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OPA Gatekeeper: Globally restrict it's scope to selected namespaces
2 min read
To prevent OPA Gatekeeper to apply rules to some namespaces we can add exclusions at the rule level but this can be very inconvenient since we would need to add it to every single rule. A change on these exclusion list can be a pain as well.
We can configure the ValidatingWebhookConfiguration to restrict it globally to namespaces that have a some label.
23/11/2022
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Run commands impersonating another user or ServiceAccount
2 min read
To be able to test permissions it can be convenient to have our own user being able to impersonate other users (and ServiceAccounts as well). To do we we'll have to use the impersonate verb as follows:
- apiGroups: [""] resources: ["users", "groups", "serviceaccounts"] verbs: ["impersonate"]22/11/2022
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Kubernetes: Generate a CRD definition from an object
2 min read
Let's face it, manually define a openAPIV3Schema definition is no easy task, so why not automating it? We can use this online CRD generator to be able to create it's definition from one sample object
21/11/2022
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Exclude certain namespaces from a OPA gatekeeper rule
2 min read
While some policies can be safely applied to all the namespaces of a cluster, some other can become problematic since they can interfere with the normal operations of certain controllers. When we create a constrain rule we can exclude some namespaces using the spec.match.excludedNamespaces attribute
18/11/2022
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Kubernetes: Configure privilege escalation using the escalate and bind verbs
2 min read
The RBAC API prevents privilege escalation at the API level when creating or updating ClusterRole, ClusterRoleBinding, Role and RoleBinding. However, we can configure it to allow privilege escalation using the escalate and bind verbs.
15/11/2022
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Kubernetes:
container orchestration
