I formatted your message. Please, next time format your post according to the following guide: How to format your forum posts
In short: please, use </> button to share codes, terminal outputs, error messages or anything that can contain special characters which would be interpreted by the MarkDown filter. Use the preview feature to make sure your text is formatted as you would expect it and check your post after you have sent it so you can still fix it.
Example code block:
```
echo "I am a code."
echo "An athletic one, and I wanna run."
```
Looks like you want to use containers as virtual machines and install Docker in the container as you would in a VM. Don’t. Use the official dind base image and yes, you will need privileged mode as far as I know. Containers are isolated processes (mainly) and you don’t have full access to the kernel. That’s the point and containers rely on the isolation done by the kernel (kernel namespaces).