Method createDefaultNetworkConfig

pkg/netutil/netutil.go:431–464

(bridgeIP string)

}

func (e *CNIEnv) createDefaultNetworkConfig(bridgeIP string) error {
	exist, err := fsExists(e, DefaultNetworkName)
	if err != nil && !os.IsNotExist(err) {
		return err
	}
	if exist {
		return fmt.Errorf("already found existing network config, cannot create new network named %q", DefaultNetworkName)
	}

	bridgeCIDR := DefaultCIDR
	var bridgeGateways []string
	if bridgeIP != "" {
		bIP, bCIDR, err := net.ParseCIDR(bridgeIP)
		if err != nil {
			return fmt.Errorf("invalid bridge ip %s: %w", bridgeIP, err)
		}
		bridgeGateways = []string{bIP.String()}
		bridgeCIDR = bCIDR.String()
	}
	opts := types.NetworkCreateOptions{
		Name:       DefaultNetworkName,
		Driver:     DefaultNetworkName,
		Subnets:    []string{bridgeCIDR},
		Gateway:    bridgeGateways,
		IPAMDriver: "default",
		Labels:     []string{fmt.Sprintf("%s=true", labels.NerdctlDefaultNetwork)},
	}

	_, err = e.CreateNetwork(opts)
	if err != nil && !errdefs.IsAlreadyExists(err) {
		return err
	}
	return nil
}

// generateNetworkConfig creates NetworkConfig.
// generateNetworkConfig does not fill "File" field.