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Demote static IPs ASAP for easier cleanup

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This exposed bugs in the IP promotion/demotion logic.
This commit is contained in:
Tim Hockin 2016-02-04 10:51:41 -08:00
parent 78322091f0
commit fecb71420c
2 changed files with 101 additions and 33 deletions
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101
pkg/cloudprovider/providers/gce/gce.go
View File

@ -432,7 +432,11 @@ func isHTTPErrorCode(err error, code int) bool {
// new load balancers and updating existing load balancers, recognizing when
// each is needed.
func (gce *GCECloud) EnsureLoadBalancer(name, region string, requestedIP net.IP, ports []*api.ServicePort, hostNames []string, affinityType api.ServiceAffinity) (*api.LoadBalancerStatus, error) {
glog.V(2).Infof("EnsureLoadBalancer(%v, %v, %v, %v, %v)", name, region, requestedIP, ports, hostNames)
portStr := []string{}
for _, p := range ports {
portStr = append(portStr, fmt.Sprintf("%s/%d", p.Protocol, p.Port))
}
glog.V(2).Infof("EnsureLoadBalancer(%v, %v, %v, %v, %v)", name, region, requestedIP, portStr, hostNames)
if len(hostNames) == 0 {
return nil, fmt.Errorf("Cannot EnsureLoadBalancer() with no hosts")
@ -465,53 +469,86 @@ func (gce *GCECloud) EnsureLoadBalancer(name, region string, requestedIP net.IP,
// function in order to maintain the invariant that "if the forwarding rule
// exists, the LB has been fully created".
ipAddress := ""
// Through this process we try to keep track of whether it is safe to
// release the IP that was allocated. If the user specifically asked for
// an IP, we assume they are managing it themselves. Otherwise, we will
// release the IP in case of early-terminating failure or upon successful
// creating of the LB.
releaseStaticIP := false
isUserOwnedIP := false // if this is set, we never release the IP
isSafeToReleaseIP := false
defer func() {
if isUserOwnedIP {
return
}
if isSafeToReleaseIP {
if err := gce.deleteStaticIP(name, region); err != nil {
glog.Errorf("failed to release static IP %s for load balancer (%v, %v): %v", ipAddress, name, region, err)
}
glog.V(2).Infof("EnsureLoadBalancer(%v): released static IP %s", name, ipAddress)
} else {
glog.Warningf("orphaning static IP %s during update of load balancer (%v, %v): %v", ipAddress, name, region, err)
}
}()
if requestedIP != nil {
// If a specific IP address has been requested, we have to respect the
// user's request and use that IP. If the forwarding rule was already using
// a different IP, it will be harmlessly abandoned because it was only an
// ephemeral IP (or it was a different static IP owned by the user, in which
// case we shouldn't delete it anyway).
if err := gce.projectOwnsStaticIP(name, region, requestedIP.String()); err != nil {
return nil, err
if isStatic, err := gce.projectOwnsStaticIP(name, region, requestedIP.String()); err != nil {
return nil, fmt.Errorf("failed to test if this GCE project owns the static IP %s: %v", requestedIP.String(), err)
} else if isStatic {
// The requested IP is a static IP, owned and managed by the user.
isUserOwnedIP = true
isSafeToReleaseIP = false
ipAddress = requestedIP.String()
glog.V(4).Infof("EnsureLoadBalancer(%v): using user-provided static IP %s", name, ipAddress)
} else if requestedIP.String() == fwdRuleIP {
// The requested IP is not a static IP, but is currently assigned
// to this forwarding rule, so we can keep it.
isUserOwnedIP = false
isSafeToReleaseIP = true
ipAddress, _, err = gce.ensureStaticIP(name, region, fwdRuleIP)
if err != nil {
return nil, fmt.Errorf("failed to ensure static IP %s: %v", fwdRuleIP, err)
}
glog.V(4).Infof("EnsureLoadBalancer(%v): using user-provided non-static IP %s", name, ipAddress)
} else {
// The requested IP is not static and it is not assigned to the
// current forwarding rule. It might be attached to a different
// rule or it might not be part of this project at all. Either
// way, we can't use it.
return nil, fmt.Errorf("requested ip %s is neither static nor assigned to LB %s: %v", requestedIP.String(), name, err)
}
ipAddress = requestedIP.String()
} else {
// The user did not request a specific IP.
isUserOwnedIP = false
// This will either allocate a new static IP if the forwarding rule didn't
// already have an IP, or it will promote the forwarding rule's IP from
// ephemeral to static, or it will just get the IP if it is already
// static.
// already have an IP, or it will promote the forwarding rule's current
// IP from ephemeral to static, or it will just get the IP if it is
// already static.
existed := false
ipAddress, existed, err = gce.ensureStaticIP(name, region, fwdRuleIP)
if err != nil {
return nil, err
return nil, fmt.Errorf("failed to ensure static IP %s: %v", fwdRuleIP, err)
}
if existed {
// If the IP was not specifically requested by the user, but it
// already existed, it seems to be a failed update cycle. We can
// use this IP and try to run through the process again, but we
// should not release the IP unless it is explicitly flagged as OK.
releaseStaticIP = false
isSafeToReleaseIP = false
glog.V(4).Infof("EnsureLoadBalancer(%v): adopting static IP %s", name, ipAddress)
} else {
// For total clarity. The IP did not pre-exist and the user did
// not ask for a particular one, so we can release the IP in case
// of failure or success.
releaseStaticIP = true
isSafeToReleaseIP = true
glog.V(4).Infof("EnsureLoadBalancer(%v): allocated static IP %s", name, ipAddress)
}
defer func() {
if releaseStaticIP {
if err := gce.deleteStaticIP(name, region); err != nil {
glog.Errorf("failed to release static IP %s during update of load balancer (%v, %v): %v", ipAddress, name, region, err)
}
} else {
glog.Warningf("orphaning static IP %s during update of load balancer (%v, %v): %v", ipAddress, name, region, err)
}
}()
}
// Deal with the firewall next. The reason we do this here rather than last
@ -530,10 +567,12 @@ func (gce *GCECloud) EnsureLoadBalancer(name, region string, requestedIP net.IP,
if err := gce.updateFirewall(name, region, desc, "0.0.0.0/0", ports, hosts); err != nil {
return nil, err
}
glog.V(4).Infof("EnsureLoadBalancer(%v): updated firewall", name)
} else {
if err := gce.createFirewall(name, region, desc, "0.0.0.0/0", ports, hosts); err != nil {
return nil, err
}
glog.V(4).Infof("EnsureLoadBalancer(%v): created firewall", name)
}
}
@ -553,15 +592,17 @@ func (gce *GCECloud) EnsureLoadBalancer(name, region string, requestedIP net.IP,
// Begin critical section. If we have to delete the forwarding rule,
// and something should fail before we recreate it, don't release the
// IP. That way we can come back to it later.
releaseStaticIP = false
isSafeToReleaseIP = false
if err := gce.deleteForwardingRule(name, region); err != nil {
return nil, fmt.Errorf("failed to delete existing forwarding rule %s for load balancer update: %v", name, err)
}
glog.V(4).Infof("EnsureLoadBalancer(%v): deleted forwarding rule", name)
}
if tpExists && tpNeedsUpdate {
if err := gce.deleteTargetPool(name, region); err != nil {
return nil, fmt.Errorf("failed to delete existing target pool %s for load balancer update: %v", name, err)
}
glog.V(4).Infof("EnsureLoadBalancer(%v): deleted target pool", name)
}
// Once we've deleted the resources (if necessary), build them back up (or for
@ -570,6 +611,7 @@ func (gce *GCECloud) EnsureLoadBalancer(name, region string, requestedIP net.IP,
if err := gce.createTargetPool(name, region, hosts, affinityType); err != nil {
return nil, fmt.Errorf("failed to create target pool %s: %v", name, err)
}
glog.V(4).Infof("EnsureLoadBalancer(%v): created target pool", name)
}
if tpNeedsUpdate || fwdRuleNeedsUpdate {
if err := gce.createForwardingRule(name, region, ipAddress, ports); err != nil {
@ -577,8 +619,10 @@ func (gce *GCECloud) EnsureLoadBalancer(name, region string, requestedIP net.IP,
}
// End critical section. It is safe to release the static IP (which
// just demotes it to ephemeral) now that it is attached. In the case
// of a user-requested IP, the 'defer' won't be installed anyway.
releaseStaticIP = true
// of a user-requested IP, the "is user-owned" flag will be set,
// preventing it from actually being released.
isSafeToReleaseIP = true
glog.V(4).Infof("EnsureLoadBalancer(%v): created forwarding rule, IP %s", name, ipAddress)
}
status := &api.LoadBalancerStatus{}
@ -875,18 +919,18 @@ func (gce *GCECloud) computeHostTags(hosts []*gceInstance) ([]string, error) {
return tags.List(), nil
}
func (gce *GCECloud) projectOwnsStaticIP(name, region string, ipAddress string) error {
func (gce *GCECloud) projectOwnsStaticIP(name, region string, ipAddress string) (bool, error) {
addresses, err := gce.service.Addresses.List(gce.projectID, region).Do()
if err != nil {
return fmt.Errorf("failed to list gce IP addresses: %v", err)
return false, fmt.Errorf("failed to list gce IP addresses: %v", err)
}
for _, addr := range addresses.Items {
if addr.Address == ipAddress {
// This project does own the address, so return success.
return nil
return true, nil
}
}
return fmt.Errorf("this gce project doesn't own the IP address: %s", ipAddress)
return false, nil
}
func (gce *GCECloud) ensureStaticIP(name, region, existingIP string) (ipAddress string, created bool, err error) {
@ -994,6 +1038,7 @@ func (gce *GCECloud) UpdateLoadBalancer(name, region string, hostNames []string)
// EnsureLoadBalancerDeleted is an implementation of LoadBalancer.EnsureLoadBalancerDeleted.
func (gce *GCECloud) EnsureLoadBalancerDeleted(name, region string) error {
glog.V(2).Infof("EnsureLoadBalancerDeleted(%v, %v", name, region)
err := utilerrors.AggregateGoroutines(
func() error { return gce.deleteFirewall(name, region) },
// Even though we don't hold on to static IPs for load balancers, it's
@ -1070,7 +1115,7 @@ func (gce *GCECloud) deleteFirewall(name, region string) error {
func (gce *GCECloud) deleteStaticIP(name, region string) error {
op, err := gce.service.Addresses.Delete(gce.projectID, region, name).Do()
if err != nil && isHTTPErrorCode(err, http.StatusNotFound) {
glog.Infof("Static IP address %s already deleted. Continuing to delete other resources.", name)
glog.Infof("Static IP address %s is not reserved", name)
} else if err != nil {
glog.Warningf("Failed to delete static IP address %s, got error %v", name, err)
return err

33
test/e2e/service.go
View File

@ -486,15 +486,20 @@ var _ = Describe("Services", func() {
// Change the services to LoadBalancer.
requestedIP := ""
staticIPName := ""
if providerIs("gce", "gke") {
By("creating a static load balancer IP")
rand.Seed(time.Now().UTC().UnixNano())
staticIPName := fmt.Sprintf("e2e-external-lb-test-%d", rand.Intn(65535))
staticIPName = fmt.Sprintf("e2e-external-lb-test-%d", rand.Intn(65535))
requestedIP, err = createGCEStaticIP(staticIPName)
Expect(err).NotTo(HaveOccurred())
defer func() {
// Release GCE static IP - this is not kube-managed and will not be automatically released.
deleteGCEStaticIP(staticIPName)
if staticIPName != "" {
// Release GCE static IP - this is not kube-managed and will not be automatically released.
if err := deleteGCEStaticIP(staticIPName); err != nil {
Logf("failed to release static IP %s: %v", staticIPName, err)
}
}
}()
Logf("Allocated static load balancer IP: %s", requestedIP)
}
@ -523,6 +528,23 @@ var _ = Describe("Services", func() {
tcpIngressIP := getIngressPoint(&tcpService.Status.LoadBalancer.Ingress[0])
Logf("TCP load balancer: %s", tcpIngressIP)
By("waiting for the UDP service " + serviceName + " to have a load balancer")
if providerIs("gce", "gke") {
// Do this as early as possible, which overrides the `defer` above.
// This is mostly out of fear of leaking the IP in a timeout case
// (as of this writing we're not 100% sure where the leaks are
// coming from, so this is first-aid rather than surgery).
By("demoting the static IP to ephemeral")
if staticIPName != "" {
// Deleting it after it is attached "demotes" it to an
// ephemeral IP, which can be auto-released.
if err := deleteGCEStaticIP(staticIPName); err != nil {
Failf("failed to release static IP %s: %v", staticIPName, err)
}
staticIPName = ""
}
}
By("waiting for the UDP service to have a load balancer")
// 2nd one should be faster since they ran in parallel.
udpService = jig.WaitForLoadBalancerOrFail(ns2, udpService.Name)
@ -531,7 +553,7 @@ var _ = Describe("Services", func() {
Failf("UDP Spec.Ports[0].NodePort changed (%d -> %d) when not expected", udpNodePort, udpService.Spec.Ports[0].NodePort)
}
udpIngressIP := getIngressPoint(&udpService.Status.LoadBalancer.Ingress[0])
Logf("UDP load balancer: %s", tcpIngressIP)
Logf("UDP load balancer: %s", udpIngressIP)
By("verifying that TCP and UDP use different load balancers")
if tcpIngressIP == udpIngressIP {
@ -614,7 +636,6 @@ var _ = Describe("Services", func() {
if getIngressPoint(&tcpService.Status.LoadBalancer.Ingress[0]) != tcpIngressIP {
Failf("TCP Status.LoadBalancer.Ingress changed (%s -> %s) when not expected", tcpIngressIP, getIngressPoint(&tcpService.Status.LoadBalancer.Ingress[0]))
}
Logf("service port (TCP and UDP): %d", svcPort)
By("changing the UDP service's port")
udpService = jig.UpdateServiceOrFail(ns2, udpService.Name, func(s *api.Service) {
@ -631,6 +652,8 @@ var _ = Describe("Services", func() {
Failf("UDP Status.LoadBalancer.Ingress changed (%s -> %s) when not expected", udpIngressIP, getIngressPoint(&udpService.Status.LoadBalancer.Ingress[0]))
}
Logf("service port (TCP and UDP): %d", svcPort)
By("hitting the TCP service's NodePort")
jig.TestReachableHTTP(nodeIP, tcpNodePort, kubeProxyLagTimeout)