119 lines
3.0 KiB
Go
119 lines
3.0 KiB
Go
package system
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import (
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"fmt"
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"log"
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"net"
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"os/exec"
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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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iface := iface
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sysInterfaceMap[iface.Name] = &iface
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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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log.Printf("Taking down interface %q\n", systemInterface.Name)
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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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log.Printf("Probing LKM %q (%q)\n", "8021q", "8021q")
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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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for _, iface := range interfaces {
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if iface.Type() == "bond" {
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args := append([]string{"bonding"}, strings.Split(iface.ModprobeParams(), " ")...)
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log.Printf("Probing LKM %q (%q)\n", "bonding", args)
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return exec.Command("modprobe", args...).Run()
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}
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}
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return nil
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}
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func restartNetworkd() error {
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log.Printf("Restarting networkd.service\n")
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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 := 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 = 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 = 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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log.Printf("Writing networkd unit %q\n", filename)
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_, err := WriteFile(&File{Content: config, Path: filename}, runtimeNetworkPath)
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return err
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}
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