120 lines
2.9 KiB
Go
120 lines
2.9 KiB
Go
package system
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import (
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"fmt"
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"io/ioutil"
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"net"
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"os"
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"os/exec"
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"path"
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"strings"
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"time"
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"github.com/coreos/coreos-cloudinit/network"
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"github.com/coreos/coreos-cloudinit/third_party/github.com/dotcloud/docker/pkg/netlink"
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)
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const (
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runtimeNetworkPath = "/run/systemd/network"
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)
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func RestartNetwork(interfaces []network.InterfaceGenerator) (err error) {
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defer func() {
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if e := restartNetworkd(); e != nil {
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err = e
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return
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}
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// TODO(crawford): Get rid of this once networkd fixes the race
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// https://bugs.freedesktop.org/show_bug.cgi?id=76077
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time.Sleep(5 * time.Second)
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if e := restartNetworkd(); e != nil {
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err = e
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}
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}()
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if err = downNetworkInterfaces(interfaces); err != nil {
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return
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}
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if err = maybeProbe8012q(interfaces); err != nil {
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return
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}
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return maybeProbeBonding(interfaces)
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}
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func downNetworkInterfaces(interfaces []network.InterfaceGenerator) error {
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sysInterfaceMap := make(map[string]*net.Interface)
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if systemInterfaces, err := net.Interfaces(); err == nil {
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for _, iface := range systemInterfaces {
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// Need a copy of the interface so we can take the address
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temp := iface
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sysInterfaceMap[temp.Name] = &temp
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}
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} else {
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return err
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}
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for _, iface := range interfaces {
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if systemInterface, ok := sysInterfaceMap[iface.Name()]; ok {
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if err := netlink.NetworkLinkDown(systemInterface); err != nil {
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fmt.Printf("Error while downing interface %q (%s). Continuing...\n", systemInterface.Name, err)
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}
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}
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}
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return nil
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}
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func maybeProbe8012q(interfaces []network.InterfaceGenerator) error {
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for _, iface := range interfaces {
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if iface.Type() == "vlan" {
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return exec.Command("modprobe", "8021q").Run()
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}
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}
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return nil
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}
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func maybeProbeBonding(interfaces []network.InterfaceGenerator) error {
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args := []string{"bonding"}
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for _, iface := range interfaces {
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if iface.Type() == "bond" {
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args = append(args, strings.Split(iface.ModprobeParams(), " ")...)
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break
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}
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}
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return exec.Command("modprobe", args...).Run()
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}
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func restartNetworkd() error {
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_, err := NewUnitManager("").RunUnitCommand("restart", "systemd-networkd.service")
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return err
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}
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func WriteNetworkdConfigs(interfaces []network.InterfaceGenerator) error {
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for _, iface := range interfaces {
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filename := path.Join(runtimeNetworkPath, fmt.Sprintf("%s.netdev", iface.Filename()))
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if err := writeConfig(filename, iface.Netdev()); err != nil {
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return err
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}
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filename = path.Join(runtimeNetworkPath, fmt.Sprintf("%s.link", iface.Filename()))
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if err := writeConfig(filename, iface.Link()); err != nil {
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return err
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}
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filename = path.Join(runtimeNetworkPath, fmt.Sprintf("%s.network", iface.Filename()))
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if err := writeConfig(filename, iface.Network()); err != nil {
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return err
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}
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}
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return nil
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}
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func writeConfig(filename string, config string) error {
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if config == "" {
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return nil
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}
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if err := os.MkdirAll(path.Dir(filename), 0755); err != nil {
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return err
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}
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return ioutil.WriteFile(filename, []byte(config), 0444)
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}
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