cloudflare/cloudflared · warning

ErrInsuficientFields

ErrInsuficientFields

Error message

insufficient fields

What it means

ErrInsuficientFields is a sentinel error in diagnostic/error.go thrown when parsing the fields of collector output. Parsers split each output line into whitespace-separated fields and require a minimum count (diskFieldsMinimum for disk volume lines, osInformationFieldsMinimum for OS information). When a line has fewer fields than required, the parser wraps this error with fmt.Errorf including expected vs. actual counts. Note the intentional (historical) single-'f' spelling of the identifier.

Source

Thrown at diagnostic/error.go:15

package diagnostic

import (
	"errors"
)

var (
	// Error used when there is no log directory available.
	ErrManagedLogNotFound = errors.New("managed log directory not found")
	// Error used when it is not possible to collect logs using the log configuration.
	ErrLogConfigurationIsInvalid = errors.New("provided log configuration is invalid")
	// Error used when parsing the fields of the output of collector.
	ErrInsufficientLines = errors.New("insufficient lines")
	// Error used when parsing the lines of the output of collector.
	ErrInsuficientFields = errors.New("insufficient fields")
	// Error used when given key is not found while parsing KV.
	ErrKeyNotFound = errors.New("key not found")
	// Error used when there is no disk volume information available.
	ErrNoVolumeFound = errors.New("no disk volume information found")
	// Error user when the base url of the diagnostic client is not provided.
	ErrNoBaseURL = errors.New("no base url")
	// Error used when no metrics server is found listening to the known addresses list (check [metrics.GetMetricsKnownAddresses]).
	ErrMetricsServerNotFound = errors.New("metrics server not found")
	// Error used when multiple metrics server are found listening to the known addresses list (check [metrics.GetMetricsKnownAddresses]).
	ErrMultipleMetricsServerFound = errors.New("multiple metrics server found")
	// Error used when a temporary file creation fails within the diagnostic procedure
	ErrCreatingTemporaryFile = errors.New("temporary file creation failed")
)

View on GitHub (pinned to 2253eeeb25)

Solutions

1. Target the collection at an environment with standard tooling: use --diag-container-id / --diag-pod-id so the collector runs where field counts match expectations.
2. Check the target environment's tool output (e.g. run the underlying disk/uname commands manually) and, in containers, install full-featured (non-busybox) tools.
3. Force a standard locale (LC_ALL=C) for the diagnostics environment if localized output changes column counts.
4. Upgrade cloudflared if your platform's tool version emits a different column layout than the parser expects.

Example fix

// before: busybox df prints fewer columns; parser errors
FROM alpine
RUN apk add busybox

// after: full toolchain for diagnostics parsing
FROM alpine
RUN apk add --no-cache coreutils util-linux
RUN apk add cloudflared

// Go: validate field count before handing the line to the parser
fields := strings.Fields(line)
if len(fields) < diskFieldsMinimum {
    // skip malformed line instead of calling the parser
}

func hasMinFields(line string, min int) bool {
    return len(strings.Fields(line)) >= min
}

vols, err := diagnostic.ParseDiskVolumeInformationOutput(out, useUchar)
if errors.Is(err, diagnostic.ErrInsuficientFields) {
    log.Warn().Msg("unexpected column layout from system tools; skipping")
    return nil
}

When it happens

Trigger: ParseDiskVolumeInformationOutput when a disk-volume line splits into fewer than diskFieldsMinimum fields (diagnostic/system_collector_utils.go:88); ParseUnameOutput when OS information has fewer than osInformationFieldsMinimum fields (system_collector_utils.go:143); the same sentinel is also returned by ParseSysctlFileDescriptorInformation when its output lacks required fields.

Common situations: Collecting diagnostics inside containers whose busybox-style tools print fewer columns than GNU tools; containers mounting /proc or /sys with limited visible fields; remote diagnostics against hosts with different tool versions; translated/localized tool output altering column layout.

Related errors

• ErrInsufficientLines
• ErrKeyNotFound
• ErrManagedLogNotFound
• ErrLogConfigurationIsInvalid
• ErrEmptyDomain

AI-assisted analysis of cloudflare/cloudflared@2253eeeb25 (2026-09-06). Data as JSON: /api/errors/aecbe7011df36d72. Report an issue: GitHub.