Blocking ingress traffic to Docker swarm worker machines
Once a Docker Swarm Mode cluster is formed, all nodes participate in the routing mesh and accept ingress traffic. Check out how to block that feature.
A minimal TCP Client in C
Go through the steps and syscalls involved in creating a TCP client using C.
Blocking EC2 Metadata service from Docker containers in AWS
Check out how to make sure Docker containers running in AWS are unnable to access the EC2 metadata service.