Flocker vs k8s-sidecar-injector: What are the differences?

Developers describe Flocker as "Run your databases in Docker and make them as portable as the rest of your app". Flocker is a data volume manager and multi-host Docker cluster management tool. With it you can control your data using the same tools you use for your stateless applications. This means that you can run your databases, queues and key-value stores in Docker and move them around as easily as the rest of your app. On the other hand, k8s-sidecar-injector is detailed as "Kubernetes sidecar injection service". It is a small service that runs in each Kubernetes cluster, and listens to the Kubernetes API via webhooks. For each pod creation, the injector gets a (mutating admission) webhook, asking whether or not to allow the pod launch, and if allowed, what changes we would like to make to it.

Flocker and k8s-sidecar-injector can be primarily classified as "Container" tools.

Flocker and k8s-sidecar-injector are both open source tools. Flocker with 3.19K GitHub stars and 287 forks on GitHub appears to be more popular than k8s-sidecar-injector with 143 GitHub stars and 19 GitHub forks.