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sd k8s: support sidecar containers in endpoint discovery

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Sidecar containers are a newish feature in k8s. They're implemented
similar to init containers but actually stay running and allow you to
delay startup of your application pod until the sidecar started (like
init containers always do).

This adds the ports of the sidecar container to the list of discovered
endpoint(slice), allowing you to target those containers as well.
The implementation is a copy of that of Pod discovery

fixes: #14927

Signed-off-by: bas smit <bsmit@bol.com>
This commit is contained in:
bas smit 2024-09-18 10:40:18 +02:00 committed by Ayoub Mrini
parent 7a90d73fa6
commit a10dc9298e
2 changed files with 17 additions and 4 deletions
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10
discovery/kubernetes/endpoints.go
View file

@ -361,16 +361,19 @@ func (e *Endpoints) buildEndpoints(eps *apiv1.Endpoints) *targetgroup.Group {
target = target.Merge(podLabels(pod))
// Attach potential container port labels matching the endpoint port.
for _, c := range pod.Spec.Containers {
containers := append(pod.Spec.Containers, pod.Spec.InitContainers...)
for i, c := range containers {
for _, cport := range c.Ports {
if port.Port == cport.ContainerPort {
ports := strconv.FormatUint(uint64(port.Port), 10)
isInit := i >= len(pod.Spec.Containers)
target[podContainerNameLabel] = lv(c.Name)
target[podContainerImageLabel] = lv(c.Image)
target[podContainerPortNameLabel] = lv(cport.Name)
target[podContainerPortNumberLabel] = lv(ports)
target[podContainerPortProtocolLabel] = lv(string(port.Protocol))
target[podContainerIsInit] = lv(strconv.FormatBool(isInit))
break
}
}
@ -411,7 +414,8 @@ func (e *Endpoints) buildEndpoints(eps *apiv1.Endpoints) *targetgroup.Group {
continue
}
for _, c := range pe.pod.Spec.Containers {
containers := append(pe.pod.Spec.Containers, pe.pod.Spec.InitContainers...)
for i, c := range containers {
for _, cport := range c.Ports {
hasSeenPort := func() bool {
for _, eport := range pe.servicePorts {
@ -428,6 +432,7 @@ func (e *Endpoints) buildEndpoints(eps *apiv1.Endpoints) *targetgroup.Group {
a := net.JoinHostPort(pe.pod.Status.PodIP, strconv.FormatUint(uint64(cport.ContainerPort), 10))
ports := strconv.FormatUint(uint64(cport.ContainerPort), 10)
isInit := i >= len(pe.pod.Spec.Containers)
target := model.LabelSet{
model.AddressLabel: lv(a),
podContainerNameLabel: lv(c.Name),
@ -435,6 +440,7 @@ func (e *Endpoints) buildEndpoints(eps *apiv1.Endpoints) *targetgroup.Group {
podContainerPortNameLabel: lv(cport.Name),
podContainerPortNumberLabel: lv(ports),
podContainerPortProtocolLabel: lv(string(cport.Protocol)),
podContainerIsInit: lv(strconv.FormatBool(isInit)),
}
tg.Targets = append(tg.Targets, target.Merge(podLabels(pe.pod)))
}

11
discovery/kubernetes/endpointslice.go
View file

@ -377,19 +377,23 @@ func (e *EndpointSlice) buildEndpointSlice(eps endpointSliceAdaptor) *targetgrou
target = target.Merge(podLabels(pod))
// Attach potential container port labels matching the endpoint port.
for _, c := range pod.Spec.Containers {
containers := append(pod.Spec.Containers, pod.Spec.InitContainers...)
for i, c := range containers {
for _, cport := range c.Ports {
if port.port() == nil {
continue
}
if *port.port() == cport.ContainerPort {
ports := strconv.FormatUint(uint64(*port.port()), 10)
isInit := i >= len(pod.Spec.Containers)
target[podContainerNameLabel] = lv(c.Name)
target[podContainerImageLabel] = lv(c.Image)
target[podContainerPortNameLabel] = lv(cport.Name)
target[podContainerPortNumberLabel] = lv(ports)
target[podContainerPortProtocolLabel] = lv(string(cport.Protocol))
target[podContainerIsInit] = lv(strconv.FormatBool(isInit))
break
}
}
@ -417,7 +421,8 @@ func (e *EndpointSlice) buildEndpointSlice(eps endpointSliceAdaptor) *targetgrou
continue
}
for _, c := range pe.pod.Spec.Containers {
containers := append(pe.pod.Spec.Containers, pe.pod.Spec.InitContainers...)
for i, c := range containers {
for _, cport := range c.Ports {
hasSeenPort := func() bool {
for _, eport := range pe.servicePorts {
@ -437,6 +442,7 @@ func (e *EndpointSlice) buildEndpointSlice(eps endpointSliceAdaptor) *targetgrou
a := net.JoinHostPort(pe.pod.Status.PodIP, strconv.FormatUint(uint64(cport.ContainerPort), 10))
ports := strconv.FormatUint(uint64(cport.ContainerPort), 10)
isInit := i >= len(pe.pod.Spec.Containers)
target := model.LabelSet{
model.AddressLabel: lv(a),
podContainerNameLabel: lv(c.Name),
@ -444,6 +450,7 @@ func (e *EndpointSlice) buildEndpointSlice(eps endpointSliceAdaptor) *targetgrou
podContainerPortNameLabel: lv(cport.Name),
podContainerPortNumberLabel: lv(ports),
podContainerPortProtocolLabel: lv(string(cport.Protocol)),
podContainerIsInit: lv(strconv.FormatBool(isInit)),
}
tg.Targets = append(tg.Targets, target.Merge(podLabels(pe.pod)))
}