openstack虚拟机导出为镜像文件
Ceilometer listens on notifications topic of rabbitmq by default, if glance sets its rabbit_notification_topic to something else, the ceilometer-collector will not able to consume the message, which leads to no sample data will be found for image operations. This post records how I find this issue.
The official guide which named openstack-manuals has poor content for ceilometer installation, see http://docs.openstack.org/havana/install-guide/install/zypper/content/ceilometer-install-swift.html, here I record my experience of enabling monitor swift meter on sles 11 sp3 for openstack havana.
This post records some entries for Ceilometer Havana problems and bugs. They mostly are on SLES 11 SP3 and Ubuntu 12.04.
The ceilometer-api serves its application via wsgiref.simple_server module, which depends on BaseHTTPServer, which will do a reverse DNS query when log message. In some network environment, it will cause around 10 seconds useless latency. Patch BaseHTTPServer.BaseHTTPRequestHandler.address_string will solve this issue.
MarkDown is an excellent mark up language, and Pandoc is famous as swiss-army knife in file format convertion field. This post introduces the basic usage of Pandoc with MarkDown extensions, which can be used for software document generation.
VCS (Version Control System) is really powerful in programming, and furthermore, all the documents including design, manual, FAQ, and etc can be versioned too. This post introduces a basic solution for such purpose.
If you’re using SLES 11 SP3 to install Ceilometer Havana with mongodb as storage backend, there may be a problem that ceilometer-collector cannot store received data. It is because ceilometer-collector couldn’t connect to mongodb, restart the collector service will temporarily solve the problem, but ensure mongodb is available before ceilometer-collector start is very important at the system boot time.
OpenStack现在的API文档写得并不尽善尽美，有时候官方的例子也许有错误或者不完善，你可以google得到你想要的答案或者到社区求助，或者如果你手头刚好有个部署好的环境，你也可以打开cli接口的–debug选项，运行cli命令时就会把http交互过程打印出来
If you don’t have (or don’t want to use) USB device or RW-CD-ROM to install operating system, you can do that via hard disk. This post introduces a way to install OS by grub which is verified on Ubuntu Precise.