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利用OZ工具创建openstack镜像

时间:2015-05-27 16:06:43      阅读:397      评论:0      收藏:0      [点我收藏+]

标签:oz openstack image

导入epel

# rpm -ivh http://mirrors.sohu.com/fedora-epel/6/x86_64/epel-release-6-8.noarch.rpm

安装OZ工具包及其依赖

# yum install -y oz libguestfs-tools

查看OZ的安装信息

# rpm -qa | grep oz

# rpm -ql oz-0.12.0-2.el6.noarch

 

/usr/lib/python2.6/site-packages/oz/auto   各操作系统自动化安装模板所在目录

/usr/share/doc/oz-0.12.0/examples            tdl配置模板所在目录

配置OZ使创建的镜像类型为qcows for openstack

# cat /etc/oz/oz.cfg

[paths]

output_dir = /var/lib/libvirt/images

data_dir = /var/lib/oz

screenshot_dir = /var/lib/oz/screenshots

# sshprivkey = /etc/oz/id_rsa-icicle-gen

 

[libvirt]

uri = qemu:///system

#image_type = raw                    #raw输出的结果文件太大,不支持压缩

image_type = qcow2                 #修改镜像类型为qcow2,支持压缩,1-2G文件能压缩到几百兆

# type = kvm

# bridge_name = virbr0

# cpus = 1

# memory = 1024

 

[cache]

original_media = yes

modified_media = no

jeos = no

 

[icicle]

safe_generation = no

创建tdl文件

更多参考例子:https://github.com/rcbops/oz-image-build/tree/master/templates

tdl文件安装支持两种格式:一种是iso,另一种是url,它们之间的差异是:采用iso类型时oz需要能够获取源镜像文件;URL类型则是从远程服务器(如cobbler服务器上)获取iso解压后的文件。例如:

#iso类型配置

<install type=‘iso‘>

<iso>file:////opt/rhel-server-6.5-x86_64-dvd.iso</iso>

</install>

或者:

<install type=‘iso‘>

<iso>ftp://kickstart.rackspace.com/isos/redhat/6.5/rhel-server-6.5-x86_64-dvd.iso</iso>

</install>

或者:

<installtype=‘iso‘>

<iso>http://mirror.rackspace.com/CentOS/6/isos/x86_64/CentOS-6.5-x86_64-bin-DVD1.iso</iso>

</install>

#url类型配置

<install type=‘url‘>

<url>http://mirror.rackspace.com/centos/6/os/x86_64/</url>

</install>

 

我创建的tdl文件(ISO类型注意下面的文件内容要满足xml文件格式,否则会报错):

# cat rhel6.5.tdl

<template>

   <name>rhel6.5_x86_64</name>

   <description>RedHat 6.5 x86_64 template</description>

   <os>

       <name>RHEL-6</name>

       <version>5</version>

       <arch>x86_64</arch>

       <rootpw>linuxblind</rootpw>

       <install type=‘iso‘>

           <iso>file:////var/oz/ios/rhel-server-6.5-x86_64-dvd.iso</iso>

       </install>

   </os>

   <disk>

       <size>20</size>

   </disk>

   <commands>

       <command name=‘console‘>

           sed -i ‘s/ rhgb//g‘ /boot/grub/grub.conf

           sed -i ‘s/ quiet//g‘ /boot/grub/grub.conf

       </command>

       <command name=‘update‘>

           sed -i ‘/^HWADDR/d‘ /etc/sysconfig/network-scripts/ifcfg-eth0

           sed -i ‘/^UUID/d‘ /etc/sysconfig/network-scripts/ifcfg-eth0

           echo -n > /etc/udev/rules.d/70-persistent-net.rules

           echo -n > /lib/udev/rules.d/75-persistent-net-generator.rules

           sed -i ‘/^SELINUX=/s/enforcing/disabled/‘ /etc/selinux/config

       </command>

   </commands>

</template>

创建kickstart文件

更多参考例子:https://github.com/clalancette/oz/blob/master/oz/auto/

我创建的ks文件(这里采用RHEL6.auto作为模板):

# cat rhel6.5.ks

install

text

key --skip

keyboard us

lang en_US.UTF-8

skipx

network --device eth0 --bootproto dhcp

#network --device eth1 --bootproto dhcp

rootpw linuxblind

firewall --disabled

authconfig --enableshadow --enablemd5

selinux --disabled

timezone --utc Asia/Shanghai

bootloader --location=mbr--append="console=tty0 console=ttyS0,115200"

zerombr yes

clearpart --all

part /boot --fstype ext4 --size=200

part /    --fstype ext4 --size=10000

part swap --fstype swap --size=2048

part /var --fstype ext4 --grow --size=200

reboot

%packages

@core

@server-policy

%post

说明:用kickstart文件制作的镜像优点:支持自定义分区、定制安装包和自定义脚本等

开始制作镜像

# oz-install -p -u -d3 -a rhel6.5.ks rhel6.5.tdl

镜像创建完成后,会保存在/var/lib/libvirt/images/下,使用下面的语句压缩镜像,方便上传

# qemu-img convert -c/var/lib/libvirt/images/rhel6.5_x86_64.qcow2 -O qcow2 /opt/rhel6.5_x86_64.qcow2

 

如果生成的是raw格式,可以使用下面的语句转换成qcow2格式

# qemu-img convert/var/lib/libvirt/images/rhel6.5_x86_64.dsk -O qcow2 /opt/rhel6.5_x86_64.qcow2

 

压缩比:

# du -sh /opt/rhel6.5_x86_64.qcow2

399M    rhel6.5_x86_64.qcow2

# du -sh /var/lib/libvirt/images/rhel6.5_x86_64.qcow2

1.6G   /var/lib/libvirt/images/rhel6.5_x86_64.qcow2

问题

问题1:使用# oz-install -p -u -d3 -a rhel6.5.ks rhel6.5.tdl 安装时提示下面的错误

raise oz.OzException.OzException("Nodisk activity in %d seconds, failing. %s" % (inactivity_timeout, screenshot_text))

oz.OzException.OzException: No diskactivity in 300 seconds, failing.  Checkscreenshot at /var/lib/oz/screenshots/rhel6.5_x86_64-1432621714.18.ppm for moredetail

解决办法:检查ks文件是否有误,通常都是由于ks文件引起的

 

问题2

oz.OzException.OzException: UnsupportedRHEl-6 update 5

解决办法:

修改rhel6.5.tdl文件,将<name>RHEl-6</name> 修改为<name>RHEL-6</name>

查看支持哪些参阅:https://github.com/clalancette/oz/blob/master/oz/GuestFactory.py


本文出自 “linuxblind开放空间” 博客,请务必保留此出处http://linuxblind.blog.51cto.com/7616603/1655550

利用OZ工具创建openstack镜像

标签:oz openstack image

原文地址:http://linuxblind.blog.51cto.com/7616603/1655550

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