libcloud 文档阅读

[ldl](member:ldl): From doc: https://developer.openstack.org/firstapp-libcloud/introduction.html
[03:08am] [ldl](member:ldl): It is easy to split out services into multiple instances. We will create a controller instance called app-controller, which hosts the API, database, and messaging services. We will also create a worker instance called app-worker-1, which just generates fractals.
[03:08am] [ldl](member:ldl): what's the meaning of fractal?
[03:08am] [ldl](member:ldl): does it means the instance?
[03:08am] [ldl](member:ldl): and app-worker-1 means compute node?

我估计是。

2.对实例和卷做快照备份。

You can also use the OpenStack API to create snapshots of running instances and persistent volumes. For more information, see your SDK documentation.

3.如果一个实例受了损坏，被攻击，那么所有的使用相同的镜像和配置的实例都会受损。
最好的方法是重建。

If one application instance is compromised, all instances with the same image and configuration will likely suffer the same vulnerability. The safest path is to use configuration management to rebuild all instances.