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sanboot:centos_iscsi_install [2008/02/20 15:28] mcb30 created |
sanboot:centos_iscsi_install [2008/02/20 16:08] (current) mcb30 |
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| ====== Installing CentOS to an iSCSI target ====== | ====== Installing CentOS to an iSCSI target ====== | ||
| - | The CentOS installation process is somewhat fragile, and the built-in support for iSCSI installation does not function properly. However, it is possible to work around this limitation and install to an iSCSI target. | + | The CentOS installation process is somewhat fragile, and the built-in support for iSCSI installation does not function properly (except in very limited circumstances). However, it is possible to work around this limitation and install to an iSCSI target. |
| ===== Starting the installation ===== | ===== Starting the installation ===== | ||
| - | Start a CentOS installation in the usual way, and proceed up to the point of the graphical welcome screen: | + | Start a CentOS installation in the usual way, and proceed up to the point of the partitioning screen: |
| - | {{screenshots:centos_iscsi_install_start.png?400x300|Start of CentOS installation}} | + | {{ screenshots:centos_iscsi_install_partitioning.png?400x300 |CentOS partitioning screen}} |
| - | Before clicking on //Next//, press //Ctrl-Alt-F2//. This should take you to a root shell prompt. Configure and start up the iSCSI initiator: | + | Click on //Advanced storage configuration//, and add an iSCSI target. For the target IP address, enter //127.0.0.1//: |
| - | sh-3.2# mkdir /etc/iscsi | + | {{ screenshots:centos_iscsi_install_gui_add_target.png?400x300 |CentOS iSCSI installation GUI}} |
| - | + | ||
| - | sh-3.2# echo InitiatorName=iqn.2007-08.name.dns.initiator.my > \ | + | |
| - | /etc/iscsi/initiatorname.iscsi | + | |
| - | + | ||
| - | sh-3.2# iscsid | + | |
| - | {{ screenshots:centos_iscsi_install_connect.png?320x200|CentOS iSCSI installation connection to disk}} | + | You will see the message "Initializing iSCSI initiator" appear for several seconds, then the display will return to the partitioning screen. |
| - | + | ||
| - | where //name.dns.initiator.my// is your initiator's DNS name in reverse order. (For completeness, you should also replace //2007-08// with the year and month in which you first obtained your DNS domain. The iSCSI naming schemes are somewhat pedantic, but it won’t affect anything in practice; as long as the initiator name is unique then everything will work just fine.) | + | |
| ===== Connecting to the iSCSI target ===== | ===== Connecting to the iSCSI target ===== | ||
| - | Connect to the iSCSI target to be used for installation: | + | {{ screenshots:centos_iscsi_install_connect.png?320x200|CentOS iSCSI installation connection to disk}} |
| + | |||
| + | Press //Ctrl-Alt-F2//. This should take you to a root shell prompt. Connect to the iSCSI target to be used for installation: | ||
| sh-3.2# iscsiadm -m discovery -t sendtargets -p my.target.dns.name:3260 | sh-3.2# iscsiadm -m discovery -t sendtargets -p my.target.dns.name:3260 | ||
| Line 38: | Line 33: | ||
| ===== Completing the installation ===== | ===== Completing the installation ===== | ||
| - | Press //Ctrl-Alt-F6// to return to the graphical installation process, and click on //Next// to proceed to the disk selection screen: | + | Press //Ctrl-Alt-F6// to return to the graphical installation process. Click on //Back//. This will cause the installer to rescan for disks, and the iSCSI target should now show up in the list of available disks: |
| - | + | ||
| - | {{screenshots:centos_iscsi_install_select_drive.png?400x300|CentOS iSCSI installation disk selection}} | + | |
| - | + | ||
| - | You must tick the "Review and modify partitioning layout" box before proceeding to the disk partitioning screen: | + | |
| - | {{screenshots:centos_iscsi_install_remove_swap.png?400x300|CentOS iSCSI installation swap removal}} | + | {{ screenshots:centos_iscsi_install_partitioning_recap.png?400x300 |CentOS partitioning screen}} |
| - | Select and delete the swap partition. This is required for two reasons: firstly, swap over iSCSI (or over any network device) is generally a bad idea; secondly, doing so works around a bug in the CentOS installer which would otherwise result in the partition table never being written to disk. | + | Continue with the rest of the installation as usual. |
| Make a note of the iSCSI target IQN that you installed to (//iqn.2007-08.name.dns.target.my:iscsiboot// in the above example). You are now ready to | Make a note of the iSCSI target IQN that you installed to (//iqn.2007-08.name.dns.target.my:iscsiboot// in the above example). You are now ready to | ||
