openStack镜像制作

参考链接:

https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki/OpenStack/page/Creating+qcow2+CentOS+Image+for+OpenStack

http://docs.openstack.org/image-guide/content/centos-image.html

http://www.it165.net/os/html/201309/6121.html

https://answers.launchpad.net/nova/+question/226471

http://ssms.cs2c.com.cn/otrs/pc.pl?Action=PublicFAQZoom;ItemID=10224;ZoomBackLink=QWN0aW9uPVB1YmxpY0ZBUUV4cGxvcmVyO0NhdGVnb3J5SUQ9MTQ7U29ydEJ5PVRpdGxlO09yZGVy%0APVVwO1N0YXJ0SGl0PTI2MDE%3D%0A;

使用ISO镜像制作适用于OpenStack的云镜像

资源：

- ISO镜像文件，此处选择RedHat Enterprise Linux 5.5 x86_64 ISO镜像文件；

- 支持qemu-kvm的Linux实体机；

注意：

经验证，RHEL5.5不支持在线对根目录扩容，需要对根目录进行在线扩容的请谨慎选择。

（如果有解决方法，欢迎留言。）

Linux实体机：

# qemu-img create -f qcow2 rhel-5.5-x86_64.qcow2 10G
# kvm -m 2048 -cdrom rhel-server-5.5-x86_64-dvd.iso -drive file=rhel-5.5-x86_64.qcow2,if=virtio,index=0 -boot d -net nic -net user
# kvm -m 2048 -drive file=rhel-5.5-x86_64.qcow2,if=virtio,index=0 -boot d -net nic -net user

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此处，操作系统的安装与实体机安装一样，安装完成后会有一个1G左右的rhel-5.5-x86_64.qcow2文件。使用Virtual Machine Manager虚拟机管理工具从QCOW2文件启动虚拟机。

虚拟机：

# yum update -y
# chkconfig sshd on
# vim /etc/ssh/sshd_config
--- #PermitEmptyPasswords no
+++ PasswordAuthentication yes
--- #PermitRootLogin yes
+++ PermitRootLogin yes
# yum install acpid
# chkconfig acpid on
# yum install cloud-init

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/etc/cloud/cloud-init.conf可能需要进行适当修改。

为保证实例能够访问neutron metadata服务，需要禁用zeroconf

# echo "NOZEROCONF=yes" >> /etc/sysconfig/network

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开启磁盘热插拔，支持在线挂载云硬盘

#echo -e "#! /bin/sh\n\n/sbin/modinfo -F filename acpiphp > /dev/null 2>&1\n\nif [ $? -eq 0 ]; then\n     /sbin/modprobe acpiphp\nfi" >> /etc/sysconfig/modules/acpiphp.modules

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开启nova console log支持

# vim /boot/grub/menu.lst

+++ serial --unit=0 --speed=115200
+++ terminal --timeout=10 console serial
--- kernel /vmlinuz-2.6.18-194.el5 ro root=/dev/VolGroup00/LogVol00
+++ kernel /vmlinuz-2.6.18-194.el5 ro root=/dev/VolGroup00/LogVol00 console=tty0 console=ttyS0,115200n8

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制作完成，关闭虚拟机

#/sbin/shutdown -h now

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Linux实体机：

清理虚拟机登陆及日志信息等

# virt-sysprep -d rhel5.5

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压缩镜像文件

# qemu-img convert -c -O qcow2 /root/rhel-5.5-x86_64.qcow2 /root/rhel-5.5-x86_64-compressed.qcow2

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上传镜像

# glance image-create --name "RedHat Enterprise Linux 5.5 x86_64" --disk-format qcow2 --container-format bare --is-public True --file  /root/rhel-5.5-x86_64-compressed.qcow2 --progress

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Q&A

a. Cannot see the attached volume in the instance:

For RHEL 5.x, acpiphp is not loaded.

# modprobe acpiphp
# reboot

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***Bootable kernel module hotplugin and acpiphp should be added.