完整部署CentOS7.2+OpenStack+kvm 云平台环境（4）--用OZ工具制作openstack镜像

2023-07-18 19:03:34

在部署openstack云平台环境的时候，需要上传镜像到glance。

首先下载iso镜像，这里下载了centos6.5镜像，放到/usr/local/src目录下
然后用OZ工具制作openstack的镜像

*******************************安装libvirt虚拟机软件****************************************
[root@openstack-server src]# yum install qemu-kvm libvirt libvirt-python libguestfs-tools virt-install
[root@openstack-server src]# systemctl enable libvirtd && systemctl start libvirtd
************************************************************************************

[root@openstack-server src]#yum install -y oz libguestfs-tools

[root@openstack-server src]# pwd
/usr/local/src
[root@openstack-server src]# ll CentOS-6.5-x86_64-bin-DVD1.iso #下载的iso镜像
-rw-r--r--. 1 root root 4467982336 Nov 29 2013 CentOS-6.5-x86_64-bin-DVD1.iso
[root@openstack-server src]# cat CentOS6u5-x86_64.tdl #创建tdl 文件
<template>
<name>CentOS6u5-x86_64</name>
<description>CentOS6u5-x86_64 template</description>
<os>
<name>CentOS-6</name>
<version>5</version>
<arch>x86_64</arch>
<rootpw>PASSWORD</rootpw> #这个是虚拟机创建好后，root的登陆密码，密码是在这个镜像里定义的！
<install type='iso'>
<iso>file:///usr/local/src/CentOS-6.5-x86_64-bin-DVD1.iso</iso>
</install>
</os>
<commands> #centos7系统里没有/boot/grub/grub.conf文件，这块可以不用写，但写了也无妨。这里我是centos7，也写了
<command name='console'>
sed -i 's/ rhgb//g' /boot/grub/grub.conf
sed -i 's/ quiet//g' /boot/grub/grub.conf
sed -i 's/ console=tty0 / serial=tty0 console=ttyS0,115200n8 /g' /boot/grub/grub.conf
</command>
</commands>
</template>

在用OZ工具制作openstack镜像，有报错：
[root@openstack-server src]# oz-install -u -d3 CentOS6u5-x86_64.tdl #报错如下：
..................
raise oz.OzException.OzException("Could not find a libvirt bridge. Please run 'virsh net-start default' to start the default libvirt network, or see http://github.com/clalancette/oz/wiki/Oz-Network-Configuration for more information")
oz.OzException.OzException: Could not find a libvirt bridge. Please run 'virsh net-start default' to start the default libvirt network, or see http://github.com/clalancette/oz/wiki/Oz-Network-Configuration for more information

[root@openstack-server src]# virsh net-start default
error: failed to get network 'default'
error: Network not found: no network with matching name 'default'

查阅资料，说是因为 default 网络不存在
回想了一下，我开始在捣鼓openstack 的时候，可能用命令删除了default，也或许没有启动default网络
因为在不同的环境下，default.xml 的存放路径不同，这里笔者以自己的 centos7 为例

[root@openstack-server src]# find / -name "default.xml"
/etc/libvirt/qemu/networks/autostart/default.xml
/etc/libvirt/qemu/networks/default.xml
/usr/share/backgrounds/default.xml
/usr/share/libvirt/networks/default.xml
[root@openstack-server src]# virsh net-define /usr/share/libvirt/networks/default.xml
Network default defined from /usr/share/libvirt/networks/default.xml

[root@openstack-server src]# virsh net-start default
Network default started

[root@openstack-server src]# virsh net-list
Name State Autostart Persistent
----------------------------------------------------------
default active no yes

[root@openstack-server src]#

然后接着再进行openstack镜像的制作：
[root@openstack-server src]# oz-install -u -d3 CentOS6u5-x86_64.tdl
libvirt bridge name is virbr0
Libvirt type is kvm
Name: CentOS6u5-x86_64, UUID: 0a9b1d18-f517-40ae-9de9-1fd6101878e2
MAC: 52:54:00:fb:0b:c9, distro: CentOS-6
update: 5, arch: x86_64, diskimage: /var/lib/libvirt/images/CentOS6u5-x86_64.dsk
nicmodel: virtio, clockoffset: utc
mousetype: ps2, disk_bus: virtio, disk_dev: vda
icicletmp: /var/lib/oz/icicletmp/CentOS6u5-x86_64, listen_port: 36050
Original ISO path: /var/lib/oz/isos/CentOS-65x86_64-iso.iso
Modified ISO cache: /var/lib/oz/isos/CentOS-65x86_64-iso-oz.iso
Output ISO path: /var/lib/libvirt/images/CentOS6u5-x86_64-iso-oz.iso
ISO content path: /var/lib/oz/isocontent/CentOS6u5-x86_64-iso
Checking for guest conflicts with CentOS6u5-x86_64
Generating install media
Attempting to get the lock for /var/lib/oz/isos/CentOS-65x86_64-iso.iso
Got the lock for /var/lib/oz/isos/CentOS-65x86_64-iso.iso
Fetching the original media
Fetching the original install media from file:///usr/local/src/CentOS-6.5-x86_64-bin-DVD1.iso
15kB of 4363264kB
10255kB of 4363264kB
20494kB of 4363264kB
30734kB of 4363264kB
40973kB of 4363264kB
51212kB of 4363264kB
....................
....................
....................
Cleaning up guestfs handle for CentOS6u5-x86_64
Syncing
Unmounting all
Libvirt XML was written to CentOS6u5-x86_64Aug_30_2016-13:47:18

注意：
镜像制作完默认会存放到/var/lib/libvirt/images/ 目录下，可以在/etc/oz/oz.cfg 配置文件中进行修改路径。

[root@openstack-server src]# cd /var/lib/libvirt/images/
[root@openstack-server images]# pwd
/var/lib/libvirt/images
[root@openstack-server images]# ll
total 1087336
-rw-rw-rw-. 1 root root 10737418240 Aug 30 13:47 CentOS6u5-x86_64.dsk
[root@openstack-server images]# virt-sysprep --add CentOS6u5-x86_64.dsk
[ 0.0] Examining the guest ...
[ 5.0] Performing "abrt-data" ...
...........
[ 5.0] Setting a random seed
[ 5.0] Performing "lvm-uuids" ...

查看文件信息
[root@openstack-server images]# qemu-img info CentOS6u5-x86_64.dsk
image: CentOS6u5-x86_64.dsk
file format: raw
virtual size: 10G (10737418240 bytes)
disk size: 1.0G

上传镜像到 Glance
[root@openstack-server images]# glance image-create --name "CentOS-6.5" --file /var/lib/libvirt/images/CentOS6u5-x86_64.dsk --disk-format qcow2 --container-format bare --visibility public --progress
[=============================>] 100%

查看镜像
[root@openstack-server images]# glance image-list
+--------------------------------------+------------+
| ID | Name |
+--------------------------------------+------------+
| 508db9d4-6c9f-459d-8782-065ee8b6f2c2 | CentOS-6.5 |
+--------------------------------------+------------+

登陆openstack界面，发现可以查看到上面已经上传到glance里面的镜像。上面使用OZ工具制作的openstack所需要的Centos6/Centos7镜像的默认大小是10G（如下图）。

----------------------------------------------------------------------------------------------------------
注意：

如果不想用OZ工具制作，可以直接下载centos的qcow2格式镜像

下载地址：http://cloud.centos.org/centos 【有centos6/7的镜像】

比如：下载centos7的qcow2格式镜像
#wget http://cloud.centos.org/centos/7/images/CentOS-7-x86_64-GenericCloud.qcow2

上传到 galnce
#glance image-create --name "CentOS-7-x86_64" --disk-format qcow2 --container-format bare --file
CentOS-7-x86_64-GenericCloud.qcow2 --visibility public --progress

-------------------------------------------------------------------------------------------------------------

当然，也可以使用OZ工具制作openstack需要的qcow2的Centos7镜像
[root@openstack-server src]# pwd
/usr/local/src
[root@openstack-server src]# ls CentOS-7-x86_64-DVD-1511.iso
CentOS-7-x86_64-DVD-1511.iso
[root@openstack-server src]# ls CentOS-7-x86_64.tdl
CentOS-7-x86_64.tdl
[root@openstack-server src]# cat CentOS-7-x86_64.tdl
<template>
<name>CentOS-7-x86_64</name>
<description>CentOS-7-x86_64 template</description>
<os>
<name>CentOS-7</name>
<version>2</version>
<arch>x86_64</arch>
<rootpw>PASSWORD</rootpw>
<install type='iso'>
<iso>file:///usr/local/src/CentOS-7-x86_64-DVD-1511.iso</iso>
</install>
</os>
<commands>
<command name='console'>
sed -i 's/ rhgb//g' /boot/grub/grub.conf
sed -i 's/ quiet//g' /boot/grub/grub.conf
sed -i 's/ console=tty0 / serial=tty0 console=ttyS0,115200n8 /g' /boot/grub/grub.conf
</command>
</commands>
</template>

[root@openstack-server src]# oz-install -u -d3 CentOS-7-x86_64.tdl

后面的步骤跟上面制作Centos6.5版本的操作一样

----------------------------------------------------------------------------------------------------------

下面是centos6.8版本镜像制作的tdl文件模板：
[root@openstack-server src]# pwd
/usr/local/src
[root@openstack-server src]# ls CentOS-6.8-x86_64-bin-DVD1.iso
CentOS-6.8-x86_64-bin-DVD1.iso

[root@openstack-server src]# cat CentOS6u8-x86_64.tdl
<template>
<name>CentOS6u8-x86_64</name>
<description>CentOS6u8-x86_64 template</description>
<os>
<name>CentOS-6</name>
<version>8</version>
<arch>x86_64</arch>
<rootpw>PASSWORD</rootpw>
<install type='iso'>
<iso>file:///usr/local/src/CentOS-6.8-x86_64-bin-DVD1.iso</iso>
</install>
</os>
<commands>
<command name='console'>
sed -i 's/ rhgb//g' /boot/grub/grub.conf
sed -i 's/ quiet//g' /boot/grub/grub.conf
sed -i 's/ console=tty0 / serial=tty0 console=ttyS0,115200n8 /g' /boot/grub/grub.conf
</command>
</commands>
</template>

[root@openstack-server src]# oz-install -u -d3 CentOS6u8-x86_64.tdl

后面的步骤跟上面制作Centos6.5版本的操作一样

------------------------------------------------------------------------------------------------------------

下面说下使用OZ工具制作openstack虚拟化环境下的ubuntu版本镜像的过程记录：

下面以ubuntu12.04版本为例，tdl内容参考OZ在github上的模板样式。
https://github.com/rcbops/oz-image-build/tree/master/templates

[root@openstack-server src]# pwd
/usr/local/src
[root@openstack-server src]# ls ubuntu-12.04-server-amd64.iso
ubuntu-12.04-server-amd64.iso

下面ubuntu的tdl模板可直接使用~
[root@openstack-server src]# cat ubuntu-12.04_x86_64.tdl
<template>
<name>ubuntu-12.04_x86_64</name>
<description>Ubuntu 12.04 15GB template</description>
<disk>
<size>15</size> #镜像大小为15G
</disk>
<os>
<name>Ubuntu</name>
<version>12.04</version>
<arch>x86_64</arch>
<rootpw>ROOT-PW_CHANGE-ME!!!</rootpw> #root账号登录密码
<install type='iso'>
<iso>file:///usr/local/src/ubuntu-12.04-server-amd64.iso</iso>
</install>
</os>
<commands>
<command name='console'>
sed -i 's/splash//g' /etc/default/grub
sed -i 's/quiet/console=ttyS0/g' /etc/default/grub
/usr/sbin/update-grub
</command>
<command name='update'>
apt-get update
apt-get -y upgrade
echo "cloud-init cloud-init/datasources string NoCloud, OVF, Ec2" > /tmp/debconf-selections
/usr/bin/debconf-set-selections /tmp/debconf-selections
rm -f /tmp/debconf-selections
apt-get -y install cloud-init
apt-get clean
/usr/sbin/useradd -m stack
echo "stack ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers
sed -i 's/^user: ubuntu/user: stack/g' /etc/cloud/cloud.cfg
echo -n > /etc/udev/rules.d/70-persistent-net.rules
echo -n > /lib/udev/rules.d/75-persistent-net-generator.rules
</command>
</commands>
</template>

[root@openstack-server src]# oz-install -u -d3 ubuntu-12.04_x86_64.tdl
............
............

Waiting for ubuntu-12.04_x86_64 to finish installing, 1200/1200
Waiting for ubuntu-12.04_x86_64 to finish installing, 1190/1200
Waiting for ubuntu-12.04_x86_64 to finish installing, 1180/1200
Waiting for ubuntu-12.04_x86_64 to finish installing, 1170/1200

............
............
Unmounting all
Libvirt XML was written to ubuntu-12.04_x86_64Oct_31_2016-23:01:36

[root@openstack-server src]# cd /var/lib/oz/isos/
[root@openstack-server isos]# pwd
/var/lib/oz/isos
[root@openstack-server isos]# ls #发现oz下已经有了ubuntu12.04镜像
Ubuntu12.04x86_64-iso.iso

[root@openstack-server src]# cd /var/lib/libvirt/images/
[root@openstack-server images]# ls
ubuntu-12.04_x86_64.dsk
[root@openstack-server images]# virt-sysprep --add ubuntu-12.04_x86_64.dsk
[ 0.0] Examining the guest ...
...........
[ 5.0] Performing "lvm-uuids" .

[root@openstack-server images]# qemu-img info ubuntu-12.04_x86_64.dsk
image: ubuntu-12.04_x86_64.dsk
file format: raw
virtual size: 15G (16106127360 bytes)
disk size: 1.3G

[root@linux-node2 images]# glance image-list
+--------------------------------------+---------------------+
| ID | Name |
+--------------------------------------+---------------------+
| 042073da-e6cb-4b0b-97dd-1d5ef5be236a | ubuntu-12.04 |
+--------------------------------------+---------------------+

登录openstack界面，发现上面上传到openstack的ubuntu12.04镜像已经有了，镜像大小为15G。

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