I'm attempting to setup a system without a hard drive, booting from an iSCSI
root. The iSCSI root is a logical volume on a Scientific Linux 6.0 host. I am
able to verify that iSCSI works as expected, and have been able to use iSCSI
from the machine in question to do a base install using an iSCSI root, but the
resulting configuration does not boot.
I am using PXELinux to do the actual netbooting. The system currently gets to
the point where iSCSI is connected but then can't find the root device.
I have set up a label using e2label for the iSCSI volume (I did so by mounting
it), but the label does not seem to make it to the dracut generated initrd.
When I am dropped into the debug shell, no volumes appear present - either by
fdisk -l, blkid, dmesg, or attempting to mount /dev/sda1.
Any help would be much appreciated!
-Asher
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Output on bootup with root=LABEL=rig1
netroot=iscsi:@10.0.0.1::3260::iqn.2011-01.local:rig1
-----------------------------------------------------------------------------------------------------------------------------------
... [ misc boot information up to networking ] ...
eth0: link up.
iscsi:10.0.0.1::3260:01:iqn.2011-01.local:rig1
icscistart: transport class version 2.0-872
iscsistart: Logging into iqn.2011-01.local:rig1 10.0.0.1:3268,1
iscsistart: version 2.0-872
scsi0 : iSCSI initiator over TCP/IP
iscsistart: Connection1:0 to [target: iqn.2011-01.local:rig1, portal:
10.0.0.1,3268] through [iface: default] is operational now
scsi 0:0:0:0: RAID IET Controller 0001 PQ: 0 ANSI: 5
scsi 0:0:0:1: Direct-Access OURHOUSE VIRTUAL-DISK 0001 PQ: 0 ANSI: 5
<28>dracut Warning: No root device "block:/dev/disk/by-label/rig1" found
Dropping to debug shell.
sh: cannot set terminal process group (-1): Inappropriate ioctl for device
sh: no job control in this shell
dracut:/#
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Output on bootup with root=iscsi:@10.0.0.1::3260::iqn.2011-01.local:rig1
-----------------------------------------------------------------------------------------------------------------------------------
... [ misc boot information up to networking ] ...
eth0: link up.
icscistart: transport class version 2.0-872
iscsistart: Logging into iqn.2011-01.local:rig1 10.0.0.1:3268,1
iscsistart: can not connect to iSCSI daemon (111)!
iscsistart: version 2.0-872
scsi0 : iSCSI initiator over TCP/IP
iscsistart: Connection1:0 to [target: iqn.2011-01.local:rig1, portal:
10.0.0.1,3268] through [iface: default] is operational now
scsi 0:0:0:0: RAID IET Controller 0001 PQ: 0 ANSI: 5
scsi 0:0:0:1: Direct-Access OURHOUSE VIRTUAL-DISK 0001 PQ: 0 ANSI: 5
<28>dracut Warning: No root device
"iscsi:@10.0.0.1::3260::iqn.2011-01.local:rig1" found
Dropping to debug shell.
sh: cannot set terminal process group (-1): Inappropriate ioctl for device
sh: no job control in this shell
dracut:/#
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Output of /proc/scsi/scsi after boot drops to debug shell:
-----------------------------------------------------------------------------------------------------------------------------------
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: IET Model: Controler Rev: 0001
Type: RAID ANSI SCSI revision: 05
Host: scsi0 Channel: 00 Id: 00 Lun: 01
Vendor: OURHOUSE Model: VIRTUAL-DISK Rev: 0001
Type: Direct-Access ANSI SCSI revision: 05
-----------------------------------------------------------------------------------------------------------------------------------
/etc/tgt/targets.conf:
-----------------------------------------------------------------------------------------------------------------------------------
default-driver iscsi
<target iqn.2011-01.local:rig1>
vendor_id OURHOUSE
<backing-store /dev/ourhouse15s/rig1>
lun 1
scsi_sn snrig1
</backing-store>
allow-in-use yes
#initiator-address 10.0.0.1
</target>
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I used the kernel from the server running DHCPd and created an initrd using
dracut:
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dracut -m "iscsi network base" --install 'ssh sshd df fdisk' --add-drivers
'iscsi rootfs-block' initramfs-net.img
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/tftpboot/pxelinux.cfg:
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default menu.c32
prompt 0
timeout 100
ONTIMEOUT local
MENU TITLE PXE Menu
LABEL Scientific Linux 6.0 - iSCSI Parameter
MENU LABEL Scientific Linux 6.0
KERNEL images/scientific_linux/x86_64/6.0/vmlinuz
APPEND noapic initrd=images/scientific_linux/x86_64/6.0/initrd.img
root=LABEL=rig1 netroot=iscsi:10.0.0.1::3260:01:iqn.2011-01.local:rig1
-----------------------------------------------------------------------------------------------------------------------------------
/etc/dhcpd.conf:
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authoritative;
default-lease-time 86400;
option domain-name "local";
option routers 10.0.0.1;
option subnet-mask 255.255.255.0;
use-host-decl-names on;
option domain-name-servers 10.0.0.1;
option time-offset -5;
option time-servers clock.redhat.com;
deny client-updates;
deny unknown-clients;
ddns-update-style ad-hoc;
option option-128 code 128 = string;
option option-129 code 129 = text;
shared-network OurHouse {
subnet 10.0.0.0 netmask 255.255.255.0 {
allow unknown-clients;
range 10.0.0.101 10.0.0.240;
}
}
group {
allow booting;
allow bootp;
next-server 10.0.0.1;
filename "/pxelinux.0";
host rig1 {
hardware ethernet f4:6d:04:0f:46:62;
fixed-address 10.0.0.90;
}
}
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