pstree -c -p -A $(pgrep dockerd)

The command below will list all the contents of /proc, and store the Redis PID for future use.

DBPID=$(pgrep redis-server) echo Redis is $DBPID ls /proc

Each process has it's own configuration and security settings defined within different files. ls /proc/$DBPID

For example, you can view and update the environment variables defined to that process. cat /proc/$DBPID/environ

docker exec -it db env