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AWS: Remove blackhole routes in our managed range

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Blackhole routes otherwise acccumulate unboundedly.  We also are careful
to ensure that we do so only within the managed range, which requires
enlisting the help of the routecontroller.

Fix #47524
This commit is contained in:
Justin Santa Barbara 2017-06-14 22:34:15 -04:00
parent ad43147e77
commit 11f8886f12
4 changed files with 88 additions and 33 deletions
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3
pkg/cloudprovider/cloud.go
View File

@ -150,6 +150,9 @@ type Route struct {
// DestinationCIDR is the CIDR format IP range that this routing rule
// applies to.
DestinationCIDR string
// Blackhole is set to true if this is a blackhole route
// The node controller will delete the route if it is in the managed range.
Blackhole bool
}
// Routes is an abstract, pluggable interface for advanced routing rules.

33
pkg/cloudprovider/providers/aws/aws_routes.go
View File

@ -90,21 +90,34 @@ func (c *Cloud) ListRoutes(clusterName string) ([]*cloudprovider.Route, error) {
}
for _, r := range table.Routes {
instanceID := orEmpty(r.InstanceId)
destinationCIDR := orEmpty(r.DestinationCidrBlock)
if instanceID == "" || destinationCIDR == "" {
destinationCIDR := aws.StringValue(r.DestinationCidrBlock)
if destinationCIDR == "" {
continue
}
instance, found := instances[instanceID]
if !found {
glog.Warningf("unable to find instance ID %s in the list of instances being routed to", instanceID)
route := &cloudprovider.Route{
Name: clusterName + "-" + destinationCIDR,
DestinationCIDR: destinationCIDR,
}
// Capture blackhole routes
if aws.StringValue(r.State) == ec2.RouteStateBlackhole {
route.Blackhole = true
routes = append(routes, route)
continue
}
nodeName := mapInstanceToNodeName(instance)
routeName := clusterName + "-" + destinationCIDR
routes = append(routes, &cloudprovider.Route{Name: routeName, TargetNode: nodeName, DestinationCIDR: destinationCIDR})
// Capture instance routes
instanceID := aws.StringValue(r.InstanceId)
if instanceID != "" {
instance, found := instances[instanceID]
if found {
route.TargetNode = mapInstanceToNodeName(instance)
routes = append(routes, route)
} else {
glog.Warningf("unable to find instance ID %s in the list of instances being routed to", instanceID)
}
}
}
return routes, nil

8
pkg/controller/route/routecontroller.go
View File

@ -118,7 +118,9 @@ func (rc *RouteController) reconcile(nodes []*v1.Node, routes []*cloudprovider.R
// routeMap maps routeTargetNode->route
routeMap := make(map[types.NodeName]*cloudprovider.Route)
for _, route := range routes {
routeMap[route.TargetNode] = route
if route.TargetNode != "" {
routeMap[route.TargetNode] = route
}
}
wg := sync.WaitGroup{}
@ -171,8 +173,8 @@ func (rc *RouteController) reconcile(nodes []*v1.Node, routes []*cloudprovider.R
}
for _, route := range routes {
if rc.isResponsibleForRoute(route) {
// Check if this route applies to a node we know about & has correct CIDR.
if nodeCIDRs[route.TargetNode] != route.DestinationCIDR {
// Check if this route is a blackhole, or applies to a node we know about & has an incorrect CIDR.
if route.Blackhole || (nodeCIDRs[route.TargetNode] != route.DestinationCIDR) {
wg.Add(1)
// Delete the route.
go func(route *cloudprovider.Route, startTime time.Time) {

77
pkg/controller/route/routecontroller_test.go
View File

@ -97,12 +97,12 @@ func TestReconcile(t *testing.T) {
&node2,
},
initialRoutes: []*cloudprovider.Route{
{cluster + "-01", "node-1", "10.120.0.0/24"},
{cluster + "-02", "node-2", "10.120.1.0/24"},
{cluster + "-01", "node-1", "10.120.0.0/24", false},
{cluster + "-02", "node-2", "10.120.1.0/24", false},
},
expectedRoutes: []*cloudprovider.Route{
{cluster + "-01", "node-1", "10.120.0.0/24"},
{cluster + "-02", "node-2", "10.120.1.0/24"},
{cluster + "-01", "node-1", "10.120.0.0/24", false},
{cluster + "-02", "node-2", "10.120.1.0/24", false},
},
expectedNetworkUnavailable: []bool{true, true},
clientset: fake.NewSimpleClientset(&v1.NodeList{Items: []v1.Node{node1, node2}}),
@ -114,11 +114,11 @@ func TestReconcile(t *testing.T) {
&node2,
},
initialRoutes: []*cloudprovider.Route{
{cluster + "-01", "node-1", "10.120.0.0/24"},
{cluster + "-01", "node-1", "10.120.0.0/24", false},
},
expectedRoutes: []*cloudprovider.Route{
{cluster + "-01", "node-1", "10.120.0.0/24"},
{cluster + "-02", "node-2", "10.120.1.0/24"},
{cluster + "-01", "node-1", "10.120.0.0/24", false},
{cluster + "-02", "node-2", "10.120.1.0/24", false},
},
expectedNetworkUnavailable: []bool{true, true},
clientset: fake.NewSimpleClientset(&v1.NodeList{Items: []v1.Node{node1, node2}}),
@ -131,8 +131,8 @@ func TestReconcile(t *testing.T) {
},
initialRoutes: []*cloudprovider.Route{},
expectedRoutes: []*cloudprovider.Route{
{cluster + "-01", "node-1", "10.120.0.0/24"},
{cluster + "-02", "node-2", "10.120.1.0/24"},
{cluster + "-01", "node-1", "10.120.0.0/24", false},
{cluster + "-02", "node-2", "10.120.1.0/24", false},
},
expectedNetworkUnavailable: []bool{true, true},
clientset: fake.NewSimpleClientset(&v1.NodeList{Items: []v1.Node{node1, node2}}),
@ -144,14 +144,14 @@ func TestReconcile(t *testing.T) {
&node2,
},
initialRoutes: []*cloudprovider.Route{
{cluster + "-01", "node-1", "10.120.0.0/24"},
{cluster + "-02", "node-2", "10.120.1.0/24"},
{cluster + "-03", "node-3", "10.120.2.0/24"},
{cluster + "-04", "node-4", "10.120.3.0/24"},
{cluster + "-01", "node-1", "10.120.0.0/24", false},
{cluster + "-02", "node-2", "10.120.1.0/24", false},
{cluster + "-03", "node-3", "10.120.2.0/24", false},
{cluster + "-04", "node-4", "10.120.3.0/24", false},
},
expectedRoutes: []*cloudprovider.Route{
{cluster + "-01", "node-1", "10.120.0.0/24"},
{cluster + "-02", "node-2", "10.120.1.0/24"},
{cluster + "-01", "node-1", "10.120.0.0/24", false},
{cluster + "-02", "node-2", "10.120.1.0/24", false},
},
expectedNetworkUnavailable: []bool{true, true},
clientset: fake.NewSimpleClientset(&v1.NodeList{Items: []v1.Node{node1, node2}}),
@ -163,12 +163,12 @@ func TestReconcile(t *testing.T) {
&node2,
},
initialRoutes: []*cloudprovider.Route{
{cluster + "-01", "node-1", "10.120.0.0/24"},
{cluster + "-03", "node-3", "10.120.2.0/24"},
{cluster + "-01", "node-1", "10.120.0.0/24", false},
{cluster + "-03", "node-3", "10.120.2.0/24", false},
},
expectedRoutes: []*cloudprovider.Route{
{cluster + "-01", "node-1", "10.120.0.0/24"},
{cluster + "-02", "node-2", "10.120.1.0/24"},
{cluster + "-01", "node-1", "10.120.0.0/24", false},
{cluster + "-02", "node-2", "10.120.1.0/24", false},
},
expectedNetworkUnavailable: []bool{true, true},
clientset: fake.NewSimpleClientset(&v1.NodeList{Items: []v1.Node{node1, node2}}),
@ -181,11 +181,48 @@ func TestReconcile(t *testing.T) {
},
initialRoutes: []*cloudprovider.Route{},
expectedRoutes: []*cloudprovider.Route{
{cluster + "-01", "node-1", "10.120.0.0/24"},
{cluster + "-01", "node-1", "10.120.0.0/24", false},
},
expectedNetworkUnavailable: []bool{true, false},
clientset: fake.NewSimpleClientset(&v1.NodeList{Items: []v1.Node{node1, nodeNoCidr}}),
},
// 2 nodes, an extra blackhole route in our range
{
nodes: []*v1.Node{
&node1,
&node2,
},
initialRoutes: []*cloudprovider.Route{
{cluster + "-01", "node-1", "10.120.0.0/24", false},
{cluster + "-02", "node-2", "10.120.1.0/24", false},
{cluster + "-03", "", "10.120.2.0/24", true},
},
expectedRoutes: []*cloudprovider.Route{
{cluster + "-01", "node-1", "10.120.0.0/24", false},
{cluster + "-02", "node-2", "10.120.1.0/24", false},
},
expectedNetworkUnavailable: []bool{true, true},
clientset: fake.NewSimpleClientset(&v1.NodeList{Items: []v1.Node{node1, node2}}),
},
// 2 nodes, an extra blackhole route not in our range
{
nodes: []*v1.Node{
&node1,
&node2,
},
initialRoutes: []*cloudprovider.Route{
{cluster + "-01", "node-1", "10.120.0.0/24", false},
{cluster + "-02", "node-2", "10.120.1.0/24", false},
{cluster + "-03", "", "10.1.2.0/24", true},
},
expectedRoutes: []*cloudprovider.Route{
{cluster + "-01", "node-1", "10.120.0.0/24", false},
{cluster + "-02", "node-2", "10.120.1.0/24", false},
{cluster + "-03", "", "10.1.2.0/24", true},
},
expectedNetworkUnavailable: []bool{true, true},
clientset: fake.NewSimpleClientset(&v1.NodeList{Items: []v1.Node{node1, node2}}),
},
}
for i, testCase := range testCases {
cloud := &fakecloud.FakeCloud{RouteMap: make(map[string]*fakecloud.FakeRoute)}