rheln1 -u
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