{"record":{"id":"5e73ce98065f55f4","repo":"derailed/k9s","slug":"context-activation-failed-for-s","errorCode":null,"errorMessage":"context activation failed for: %s","messagePattern":"context activation failed for: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"internal/config/k9s.go","lineNumber":298,"sourceCode":"\t\t\t\tslog.Debug(\"Setting proxy address\", slogs.Address, cfg.Context.Proxy.Address)\n\t\t\t\treturn url.Parse(cfg.Context.Proxy.Address)\n\t\t\t})\n\n\t\t\tif !k.conn.CheckConnectivity() {\n\t\t\t\treturn nil, fmt.Errorf(\"unable to connect to context %q\", contextName)\n\t\t\t}\n\t\t}\n\t}\n\n\tk.Validate(k.conn, contextName, ct.Cluster)\n\t// If the context specifies a namespace, use it!\n\tif ns := ct.Namespace; ns != client.BlankNamespace {\n\t\tk.getActiveConfig().Context.Namespace.Active = ns\n\t} else if k.getActiveConfig().Context.Namespace.Active == \"\" {\n\t\tk.getActiveConfig().Context.Namespace.Active = client.DefaultNamespace\n\t}\n\tif k.getActiveConfig().Context == nil {\n\t\treturn nil, fmt.Errorf(\"context activation failed for: %s\", contextName)\n\t}\n\n\treturn k.getActiveConfig().Context, nil\n}\n\n// Reload reloads the context config from disk.\nfunc (k *K9s) Reload() error {\n\t// Switching context skipping reload...\n\tif k.getContextSwitch() {\n\t\treturn nil\n\t}\n\tctxName := k.getActiveContextName()\n\tif ctxName == \"\" {\n\t\treturn errors.New(\"no active context available\")\n\t}\n\tct, err := k.ks.GetContext(ctxName)\n\tif err != nil {\n\t\treturn err","sourceCodeStart":280,"sourceCodeEnd":316,"githubUrl":"https://github.com/derailed/k9s/blob/2d3ccc6ba2ce98c3781bfc441bb3e884f072774f/internal/config/k9s.go#L280-L316","documentation":"Returned at the tail of K9s.ActivateContext (internal/config/k9s.go:298): after the context config is loaded and namespace defaults applied, the active config's Context pointer is still nil. This is a defensive invariant check that is nearly unreachable — if Context were nil with a non-blank context namespace, the dereference a few lines earlier would have panicked first; it can only fire when the kubeconfig context has no namespace AND no active namespace was set, leaving cfg.Context nil (e.g. an effectively empty per-context yaml).","triggerScenarios":"A per-context config file that unmarshals to a data.Config with a nil Context (empty or context-less yaml) combined with a kubeconfig context that sets no namespace and no previously active namespace. Realistically rare; mostly a canary for config-dir corruption or an unexpected dir.Load result.","commonSituations":"Empty per-context yaml created by a crashed first run; manual deletion of file contents while keeping the file; edge-case downgrades where the loader shape changed.","solutions":["Inspect the per-context file under $K9S_CONFIG_DIR/contexts/<cluster>/<ctx>.yaml — ensure it has a top-level 'context:' section","Delete the suspect file so k9s regenerates a complete default on next activation","Recreate with valid minimal content: context:\\n  namespace:\\n    active: default","If it reproduces with a well-formed file, capture the config and report it as a k9s bug (invariant breach)"],"exampleFix":"# before: contexts/prod-c/prod.yaml is empty or lacks 'context:'\n{} \n\n# after\ncontext:\n  namespace:\n    active: default\n    favorites:\n      default: []","handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":"if _, err := k9s.ActivateContext(name); err != nil {\n\tif strings.Contains(err.Error(), \"context activation failed for\") {\n\t\t// invariant breach: per-context config has no 'context:' section.\n\t\t// Delete the context yaml so defaults regenerate, then retry once.\n\t\t_ = os.Remove(filepath.Join(k9sConfigDir, \"clusters\", cluster, name+\".yaml\"))\n\t\t_, err = k9s.ActivateContext(name)\n\t}\n}","preventionTips":["Never leave per-context yaml files empty — either delete them or keep a valid 'context:' section","If this fires with well-formed configs, preserve the files and report a k9s bug (defensive check breached)","Track k9s config dir in git to detect exactly when a file became degenerate"],"tags":["k9s","context","invariant","config","internal"],"backgroundTag":null,"analyzedSha":"2d3ccc6ba2ce98c3781bfc441bb3e884f072774f","analyzedAt":"2026-08-15T16:09:14.432Z","schemaVersion":2},"datasetVersion":"2026-08-15T17:31:12.345Z"}