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> docker has a daemon that exposes an HTTP API

This API has to enabled explicitly. Docker daemon works by using a unix socket instead ( "/var/run/docker.sock" ).

> acts more or less like an init for containers

There is Docker daemon and there is Docker CLI. Both have separate scopes.

> There is Docker daemon and there is Docker CLI. Both have separate scopes.

Docker CLI is glorified curl, everything happens in the daemon (containerd being logically -- but finally not physically -- part of the daemon).

The unix socket actually serves an HTTP api (just not over tcp) as well, so the statement was true either way.