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Add network-plugin-mtu option for MTU selection

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MTU selection is difficult, and if there is a transport such as IPSEC in
use may be impossible.  So we allow specification of the MTU with the
network-plugin-mtu flag, and we pass this down into the network
provider.

Currently implemented by kubenet.
This commit is contained in:
Justin Santa Barbara
2016-08-10 12:09:43 -04:00
parent 2c103af2b6
commit 902ba4e249
25 changed files with 2874 additions and 2759 deletions
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10
pkg/kubelet/network/plugins.go
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@@ -52,7 +52,7 @@ const (
type NetworkPlugin interface {
// Init initializes the plugin. This will be called exactly once
// before any other methods are called.
Init(host Host, hairpinMode componentconfig.HairpinMode, nonMasqueradeCIDR string) error
Init(host Host, hairpinMode componentconfig.HairpinMode, nonMasqueradeCIDR string, mtu int) error
// Called on various events like:
// NET_PLUGIN_EVENT_POD_CIDR_CHANGE
@@ -105,11 +105,11 @@ type Host interface {
}
// InitNetworkPlugin inits the plugin that matches networkPluginName. Plugins must have unique names.
func InitNetworkPlugin(plugins []NetworkPlugin, networkPluginName string, host Host, hairpinMode componentconfig.HairpinMode, nonMasqueradeCIDR string) (NetworkPlugin, error) {
func InitNetworkPlugin(plugins []NetworkPlugin, networkPluginName string, host Host, hairpinMode componentconfig.HairpinMode, nonMasqueradeCIDR string, mtu int) (NetworkPlugin, error) {
if networkPluginName == "" {
// default to the no_op plugin
plug := &NoopNetworkPlugin{}
if err := plug.Init(host, hairpinMode, nonMasqueradeCIDR); err != nil {
if err := plug.Init(host, hairpinMode, nonMasqueradeCIDR, mtu); err != nil {
return nil, err
}
return plug, nil
@@ -134,7 +134,7 @@ func InitNetworkPlugin(plugins []NetworkPlugin, networkPluginName string, host H
chosenPlugin := pluginMap[networkPluginName]
if chosenPlugin != nil {
err := chosenPlugin.Init(host, hairpinMode, nonMasqueradeCIDR)
err := chosenPlugin.Init(host, hairpinMode, nonMasqueradeCIDR, mtu)
if err != nil {
allErrs = append(allErrs, fmt.Errorf("Network plugin %q failed init: %v", networkPluginName, err))
} else {
@@ -156,7 +156,7 @@ type NoopNetworkPlugin struct {
const sysctlBridgeCallIptables = "net/bridge/bridge-nf-call-iptables"
func (plugin *NoopNetworkPlugin) Init(host Host, hairpinMode componentconfig.HairpinMode, nonMasqueradeCIDR string) error {
func (plugin *NoopNetworkPlugin) Init(host Host, hairpinMode componentconfig.HairpinMode, nonMasqueradeCIDR string, mtu int) error {
// Set bridge-nf-call-iptables=1 to maintain compatibility with older
// kubernetes versions to ensure the iptables-based kube proxy functions
// correctly. Other plugins are responsible for setting this correctly