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sanboot:centos_iscsi_install [2008/02/20 15:42]
mcb30
sanboot:centos_iscsi_install [2008/02/20 16:08]
mcb30
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-====== Installing CentOS to an iSCSI target ====== 
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-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. 
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-===== Starting the installation ===== 
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-Start a CentOS installation in the usual way, and proceed up to the point of the partitioning screen: 
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-{{ screenshots:​centos_iscsi_install_partitioning.png?​400x300 |CentOS partitioning screen}} 
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-Click on //Advanced storage configuration//,​ and add an iSCSI target. ​ For the target IP address, enter //​127.0.0.1//:​ 
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-{{ screenshots:​centos_iscsi_install_gui_add_target.png?​400x300 |CentOS iSCSI installation GUI}} 
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-You will see the message "​Initializing iSCSI initiator"​ appear for several seconds, then the display will return to the partitioning screen. 
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-{{ screenshots:​centos_iscsi_install_connect.png?​320x200|CentOS iSCSI installation connection to disk}} 
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-===== Connecting to the iSCSI target ===== 
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-Press //​Ctrl-Alt-F2//​. ​ This should take you to a root shell prompt. ​ Connect to the iSCSI target to be used for installation:​ 
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-    sh-3.2# iscsiadm -m discovery -t sendtargets -p my.target.dns.name:​3260 
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-where //​my.target.dns.name//​ is the DNS name (or IP address) of your iSCSI target. ​ You will see a list of available target IQNs.  Log in to the installation target: 
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-    sh-3.2# iscsiadm -m node -T iqn.2007-08.name.dns.target.my:​iscsiboot -l 
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-where //​iqn.2007-08.name.dns.target.my:​iscsiboot//​ is the IQN of the target that you want to install to. 
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-You are now logged in to the installation iSCSI target. 
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-===== Completing the installation ===== 
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-Press //​Ctrl-Alt-F6//​ to return to the graphical installation process, and click on //Next// to proceed to the disk selection screen: 
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-{{screenshots:​centos_iscsi_install_select_drive.png?​400x300|CentOS iSCSI installation disk selection}} 
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-You must tick the "​Review and modify partitioning layout"​ box before proceeding to the disk partitioning screen: 
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-{{screenshots:​centos_iscsi_install_remove_swap.png?​400x300|CentOS iSCSI installation swap removal}} 
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-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. 
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-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 
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-  * [[sanboot:​iscsi_boot|Boot from your iSCSI target image]] 
  

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