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feat(injector): add ephemeral-storage resource request/limit for side…
…cars (#8882) Signed-off-by: Jay Chen <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,129 @@ | ||
| package injector | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
|
|
||
| "github.com/go-logr/logr" | ||
| "github.com/pkg/errors" | ||
| kube_core "k8s.io/api/core/v1" | ||
| kube_types "k8s.io/apimachinery/pkg/types" | ||
|
|
||
| mesh_k8s "github.com/kumahq/kuma/pkg/plugins/resources/k8s/native/api/v1alpha1" | ||
| "github.com/kumahq/kuma/pkg/plugins/runtime/k8s/metadata" | ||
| k8s_util "github.com/kumahq/kuma/pkg/plugins/runtime/k8s/util" | ||
| ) | ||
|
|
||
| func (i *KumaInjector) preCheck(ctx context.Context, pod *kube_core.Pod, logger logr.Logger) (string, error) { | ||
| ns, err := i.namespaceFor(ctx, pod) | ||
| if err != nil { | ||
| return "", errors.Wrap(err, "could not retrieve namespace for pod") | ||
| } | ||
|
|
||
| // Log deprecated annotations | ||
| for _, d := range metadata.PodAnnotationDeprecations { | ||
| if _, exists := pod.Annotations[d.Key]; exists { | ||
| logger.Info("WARNING: using deprecated pod annotation", "key", d.Key, "message", d.Message) | ||
| } | ||
| } | ||
|
|
||
| if inject, err := i.needToInject(pod, ns); err != nil { | ||
| return "", err | ||
| } else if !inject { | ||
| logger.V(1).Info("skipping Kuma injection") | ||
| return "", nil | ||
| } | ||
|
|
||
| meshName := k8s_util.MeshOfByAnnotation(pod, ns) | ||
| logger = logger.WithValues("mesh", meshName) | ||
| // Check mesh exists | ||
| if err := i.client.Get(ctx, kube_types.NamespacedName{Name: meshName}, &mesh_k8s.Mesh{}); err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| // Warn if an init container in the pod is using the same UID as the sidecar. This traffic will be exempt from | ||
| // redirection and may be unintended behavior. | ||
| for _, c := range pod.Spec.InitContainers { | ||
| if c.SecurityContext != nil && c.SecurityContext.RunAsUser != nil { | ||
| if *c.SecurityContext.RunAsUser == i.cfg.SidecarContainer.UID { | ||
| logger.Info( | ||
| "WARNING: init container using ignored sidecar UID", | ||
| "container", | ||
| c.Name, | ||
| "uid", | ||
| i.cfg.SidecarContainer.UID, | ||
| ) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| var duplicateUidContainers []string | ||
| // Error if a container in the pod is using the same UID as the sidecar. This scenario is not supported. | ||
| for _, c := range pod.Spec.Containers { | ||
| if c.SecurityContext != nil && c.SecurityContext.RunAsUser != nil { | ||
| if *c.SecurityContext.RunAsUser == i.cfg.SidecarContainer.UID { | ||
| duplicateUidContainers = append(duplicateUidContainers, c.Name) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| if len(duplicateUidContainers) > 0 { | ||
| err := fmt.Errorf( | ||
| "containers using same UID as sidecar is unsupported: %q", | ||
| duplicateUidContainers, | ||
| ) | ||
|
|
||
| logger.Error(err, "injection failed") | ||
|
|
||
| return "", err | ||
| } | ||
| return meshName, nil | ||
| } | ||
|
|
||
| func (i *KumaInjector) needToInject(pod *kube_core.Pod, ns *kube_core.Namespace) (bool, error) { | ||
| log.WithValues("name", pod.Name, "namespace", pod.Namespace) | ||
| if i.isInjectionException(pod) { | ||
| log.V(1).Info("pod fulfills exception requirements") | ||
| return false, nil | ||
| } | ||
|
|
||
| for _, container := range pod.Spec.Containers { | ||
| if container.Name == k8s_util.KumaSidecarContainerName { | ||
| log.V(1).Info("pod already has Kuma sidecar") | ||
| return false, nil | ||
| } | ||
| } | ||
|
|
||
| enabled, exist, err := metadata.Annotations(pod.Labels).GetEnabled(metadata.KumaSidecarInjectionAnnotation) | ||
| if err != nil { | ||
| return false, err | ||
| } | ||
| if exist { | ||
| if !enabled { | ||
| log.V(1).Info(`pod has "kuma.io/sidecar-injection: disabled" label`) | ||
| } | ||
| return enabled, nil | ||
| } | ||
|
|
||
| enabled, exist, err = metadata.Annotations(ns.Labels).GetEnabled(metadata.KumaSidecarInjectionAnnotation) | ||
| if err != nil { | ||
| return false, err | ||
| } | ||
| if exist { | ||
| if !enabled { | ||
| log.V(1).Info(`namespace has "kuma.io/sidecar-injection: disabled" label`) | ||
| } | ||
| return enabled, nil | ||
| } | ||
| return false, err | ||
| } | ||
|
|
||
| func (i *KumaInjector) isInjectionException(pod *kube_core.Pod) bool { | ||
| for key, value := range i.cfg.Exceptions.Labels { | ||
| podValue, exist := pod.Labels[key] | ||
| if exist && (value == "*" || value == podValue) { | ||
| return true | ||
| } | ||
| } | ||
| return false | ||
| } |
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