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handle pod-infra-container-image on older versions #1596

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Feb 1, 2024
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Merged

handle pod-infra-container-image on older versions #1596

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76802d3
handle pod-infra-container-image on older versions
ndbaker1 Jan 29, 2024
a200bde
remove version requirement for adding flag
ndbaker1 Jan 29, 2024
f9849b4
remove pod infra flag on 1.29+ since its a noop
ndbaker1 Jan 31, 2024
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36 changes: 36 additions & 0 deletions nodeadm/internal/kubelet/config.go
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Original file line number Diff line number Diff line change
Expand Up @@ -240,6 +240,38 @@ func (ksc *kubeletConfig) withDefaultReservedResources() {
ksc.KubeReservedCgroup = ptr.String("/runtime")
}

// withPodInfraContainerImage determines whether to add the
// '--pod-infra-container-image' flag, which is used to ensure the sandbox image
// is not garbage collected.
//
// TODO: revisit once the minimum supportted version catches up or the container
// runtime is moved to containerd 2.0
func (ksc *kubeletConfig) withPodInfraContainerImage(cfg *api.NodeConfig, kubeletVersion string, flags map[string]string) error {
// the flag is a noop on 1.29+, since the behavior was changed to use the
// CRI image pinning behavior and no longer considers the flag value.
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@Issacwww Issacwww Feb 1, 2024 •
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IIUC, we also need to add #1605 and #1601 into al2023 to help with 1.29 right?

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yea, it looks like we will need the crictl for sure in some equivalent fashion. Am i missing any go libraries to pull the image through the CRI versus crictl?

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@ndbaker1 ndbaker1 Feb 1, 2024 •
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i could use the same upstream resources to pull this to remove the cri-tools install,
it would look something like:

import (
	v1 "k8s.io/cri-api/pkg/apis/runtime/v1"
	"k8s.io/kubernetes/pkg/kubelet/cri/remote"
)

imageManager, err := remote.NewRemoteImageService("unix:///run/containerd/containerd.sock", 2*time.Second, nil)
imageSpec := v1.ImageSpec{Image: sandboxImage}
authConfig := v1.AuthConfig{Username: "AWS", Password: ecrUserToken}
imageRef, err := imageManager.PullImage(context.TODO(), &imageSpec, &authConfig, nil)

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Chatted offline, I think it's a good idea for nodeadm to bake in this functionality but we need to find the right CRI client library to use (pulling in kubelet internals should be a last resort)

// see: https://github.com/kubernetes/kubernetes/pull/118544
if semver.Compare(kubeletVersion, "v1.29.0") < 0 {
awsDomain, err := util.GetAwsDomain(context.TODO(), imds.New(imds.Options{}))
if err != nil {
return err
}
ecrUri, err := util.GetEcrUri(util.GetEcrUriRequest{
Region: cfg.Status.Instance.Region,
Domain: awsDomain,
AllowFips: true,
})
if err != nil {
return err
}
pauseContainerImage, err := util.GetPauseContainer(ecrUri)
if err != nil {
return err
}
flags["pod-infra-container-image"] = pauseContainerImage
}
return nil
}

func (k *kubelet) GenerateKubeletConfig(cfg *api.NodeConfig) (*kubeletConfig, error) {
// Get the kubelet/kubernetes version to help conditionally enable features
kubeletVersion, err := GetKubeletVersion()
Expand All @@ -249,6 +281,7 @@ func (k *kubelet) GenerateKubeletConfig(cfg *api.NodeConfig) (*kubeletConfig, er
zap.L().Info("Detected kubelet version", zap.String("version", kubeletVersion))

kubeletConfig := defaultKubeletSubConfig()

if err := kubeletConfig.withFallbackClusterDns(&cfg.Spec.Cluster); err != nil {
return nil, err
}
Expand All @@ -258,6 +291,9 @@ func (k *kubelet) GenerateKubeletConfig(cfg *api.NodeConfig) (*kubeletConfig, er
if err := kubeletConfig.withNodeIp(cfg, k.flags); err != nil {
return nil, err
}
if err := kubeletConfig.withPodInfraContainerImage(cfg, kubeletVersion, k.flags); err != nil {
return nil, err
}

kubeletConfig.withVersionToggles(kubeletVersion, k.flags)
kubeletConfig.withCloudProvider(cfg, k.flags)
Expand Down
9 changes: 9 additions & 0 deletions nodeadm/test/e2e/cases/pod-infra-container/config.yaml
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Original file line number Diff line number Diff line change
@@ -0,0 +1,9 @@
---
apiVersion: node.eks.aws/v1alpha1
kind: NodeConfig
spec:
cluster:
name: my-cluster
apiServerEndpoint: https://example.com
certificateAuthority: Y2VydGlmaWNhdGVBdXRob3JpdHk=
cidr: 10.100.0.0/16
18 changes: 18 additions & 0 deletions nodeadm/test/e2e/cases/pod-infra-container/run.sh
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Original file line number Diff line number Diff line change
@@ -0,0 +1,18 @@
#!/usr/bin/env bash

set -o errexit
set -o nounset
set -o pipefail

source /helpers.sh

mock::imds
wait::dbus-ready

mock::kubelet 1.28.0
nodeadm init --skip run --config-source file://config.yaml
assert::file-contains /etc/eks/kubelet/environment '--pod-infra-container-image=602401143452.dkr.ecr.us-west-2.amazonaws.com/eks/pause:3.5'

mock::kubelet 1.29.0
nodeadm init --skip run --config-source file://config.yaml
assert::file-not-contains /etc/eks/kubelet/environment 'pod-infra-container-image'
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