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113 lines
7.8 KiB
XML
113 lines
7.8 KiB
XML
<?xml version='1.0' encoding='utf-8' ?>
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<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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<!ENTITY % BOOK_ENTITIES SYSTEM "cloudstack.ent">
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%BOOK_ENTITIES;
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]>
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<!-- Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The ASF licenses this file
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to you under the Apache License, Version 2.0 (the
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"License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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-->
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<section id="import-ami">
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<title>Importing Amazon Machine Images</title>
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<para>The following procedures describe how to import an Amazon Machine Image (AMI) into &PRODUCT; when using the XenServer hypervisor.</para>
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<para>Assume you have an AMI file and this file is called CentOS_6.2_x64. Assume further that you are working on a CentOS host. If the AMI is a Fedora image, you need to be working on a Fedora host initially.</para>
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<para>You need to have a XenServer host with a file-based storage repository (either a local ext3 SR or an NFS SR) to convert to a VHD once the image file has been customized on the Centos/Fedora host.</para>
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<note><para>When copying and pasting a command, be sure the command has pasted as a single line before executing. Some document viewers may introduce unwanted line breaks in copied text.</para></note>
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<orderedlist>
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<listitem><para>Set up loopback on image file:</para><programlisting># mkdir -p /mnt/loop/centos62
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# mount -o loop CentOS_6.2_x64 /mnt/loop/centos54
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</programlisting></listitem>
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<listitem><para>Install the kernel-xen package into the image. This downloads the PV kernel and ramdisk to the image.</para><programlisting># yum -c /mnt/loop/centos54/etc/yum.conf --installroot=/mnt/loop/centos62/ -y install kernel-xen</programlisting></listitem>
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<listitem><para>Create a grub entry in /boot/grub/grub.conf.</para><programlisting># mkdir -p /mnt/loop/centos62/boot/grub
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# touch /mnt/loop/centos62/boot/grub/grub.conf
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# echo "" > /mnt/loop/centos62/boot/grub/grub.conf
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</programlisting></listitem>
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<listitem><para>Determine the name of the PV kernel that has been installed into the image.</para>
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<programlisting># cd /mnt/loop/centos62
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# ls lib/modules/
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2.6.16.33-xenU 2.6.16-xenU 2.6.18-164.15.1.el5xen 2.6.18-164.6.1.el5.centos.plus 2.6.18-xenU-ec2-v1.0 2.6.21.7-2.fc8xen 2.6.31-302-ec2
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# ls boot/initrd*
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boot/initrd-2.6.18-164.6.1.el5.centos.plus.img boot/initrd-2.6.18-164.15.1.el5xen.img
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# ls boot/vmlinuz*
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boot/vmlinuz-2.6.18-164.15.1.el5xen boot/vmlinuz-2.6.18-164.6.1.el5.centos.plus boot/vmlinuz-2.6.18-xenU-ec2-v1.0 boot/vmlinuz-2.6.21-2952.fc8xen
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</programlisting>
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<para>Xen kernels/ramdisk always end with "xen". For the kernel version you choose, there has to be an entry for that version under lib/modules, there has to be an initrd and vmlinuz corresponding to that. Above, the only kernel that satisfies this condition is 2.6.18-164.15.1.el5xen.</para></listitem>
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<listitem><para>Based on your findings, create an entry in the grub.conf file. Below is an example entry.</para><programlisting>default=0
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timeout=5
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hiddenmenu
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title CentOS (2.6.18-164.15.1.el5xen)
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root (hd0,0)
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kernel /boot/vmlinuz-2.6.18-164.15.1.el5xen ro root=/dev/xvda
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initrd /boot/initrd-2.6.18-164.15.1.el5xen.img
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</programlisting></listitem>
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<listitem><para>Edit etc/fstab, changing “sda1” to “xvda” and changing “sdb” to “xvdb”.</para>
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<programlisting># cat etc/fstab
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/dev/xvda / ext3 defaults 1 1
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/dev/xvdb /mnt ext3 defaults 0 0
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none /dev/pts devpts gid=5,mode=620 0 0
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none /proc proc defaults 0 0
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none /sys sysfs defaults 0 0
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</programlisting></listitem>
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<listitem><para>Enable login via the console. The default console device in a XenServer system is xvc0. Ensure that etc/inittab and etc/securetty have the following lines respectively:</para>
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<programlisting># grep xvc0 etc/inittab
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co:2345:respawn:/sbin/agetty xvc0 9600 vt100-nav
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# grep xvc0 etc/securetty
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xvc0
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</programlisting></listitem>
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<listitem><para>Ensure the ramdisk supports PV disk and PV network. Customize this for the kernel version you have determined above.</para>
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<programlisting># chroot /mnt/loop/centos54
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# cd /boot/
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# mv initrd-2.6.18-164.15.1.el5xen.img initrd-2.6.18-164.15.1.el5xen.img.bak
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# mkinitrd -f /boot/initrd-2.6.18-164.15.1.el5xen.img --with=xennet --preload=xenblk --omit-scsi-modules 2.6.18-164.15.1.el5xen
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</programlisting></listitem>
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<listitem><para>Change the password.</para>
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<programlisting># passwd
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Changing password for user root.
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New UNIX password:
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Retype new UNIX password:
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passwd: all authentication tokens updated successfully.
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</programlisting></listitem>
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<listitem><para>Exit out of chroot.</para><programlisting># exit</programlisting></listitem>
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<listitem><para>Check etc/ssh/sshd_config for lines allowing ssh login using a password.</para>
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<programlisting># egrep "PermitRootLogin|PasswordAuthentication" /mnt/loop/centos54/etc/ssh/sshd_config
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PermitRootLogin yes
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PasswordAuthentication yes
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</programlisting></listitem>
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<listitem><para>If you need the template to be enabled to reset passwords from the &PRODUCT; UI or API,
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install the password change script into the image at this point. See
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<xref linkend="add-password-management-to-templates"/>.</para></listitem>
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<listitem><para>Unmount and delete loopback mount.</para><programlisting># umount /mnt/loop/centos54
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# losetup -d /dev/loop0
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</programlisting></listitem>
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<listitem><para>Copy the image file to your XenServer host's file-based storage repository. In the example below, the Xenserver is "xenhost". This XenServer has an NFS repository whose uuid is a9c5b8c8-536b-a193-a6dc-51af3e5ff799.</para>
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<programlisting># scp CentOS_6.2_x64 xenhost:/var/run/sr-mount/a9c5b8c8-536b-a193-a6dc-51af3e5ff799/</programlisting></listitem>
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<listitem><para>Log in to the Xenserver and create a VDI the same size as the image.</para>
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<programlisting>[root@xenhost ~]# cd /var/run/sr-mount/a9c5b8c8-536b-a193-a6dc-51af3e5ff799
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[root@xenhost a9c5b8c8-536b-a193-a6dc-51af3e5ff799]# ls -lh CentOS_6.2_x64
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-rw-r--r-- 1 root root 10G Mar 16 16:49 CentOS_6.2_x64
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[root@xenhost a9c5b8c8-536b-a193-a6dc-51af3e5ff799]# xe vdi-create virtual-size=10GiB sr-uuid=a9c5b8c8-536b-a193-a6dc-51af3e5ff799 type=user name-label="Centos 6.2 x86_64"
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cad7317c-258b-4ef7-b207-cdf0283a7923
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</programlisting></listitem>
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<listitem><para>Import the image file into the VDI. This may take 10–20 minutes.</para><programlisting>[root@xenhost a9c5b8c8-536b-a193-a6dc-51af3e5ff799]# xe vdi-import filename=CentOS_6.2_x64 uuid=cad7317c-258b-4ef7-b207-cdf0283a7923</programlisting></listitem>
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<listitem><para>Locate a the VHD file. This is the file with the VDI’s UUID as its name. Compress it and upload it to your web server.</para>
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<programlisting>[root@xenhost a9c5b8c8-536b-a193-a6dc-51af3e5ff799]# bzip2 -c cad7317c-258b-4ef7-b207-cdf0283a7923.vhd > CentOS_6.2_x64.vhd.bz2
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[root@xenhost a9c5b8c8-536b-a193-a6dc-51af3e5ff799]# scp CentOS_6.2_x64.vhd.bz2 webserver:/var/www/html/templates/
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</programlisting></listitem>
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</orderedlist>
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</section>
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