By configuring your Docker containers to talk to a custom DNS server, you gain more control over how your container look up other services – database, other microservices, etc., It turns out Docker networking isn’t completely straight forward. On Linux you can: Run a DNS server locally, either dnsmasq or devdns Run your container with --dns 172.17.0.1, the magic IP where your host machine is located Configure dnsmasq from step 1 via /etc/hosts Sadly, none of it was easy.

I still find it hard to believe how easy it is to run your own infrastructure in the cloud. Running a Docker registry is as simple as adding a few lines of code to your Terraform configuration. resource "aws_ecr_repository" "foo" { name = "bar" image_tag_mutability = "MUTABLE" image_scanning_configuration { scan_on_push = true } } When deployed, this create an registry where you can manage multiple Docker repositories. You can upload a Docker image to be used in your private ECS cluster: