/
subnets.go
301 lines (264 loc) · 8.8 KB
/
subnets.go
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package plugin
import (
"fmt"
"net"
"strings"
"time"
log "github.com/golang/glog"
kapi "k8s.io/kubernetes/pkg/api"
kapiunversioned "k8s.io/kubernetes/pkg/api/unversioned"
kclient "k8s.io/kubernetes/pkg/client/unversioned"
"k8s.io/kubernetes/pkg/types"
utilruntime "k8s.io/kubernetes/pkg/util/runtime"
utilwait "k8s.io/kubernetes/pkg/util/wait"
"k8s.io/kubernetes/pkg/watch"
osapi "github.com/openshift/origin/pkg/sdn/api"
"github.com/openshift/origin/pkg/util/netutils"
)
func (master *OsdnMaster) SubnetStartMaster(clusterNetwork *net.IPNet, hostSubnetLength uint32) error {
subrange := make([]string, 0)
subnets, err := master.registry.GetSubnets()
if err != nil {
log.Errorf("Error in initializing/fetching subnets: %v", err)
return err
}
for _, sub := range subnets {
subrange = append(subrange, sub.Subnet)
if err = master.registry.ValidateNodeIP(sub.HostIP); err != nil {
// Don't error out; just warn so the error can be corrected with 'oc'
log.Errorf("Failed to validate HostSubnet %s: %v", hostSubnetToString(&sub), err)
} else {
log.Infof("Found existing HostSubnet %s", hostSubnetToString(&sub))
}
}
master.subnetAllocator, err = netutils.NewSubnetAllocator(clusterNetwork.String(), hostSubnetLength, subrange)
if err != nil {
return err
}
go utilwait.Forever(master.watchNodes, 0)
return nil
}
func (master *OsdnMaster) addNode(nodeName string, nodeIP string) error {
// Validate node IP before proceeding
if err := master.registry.ValidateNodeIP(nodeIP); err != nil {
return err
}
// Check if subnet needs to be created or updated
sub, err := master.registry.GetSubnet(nodeName)
if err == nil {
if sub.HostIP == nodeIP {
return nil
} else {
// Node IP changed, update old subnet
sub.HostIP = nodeIP
sub, err = master.registry.UpdateSubnet(sub)
if err != nil {
return fmt.Errorf("Error updating subnet %s for node %s: %v", sub.Subnet, nodeName, err)
}
log.Infof("Updated HostSubnet %s", hostSubnetToString(sub))
return nil
}
}
// Create new subnet
sn, err := master.subnetAllocator.GetNetwork()
if err != nil {
return fmt.Errorf("Error allocating network for node %s: %v", nodeName, err)
}
sub, err = master.registry.CreateSubnet(nodeName, nodeIP, sn.String())
if err != nil {
master.subnetAllocator.ReleaseNetwork(sn)
return fmt.Errorf("Error creating subnet %s for node %s: %v", sn.String(), nodeName, err)
}
log.Infof("Created HostSubnet %s", hostSubnetToString(sub))
return nil
}
func (master *OsdnMaster) deleteNode(nodeName string) error {
sub, err := master.registry.GetSubnet(nodeName)
if err != nil {
return fmt.Errorf("Error fetching subnet for node %q for deletion: %v", nodeName, err)
}
_, ipnet, err := net.ParseCIDR(sub.Subnet)
if err != nil {
return fmt.Errorf("Error parsing subnet %q for node %q for deletion: %v", sub.Subnet, nodeName, err)
}
master.subnetAllocator.ReleaseNetwork(ipnet)
err = master.registry.DeleteSubnet(nodeName)
if err != nil {
return fmt.Errorf("Error deleting subnet %v for node %q: %v", sub, nodeName, err)
}
log.Infof("Deleted HostSubnet %s", hostSubnetToString(sub))
return nil
}
func getNodeIP(node *kapi.Node) (string, error) {
if len(node.Status.Addresses) > 0 && node.Status.Addresses[0].Address != "" {
return node.Status.Addresses[0].Address, nil
} else {
return netutils.GetNodeIP(node.Name)
}
}
// Because openshift-sdn uses an overlay and doesn't need GCE Routes, we need to
// clear the NetworkUnavailable condition that kubelet adds to initial node
// status when using GCE.
// TODO: make upstream kubelet more flexible with overlays and GCE so this
// condition doesn't get added for network plugins that don't want it, and then
// we can remove this function.
func (master *OsdnMaster) clearInitialNodeNetworkUnavailableCondition(node *kapi.Node) {
knode := node
cleared := false
resultErr := kclient.RetryOnConflict(kclient.DefaultBackoff, func() error {
var err error
if knode != node {
knode, err = master.registry.kClient.Nodes().Get(node.ObjectMeta.Name)
if err != nil {
return err
}
}
// Let caller modify knode's status, then push to api server.
_, condition := kapi.GetNodeCondition(&node.Status, kapi.NodeNetworkUnavailable)
if condition != nil && condition.Status != kapi.ConditionFalse && condition.Reason == "NoRouteCreated" {
condition.Status = kapi.ConditionFalse
condition.Reason = "RouteCreated"
condition.Message = "openshift-sdn cleared kubelet-set NoRouteCreated"
condition.LastTransitionTime = kapiunversioned.Now()
knode, err = master.registry.kClient.Nodes().UpdateStatus(knode)
if err == nil {
cleared = true
}
}
return err
})
if resultErr != nil {
utilruntime.HandleError(fmt.Errorf("Status update failed for local node: %v", resultErr))
} else if cleared {
log.Infof("Cleared node NetworkUnavailable/NoRouteCreated condition for %s", node.ObjectMeta.Name)
}
}
func (master *OsdnMaster) watchNodes() {
eventQueue := master.registry.RunEventQueue(Nodes)
nodeAddressMap := map[types.UID]string{}
for {
eventType, obj, err := eventQueue.Pop()
if err != nil {
utilruntime.HandleError(fmt.Errorf("EventQueue failed for nodes: %v", err))
return
}
node := obj.(*kapi.Node)
name := node.ObjectMeta.Name
uid := node.ObjectMeta.UID
nodeIP, err := getNodeIP(node)
if err != nil {
log.Errorf("Failed to get node IP for %s, skipping event: %v, node: %v", name, eventType, node)
continue
}
switch eventType {
case watch.Added, watch.Modified:
master.clearInitialNodeNetworkUnavailableCondition(node)
if oldNodeIP, ok := nodeAddressMap[uid]; ok && (oldNodeIP == nodeIP) {
continue
}
// Node status is frequently updated by kubelet, so log only if the above condition is not met
log.V(5).Infof("Watch %s event for Node %q", strings.Title(string(eventType)), name)
err = master.addNode(name, nodeIP)
if err != nil {
log.Errorf("Error creating subnet for node %s, ip %s: %v", name, nodeIP, err)
continue
}
nodeAddressMap[uid] = nodeIP
case watch.Deleted:
log.V(5).Infof("Watch %s event for Node %q", strings.Title(string(eventType)), name)
delete(nodeAddressMap, uid)
err = master.deleteNode(name)
if err != nil {
log.Errorf("Error deleting node %s: %v", name, err)
}
}
}
}
func (node *OsdnNode) SubnetStartNode(mtu uint32) (bool, error) {
err := node.initSelfSubnet()
if err != nil {
return false, err
}
// Assume we are working with IPv4
ni, err := node.registry.GetNetworkInfo()
if err != nil {
return false, err
}
networkChanged, err := node.SetupSDN(node.localSubnet.Subnet, ni.ClusterNetwork.String(), ni.ServiceNetwork.String(), mtu)
if err != nil {
return false, err
}
go utilwait.Forever(node.watchSubnets, 0)
return networkChanged, nil
}
func (node *OsdnNode) initSelfSubnet() error {
// timeout: 30 secs
retries := 60
retryInterval := 500 * time.Millisecond
var err error
var subnet *osapi.HostSubnet
// Try every retryInterval and bail-out if it exceeds max retries
for i := 0; i < retries; i++ {
// Get subnet for current node
subnet, err = node.registry.GetSubnet(node.hostName)
if err == nil {
break
}
log.Warningf("Could not find an allocated subnet for node: %s, Waiting...", node.hostName)
time.Sleep(retryInterval)
}
if err != nil {
return fmt.Errorf("Failed to get subnet for this host: %s, error: %v", node.hostName, err)
}
if err = node.registry.ValidateNodeIP(subnet.HostIP); err != nil {
return fmt.Errorf("Failed to validate own HostSubnet: %v", err)
}
log.Infof("Found local HostSubnet %s", hostSubnetToString(subnet))
node.localSubnet = subnet
return nil
}
// Only run on the nodes
func (node *OsdnNode) watchSubnets() {
subnets := make(map[string]*osapi.HostSubnet)
eventQueue := node.registry.RunEventQueue(HostSubnets)
for {
eventType, obj, err := eventQueue.Pop()
if err != nil {
utilruntime.HandleError(fmt.Errorf("EventQueue failed for subnets: %v", err))
return
}
hs := obj.(*osapi.HostSubnet)
if hs.HostIP == node.localIP {
continue
}
log.V(5).Infof("Watch %s event for HostSubnet %q", strings.Title(string(eventType)), hs.ObjectMeta.Name)
switch eventType {
case watch.Added, watch.Modified:
oldSubnet, exists := subnets[string(hs.UID)]
if exists {
if oldSubnet.HostIP == hs.HostIP {
continue
} else {
// Delete old subnet rules
if err = node.DeleteHostSubnetRules(oldSubnet); err != nil {
log.Error(err)
}
}
}
if err = node.registry.ValidateNodeIP(hs.HostIP); err != nil {
log.Errorf("Ignoring invalid subnet for node %s: %v", hs.HostIP, err)
continue
}
if err = node.AddHostSubnetRules(hs); err != nil {
log.Error(err)
continue
}
subnets[string(hs.UID)] = hs
case watch.Deleted:
delete(subnets, string(hs.UID))
if err = node.DeleteHostSubnetRules(hs); err != nil {
log.Error(err)
}
}
}
}