使用OpenStack遇到的问题
openstack的相关包：
First you have to import several GPG public keys:
rpm –import http://download.openSUSE.org/repositories/isv:/B1-Systems:/OpenStack:/release:/Essex/SLE_11_SP2/repodata/repomd.xml.key
rpm –import http://download.opensuse.org/repositories/isv:/B1-Systems:/OpenStack:/release:/Essex:/requirements/SLE_11_SP2/repodata/repomd.xml.key
Then you can add the repositories using zypper:
zypper ar http://download.opensuse.org/repositories/isv:/B1-Systems:/OpenStack:/release:/Essex/SLE_11_SP2/isv:B1-Systems:OpenStack:release:Essex.repo
zypper ar http://download.opensuse.org/repositories/isv:/B1-Systems:/OpenStack:/release:/Essex:/requirements/SLE_11_SP2/isv:B1-Systems:OpenStack:release:Essex:requirements.repo
其它依赖包：
zypper ar http://download.opensuse.org/repositories/isv:/B1-Systems:/OpenStack:/requirements/SLE_11_SP2/isv:B1-Systems:OpenStack:requirements.repo
RabbitMQ软件包：
You can find an up to date version of RabbitMQ in the project “isv:B1-Systems:OpenStack:tools:rabbitmq” for SLES11 SP2 and openSUSE 12.1. Add the public GPG key and the repository on your queuing system this way:
SLES11 SP2(rabbitmq-server)
rpm –import http://download.opensuse.org/repositories/isv:/B1-Systems:/OpenStack:/tools:/rabbitmq/SLE_11_SP2/repodata/repomd.xml.key
zypper ar http://download.opensuse.org/repositories/isv:/B1-Systems:/OpenStack:/tools:/rabbitmq/SLE_11_SP2/isv:B1-Systems:OpenStack:tools:rabbitmq.repo
在自己安装的过程中也遇到了不少问题，我列出了一些我碰到过的问题和我现在没解决的问题，如果哪位大侠走过就指点一下，谢谢！
1.安装完openstack-nova-compute后没有日志输出：
缺少python依赖包，安装依赖包
python-repoze.lru-0.3-1.1.x86_64.rpm
2.安装完nova-compute后启动服务：
此时如果没有初始化数据会报告一个无法查询数据库的错误。
解决方法：
配置nova.conf的nova数据库，并使用nova-manage db sync初始化数据库。
3.配置libvirt和libvirt_type，启动nova-compute，出现问题:
2012-04-13 23:56:24 AUDIT nova.service [-] Starting compute node (version 2012.1-LOCALBRANCH:LOCALREVISION)
2012-04-13 23:56:24 CRITICAL nova [-] [Errno 2] No such file or directory: ‘/usr/lib64/python2.6/site-packages/instances’
解决方法，创建目录：
mkdir -p /usr/lib64/python2.6/site-packages/instances
4.nova-compute启动时出现：
2012-04-15 18:25:18 TRACE nova raise exception.ClassNotFound(class_name=class_str, exception=exc)
2012-04-15 18:25:18 TRACE nova ClassNotFound: Class API could not be found: No module named glance.common
2012-04-15 18:25:18 TRACE nova
解决方法：(安装缺少的python包)
Installing: python-dateutil-1.5-1.1 [done]
Installing: python-pycrypto-2.5-1.1 [done]
Installing: python-passlib-1.5.3-1.1 [done]
Installing: python-xattr-0.6.2-1.1 [done]
Installing: python-PasteScript-1.7.5-1.1 [done]
Installing: python-python-memcached-1.47-1.1 [done]
Installing: libmysqlclient_r15-5.0.94-0.2.4.1 [done]
Installing: python-ldap-2.3.5-1.21 [done]
Installing: python-mysql-1.2.2-2.12 [done]
Installing: python-keystone-2012.1-1.1 [done]
5.安装完成后启动nova-compute，启动，nova-compute日志
2012-04-15 19:51:06 TRACE nova File “/usr/lib64/python2.6/site-packages/sqlalchemy/engine/default.py”, line 330, in do_execute
2012-04-15 19:51:06 TRACE nova cursor.execute(statement, parameters)
2012-04-15 19:51:06 TRACE nova File “/usr/lib64/python2.6/site-packages/MySQLdb/cursors.py”, line 166, in execute
2012-04-15 19:51:06 TRACE nova self.errorhandler(self, exc, value)
2012-04-15 19:51:06 TRACE nova File “/usr/lib64/python2.6/site-packages/MySQLdb/connections.py”, line 35, in defaulterrorhandler
2012-04-15 19:51:06 TRACE nova raise errorclass, errorvalue
目前来看nova数据库需要连接后数据库还没初始化。
解决方法，初始化nova数据库：
susesp2:/var/log/nova # nova-manage db sync
2012-04-15 20:02:45 DEBUG nova.utils [-] backend <module ‘nova.db.sqlalchemy.migration’ from ‘/usr/lib64/python2.6/site-packages/nova/db/sqlalchemy/migration.pyc’> from (pid=10941) __get_backend /usr/lib64/python2.6/site-packages/nova/utils.py:658
2012-04-15 20:03:23 WARNING nova.utils [-] /usr/lib64/python2.6/site-packages/nova/db/sqlalchemy/migrate_repo/versions/075_convert_bw_usage_to_store_network_id.py:49: SADeprecationWarning: useexisting is deprecated. Use extend_existing.
useexisting=True)
2012-04-15 20:03:31 WARNING nova.utils [-] /usr/lib64/python2.6/site-packages/nova/db/sqlalchemy/migrate_repo/versions/081_drop_instance_id_bw_cache.py:40: SADeprecationWarning: useexisting is deprecated. Use extend_existing.
useexisting=True)
6.libvirt连接错误：
2012-04-15 20:24:08 TRACE nova File “/usr/lib64/python2.6/site-packages/libvirt.py”, line 2836, in getVersion
2012-04-15 20:24:08 TRACE nova if ret == -1: raise libvirtError (‘virConnectGetVersion() failed’, conn=self)
2012-04-15 20:24:08 TRACE nova libvirtError: internal error Cannot find suitable emulator for x86_64
解决方法：
Essex默认配置nova.conf的libvirt_type=”xen”默认配置文件中需要有引号，无法读取，解决方式，libvirt_type=xen这样即可。