
Load balancers are a good solution if you want to limit the traffic coming into your clusters. If your clusters have microservices, you can use service mesh tools like Meshery or Linkerd to secure traffic. Finally, secure your network if you’re using a cloud provider to host your clusters . If you’re using Azure Kubernetes Service (AKS), use Network Security Groups (NSGs) to manage traffic. If you’re using Amazon Elastic Kubernetes Service (EKS), it’s best to use Amazon’s Virtual Private Cloud (VPC) Security Groups.
Reducing the attack surface
Minimizing the attack surface has two benefits: increasing the speed of service and reducing the likelihood of a security breach. Using multi-stage builds, you can create lightweight images with a small attack surface and improved boot time and performance. There are several solutions for this. If you are running Linux , you can use Alpine Linux, BusyBox, or Tiny Core Linux. For Ubuntu, there is Ubuntu Minimal. You can also use Scratch, a special Docker image — essentially an open-source container — to create minimalist images from the ground up.