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Support backreferencing of output values from previous rules. Enables complex rule setups where custom features are further combined together to form even more sophisticated higher level labels. The labels created by preceding rules are available as a special 'rule.matched' feature (for matchFeatures to use). If referencing rules accross multiple configs/CRDs care must be taken with the ordering. Processing order of rules in nfd-worker: 1. Static rules 2. Files from /etc/kubernetes/node-feature-discovery/custom.d/ in alphabetical order. Subdirectories are processed by reading their files in alphabetical order. 3. Custom rules from main nfd-worker.conf In nfd-master, NodeFeatureRule objects are processed in alphabetical order (based on their metadata.name). This patch also adds new 'vars' fields to the rule spec. Like 'labels', it is a map of key-value pairs but no labels are generated from these. The values specified in 'vars' are only added for backreferencing into the 'rules.matched' feature. This may by desired in schemes where the output of certain rules is only used as intermediate variables for other rules and no labels out of these are wanted. An example setup: - name: "kernel feature" labels: kernel-feature: matchFeatures: - feature: kernel.version matchExpressions: major: {op: Gt, value: ["4"]} - name: "intermediate var feature" vars: nolabel-feature: "true" matchFeatures: - feature: cpu.cpuid matchExpressions: AVX512F: {op: Exists} - feature: pci.device matchExpressions: vendor: {op: In, value: ["8086"]} device: {op: In, value: ["1234", "1235"]} - name: top-level-feature matchFeatures: - feature: rule.matched matchExpressions: kernel-feature: "true" nolabel-feature: "true" |
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Node Feature Discovery
Node Feature Discovery (NFD) is a Kubernetes add-on for detecting hardware features and system configuration. Detected features are advertised as node labels. NFD provides flexible configuration and extension points for a wide range of vendor and application specific node labeling needs.
See NFD documentation for deployment instructions.