Configuration

docker.sock

• Using Node-RED in a Docker-Container

The Node-RED container must have access to the docker.sock, so you have to add the docker-group ID to the container with

docker run ... --group-add 250

the ID 250 may be different on your system.

Exposing TCP-Daemon port

• hostname hostname of docker (e.g. "localhost")
• port port of docker (e.g. "2375")

In order to expose the docker-engine TCP daemon, you have to do the following:

• Docker for Windows / Docker Desktop:
  Under Settings / General check "Expose daemon on tcp://localhost:2375 without TLS"

• Docker-CE

See https://success.docker.com/article/how-do-i-enable-the-remote-api-for-dockerd

or:

# File: /etc/default/docker
# Use DOCKER_OPTS to modify the daemon startup options.
#DOCKER_OPTS=""
DOCKER_OPTS="-H tcp://127.0.0.1:2375 -H unix:///var/run/docker.sock"

or:

# File: /lib/systemd/system/docker.service
ExecStart=/usr/bin/docker daemon -H fd:// -H tcp://0.0.0.0:2375