Pod security policy control is implemented as an optional (but ... First, a Role or ClusterRole needs to grant access to use the desired policies. ... This is the least restrictive policy you can create, equivalent to not using the pod ...
There are a myriad of ways to secure a Kubernetes cluster, whether through implementing Network Policies to control ingress/egress traffic, Role Based Access Control, or multi-tenancy. One of the most effective ways to manage what gets run on your cluster is through the creation of Pod Security Policies.
A Pod Security Policy defines a set of conditions a pod must run with in order to run on the cluster. These conditions span host-level access, to a range of UIDs a container can run as, and even what volumes a pod can use.
In this article, I will lay out a blueprint for applying a secure-first mindset for your cluster through the implementation of Pod Security Policies. With a secure or restricted-first mindset, you will by default, lock-down your cluster to run secure workloads and through review, make exceptions for those workloads which require privileged access.
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