https://stackoverflow.com/questions/34878808/finding-docker-container-processes-from-host-point-of-view

docker top
docker-compose top odoo
docker inspect -f '{{.State.Pid}}' <container id>
docker inspect -f '{{.State.Pid}}' gerner_odoo_1

the process run in a docker container is a child of a process named containerd-shim (in Docker v18.09.4)

• First figure out the process IDs of the containerd-shim processes.
• For each of them, find their child process.

pgrep containerd-shim
7105
7141
7248
pgrep -P 7105