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Paul Cobbaut
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minor storage corrections? forgot what this was...
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‎modules/storage_iscsi/030_diskiscsi_theory.xml‎

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@@ -349,3 +349,178 @@ root@ubu1104:/etc/iscsi/nodes# mount | grep is
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/dev/sdc1 on /mnt/is2 type ext3 (rw)
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/dev/sdd1 on /mnt/is3 type ext4 (rw)</screen>
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</section>
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<?hard-pagebreak?>
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<section><title>iSCSI Target RHEL7/CentOS7</title>
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<para>The prefered tool to setup an iSCSI Target on RHEL is <command>targetcli</command>.</para>
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<screen>[root@centos7 ~]# <command>yum install targetcli</command>
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Loaded plugins: fastestmirror
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...
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...
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Installed:
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targetcli.noarch 0:2.1.fb37-3.el7
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Complete!
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[root@centos7 ~]#</screen>
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<para>The <command>targetcli</command> tool is interactive and represents the configuration fo the <command>target</command> in a structure that resembles a directory tree with several files. Although this is explorable inside <command>targetcli</command> with <command>ls</command>, <command>cd</command> and <command>pwd</command>, this are not files on the file system.</para>
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<para>This tool also has tab-completion, which is very handy for the <command>iqn</command> names.</para>
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<screen>[root@centos7 ~]# <command>targetcli</command>
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targetcli shell version 2.1.fb37
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Copyright 2011-2013 by Datera, Inc and others.
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For help on commands, type 'help'.
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/> <command>cd backstores/</command>
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/backstores> <command>ls</command>
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o- backstores ............................................................ [...]
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o- block ................................................ [Storage Objects: 0]
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o- fileio ............................................... [Storage Objects: 0]
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o- pscsi ................................................ [Storage Objects: 0]
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o- ramdisk .............................................. [Storage Objects: 0]
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/backstores> <command>cd block</command>
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/backstores/block> <command>ls</command>
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o- block .................................................. [Storage Objects: 0]
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/backstores/block> <command>create server1.disk1 /dev/sdb</command>
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Created block storage object server1.disk1 using /dev/sdb.
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/backstores/block> <command>ls</command>
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o- block .................................................. [Storage Objects: 1]
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o- server1.disk1 .................. [/dev/sdb (2.0GiB) write-thru deactivated]
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/backstores/block> <command>cd /iscsi</command>
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/iscsi> <command>create iqn.2015-04.be.linux:iscsi1</command>
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Created target iqn.2015-04.be.linux:iscsi1.
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Created TPG 1.
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Global pref auto_add_default_portal=true
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Created default portal listening on all IPs (0.0.0.0), port 3260.
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/iscsi> <command>cd /iscsi/iqn.2015-04.be.linux:iscsi1/tpg1/acls</command>
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/iscsi/iqn.20...si1/tpg1/acls> <command>create iqn.2015-04.be.linux:server2</command>
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Created Node ACL for iqn.2015-04.be.linux:server2
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/iscsi/iqn.20...si1/tpg1/acls> <command>cd iqn.2015-04.be.linux:server2</command>
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/iscsi/iqn.20...linux:server2> <command>set auth userid=paul</command>
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Parameter userid is now 'paul'.
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/iscsi/iqn.20...linux:server2> <command>set auth password=hunter2</command>
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Parameter password is now 'hunter2'.
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/iscsi/iqn.20...linux:server2> <command>cd /iscsi/iqn.2015-04.be.linux:iscsi1/tpg1/luns</command>
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/iscsi/iqn.20...si1/tpg1/luns> <command>create /backstores/block/server1.disk1</command>
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Created LUN 0.
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Created LUN 0->0 mapping in node ACL iqn.2015-04.be.linux:server2
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s/scsi/iqn.20...si1/tpg1/luns> <command>cd /iscsi/iqn.2015-04.be.linux:iscsi1/tpg1/portals</command>
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/iscsi/iqn.20.../tpg1/portals> <command>create 192.168.1.128</command>
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Using default IP port 3260
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Could not create NetworkPortal in configFS.
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/iscsi/iqn.20.../tpg1/portals> <command>cd /</command>
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/> <command>ls</command>
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o- / ..................................................................... [...]
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o- backstores .......................................................... [...]
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| o- block .............................................. [Storage Objects: 1]
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| | o- server1.disk1 ................ [/dev/sdb (2.0GiB) write-thru activated]
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| o- fileio ............................................. [Storage Objects: 0]
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| o- pscsi .............................................. [Storage Objects: 0]
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| o- ramdisk ............................................ [Storage Objects: 0]
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o- iscsi ........................................................ [Targets: 1]
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| o- iqn.2015-04.be.linux:iscsi1 ................................... [TPGs: 1]
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| o- tpg1 ........................................... [no-gen-acls, no-auth]
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| o- acls ...................................................... [ACLs: 1]
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| | o- iqn.2015-04.be.linux:server2 ..................... [Mapped LUNs: 1]
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| | o- mapped_lun0 ..................... [lun0 block/server1.disk1 (rw)]
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| o- luns ...................................................... [LUNs: 1]
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| | o- lun0 ............................. [block/server1.disk1 (/dev/sdb)]
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| o- portals ................................................ [Portals: 1]
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| o- 0.0.0.0:3260 ................................................. [OK]
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o- loopback ..................................................... [Targets: 0]
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/> <command>saveconfig</command>
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Last 10 configs saved in /etc/target/backup.
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Configuration saved to /etc/target/saveconfig.json
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/> <command>exit</command>
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Global pref auto_save_on_exit=true
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Last 10 configs saved in /etc/target/backup.
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Configuration saved to /etc/target/saveconfig.json
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[root@centos7 ~]#</screen>
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<para>Use the <command>systemd</command> tools to manage the service:</para>
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<screen>[root@centos7 ~]# <command>systemctl enable target</command>
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ln -s '/usr/lib/systemd/system/target.service' '/etc/systemd/system/multi-user.target.wants/target.service'
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[root@centos7 ~]# <command>systemctl start target</command>
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[root@centos7 ~]#</screen>
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<para>Depending on your organisations policy, you may need to configure firewall and SELinux. The screenshot belows adds a firewall rule to allow all traffic over port 3260, and disables SELinux.</para>
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<screen>[root@centos7 ~]# <command>firewall-cmd --permanent --add-port=3260/tcp</command>
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[root@centos7 ~]# <command>firewall-cmd --reload</command>
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[root@centos7 ~]# <command>setenforce 0</command></screen>
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<para>The total configuration is visible using <command>ls</command> from the root.</para>
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<screen>[root@centos7 ~]# <command>targetcli</command>
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targetcli shell version 2.1.fb37
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Copyright 2011-2013 by Datera, Inc and others.
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For help on commands, type 'help'.
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/> <command>ls</command>
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o- / ..................................................................... [...]
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o- backstores .......................................................... [...]
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| o- block .............................................. [Storage Objects: 1]
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| | o- server1.disk1 ................ [/dev/sdb (2.0GiB) write-thru activated]
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| o- fileio ............................................. [Storage Objects: 0]
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| o- pscsi .............................................. [Storage Objects: 0]
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| o- ramdisk ............................................ [Storage Objects: 0]
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o- iscsi ........................................................ [Targets: 1]
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| o- iqn.2015-04.be.linux:iscsi1 ................................... [TPGs: 1]
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| o- tpg1 ........................................... [no-gen-acls, no-auth]
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| o- acls ...................................................... [ACLs: 1]
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| | o- iqn.2015-04.be.linux:server2 ..................... [Mapped LUNs: 1]
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| | o- mapped_lun0 ..................... [lun0 block/server1.disk1 (rw)]
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| o- luns ...................................................... [LUNs: 1]
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| | o- lun0 ............................. [block/server1.disk1 (/dev/sdb)]
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| o- portals ................................................ [Portals: 1]
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| o- 0.0.0.0:3260 ................................................. [OK]
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o- loopback ..................................................... [Targets: 0]
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/>
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/> <command>exit</command>
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Global pref auto_save_on_exit=true
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Last 10 configs saved in /etc/target/backup.
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Configuration saved to /etc/target/saveconfig.json
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[root@centos7 ~]#</screen>
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<para>The iSCSI Target is now ready.</para>
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</section>
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<section><title>iSCSI Initiator RHEL7/CentOS7</title>
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<para>This is identical to the RHEL6/CentOS6 procedure:</para>
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<screen>[root@centos7 ~]# <command>yum install iscsi-initiator-utils</command>
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Loaded plugins: fastestmirror
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...
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...
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Installed:
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iscsi-initiator-utils.x86_64 0:6.2.0.873-29.el7
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Dependency Installed:
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iscsi-initiator-utils-iscsiuio.x86_64 0:6.2.0.873-29.el7
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Complete!</screen>
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<para>Map your initiator name to the <command>targetcli</command> acl.</para>
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<screen>[root@centos7 ~]# <command>cat /etc/iscsi/initiatorname.iscsi</command>
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InitiatorName=iqn.2015-04.be.linux:server2
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[root@centos7 ~]#</screen>
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<para>Enter the CHAP authentication in <command>/etc/iscsi/iscsid.conf</command>.</para>
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<screen>[root@centos7 ~]# <command>vi /etc/iscsi/iscsid.conf</command>
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...
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[root@centos7 ~]# <command>grep ^node.session.auth /etc/iscsi/iscsid.conf</command>
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node.session.auth.authmethod = CHAP
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node.session.auth.username = paul
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node.session.auth.password = hunter2
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[root@centos7 ~]#</screen>
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<para>There are no extra devices yet...</para>
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<screen>[root@centos7 ~]# <command>fdisk -l | grep sd</command>
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Disk /dev/sda: 22.0 GB, 22038806528 bytes, 43044544 sectors
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/dev/sda1 * 2048 1026047 512000 83 Linux
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/dev/sda2 1026048 43042815 21008384 8e Linux LVM
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Disk /dev/sdb: 2147 MB, 2147483648 bytes, 4194304 sectors</screen>
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<para>Enable the service and discover the target.</para>
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<screen>[root@centos7 ~]# <command>systemctl enable iscsid</command>
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ln -s '/usr/lib/systemd/system/iscsid.service' '/etc/systemd/system/multi-user.target.wants/iscsid.service'
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[root@centos7 ~]# <command>iscsiadm -m discovery -t st -p 192.168.1.128</command>
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192.168.1.128:3260,1 iqn.2015-04.be.linux:iscsi1</screen>
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<para>Log into the target and see /dev/sdc appear.</para>
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<screen>[root@centos7 ~]# <command>iscsiadm -m node -T iqn.2015-04.be.linux:iscsi1 -p 192.168.1.128 -l</command>
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Logging in to [iface: default, target: iqn.2015-04.be.linux:iscsi1, portal: 192.168.1.128,3260] (multiple)
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Login to [iface: default, target: iqn.2015-04.be.linux:iscsi1, portal: 192.168.1.128,3260] successful.
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[root@centos7 ~]#
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[root@centos7 ~]# <command>fdisk -l | grep sd</command>
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Disk /dev/sda: 22.0 GB, 22038806528 bytes, 43044544 sectors
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/dev/sda1 * 2048 1026047 512000 83 Linux
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/dev/sda2 1026048 43042815 21008384 8e Linux LVM
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Disk /dev/sdb: 2147 MB, 2147483648 bytes, 4194304 sectors
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Disk /dev/sdc: 2147 MB, 2147483648 bytes, 4194304 sectors
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[root@centos7 ~]# </screen>
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</section>

‎modules/storage_iscsi/040_diskiscsi_practice.xml‎

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<?hard-pagebreak?>
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<section><title>practice: iSCSI devices</title>
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<para>1. Set up a target (using an LVM and a SCSI device) and an initiator that connects to both.</para>
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<para>2. Set up an iSCSI Target and Initiator on two CentOS7/RHEL7 computers with the following information:</para>
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<table frame='all'><title>iSCSI Target and Initiator practice</title>
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<?dbfo table-width="80%" ?>
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<tgroup cols='2' align='center' colsep='1' rowsep='1'>
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<colspec colname='c1' colwidth="1*" align="left"/>
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<colspec colname='c2' colwidth="1*" align="left"/>
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<thead>
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<row>
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<entry>variable</entry>
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<entry>value</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>Target Server IP</entry>
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<entry></entry>
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</row>
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<row>
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<entry>shared devices on target</entry>
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<entry>/dev/sd /dev/sd /dev/sd </entry>
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</row>
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<row>
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<entry>shared device name sd </entry>
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<entry></entry>
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</row>
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<row>
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<entry>shared device name sd </entry>
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<entry></entry>
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</row>
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<row>
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<entry>shared device name sd </entry>
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<entry></entry>
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</row>
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<row>
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<entry>target iqn</entry>
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<entry></entry>
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</row>
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<row>
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<entry>initiator iqn</entry>
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<entry></entry>
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</row>
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<row>
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<entry>username</entry>
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<entry></entry>
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</row>
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<row>
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<entry>password</entry>
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<entry></entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</section>

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