Hello everyone,
I’m fairly new to Rancher, Cattle and Docker.
I came across the blog entry on explaining how the catalog entry for building a MongoDB was created. However, I do not entirely understand how the data of the MongoDB gets persisted. As far as I know Docker images are stateless. Now I noticed there are two sidekicks in that catalog entry: one for configuration/scripts and the second one for data storage.
So:
- why does this work
1.1 why can Docker store the data using another Docker image? - how it is useful to have that in a separate image?
2.1. Is it, so that you can update the mongoDB image without loosing the data? - Is the data now really stored or can it still get lost?
- Sidekicks are a Rancher & Cattle solution-right? I’ve never heard of them related to Docker before
Are there more documents about sidekicks available? I only found a very short wiki article.
Can you give me any pointers?
Have a great day!