diff options
Diffstat (limited to 'libpod/kube.go')
| -rw-r--r-- | libpod/kube.go | 65 |
1 files changed, 51 insertions, 14 deletions
diff --git a/libpod/kube.go b/libpod/kube.go index 351c49c9a..4e61b5377 100644 --- a/libpod/kube.go +++ b/libpod/kube.go @@ -79,7 +79,11 @@ func (p *Pod) GenerateForKube(ctx context.Context) (*v1.Pod, []v1.ServicePort, e if err != nil { return nil, servicePorts, err } - servicePorts = containerPortsToServicePorts(ports) + spState := newServicePortState() + servicePorts, err = spState.containerPortsToServicePorts(ports) + if err != nil { + return nil, servicePorts, err + } hostNetwork = infraContainer.NetworkMode() == string(namespaces.NetworkMode(specgen.Host)) } pod, err := p.podWithContainers(ctx, allContainers, ports, hostNetwork) @@ -242,13 +246,17 @@ func ConvertV1PodToYAMLPod(pod *v1.Pod) *YAMLPod { } // GenerateKubeServiceFromV1Pod creates a v1 service object from a v1 pod object -func GenerateKubeServiceFromV1Pod(pod *v1.Pod, servicePorts []v1.ServicePort) YAMLService { +func GenerateKubeServiceFromV1Pod(pod *v1.Pod, servicePorts []v1.ServicePort) (YAMLService, error) { service := YAMLService{} selector := make(map[string]string) selector["app"] = pod.Labels["app"] ports := servicePorts if len(ports) == 0 { - ports = containersToServicePorts(pod.Spec.Containers) + p, err := containersToServicePorts(pod.Spec.Containers) + if err != nil { + return service, err + } + ports = p } serviceSpec := v1.ServiceSpec{ Ports: ports, @@ -262,15 +270,43 @@ func GenerateKubeServiceFromV1Pod(pod *v1.Pod, servicePorts []v1.ServicePort) YA APIVersion: pod.TypeMeta.APIVersion, } service.TypeMeta = tm - return service + return service, nil +} + +// servicePortState allows calling containerPortsToServicePorts for a single service +type servicePortState struct { + // A program using the shared math/rand state with the default seed will produce the same sequence of pseudo-random numbers + // for each execution. Use a private RNG state not to interfere with other users. + rng *rand.Rand + usedPorts map[int]struct{} +} + +func newServicePortState() servicePortState { + return servicePortState{ + rng: rand.New(rand.NewSource(time.Now().UnixNano())), + usedPorts: map[int]struct{}{}, + } } // containerPortsToServicePorts takes a slice of containerports and generates a // slice of service ports -func containerPortsToServicePorts(containerPorts []v1.ContainerPort) []v1.ServicePort { +func (state *servicePortState) containerPortsToServicePorts(containerPorts []v1.ContainerPort) ([]v1.ServicePort, error) { sps := make([]v1.ServicePort, 0, len(containerPorts)) for _, cp := range containerPorts { - nodePort := 30000 + rand.Intn(32767-30000+1) + var nodePort int + attempt := 0 + for { + // Legal nodeport range is 30000-32767 + nodePort = 30000 + state.rng.Intn(32767-30000+1) + if _, found := state.usedPorts[nodePort]; !found { + state.usedPorts[nodePort] = struct{}{} + break + } + attempt++ + if attempt >= 100 { + return nil, fmt.Errorf("too many attempts trying to generate a unique NodePort number") + } + } servicePort := v1.ServicePort{ Protocol: cp.Protocol, Port: cp.ContainerPort, @@ -280,21 +316,22 @@ func containerPortsToServicePorts(containerPorts []v1.ContainerPort) []v1.Servic } sps = append(sps, servicePort) } - return sps + return sps, nil } // containersToServicePorts takes a slice of v1.Containers and generates an // inclusive list of serviceports to expose -func containersToServicePorts(containers []v1.Container) []v1.ServicePort { - // Without the call to rand.Seed, a program will produce the same sequence of pseudo-random numbers - // for each execution. Legal nodeport range is 30000-32767 - rand.Seed(time.Now().UnixNano()) - +func containersToServicePorts(containers []v1.Container) ([]v1.ServicePort, error) { + state := newServicePortState() sps := make([]v1.ServicePort, 0, len(containers)) for _, ctr := range containers { - sps = append(sps, containerPortsToServicePorts(ctr.Ports)...) + ports, err := state.containerPortsToServicePorts(ctr.Ports) + if err != nil { + return nil, err + } + sps = append(sps, ports...) } - return sps + return sps, nil } func (p *Pod) podWithContainers(ctx context.Context, containers []*Container, ports []v1.ContainerPort, hostNetwork bool) (*v1.Pod, error) { |