The solution is to define network policies that limit pod communication to only defined assets, and to mount secrets in read-only volumes within containers instead of passing them as environment variables. Without network policies, any pod can talk to any other pod. ![]() These network policies behave like firewall rules. Default container network policiesīy default, Kubernetes deployments do not apply a network policy to a pod-the smallest unit of a Kubernetes application. The solution is to track traffic moving between namespaces, deployments, and pods and determine how much of that traffic is actually allowed. In a sprawling container environment, implementing network segmentation can be prohibitively difficult given the complexity of configuring such policies manually. If a container is breached, the ability for a hacker to move within the environment is directly related to how broadly that container can communicate with other containers and pods. Uninhibited container communicationĬontainers and pods need to talk to each other within deployments, as well as to other internal and external endpoints to properly function. And only images from allowed image registries should be used to launch containers in a Kubernetes environment. ![]() Base images need to be regularly tested, approved, and scanned. The solution is to set up policies determining how images are built, and how they’re stored in image registries. Newly copied container images can then be modified to serve distinct purposes. Container images (also known as base images) are immutable templates used to create new containers.
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June 2023
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