October 29, 2020

Tunnels With Socat

socat is a general purpose tool for bidirectional network forwarding. You can set up a simple tunnel on localhost like:

$ socat TCP-LISTEN=5000,bind=localhost,reuseaddr,fork TCP:

You can leverage socat to link container ports, e.g. when developing kubectl-trace locally I want my docker registry to push to minikube’s registry.

$ docker run -d \
  --restart=always \
  --name='minikube-registry-proxy' \
  --network=host \
  alpine \
  ash -c "apk add socat && socat TCP-LISTEN:5000,reuseaddr,fork TCP:$(minikube ip):5000"

See https://www.redhat.com/sysadmin/getting-started-socat