The LFS258 report describes a failed HTTPS connection while kubeadm was retrieving the kube-apiserver:v1.29.1 image manifest—not evidence that the image tag was missing. The post does not identify what reset the connection or document a confirmed fix. Diagnose registry access, image-repository configuration, and the separate pause-image warning independently.
What happened in the LFS258 report?
On 18 July 2024, a learner following Lab 3.1 of the LFS258 course PDF ran kubeadm init --config=kubeadm-config.yaml --upload-certs | tee kubeadm-init.out on an Ubuntu 20.04.6 LTS virtual machine in an office lab. Kubeadm reported Kubernetes v1.29.1 and failed during the preflight image-pulling phase.
For registry.k8s.io/kube-apiserver:v1.29.1, the runtime’s HTTP HEAD request for the manifest ended with read: connection reset by peer. The log showed an asia-south1-docker.pkg.dev backing endpoint. Similar connection-reset messages appeared for kube-controller-manager. A reset establishes that the exchange failed; it does not establish whether a firewall, proxy, route, TLS inspection, or another condition caused it.
The post also listed kube-scheduler:v1.29.1, kube-proxy:v1.29.1, coredns/coredns:v1.11.1, pause:3.9, and etcd:3.5.12-0 among the requested images. Those names and tags are incident details for that v1.29.1 setup, not a recommendation for other Kubernetes versions.
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How to diagnose the image-pull failure
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List the images for the same kubeadm configuration
From the environment where you will run initialization, use
kubeadm config images list --config=kubeadm-config.yaml. The configuration matters: it determines the Kubernetes version and can specify the image repository. Compare the resulting names and tags with the images your environment is expected to retrieve. -
Try a deliberate pre-pull and keep the full error
Run
kubeadm config images pull --config=kubeadm-config.yamlto have kubeadm pull the images selected by that configuration before initialization. Record the time, full runtime error, requested reference, and any endpoint or HTTP/TLS details. A generic “ImagePull” label is not enough to distinguish a connection failure from a missing name or tag.Kubernetes Documentation says: “For running kubeadm without an Internet connection you have to pre-pull the required control plane images.” Pre-pulling is useful for an offline setup only if the required images are already available to the runtime on the target machine or through an approved reachable source.
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Inspect runtime logs and the network path
Check the container runtime’s logs around the failure time and preserve the complete error. For the reported reset, ask the network administrator to check the VM’s DNS resolution and outbound TCP/443 path, proxy requirements, firewall policy, and any TLS inspection. These are diagnostic checks prompted by the failure shape and office-lab setting; the forum post confirms none of them as the cause.
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Use a mirror only when the environment requires one
Kubeadm uses
registry.k8s.ioby default, and its configuration supports an alternateimageRepository. If policy requires a mirror, set the repository in the kubeadm configuration, then use that same configuration to list and pull images. Verify that the mirror actually contains the image paths kubeadm expects: paths in a custom repository may differ from the defaults. Stage images under the expected paths rather than substituting tags or paths ad hoc. -
Retry initialization after correcting the identified condition
Once the registry route, proxy, or mirror is working and the required references are available to the runtime, rerun the intended
kubeadm initcommand with the same configuration. If it fails again, use the new full error and timestamp to continue diagnosis; the original post does not establish a successful workaround.
Keep the pause-image warning separate
The learner also reported that the runtime sandbox image was registry.k8s.io/pause:3.8, while kubeadm recommended registry.k8s.io/pause:3.9. This is a distinct runtime configuration warning. Align the runtime’s sandbox image with the pause image expected by the Kubernetes version where appropriate, but do not treat that change as a demonstrated fix for the manifest-request reset. The report does not show that the mismatch caused the connection failure.
Choose the next action based on the error
| What you observe | What it points to | Next action |
|---|---|---|
| Manifest request ends in “connection reset by peer” | The network exchange was interrupted; the message alone does not identify why. | Inspect runtime logs and have the network administrator check the VM’s registry path, proxy, firewall, DNS, and TLS inspection. |
| The configured image reference or tag cannot be found | Check the selected Kubernetes version, repository, and image path rather than assuming a network reset. | List images using the same kubeadm configuration and compare the reference with what the registry or mirror provides. |
| Direct registry access is blocked by policy | The environment may require an approved proxy or mirror. | Configure the approved repository deliberately, confirm its paths, and pre-pull with the same kubeadm configuration. |
| Runtime sandbox image differs from kubeadm’s recommendation | A separate runtime configuration mismatch is reported. | Review and align the runtime sandbox-image setting as appropriate; do not infer that this resolves a registry connection reset. |
What the report does—and does not—establish
The report is a July 2024 account of a particular v1.29.1 installation attempt. It shows a reset during manifest retrieval and a separate pause-image mismatch. It does not establish the root cause, a successful repair, or the current health of registry.k8s.io. Treat the error as a prompt to isolate network access, image naming, and runtime configuration rather than as proof of a Kubernetes image defect.
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