juanfont/headscale · error

writing TLS certificate to container: %w

Error message

writing TLS certificate to container: %w

What it means

Error "writing TLS certificate to container: %w" thrown in juanfont/headscale.

Source

Thrown at integration/tsic/tsic.go:604

	}

	if err != nil {
		return nil, fmt.Errorf(
			"%s could not start tailscale container (version: %s): %w",
			hostname,
			version,
			err,
		)
	}

	log.Printf("Created %s container\n", hostname)

	tsic.container = container

	for i, cert := range tsic.caCerts {
		err = tsic.WriteFile(fmt.Sprintf("%s/user-%d.crt", caCertRoot, i), cert)
		if err != nil {
			return nil, fmt.Errorf("writing TLS certificate to container: %w", err)
		}
	}

	return tsic, nil
}

// Shutdown stops and cleans up the Tailscale container.
func (t *TailscaleInContainer) Shutdown() (string, string, error) {
	stdoutPath, stderrPath, err := t.SaveLog("/tmp/control")
	if err != nil {
		log.Printf(
			"saving log from %s: %s",
			t.hostname,
			fmt.Errorf("saving log: %w", err),
		)
	}

	return stdoutPath, stderrPath, t.pool.Purge(t.container)

View on GitHub (pinned to 565fd254d0)

Solutions

1. Inspect the wrapped error for the underlying cause and correct the failing condition (writing TLS certificate to container); retry the operation after fixing the input, configuration, or environment.

Example fix

Inspect the wrapped error for the underlying cause and correct the failing condition (writing TLS certificate to container); retry the operation after fixing the input, configuration, or environment.

When it happens

Trigger: Thrown at integration/tsic/tsic.go:604 when the library encounters an invalid state.

Common situations: Writing the TLS certificate into the tailscale container failed. Ensure the container is running and the certificate files were generated.

Understand the failure class

• SSL/TLS and certificate errors — how TLS handshakes and certificate validation fail.

AI-assisted analysis of juanfont/headscale@565fd254d0 (2026-08-15). Data as JSON: /api/errors/7cae857c5c2c6b3e. Report an issue: GitHub.