{"record":{"id":"af88a0370e297942","repo":"kubernetes/kops","slug":"error-loading-channel-q-v-af88a0","errorCode":null,"errorMessage":"error loading channel %q: %v","messagePattern":"error loading channel %q: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"cmd/kops/toolbox_template.go","lineNumber":170,"sourceCode":"\tsnippets := make(map[string]string)\n\tfor _, x := range options.snippetsPath {\n\t\tlist, err := expandFiles(utils.ExpandPath(x))\n\t\tif err != nil {\n\t\t\treturn fmt.Errorf(\"unable to expand the snippets: %s, error: %s\", x, err)\n\t\t}\n\n\t\tfor _, j := range list {\n\t\t\tcontent, err := os.ReadFile(j)\n\t\t\tif err != nil {\n\t\t\t\treturn fmt.Errorf(\"unable to read snippet: %s, error: %s\", j, err)\n\t\t\t}\n\t\t\tsnippets[path.Base(j)] = string(content)\n\t\t}\n\t}\n\n\tchannel, err := kopsapi.LoadChannel(f.VFSContext(), options.channel)\n\tif err != nil {\n\t\treturn fmt.Errorf(\"error loading channel %q: %v\", options.channel, err)\n\t}\n\n\t// @step: render each of the templates, splitting on the documents\n\tr := templater.NewTemplater(channel)\n\tvar documents []string\n\tfor _, x := range templates {\n\t\tcontent, err := os.ReadFile(x)\n\t\tif err != nil {\n\t\t\treturn fmt.Errorf(\"unable to read template: %s, error: %s\", x, err)\n\t\t}\n\n\t\trendered, err := r.Render(string(content), context, snippets, options.failOnMissing)\n\t\tif err != nil {\n\t\t\treturn fmt.Errorf(\"unable to render template: %s, error: %s\", x, err)\n\t\t}\n\t\t// @check if the content is zero ignore it\n\t\tif len(rendered) <= 0 {\n\t\t\tcontinue","sourceCodeStart":152,"sourceCodeEnd":188,"githubUrl":"https://github.com/kubernetes/kops/blob/4c8573c808a73d578c5eadc86d410646ea0b0d73/cmd/kops/toolbox_template.go#L152-L188","documentation":"Returned by RunToolBoxTemplate when kopsapi.LoadChannel fails to load the Kubernetes channel spec referenced by --channel. The channel (default: the kOps stable channel URL) provides Kubernetes version recommendations and defaults used by the templater; load failures include network errors fetching a remote channel, 404s, invalid channel content, or unresolvable local paths.","triggerScenarios":"`kops toolbox template --channel <path-or-url>` where the URL is wrong/unreachable, the local file doesn't exist or isn't valid YAML channel format, DNS/proxy issues block the remote fetch, or an offline environment tries to load a remote channel without a cached copy.","commonSituations":"Using a custom channel file with a wrong path; air-gapped/corporate-proxy environments where the default https://channel no longer resolves; pointing at a raw YAML file that isn't a valid channel spec; kOps/channel version mismatch making the content unparsable.","solutions":["Check the --channel value: for remote channels verify network/DNS/proxy access (curl the URL); for local channels verify the file exists and is a valid channel YAML","Test connectivity: curl -I <channel-url> from the same host to confirm reachability","Use one of the canonical kOps channels (e.g. the stable channel URL matching your kOps version) instead of a hand-made file","In offline environments, mirror the channel file locally and pass its path via --channel","Validate a custom channel against the kOps ChannelSpec schema; a malformed file fails to load"],"exampleFix":"// before\nkops toolbox template --channel ./mychanel.yaml --template-path ./templates\n\n// after\nkops toolbox template --channel ./mychannel.yaml --template-path ./templates","handlingStrategy":"try-catch","validationCode":"channelRef := options.channel\nif u, err := url.Parse(channelRef); err == nil && u.Scheme == \"https\" {\n    resp, err := http.Head(channelRef)\n    if err != nil || resp.StatusCode != 200 {\n        return fmt.Errorf(\"channel %q not reachable\", channelRef)\n    }\n} else if _, err := os.Stat(channelRef); err != nil {\n    return fmt.Errorf(\"local channel file %q missing\", channelRef)\n}","typeGuard":null,"tryCatchPattern":"if err := runToolboxTemplate(); err != nil {\n    if strings.Contains(err.Error(), \"error loading channel\") {\n        if isNetworkErr(err) { return retryWithBackoff(runToolboxTemplate) }\n        return fmt.Errorf(\"check --channel value and network/proxy access: %w\", err)\n    }\n    return err\n}","preventionTips":["Mirror the channel file locally for air-gapped or proxied environments","Validate custom channel files against the kOps ChannelSpec schema before use","Pin the channel URL to a version compatible with your kOps release","Verify DNS/proxy settings on hosts that fetch remote channels"],"tags":["kops","channel","network","cli"],"backgroundTag":"channel-load-failed","analyzedSha":"4c8573c808a73d578c5eadc86d410646ea0b0d73","analyzedAt":"2026-09-05T04:13:19.212Z","contentChangedAt":"2026-09-05T04:13:19.212Z","schemaVersion":2},"datasetVersion":"2026-09-12T07:17:12.445Z"}