docker/cli · error

hostname is empty

Error message

hostname is empty

What it means

Error "hostname is empty" thrown in docker/cli.

Source

Thrown at cli/connhelper/ssh/ssh.go:59

	}
	if u.Scheme == "" {
		return nil, errors.New("no scheme provided")
	}
	if u.Scheme != "ssh" {
		return nil, errors.New("incorrect scheme: " + u.Scheme)
	}

	var sp Spec

	if u.User != nil {
		sp.User = u.User.Username()
		if _, ok := u.User.Password(); ok {
			return nil, errors.New("plain-text password is not supported")
		}
	}
	sp.Host = u.Hostname()
	if sp.Host == "" {
		return nil, errors.New("hostname is empty")
	}
	sp.Port = u.Port()
	sp.Path = u.Path
	if u.RawQuery != "" {
		return nil, fmt.Errorf("query parameters are not allowed: %q", u.RawQuery)
	}
	if u.Fragment != "" {
		return nil, fmt.Errorf("fragments are not allowed: %q", u.Fragment)
	}

	return &sp, nil
}

// Spec of SSH URL
type Spec struct {
	User string
	Host string
	Port string

View on GitHub (pinned to e9452d6e78)

When it happens

Trigger: Thrown at cli/connhelper/ssh/ssh.go:59 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of docker/cli@e9452d6e78 (2026-08-01). Data as JSON: /data/errors/b2bab3ad1f4a9e9e.json. Report an issue: GitHub.