[Ovirt-devel] [PATCH node-image] add livecd-iso-to-iscsi script to support iscsi root booting setup
Joey Boggs
jboggs at redhat.com
Tue Sep 15 02:35:16 UTC 2009
This enables the ability to take the ovirt-node-image iso and deploy it to an iscsi disk. It also provides a sample pxe configuration for booting based on the iscsi root device. Includes support for user/password as well as reverse chap user/password.
---
Makefile.am | 1 +
livecd-iso-to-iscsi | 201 ++++++++++++++++++++++++++++++++++++++++++++++
ovirt-node-image.spec.in | 2 +
3 files changed, 204 insertions(+), 0 deletions(-)
create mode 100755 livecd-iso-to-iscsi
diff --git a/Makefile.am b/Makefile.am
index a44ae49..306f49f 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -45,6 +45,7 @@ EXTRA_DIST = \
$(PACKAGE).ks \
create-ovirt-iso-nodes \
edit-livecd \
+ livecd-iso-to-iscsi \
livecd-setauth \
livecd-rpms \
README
diff --git a/livecd-iso-to-iscsi b/livecd-iso-to-iscsi
new file mode 100755
index 0000000..fd3934d
--- /dev/null
+++ b/livecd-iso-to-iscsi
@@ -0,0 +1,201 @@
+#!/usr/bin/python
+# Convert a live CD iso into iscsi root bootable format
+# iSCSI lun must be accessible via this script
+# Copyright 2009 Red Hat, Inc.
+# Written by Joey boggs <jboggs at redhat.com>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU Library General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+from optparse import OptionParser
+from tempfile import mkdtemp
+import dbus
+import dbus.glib
+import sys
+import os
+import subprocess
+import shutil
+
+parser = OptionParser()
+parser.add_option("--iso", dest="iso", help="LiveCD iso filename")
+parser.add_option("--target", dest="target", help="iSCSI target ip address")
+parser.add_option("--targetname", dest="targetname", help="iSCSI target lun")
+parser.add_option("--targetport", dest="targetport", default="3260", help="iSCSI port number, defaults to 3260")
+parser.add_option("--user", dest="user", help="Target username(optional)")
+parser.add_option("--password", dest="password", help="Target password")
+parser.add_option("--reverse_user", dest="reverse_user", help="Reverse CHAP username(optional)")
+parser.add_option("--reverse_password", dest="reverse_password", help="Reverse CHAP password(optional)")
+parser.add_option("--disk", dest="disk", help="iSCSI disk device name")
+parser.add_option("--disk-label", dest="disk_label", default="ovirt-node-root", help="file system label")
+
+(options, args) = parser.parse_args()
+
+def fail(msg):
+ print(msg)
+ sys.exit(1)
+
+if os.geteuid () != 0:
+ fail("You must run as root")
+
+if options.iso is None:
+ fail("ERROR: iso file must be defined")
+else:
+ options.iso = os.path.abspath(options.iso)
+
+if options.target is None:
+ fail("ERROR: iscsi target must be defined")
+
+if options.targetname is None:
+ fail("ERROR: iscsi targetname must be defined")
+
+if len(options.disk_label.strip()) > 15:
+ fail("ERROR: disk label must be 14 characters or less")
+
+try:
+ file = os.mkdir("tftpboot")
+except OSError, e:
+ tftp_remove = raw_input("tftpboot directory exists, overwrite? (y/N)? ")
+ if tftp_remove.lower() == "y":
+ shutil.rmtree("tftpboot")
+ os.mkdir("tftpboot")
+ else:
+ print "Aborting"
+ sys.exit(1)
+
+if options.disk is None:
+ print "Below are the detected disks, if the iscsi disk is not shown, please ensure you are logged into the correct target\n"
+ bus = dbus.SystemBus ()
+ hal_obj = bus.get_object ('org.freedesktop.Hal', '/org/freedesktop/Hal/Manager')
+ hal = dbus.Interface (hal_obj, 'org.freedesktop.Hal.Manager')
+ udis = hal.FindDeviceByCapability ('storage')
+ dev_dict = {}
+ dev_count = 1
+ for udi in udis:
+ dev_obj = bus.get_object ('org.freedesktop.Hal', udi)
+ dev = dbus.Interface (dev_obj, 'org.freedesktop.Hal.Device')
+ dev_bus=dev.GetProperty ('storage.bus')
+ dev_name=dev.GetProperty ('block.device')
+ dev_size=dev.GetProperty ('storage.size')
+ dev_size=(dev_size/1024/1024)
+ basename=os.path.basename(udi)
+ if dev_bus == "scsi":
+ print "%s. %s %sM %s \n" % (dev_count,dev_name,dev_size,basename)
+ dev_dict[str(dev_count)] = dev_name
+ dev_count = dev_count + 1
+ print "Enter Q to Quit"
+ dev_choice = raw_input("Which device? ")
+ while not dev_dict.has_key(dev_choice):
+ if dev_choice.lower() == "q":
+ print "Aborting"
+ sys.exit(1)
+ else:
+ print "%s is an invalid choice" % dev_choice
+ dev_choice = raw_input("Which device? ")
+ options.disk = dev_dict[dev_choice]
+
+cont = raw_input("Creating file system on %s, do you wish to continue (y/N) " % options.disk)
+if cont.lower() != "y":
+ print "Aborting"
+ sys.exit(1)
+
+isomount = mkdtemp()
+isomount_ret = subprocess.call(["mount", "-o", "loop", options.iso, isomount])
+if isomount_ret != 0:
+ fail("Error mounting %s" % options.iso)
+
+kernel="%s/isolinux/vmlinuz0" % isomount
+initrd="%s/isolinux/initrd0.img" % isomount
+squashfs="%s/LiveOS/squashfs.img" % isomount
+ext3fs="tftpboot/squashfs-root/LiveOS/ext3fs.img"
+shutil.copy(kernel,"tftpboot")
+shutil.copy(initrd,"tftpboot")
+
+unsquash = subprocess.call(["unsquashfs", squashfs])
+
+# workaround until bug is fixed with squashfs -d option
+shutil.move("squashfs-root","tftpboot/squashfs-root")
+
+print "Placing embedded file system on %s" % options.disk
+dd_cmd="dd if=%s of=%s" % (ext3fs,options.disk)
+copy_iscsi_ret = subprocess.call(dd_cmd, shell=True)
+if copy_iscsi_ret != 0:
+ fail("Error copying to %s" % options.disk)
+
+umount_ret = subprocess.call(["umount", isomount])
+if umount_ret != 0:
+ fail("Error unmounting %s, continuing" % isomount)
+else:
+ os.rmdir(isomount)
+shutil.rmtree("tftpboot/squashfs-root")
+
+pxe_template = """
+
+# pxelinux configuration.
+DEFAULT pxeboot
+TIMEOUT 20
+PROMPT 0
+LABEL ovirt-node-iscsi
+ KERNEL /vmlinuz0
+ APPEND initrd=/initrd0.img ro root=LABEL=%(disk_label)s netroot=iscsi:%(user)s%(password)s@%(target)s::%(target_port)s::%(target_name)s ip=eth0:dhcp
+ ipappend 2
+ONERROR LOCALBOOT 0
+"""
+
+# insert empty values for unneeded variables in the pxe template
+if not options.user is None:
+ options.user = options.user + ":"
+else:
+ options.user = ""
+
+if not options.password is None:
+ options.password = options.password + ":"
+else:
+ options.password = ""
+
+if not options.reverse_user is None:
+ options.reverse_user = options.reverse_user + ":"
+else:
+ options.reverse_user = ""
+
+if not options.reverse_password is None:
+ options.reverse_password = options.reverse_password + ":"
+else:
+ options.reverse_password = ""
+
+os.mkdir("tftpboot/pxelinux.cfg")
+pxe_cfg = pxe_template % {
+ "disk_label": options.disk_label,
+ "target": options.target,
+ "target_port": options.targetport,
+ "target_name": options.targetname,
+ "user": options.user,
+ "password": options.password,
+ "reverse_user": options.reverse_user,
+ "reverse_password": options.reverse_password
+ }
+
+pxe_conf = open("tftpboot/pxelinux.cfg/default", 'w')
+pxe_conf.write(pxe_cfg)
+pxe_conf.close()
+
+if os.path.exists("/usr/share/syslinux/pxelinux.0"):
+ shutil.copy("/usr/share/syslinux/pxelinux.0","tftpboot")
+elif os.path.exists("/usr/lib/syslinux/pxelinux.0"):
+ shutil.copy("/usr/lib/syslinux/pxelinux.0","tftpboot")
+else:
+ print "Warning: You need to add pxelinux.0 to tftpboot/ subdirectory"
+
+print "Your iscsiroot has been setup on %s" % options.disk
+print ""
+print "Copy the tftpboot/ subdirectory to your tftpserver root directory"
+print "Set up your DHCP, TFTP and PXE server to serve /tftpboot/.../pxeboot.0"
diff --git a/ovirt-node-image.spec.in b/ovirt-node-image.spec.in
index e64f4de..1f8c31b 100644
--- a/ovirt-node-image.spec.in
+++ b/ovirt-node-image.spec.in
@@ -65,6 +65,7 @@ mkdir %{buildroot}
%{__install} -d -m0755 %{buildroot}%{_sbindir}
%{__install} -p -m0755 create-ovirt-iso-nodes %{buildroot}%{_sbindir}
%{__install} -p -m0755 edit-livecd %{buildroot}%{_sbindir}
+%{__install} -p -m0755 livecd-iso-to-iscsi %{buildroot}%{_sbindir}
%{__install} -p -m0755 livecd-setauth %{buildroot}%{_sbindir}
%{__install} -p -m0755 livecd-rpms %{buildroot}%{_sbindir}
%{__tar} -xf %{image_manifests} -C %{buildroot}%{app_root}
@@ -94,6 +95,7 @@ cobbler sync > /dev/null 2>&1 || :
%defattr(0755,root,root,0755)
%{_sbindir}/create-ovirt-iso-nodes
%{_sbindir}/edit-livecd
+%{_sbindir}/livecd-iso-to-iscsi
%{_sbindir}/livecd-setauth
%{_sbindir}/livecd-rpms
--
1.6.2.5
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