Docker Daemon

The Docker daemon can listen for Docker Remote API requests via three different types of Socket: unix, tcp, and fd

unix  :- /var/run/docker.sock  (default)

tcp :- for remote access, support tls1.0  i.e.
-H tcp://0.0.0.0:2375         # for all IP address
-H tcp://192.168.59.103:2375   # specific IP address
*** Docker daemon: 2375 (non-secure), 2376 (secure)

fd :- socket activated files  i.e.
-H fd://
-H fd://3

Can specific multiple socket like this
dockerd -H unix:///var/run/docker.sock -H tcp://192.168.59.106 -H tcp://10.10.10.2