Esempio n. 1
0
// LBInterfaceDown brings the load balancing interface down.
func (ncc *SeesawNCC) LBInterfaceDown(iface *ncctypes.LBInterface, out *int) error {
	netIface, err := iface.Interface()
	if err != nil {
		return err
	}
	log.Infof("Bringing down LB interface %s", netIface.Name)
	return ifaceDown(netIface)
}
Esempio n. 2
0
// LBInterfaceUp brings the load balancing interface up.
func (ncc *SeesawNCC) LBInterfaceUp(iface *ncctypes.LBInterface, out *int) error {
	// TODO(jsing): Handle IPv6-only, and improve IPv6 route setup.
	netIface, err := iface.Interface()
	if err != nil {
		return err
	}
	nodeIface, err := net.InterfaceByName(iface.NodeInterface)
	if err != nil {
		return fmt.Errorf("Failed to get node interface: %v", err)
	}
	nodeNet, err := findNetwork(nodeIface, iface.Node.IPv4Addr)
	if err != nil {
		return fmt.Errorf("Failed to get node network: %v", err)
	}

	log.Infof("Bringing up LB interface %s on %s", nodeNet, iface.Name)

	if !nodeNet.Contains(iface.ClusterVIP.IPv4Addr) {
		return fmt.Errorf("Node network %s does not contain cluster VIP %s", nodeNet, iface.ClusterVIP.IPv4Addr)
	}

	gateway, err := routeDefaultIPv4()
	if err != nil {
		return fmt.Errorf("Failed to get IPv4 default route: %v", err)
	}

	if err := ifaceUp(netIface); err != nil {
		return fmt.Errorf("Failed to bring interface up: %v", err)
	}

	// Configure routing.
	if err := ipRunIface(netIface, "route add %s dev %s table %d", nodeNet, iface.Name, iface.RoutingTableID); err != nil {
		return fmt.Errorf("Failed to configure routing: %v", err)
	}
	if err := ipRunIface(netIface, "route add 0/0 via %s dev %s table %d", gateway, iface.Name, iface.RoutingTableID); err != nil {
		return fmt.Errorf("Failed to configure routing: %v", err)
	}

	return nil
}
Esempio n. 3
0
// LBInterfaceInit initialises the load balancing interface for a Seesaw Node.
func (ncc *SeesawNCC) LBInterfaceInit(iface *ncctypes.LBInterface, out *int) error {
	netIface, err := iface.Interface()
	if err != nil {
		return fmt.Errorf("Failed to get network interface: %v", err)
	}
	nodeIface, err := net.InterfaceByName(iface.NodeInterface)
	if err != nil {
		return fmt.Errorf("Failed to get node interface: %v", err)
	}

	if iface.RoutingTableID < 1 || iface.RoutingTableID > 250 {
		return fmt.Errorf("Invalid routing table ID: %d", iface.RoutingTableID)
	}

	vmac, err := net.ParseMAC(vrrpMAC)
	if err != nil {
		return fmt.Errorf("Failed to parse VRRP MAC %q: %v", vrrpMAC, err)
	}

	// The last byte of the VRRP MAC is determined by the VRID.
	vmac[len(vmac)-1] = iface.VRID
	netIface.HardwareAddr = vmac

	log.Infof("Initialising load balancing interface %s - VRID %d (VMAC %s)", iface.Name, iface.VRID, vmac)

	// Ensure interface is down and set VMAC address.
	if err := ifaceFastDown(netIface); err != nil {
		return fmt.Errorf("Failed to down interface: %v", err)
	}
	if err := ifaceSetMAC(netIface); err != nil {
		return fmt.Errorf("Failed to set MAC: %v", err)
	}

	// Remove VLAN interfaces associated with the load balancing interface.
	if err := ifaceFlushVLANs(netIface); err != nil {
		return fmt.Errorf("Failed to flush VLAN interfaces: %v", err)
	}

	// Configure sysctls for load balancing.
	if err := sysctlInitLB(nodeIface, netIface); err != nil {
		return fmt.Errorf("Failed to initialise sysctls: %v", err)
	}

	// Flush existing IP addresses and add cluster VIPs.
	if err := ifaceFlushIPAddr(netIface); err != nil {
		return fmt.Errorf("Failed to flush IP addresses: %v", err)
	}

	if iface.ClusterVIP.IPv4Addr != nil {
		if err := addClusterVIP(iface, netIface, nodeIface, iface.ClusterVIP.IPv4Addr); err != nil {
			return fmt.Errorf("Failed to add IPv4 cluster VIP: %v", err)
		}
	}
	if iface.ClusterVIP.IPv6Addr != nil {
		if err := addClusterVIP(iface, netIface, nodeIface, iface.ClusterVIP.IPv6Addr); err != nil {
			return fmt.Errorf("Failed to add IPv6 cluster VIP: %v", err)
		}
	}

	// Initialise iptables rules.
	if err := iptablesInit(iface.ClusterVIP); err != nil {
		return err
	}

	// Setup dummy interface.
	dummyIface, err := net.InterfaceByName(iface.DummyInterface)
	if err != nil {
		return fmt.Errorf("Failed to get dummy interface: %v", err)
	}
	if err := ifaceFastDown(dummyIface); err != nil {
		return fmt.Errorf("Failed to down dummy interface: %v", err)
	}
	if err := ifaceFlushIPAddr(dummyIface); err != nil {
		return fmt.Errorf("Failed to flush dummy interface: %v", err)
	}
	if err := ifaceUp(dummyIface); err != nil {
		return fmt.Errorf("Failed to up dummy interface: %v", err)
	}

	return nil
}