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        "title": "Re-register device plugins after kubelet socket deletion",
        "summary": "Treat device-plugin socket recreation and kubelet re-registration as an explicit restart handoff before accepting resource advertisement.",
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        "potentially_affected": "Kubernetes node device plugins using the documented kubelet registration socket workflow.",
        "dse_recommendation": "Verify that the plugin detects kubelet restart and completes its serving and registration sequence again.",
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        "content_html": "<p><strong>Bottom line:</strong> Include plugin re-registration in a kubelet restart acceptance plan. Keep the plugin’s process state, its socket and the node’s resource advertisement as separate observations.</p>\n<h2>Source fact: documented behavior</h2>\n<p>The <a href=\"https://kubernetes.io/docs/concepts/extend-kubernetes/compute-storage-net/device-plugins/\" target=\"_blank\" rel=\"noopener noreferrer\">Device Plugins</a> documentation is the primary reference.</p>\n<p>A device plugin must start its gRPC service before registering its socket and resource information with the kubelet. On restart, the kubelet removes Unix sockets under <code>/var/lib/kubelet/device-plugins/</code>; plugins are expected to detect the restart and register again. After successful registration, the plugin reports its devices and the kubelet advertises the corresponding resources in node status.</p>\n<h2>What the source does not establish</h2>\n<p>This article covers the documented device-plugin registration handoff. It does not establish vendor-driver recovery, workload continuity, hardware health or a universal plugin API compatibility promise. Keep dynamic-resource allocation, resource sizing and device failure handling under their separate procedures.</p>\n<h2>Applicability questions</h2>\n<ul>\n<li>Which plugin owns each advertised device resource?</li>\n<li>How does that implementation detect a kubelet restart?</li>\n<li>What evidence distinguishes service startup from successful registration?</li>\n<li>Which workloads and node-maintenance restrictions constrain a test?</li>\n</ul>\n<h2>DSE recommendation: make registration a restart checkpoint</h2>\n<p>DSE recommends adding a device-plugin checkpoint to node maintenance rather than assuming that a running plugin process proves resource availability. Identify the plugin implementation, its supported restart procedure and the resource name expected on the node. Have the vendor or platform owner identify the appropriate diagnostics for that version.</p>\n<p>Write the expected sequence before scheduling a test: plugin service available, registration completed, then resource information reconciled with node status. Keep each observation timestamped. If the sequence stalls, preserve the first missing step instead of repeatedly restarting unrelated components.</p>\n<p>Review the supported deployment’s access to the registration directory without editing or deleting files in a shared node as an improvised repair. Assign a clear recovery owner and stop condition. Confirm that the test plan respects any device-backed workload that cannot be interrupted casually.</p>\n<p>Separate registration acceptance from application acceptance. Ask the workload owner what representative disposable device use is needed after advertisement returns. Keep that test bounded to the approved device and application path, and retain an unresolved driver or allocation issue as a separate finding.</p>\n<h2>Verification and evidence</h2>\n<p>Proposed verification: use a designated nonproduction node with the actual supported plugin and a disposable workload. Capture the expected resource name, initial socket and registration observations, and node-reported resources before an approved kubelet restart.</p>\n<p>Observe the plugin’s restart detection and subsequent registration sequence through supported diagnostics. Compare the resulting node resources with the initial inventory, then perform the separately approved harmless allocation exercise. Retain actual timestamps and errors. Do not manufacture a socket file or manually alter resource status to satisfy the checkpoint; an unexplained advertisement gap remains a maintenance acceptance issue.</p>\n<h2>Official references</h2>\n<ul>\n<li><a href=\"https://kubernetes.io/docs/concepts/extend-kubernetes/compute-storage-net/device-plugins/\" target=\"_blank\" rel=\"noopener noreferrer\">Device Plugins</a> — Kubernetes.</li>\n</ul>\n<p>Source review completed October 30, 2026. Recheck the official documentation and deployment-specific applicability before a production change.</p>\n",
        "content_text": "Bottom line: Include plugin re-registration in a kubelet restart acceptance plan. Keep the plugin’s process state, its socket and the node’s resource advertisement as separate observations.\nSource fact: documented behavior\nThe Device Plugins documentation is the primary reference.\nA device plugin must start its gRPC service before registering its socket and resource information with the kubelet. On restart, the kubelet removes Unix sockets under /var/lib/kubelet/device-plugins/; plugins are expected to detect the restart and register again. After successful registration, the plugin reports its devices and the kubelet advertises the corresponding resources in node status.\nWhat the source does not establish\nThis article covers the documented device-plugin registration handoff. It does not establish vendor-driver recovery, workload continuity, hardware health or a universal plugin API compatibility promise. Keep dynamic-resource allocation, resource sizing and device failure handling under their separate procedures.\nApplicability questions\n\nWhich plugin owns each advertised device resource?\nHow does that implementation detect a kubelet restart?\nWhat evidence distinguishes service startup from successful registration?\nWhich workloads and node-maintenance restrictions constrain a test?\n\nDSE recommendation: make registration a restart checkpoint\nDSE recommends adding a device-plugin checkpoint to node maintenance rather than assuming that a running plugin process proves resource availability. Identify the plugin implementation, its supported restart procedure and the resource name expected on the node. Have the vendor or platform owner identify the appropriate diagnostics for that version.\nWrite the expected sequence before scheduling a test: plugin service available, registration completed, then resource information reconciled with node status. Keep each observation timestamped. If the sequence stalls, preserve the first missing step instead of repeatedly restarting unrelated components.\nReview the supported deployment’s access to the registration directory without editing or deleting files in a shared node as an improvised repair. Assign a clear recovery owner and stop condition. Confirm that the test plan respects any device-backed workload that cannot be interrupted casually.\nSeparate registration acceptance from application acceptance. Ask the workload owner what representative disposable device use is needed after advertisement returns. Keep that test bounded to the approved device and application path, and retain an unresolved driver or allocation issue as a separate finding.\nVerification and evidence\nProposed verification: use a designated nonproduction node with the actual supported plugin and a disposable workload. Capture the expected resource name, initial socket and registration observations, and node-reported resources before an approved kubelet restart.\nObserve the plugin’s restart detection and subsequent registration sequence through supported diagnostics. Compare the resulting node resources with the initial inventory, then perform the separately approved harmless allocation exercise. Retain actual timestamps and errors. Do not manufacture a socket file or manually alter resource status to satisfy the checkpoint; an unexplained advertisement gap remains a maintenance acceptance issue.\nOfficial references\n\nDevice Plugins — Kubernetes.\n\nSource review completed October 30, 2026. Recheck the official documentation and deployment-specific applicability before a production change.",
        "content_markdown": "Bottom line: Include plugin re-registration in a kubelet restart acceptance plan. Keep the plugin’s process state, its socket and the node’s resource advertisement as separate observations.\n\n## Source fact: documented behavior\n\nThe [Device Plugins](https://kubernetes.io/docs/concepts/extend-kubernetes/compute-storage-net/device-plugins/) documentation is the primary reference.\n\nA device plugin must start its gRPC service before registering its socket and resource information with the kubelet. On restart, the kubelet removes Unix sockets under /var/lib/kubelet/device-plugins/; plugins are expected to detect the restart and register again. After successful registration, the plugin reports its devices and the kubelet advertises the corresponding resources in node status.\n\n## What the source does not establish\n\nThis article covers the documented device-plugin registration handoff. It does not establish vendor-driver recovery, workload continuity, hardware health or a universal plugin API compatibility promise. Keep dynamic-resource allocation, resource sizing and device failure handling under their separate procedures.\n\n## Applicability questions\n\n- Which plugin owns each advertised device resource?\n\n- How does that implementation detect a kubelet restart?\n\n- What evidence distinguishes service startup from successful registration?\n\n- Which workloads and node-maintenance restrictions constrain a test?\n\n## DSE recommendation: make registration a restart checkpoint\n\nDSE recommends adding a device-plugin checkpoint to node maintenance rather than assuming that a running plugin process proves resource availability. Identify the plugin implementation, its supported restart procedure and the resource name expected on the node. Have the vendor or platform owner identify the appropriate diagnostics for that version.\n\nWrite the expected sequence before scheduling a test: plugin service available, registration completed, then resource information reconciled with node status. Keep each observation timestamped. If the sequence stalls, preserve the first missing step instead of repeatedly restarting unrelated components.\n\nReview the supported deployment’s access to the registration directory without editing or deleting files in a shared node as an improvised repair. Assign a clear recovery owner and stop condition. Confirm that the test plan respects any device-backed workload that cannot be interrupted casually.\n\nSeparate registration acceptance from application acceptance. Ask the workload owner what representative disposable device use is needed after advertisement returns. Keep that test bounded to the approved device and application path, and retain an unresolved driver or allocation issue as a separate finding.\n\n## Verification and evidence\n\nProposed verification: use a designated nonproduction node with the actual supported plugin and a disposable workload. Capture the expected resource name, initial socket and registration observations, and node-reported resources before an approved kubelet restart.\n\nObserve the plugin’s restart detection and subsequent registration sequence through supported diagnostics. Compare the resulting node resources with the initial inventory, then perform the separately approved harmless allocation exercise. Retain actual timestamps and errors. Do not manufacture a socket file or manually alter resource status to satisfy the checkpoint; an unexplained advertisement gap remains a maintenance acceptance issue.\n\n## Official references\n\n- [Device Plugins](https://kubernetes.io/docs/concepts/extend-kubernetes/compute-storage-net/device-plugins/) — Kubernetes.\n\nSource review completed October 30, 2026. Recheck the official documentation and deployment-specific applicability before a production change."
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                "articleBody": "Bottom line: Include plugin re-registration in a kubelet restart acceptance plan. Keep the plugin’s process state, its socket and the node’s resource advertisement as separate observations.\nSource fact: documented behavior\nThe Device Plugins documentation is the primary reference.\nA device plugin must start its gRPC service before registering its socket and resource information with the kubelet. On restart, the kubelet removes Unix sockets under /var/lib/kubelet/device-plugins/; plugins are expected to detect the restart and register again. After successful registration, the plugin reports its devices and the kubelet advertises the corresponding resources in node status.\nWhat the source does not establish\nThis article covers the documented device-plugin registration handoff. It does not establish vendor-driver recovery, workload continuity, hardware health or a universal plugin API compatibility promise. Keep dynamic-resource allocation, resource sizing and device failure handling under their separate procedures.\nApplicability questions\n\nWhich plugin owns each advertised device resource?\nHow does that implementation detect a kubelet restart?\nWhat evidence distinguishes service startup from successful registration?\nWhich workloads and node-maintenance restrictions constrain a test?\n\nDSE recommendation: make registration a restart checkpoint\nDSE recommends adding a device-plugin checkpoint to node maintenance rather than assuming that a running plugin process proves resource availability. Identify the plugin implementation, its supported restart procedure and the resource name expected on the node. Have the vendor or platform owner identify the appropriate diagnostics for that version.\nWrite the expected sequence before scheduling a test: plugin service available, registration completed, then resource information reconciled with node status. Keep each observation timestamped. If the sequence stalls, preserve the first missing step instead of repeatedly restarting unrelated components.\nReview the supported deployment’s access to the registration directory without editing or deleting files in a shared node as an improvised repair. Assign a clear recovery owner and stop condition. Confirm that the test plan respects any device-backed workload that cannot be interrupted casually.\nSeparate registration acceptance from application acceptance. Ask the workload owner what representative disposable device use is needed after advertisement returns. Keep that test bounded to the approved device and application path, and retain an unresolved driver or allocation issue as a separate finding.\nVerification and evidence\nProposed verification: use a designated nonproduction node with the actual supported plugin and a disposable workload. Capture the expected resource name, initial socket and registration observations, and node-reported resources before an approved kubelet restart.\nObserve the plugin’s restart detection and subsequent registration sequence through supported diagnostics. Compare the resulting node resources with the initial inventory, then perform the separately approved harmless allocation exercise. Retain actual timestamps and errors. Do not manufacture a socket file or manually alter resource status to satisfy the checkpoint; an unexplained advertisement gap remains a maintenance acceptance issue.\nOfficial references\n\nDevice Plugins — Kubernetes.\n\nSource review completed October 30, 2026. Recheck the official documentation and deployment-specific applicability before a production change.",
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