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kubernetes: replace deprecated seccomp annotations with securityContext 

Kubernetes added the official `securityContext.seccompProfile` support in Kubernetes 1.19.
Seccomp is still disabled by default.

The legacy `container.seccomp.security.alpha.kubernetes.io/<PODNAME>` annotation has been deprecated and will be unsupported in Kubernetes 1.25.
https://kubernetes.io/docs/tutorials/security/seccomp/

A test cluster can be created with the following minikube command:
```
minikube start --feature-gates SeccompDefault=true --extra-config kubelet.seccomp-default=true
```

Related to moby/buildkit PR 2782

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
This commit is contained in:
Akihiro Suda 2022-04-07 17:23:42 +09:00
parent a60150cbc6
commit add4301ed6
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2 changed files with 7 additions and 4 deletions
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2
docs/reference/buildx_create.md
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@ -141,7 +141,7 @@ Passes additional driver-specific options. Details for each driver:
- `limits.memory` - Sets the limit memory value specified in bytes or with a valid suffix. Example `limits.memory=500Mi`, `limits.memory=4G`
- `nodeselector="label1=value1,label2=value2"` - Sets the kv of `Pod` nodeSelector. No Defaults. Example `nodeselector=kubernetes.io/arch=arm64`
- `tolerations="key=foo,value=bar;key=foo2,operator=exists;key=foo3,effect=NoSchedule"` - Sets the `Pod` tolerations. Accepts the same values as the kube manifest tolerations. Key-value pairs are separated by `,`, tolerations are separated by `;`. No Defaults. Example `tolerations=operator=exists`
- `rootless=(true|false)` - Run the container as a non-root user without `securityContext.privileged`. [Using Ubuntu host kernel is recommended](https://github.com/moby/buildkit/blob/master/docs/rootless.md). Defaults to false.
- `rootless=(true|false)` - Run the container as a non-root user without `securityContext.privileged`. Needs Kubernetes 1.19 or later. [Using Ubuntu host kernel is recommended](https://github.com/moby/buildkit/blob/master/docs/rootless.md). Defaults to false.
- `loadbalance=(sticky|random)` - Load-balancing strategy. If set to "sticky", the pod is chosen using the hash of the context path. Defaults to "sticky"
- `qemu.install=(true|false)` - Install QEMU emulation for multi platforms support.
- `qemu.image=IMAGE` - Sets the QEMU emulation image. Defaults to `tonistiigi/binfmt:latest`

9
driver/kubernetes/manifest/manifest.go
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@ -204,12 +204,15 @@ func toRootless(d *appsv1.Deployment) error {
d.Spec.Template.Spec.Containers[0].Args,
"--oci-worker-no-process-sandbox",
)
d.Spec.Template.Spec.Containers[0].SecurityContext = nil
d.Spec.Template.Spec.Containers[0].SecurityContext = &corev1.SecurityContext{
SeccompProfile: &corev1.SeccompProfile{
Type: corev1.SeccompProfileTypeUnconfined,
},
}
if d.Spec.Template.ObjectMeta.Annotations == nil {
d.Spec.Template.ObjectMeta.Annotations = make(map[string]string, 2)
d.Spec.Template.ObjectMeta.Annotations = make(map[string]string, 1)
}
d.Spec.Template.ObjectMeta.Annotations["container.apparmor.security.beta.kubernetes.io/"+containerName] = "unconfined"
d.Spec.Template.ObjectMeta.Annotations["container.seccomp.security.alpha.kubernetes.io/"+containerName] = "unconfined"
return nil
}