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2009 年 06 月 20 日技术合集

linux通过ISCSI无盘启动

一、环境

server: HP Athlon 64bit 3500+ | (running ietd,ISC dhcp,pxelinux,tftp-hpa)

client: DELL Latitude | D610 | (running iSCSI initiator Core)

kernel ver 2.6.14.5 , both server & client machines

二、Server Tasks:

  Setup ISC DHCP
  Setup Syslinux (for PXELinux) & TFTP-HPA
  Setup TFTP-HPA
  Setup iSCSI Target (ietd enterprise target)
  • ) Update! you can skip the dhcp,syslinux,tftp steps by running this auto-configurator!
 wget http://linux-iscsi.org/iscsiboot/server-scripts/pxeserver-setup.sh

三、Client Tasks:

  Setup iSCSI initiator (iSCSI initiator Core)
  Boot time

四、Setup ISC DHCP http://ftp.isc.org/isc/dhcp/dhcp-3.0.3.tar.gz

edit /etc/dhcp/dhcpd.conf

 allow booting;
 allow bootp;
 option routers 192.168.1.6;
 option subnet-mask 255.255.255.0;
 ddns-update-style ad-hoc;
 subnet 192.168.1.0 netmask 255.255.255.0 {
    range 192.168.1.111 192.168.1.115;
 }
 group {
    next-server 192.168.1.6;
    filename "pxelinux.0";
    host laptop-eth0 {
        hardware ethernet 00:00:00:00:00:00; (replace with your mac-address)
 }

五、Setup PXELinux http://kernel.org/pub/linux/utils/boot/syslinux/syslinux-3.11.tar.gz

1) untar syslinux, make && make install

2) untar tftp-hpa, make && make install

  mkdir -p /tftproot/pxelinux.cfg
  cp pxelinux.0 /tftproot
  • ) build a kernel for your client and cp to /tftproot/
  • ) make an initrd and cp to /tftproot

edit /tftproot/pxelinux.cfg/default

  TIMEOUT 50
  PROMPT 1
  LABEL iscsiboot
  KERNEL vmlinuzLaptop
  APPEND root=/dev/ram initrd=bblinux25M
  IPAPPEND 1
  LABEL disk
  LOCALBOOT 0

六、Setup TFTP-HPA http://www.kernel.org/pub/software/network/tftp/tftp-hpa-0.41.tar.gz

  tar zxvf tftp-hpa-0.41.tar.gz
  cd tftp-hpa-0.41
  ./configure
  make
  make install
  • ) Start tftpd: /sbin/in.tftpd -l -v -s /tftproot

Setup iSCSI Target

1) download ietd

  svn export svn://svn.berlios.de/iscsitarget/trunk
  cd trunk && make KERNELSRC=/usr/src/linux && make KERNELSRC=/usr/src/linux install

2) make some test disk.

  ie: dd if=/dev/zero of=/iscsi-diska bs=4096k count=1024

3) configure your new LUN in /etc/ietd.conf

  Target laptop:diska
  Lun 0 Path=/iscsi-diska,Type=fileio
  Alias dell
  DataPDUInOrder Yes
  DataSequenceInOrder Yes

4) start ietd

  /etc/init.d/iscsi-target start

(client side installation notes)

七、Setup iSCSI initiator Core

1) download core-iscsi-tools

http://kernel.org/pub/linux/utils/storage/iscsi/core-iscsi-tools-v3.3.tar.bz2

2) download core-iscsi

http://kernel.org/pub/linux/kernel/people/nab/iscsi-initiator-core/core-iscsi-v1.6.2.5.tar.bz2

3) compile core-iscsi

  make initiator KERNEL_DIR=/usr/src/linux && make install

4) compile core-iscsi-tools

  make install

iSCSI core stack is then loadable via iscsi_initiator_mod.ko,

core tools rely upon /etc/sysconfig/initiator

  CHANNEL="0 2 eth0 192.168.55.6 3260 0"

and /etc/sysconfig/iscsi_device_maps

  DEVICE="0 0 1 diska"

八、Boot time

1) Change bios on client to pxeboot before HD

2) at the pxelinux prompt, type iscsiboot (referring to label in pxelinux.cfg/default)

after successfully booting, do something like this:

  /bin/mount / -o rw,remount
  /bin/mount -t proc none /proc
  /bin/mount -o sysfs /sys
  /sbin/ifconfig eth0 192.168.1.92 255.255.255.0
  cd /dev && /bin/mknod sdb1 b 8 17
  NAME=$(/sbin/initiator-iname)
  echo "InitiatorName=$NAME" > /etc/initiatorname.iscsi
  /etc/rc.d/init.d/initiator start
  • ) If this is a new installation, partition and create a file system, then copy minimal files to your new disk
  /bin/fdisk /dev/sdb # (create partition)
  /bin/mke2fs /dev/sdb1
  /bin/mount /dev/sdb1 /laptop:diska
  cp -dpRav /bin /sbin /dev /etc /var /lib /usr /tmp /laptop:diska
  • ) And, lastly:
  /bin/chroot /laptop:diska /bin/bash

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