问题描述
我使用ec2实例附带的临时存储将数据库保存在/ mnt。要使用ec2 api工具进行备份，我们需要一个卷ID，但是在aws控制台中，我只能找到8gb根存储的卷ID。
I have my db kept at /mnt, using ephemeral storage that comes with ec2 instance. To take the backup using ec2 api tools we need a volume id, but in the aws console I can find the volume id of only the 8gb root storage.
如果要备份临时存储该怎么办？
What should I do if want the backup of ephemeral storage? Is there any alternative for backing up instance storage?
推荐答案
首先，您应该永远不要存储任何持久值在中的临时存储上，除非您确切知道自己在做什么和准备随时进行时间点备份等。-您的问题似乎表示您可能对于临时存储的概念有所误解，和及其对数据安全性和备份要求的重大影响：
First and foremost, you should never store anything of lasting value on ephemeral storage in Amazon EC2, except if you know exactly what you are doing and are prepared to always have point in time backups etc. - your question seems to indicate that you might be mistaken about the concept of ephemeral storage, the respective difference between Amazon EC2 Instance Storage an Amazon EBS and the significant implications regarding data safety and backup requirements:
临时存储在停止/启动周期会丢失和通常可以消失，因此您绝对不希望在其中放置任何持久的价值，即仅在其中放置您可以承受得起的轻松丢失或重建的临时数据，例如交换文件或在计算过程中使用的严格临时数据。当然，例如，您可能在那里存储了巨大的索引，但是必须出于任何原因（实例重新启动，硬件故障等）清除存储之后，必须准备好重建这些索引。
Ephemeral storage will be lost on stop/start cycles and can generally go away, so you definitely don't want to put anything of lasting value there, i.e. only put temporary data there you can afford to lose or rebuild easily, like a swap file or strictly temporary data in use during computations. Of course you might store huge indexes there for example, but must be prepared to rebuild these after the storage has been cleared for whatever reason (instance reboot, hardware failure, ...).
- 这是Eric Hammond在），它概述了这两种存储概念的历史和差异，并评估了临时存储的剩余优点（主要是丰富而免费的）。
- That's one of the many reasons Eric Hammond excellently summarized in You Should Use EBS Boot Instances on Amazon EC2), which outlines the history of and differences between the two storage concepts and assesses the few remaining possible benefits of ephemeral storage (mainly being plentiful and free).
这些说明应阐明为什么您无法备份临时存储卷具有仅适用于EBS卷（即EBS快照）的机制。因此，您可以通过选择的常规操作系统级备份工具来备份前者，其中很受欢迎例如，选择可以方便地，正如我对。
These explanations should clarify why you are unable to backup the ephemeral storage volumes with a mechanism that solely applies to EBS volumes (i.e. EBS snapshots). Accordingly, you can backup the former via regular operating system level backup tool of your choice, with Duplicity being a popular choice optionally facilitating Amazon S3 for example, as addressed in my answer to Easiest to use backup software for live linux server.
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