run existing container docker code example
Example 1: docker access container
docker exec -it <mycontainer> bash
docker exec -it <mycontainer> sh ##for alpine
Example 2: how to start docker
systemctl start docker.service
#(OR)
systemctl start docker
# it will start docker
Example 3: how to bash into docker container
docker exec -it nginx /bin/bash
Example 4: docker how to run existing container
docker start <container-name/ID>