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--- sanboot:gentoo_iscsi [2010/01/23 09:08]
gruffi created
+++ sanboot:gentoo_iscsi [2010/10/26 07:18] (current)
ctr formating
@@ Line 2: / Line 2: @@
 =====  Scope  =====
 This How-To is intended for anyone who wants to install Gentoo Linux on an iSCSI target.
-  * What is not covered
+== What is covered: ==
-    * Understanding and configuring a network environment
+    * Connecting to the iSCSI target
-  * What is covered
-    * Conecting to the iSCSI target
     * Installing a generic base system
     * Installing the kernel
     * Installing the bootloader
+== What is not covered: ==
+    * Understanding and configuring a network environment
 =====  Credits  =====
@@ Line 14: / Line 14: @@
 The following pages proved to be a great resource of information:
-http:<nowiki>//</nowiki>etherboot.org/wiki/sanboot/ubuntu_iscsi (installing ubuntu on iscsi)
+  * http://etherboot.org/wiki/sanboot/ubuntu_iscsi (installing ubuntu on iscsi)
-http:<nowiki>//</nowiki>www.gentoo-wiki.info/ISCSI (examples how to use open-iscsi on gentoo)
+  * http://www.gentoo-wiki.info/ISCSI (examples how to use open-iscsi on gentoo)
-http:<nowiki>//</nowiki>www.mail-archive.com/open-iscsi@googlegroups.com/msg00736.html (a bug that kept me bussy for a while)
+  * http://www.mail-archive.com/open-iscsi@googlegroups.com/msg00736.html (a bug that kept me busy for a while)
 ======  Installation  ======
-=====  Connect to your iscsi disk  =====
+=====  Connect to your iSCSI disk  =====
-====  Method 1: use (x)ubuntu boot cd (safest)  ====
+====  Method 1: use (x)ubuntu boot CD (safest)  ====
 (I've only tried this with xubuntu, but other ubuntu versions should work as well.)
-This is by far the safest way to install, since you are booting from the live-cd, why not just disconnect all your harddrives to avoid mistakes?
+This is by far the safest way to install, since you are booting from the live-cd. Why not just disconnect all your hard drives to avoid mistakes?
 ===  Install open-iscsi  ===
@@ Line 32: / Line 32: @@
  sudo aptitude install open-iscsi</code>
-===  Discover your iscsi target  ===
+===  Discover your iSCSI target  ===
 <code>
  sudo iscsi_discovery <SAN-IP></code>
@@ Line 44: / Line 44: @@
  sudo iscsiadm -m node -p <SAN-IP> -T iqn.1986-03.com.sun:02:86afa64e-9baf-451c-84bb-826ea71300db.gentootest -l</code>
-You should see something simmilar to:
+You should see something similar to:
 <code>
  Logging in to [[iface:|default, target: iqn.1986-03.com.sun:02:86afa64e-9baf-451c-84bb-826ea71300db.gentootest, portal: 10.9.8.250,3260]]
@@ Line 52: / Line 52: @@
 ===  Update kernel  ===
-Make sure your current kernel supports iscsi:
+Make sure your current kernel supports iSCSI:
 Roll a new kernel if necessary.
-I had trouble when CRC32c was compiled as M so i made it *.
+  * I had trouble when CRC32c was compiled as a module, but it worked when built-in.
+  * Open-iscsi will not start when ''iSCSI Initiator over TCP/IP'' is built-in, so you have to make it a module for now.
-Open-iscsi will not start when iSCSI Initiator over TCP/IP is * so you have to make it M for now.
+  * Open-iscsi will not start when ''iSCSI Transport Attributes'' is built-in, so you have to make it a module for now.
-Open-iscsi will not start when iSCSI Transport Attributes is * so you have to make it M for now.
 <code>
@@ Line 84: / Line 83: @@
  * Loading iSCSI modules ...
  * Loading libiscsi: not found ...                                        [[|!! ]]</code>
-then you have to addapt your kernel:
+then you have to adapt your kernel:
 <code>
  <M>   iSCSI Initiator over TCP/IP
@@ Line 103: / Line 102: @@
 ===  Discover your iscsi-target  ===
-Find the mac-adres of your network card:
+Find the MAC address of your network card:
 <code>
  ifconfig eth0 | grep HWaddr</code>
@@ Line 135: / Line 134: @@
 You should see something like:
 <code>
- Logging	in to [[iface:|iface0, target: iqn.1986-03.com.sun:02:86afa64e-9baf-451c-84bb-826ea71300db.gentootest, portal: 10.9.8.250,3260]]
+ Logging in to [[iface:|iface0, target: iqn.1986-03.com.sun:02:86afa64e-9baf-451c-84bb-826ea71300db.gentootest, portal: 10.9.8.250,3260]]
  Login to [[iface:|iface0, target: iqn.1986-03.com.sun:02:86afa64e-9baf-451c-84bb-826ea71300db.gentootest, portal: 10.9.8.250,3260]]: successful</code>
-=====  Chroot into your iscsi-disk  =====
+=====  Chroot into your iSCSI disk  =====
 (Make sure you are root from now on)
 ===  Find out where the disk is attached to  ===
-(In this case the "disk" is a file filled with zeroes, so fdisk will complain there is no valid partition table, it does not matter.)
+(In this case the "disk" is a file filled with zeroes, so fdisk will complain there is no valid partition table. It does not matter.)
 <code>
  fdisk -l</code>
-You should see something simillar to:
+You should see something similar to:
 <code>
  Disk /dev/sda: 4194 MB, 4194304000 bytes
@@ Line 158: / Line 157: @@
 **WARNING: Pay attention to what device your iscsi disk is attached, if you don't have other disks connected to your computer the device will probably be /dev/sda, if you do have other disks you have to find out what device your iscsi disk is connected to! You don't want to (re)format the wrong disk! I will refer to the disk as /dev/sdX.**
-===  Partition the iscsi-harddisk  ===
+===  Partition the iSCSI disk  ===
-(i've made only 1 partition to make it simple, you could add boot and swap if you want)
+(I've made only 1 partition to make it simple. You could add boot and swap if you want)
 <code>
  fdisk /dev/sdX</code>
@@ Line 172: / Line 171: @@
  mkdir /mnt/gentoo</code>
-===  Mount your iscsi-disk  ===
+===  Mount your iSCSI disk  ===
 <code>
  mount /dev/sdX1 /mnt/gentoo</code>
-=====  Install Gentoo Base-system  =====
+=====  Install Gentoo base system  =====
 From here on you have to download a stage3 just like you would in a normal installation. Unpack the stage in /mnt/gentoo.
@@ Line 212: / Line 211: @@
 ====  Network configuration  ====
-**IMPORTANT:** Since your storage is connected over the network do not allow init scripts to start or restart the network!
+**IMPORTANT:** Since your storage is connected over the network, do not allow init scripts to start or restart the network!
 <code>
@@ Line 221: / Line 220: @@
 ====  Fstab  ====
-Add your harddisk in fstab like any normal harddisk:
+Add your iSCSI disk in fstab like any normal hard disk:
 <code>
  nano -w /etc/fstab</code>
@@ Line 239: / Line 238: @@
 ====  Compile the sources with genkernel  ====
-Dont forget to add --iscsi for iscsi support.
+Don't forget to add --iscsi for iscsi support.
 <code>
  genkernel --menuconfig --iscsi all</code>
-===  Enable (i)scsi  ===
+===  Enable iSCSI  ===
 I had trouble when CRC32c was compiled as M so i made it *.
@@ Line 283: / Line 282: @@
 =====  Install Bootloader  =====
-==== Install grub  ====
+==== Install GRUB  ====
 <code>
  emerge sys-boot/grub</code>
-====  Configure Grub  ====
+====  Configure GRUB  ====
 <code>
  grub</code>
-**WARNING, WARNING, WARNING: make sure you enter the right disk!! if you are running the ubuntu-cd and don't have any real harddisks connected to your computer then hdx=hd0, if you are installing from a real harddisk then hdX=hd1 or hd2 or so on!!!
+**WARNING, WARNING, WARNING: make sure you enter the right disk!! if you are running the ubuntu-cd and don't have any real harddisks connected to your computer then hdx=hd0, if you are installing from a real hard disk then hdX=hd1 or hd2 or so on!!!
 **
 <code>
@@ Line 298: / Line 297: @@
  quit</code>
-====  Edit grub configuration  ====
+====  Edit GRUB configuration  ====
-You have to set at least these options for iscsi to work:
+You have to set at least these options for iSCSI to work:
 ip=dhcp, iscsi_target=, iscsi_address=, iscsi_initiatorname ======
@@ Line 319: / Line 318: @@
  cd ~
  exit</code>
-If you dont' have a boot partition like me then you can leave out /mnt/gentoo/boot
+If you don't have a boot partition like me, then you can leave out /mnt/gentoo/boot
 <code>
  umount /mnt/gentoo/dev /mnt/gentoo/proc /mnt/gentoo/boot /mnt/gentoo</code>
-======  Troubeshooting  ======
+======  Troubleshooting  ======
 =====  Made a mistake in the base system  =====
-You can connect to your iscsi disk again with one of the methods above, chroot and fix the problem.
+You can connect to your iSCSI disk again with one of the methods above, chroot and fix the problem.
 =====  System won't boot and drops you in a shell  =====
 Enter the shell and try to figure out what went wrong.
-  * Did the network interface come up with an ip-adres?
+  * Did the network interface come up with an ip-address?
 <code>
  ifconfig eth0</code>
-You may have forgotten to enable the kernel ip autoconfiguration and the kernel dhcp
+  * You may have forgotten to enable ''IP: kernel level  autoconfiguration'' and/or DHCP in the kernel
+  * You may have forgotten to enable your network card in the kernel (* not M)
-You may have forgotten to enable your network card in the kernel (* not M)
   * Does dmesg show any warnings?
 <code>
@@ Line 353: / Line 350: @@
  reboot</code>
 =====  Kernel boots but hangs/crashes when it tries to bring up eth0  =====
-You cannot allow the system to start or restart the network connection, this will severa your iscsi connection!
+You cannot allow the system to start or restart the network connection, this will sever your iscsi connection!
 <code>
  mount  -o remount rw /
@@ Line 366: / Line 363: @@
 =====  Boot fails when adding other storage to computer  =====
-If you add a harddisk, usb drive, usb-stick to the computer it will probably take the /dev/sda spot and your iscsi-disk will move to /dev/sdb or, /dev/sdc, or so on...
+If you add a hard disk/USB drive/USB stick/etc. to the computer, it will probably take the /dev/sda spot and your iSCSI disk will be moved to /dev/sdb or /dev/sdc, etc. Using filesystem labels will help in this situation.
+=====  Gentoo will not shut down properly  =====
+Because an iscsi mount is not recognized as netmount (like nfs) by Gentoo, the system will try to shutdown the network interface during normal shutdown/reboot procedure. This will obviously break the iscsi connection and let the system hang.
+To avoid this the following workaround can be used
+add (where eth0 is the interface being used for the iscsi connection):
+<code>
+/etc/init.d/net.eth0 zap</code>
-======  FIXME  ======
+to /etc/init.d/local.start (or the start section of /etc/init.d/local depending on your baselayout version).
-Gentoo will not shut down properly.
+Doing so will make Gentoo think eth0 is already down, so it wont try to shut it down on halt. All other init-scripts that depend on net will still be invoked to shut them down cleanly, just eth0 itself wont be stopped.

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