OpenStack Heat服务再介绍（二）

问题导读：
1、与Heat交互的模块有哪些？

2、Stack管理的是什么服务？

Heat的安装，配置以及核心概念

Heat作为相对独立的模块建立在其他模块之上。Havana版中主要与Heat交互的模块是Nova和Ceilometer。下一版本IceHouse还会有Swift,Glance, Neutron。

安装和配置篇
推荐的安装方式是用Redhat的packstack或Ubuntu的Juju直接安装，因为Heat在Havana 版本已经是正式的模块了。我主要用的是Redhat RDO，所以一条命令就能搞定。

packstack--install-hosts=x.x.x.x,x.x.x.x--os-heat-install=y
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如果你是在Grizzly版上装就只能手动安装了。

gitclone git://github.com/openstack/heat.git
cd heat; gitcheckout remotes/origin/stable/grizzly
git checkout–b grizzly
yum install -y libxslt-develpython-devel gcc python-pip
pythonsetup.py install
./install.sh
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配置Heat
1、yum install -ypython-paste-deploy.noarch python-routes.noarch
2、source/root/keystonerc_admin
3、打开heat/bin/heat-keystone-setup，修改201行:

SERVICE_TENANT=$(get_data 2 service 1keystone tenant-list)
to:
SERVICE_TENANT=$(get_data 2 services 1keystone tenant-list)
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4、执行heat/bin/heat-keystone-setup，创建heat用户
5、'catpackstack-answers-20130912-124830.txt |grep MYSQL'. 拿到mysql的密码，这个用来创建heat的数据库.

CONFIG_MYSQL_PW=4ad9837a8e5e473a
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6、heat/bin/heat-db-setup rpm. 脚本会让你输入密码，在这个例子里面密码就是 '4ad9837a8e5e473a'.

Installing on an RPM system.
Please enter the password for the 'root' MySQL user:
Verified connectivity to MySQL.
Creating 'heat' database.
/usr/lib64/python2.6/site-packages/SQLAlchemy-0.7.8-py2.6-linux-x86_64.egg/sqlalchemy/pool.py:683:SADeprecationWarning: The 'listeners' argument to Pool (and create_engine()) isdeprecated.  Use event.listen().
  Pool._init_(self,creator, **kw)
/usr/lib64/python2.6/site-packages/SQLAlchemy-0.7.8-py2.6-linux-x86_64.egg/sqlalchemy/pool.py:159:SADeprecationWarning: Pool.add_listener is deprecated.  Use event.listen()
  self.add_listener(l)
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7.配置

`cat keystonerc_admin |grep OS_PASSWORD`, 修改/etc/heat/heat-api-paste.ini:
admin_tenant_name= services <-- orignial it is 'service'
admin_password =7d1642ae2c1c4aff
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8. 修改/etc/heat/heat-api-cfn-paste.ini，/etc/heat/heat-api-cloudwatch-paste.ini里的admin_tenant_name and admin_password.

9. 把heat-engine.conf中的heat_metadata_server_url,heat_waitcondition_server_url, heat_watch_server_url从127.0.0.1改成你机器的外网ip

10. yum install -y python-heatclient

11. 启动Heat:

heat-api &
heat-engine &
heat-api-cfn &
heat-cloud-watch &
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启动第一个stack
Stack这个概念来源于AWS，Stack管理的是resource。而resource是个抽象的概念，它可以是虚拟机，可以是网络等等。Stack就是Heat管理应用程序的逻辑单元。
1. 从http://fedorapeople.org/groups/heat/prebuilt-jeos-images/中下载F17-x86_64-cfntools.qcow2, 然后用glance把它导入：

glanceimage-create --name=F17-x86_64-cfntools --disk-format=qcow2--container-format=bare < /var/lib/libvirt/images/F17-x86_64-cfntools.qcow2
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2. 通过Horizon或者命令行注册一个SSH key-pair,下面的例子生成root_key

novakeypair-add --pub_key ~/.ssh/id_rsa.pub root_key
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3. git clone [img]https://github.com/openstack/heat-templates.git'Description:http://wikicentral.cisco.com/images/icons/linkext7.gif[/img], 从这里可以下载很多heat的参考模版

4. 创建名为demo的Stack

heatstack-create demo --template-file=/root/heat-templates/cfn/F17/getting_started.template --parameters="KeyName=root_key"
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5. 观察stack启动的状态

# heat list
+--------------------------------------+------------+-----------------+----------------------+
| id                                   | stack_name | stack_status    | creation_time        |
+--------------------------------------+------------+-----------------+----------------------+
| 543b64c7-3165-4939-a249-ba68d8cb54b0 | demo       | CREATE_COMPLETE | 2013-10-21T10:03:06Z |
+--------------------------------------+------------+-----------------+----------------------+
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heat resource-list 543b64c7-3165-4939-a249-ba68d8cb54b0
+---------------------+---------------------------------------+-----------------+----------------------+
| logical_resource_id | resource_type                         | resource_status | updated_time         |
+---------------------+---------------------------------------+-----------------+----------------------+
| JsmLaunchConfig     | AWS::AutoScaling::LaunchConfiguration | CREATE_COMPLETE | 2013-10-21T10:03:06Z |
| CfnUser             | AWS::IAM::User                        | CREATE_COMPLETE | 2013-10-21T10:03:07Z |
| VcsKeys             | AWS::IAM::AccessKey                   | CREATE_COMPLETE | 2013-10-21T10:03:17Z |
| CPUAlarmHigh        | AWS::CloudWatch::Alarm                | CREATE_COMPLETE | 2013-10-21T10:03:35Z |
| CPUAlarmLow         | AWS::CloudWatch::Alarm                | CREATE_COMPLETE | 2013-10-21T10:03:35Z |
| JsmScaleUpPolicy    | AWS::AutoScaling::ScalingPolicy       | CREATE_COMPLETE | 2013-10-21T11:13:20Z |
| VM                  | AWS::AutoScaling::AutoScalingGroup    | CREATE_COMPLETE | 2013-10-21T11:18:55Z |
| JsmScaleDownPolicy  | AWS::AutoScaling::ScalingPolicy       | CREATE_COMPLETE | 2013-10-28T12:52:40Z |
+---------------------+---------------------------------------+-----------------+----------------------+
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