Question

Can I have NET_ADMIN capability in Kubernetes?

Linkerd is in Digital Ocean Kubernetes’ product page (Use Kubernetes Tooling). However, when I run “linkerd check --pre”, I get:

pre-kubernetes-capability
-------------------------
× has NET_ADMIN capability
    found 2 PodSecurityPolicies, but none provide NET_ADMIN
    see https://linkerd.io/checks/#pre-k8s-cluster-net-admin for hints

Is it possible to install Linkerd in DO managed Kubernetes?


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Accepted Answer

Hi @csantos,

You should be able to use Linkerd today, our DOKS clusters do have NET_ADMIN capability by default.

What version is the cluster that you created? Are the other checks passing, did you only paste the failure?

I confirmed on 3 of our latest patch versions for 1.12, 1.13, and 1.14. Using https://linkerd.io/2/getting-started/ after spinning up a DOKS cluster I am seeing all pre-checks pass:

$ linkerd check --pre
kubernetes-api
--------------
√ can initialize the client
√ can query the Kubernetes API

kubernetes-version
------------------
√ is running the minimum Kubernetes API version
√ is running the minimum kubectl version

pre-kubernetes-setup
--------------------
√ control plane namespace does not already exist
√ can create Namespaces
√ can create ClusterRoles
√ can create ClusterRoleBindings
√ can create CustomResourceDefinitions
√ can create ServiceAccounts
√ can create Services
√ can create Deployments
√ can create ConfigMaps

pre-kubernetes-capability
-------------------------
√ has NET_ADMIN capability

linkerd-version
---------------
√ can determine the latest version
√ cli is up-to-date

Status check results are √

After installing linkerd manifests I’m seeing all checks pass:

$ linkerd check
kubernetes-api
--------------
√ can initialize the client
√ can query the Kubernetes API

kubernetes-version
------------------
√ is running the minimum Kubernetes API version
√ is running the minimum kubectl version

linkerd-existence
-----------------
√ control plane namespace exists
√ controller pod is running
√ can initialize the client
√ can query the control plane API

linkerd-api
-----------
√ control plane pods are ready
√ control plane self-check
√ [kubernetes] control plane can talk to Kubernetes
√ [prometheus] control plane can talk to Prometheus
√ no invalid service profiles

linkerd-version
---------------
√ can determine the latest version
√ cli is up-to-date

control-plane-version
---------------------
√ control plane is up-to-date
√ control plane and cli versions match

Status check results are √

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