zsh: command not found: dockerd

I have docker installed on my device

I am facing two issues

1. I was running dockerd --dns , I received

   zsh: command not found: dockerd

2. I am unable to call AWS RDS database from application inside docker container.

docker run -p 1078:5001 -t test

Can someone please help? I am new to CICD, Docker and Kubernetes.