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ipam-node: add periodic cleanup loop for stale reservations
Signed-off-by: Yury Kulazhenkov <ykulazhenkov@nvidia.com>
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Original file line number | Diff line number | Diff line change |
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/* | ||
Copyright 2023, NVIDIA CORPORATION & AFFILIATES | ||
Licensed under the Apache License, Version 2.0 (the "License"); | ||
you may not use this file except in compliance with the License. | ||
You may obtain a copy of the License at | ||
http://www.apache.org/licenses/LICENSE-2.0 | ||
Unless required by applicable law or agreed to in writing, software | ||
distributed under the License is distributed on an "AS IS" BASIS, | ||
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
See the License for the specific language governing permissions and | ||
limitations under the License. | ||
*/ | ||
|
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package cleaner | ||
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import ( | ||
"context" | ||
"fmt" | ||
"strings" | ||
"time" | ||
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"github.com/go-logr/logr" | ||
"github.com/google/uuid" | ||
corev1 "k8s.io/api/core/v1" | ||
apiErrors "k8s.io/apimachinery/pkg/api/errors" | ||
apiTypes "k8s.io/apimachinery/pkg/types" | ||
"sigs.k8s.io/controller-runtime/pkg/client" | ||
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storePkg "github.com/Mellanox/nvidia-k8s-ipam/pkg/ipam-node/store" | ||
"github.com/Mellanox/nvidia-k8s-ipam/pkg/ipam-node/types" | ||
) | ||
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type Cleaner interface { | ||
Start(ctx context.Context) | ||
} | ||
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func New(client client.Client, storeMgr storePkg.Manager, | ||
checkInterval time.Duration, | ||
checkCountBeforeRelease int) Cleaner { | ||
return &cleaner{ | ||
client: client, | ||
storeMgr: storeMgr, | ||
checkInterval: checkInterval, | ||
checkCountBeforeRelease: checkCountBeforeRelease, | ||
staleAllocations: make(map[string]int), | ||
} | ||
} | ||
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type cleaner struct { | ||
client client.Client | ||
storeMgr storePkg.Manager | ||
checkInterval time.Duration | ||
checkCountBeforeRelease int | ||
// key is <pool_name>|<container_id>|<interface_name>, value is count of failed checks | ||
staleAllocations map[string]int | ||
} | ||
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func (c *cleaner) Start(ctx context.Context) { | ||
logger := logr.FromContextOrDiscard(ctx).WithName("cleaner") | ||
for { | ||
loopLogger := logger.WithValues("checkID", uuid.NewString()) | ||
loopLogger.Info("check for stale IPs") | ||
ctx = logr.NewContext(ctx, loopLogger) | ||
if err := c.loop(ctx); err != nil { | ||
loopLogger.Error(err, "check failed") | ||
} | ||
select { | ||
case <-ctx.Done(): | ||
logger.Info("shutdown cleaner") | ||
return | ||
case <-time.After(c.checkInterval): | ||
} | ||
} | ||
} | ||
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func (c *cleaner) loop(ctx context.Context) error { | ||
logger := logr.FromContextOrDiscard(ctx) | ||
store, err := c.storeMgr.Open(ctx) | ||
if err != nil { | ||
return fmt.Errorf("failed to open store: %v", err) | ||
} | ||
allReservations := map[string]struct{}{} | ||
for _, poolName := range store.ListPools() { | ||
for _, reservation := range store.ListReservations(poolName) { | ||
resLogger := logger.WithValues("pool", poolName, | ||
"container_id", reservation.ContainerID, "interface_name", reservation.InterfaceName) | ||
key := c.getStaleAllocKey(poolName, reservation) | ||
allReservations[key] = struct{}{} | ||
if reservation.Metadata.PodName == "" || reservation.Metadata.PodNamespace == "" { | ||
resLogger.V(2).Info("reservation has no required metadata fields, skip") | ||
continue | ||
} | ||
pod := &corev1.Pod{} | ||
err := c.client.Get(ctx, apiTypes.NamespacedName{ | ||
Namespace: reservation.Metadata.PodNamespace, | ||
Name: reservation.Metadata.PodName, | ||
}, pod) | ||
if err != nil && !apiErrors.IsNotFound(err) { | ||
store.Cancel() | ||
return fmt.Errorf("failed to read Pod info from the cache: %v", err) | ||
} | ||
if apiErrors.IsNotFound(err) || | ||
(reservation.Metadata.PodUUID != "" && reservation.Metadata.PodUUID != string(pod.UID)) { | ||
c.staleAllocations[key]++ | ||
resLogger.V(2).Info("pod not found in the API, increase stale counter", | ||
"value", c.staleAllocations[key]) | ||
} else { | ||
delete(c.staleAllocations, key) | ||
} | ||
} | ||
} | ||
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for k, count := range c.staleAllocations { | ||
// remove unknown reservations from c.staleAllocations | ||
if _, isKnownReservation := allReservations[k]; !isKnownReservation { | ||
delete(c.staleAllocations, k) | ||
continue | ||
} | ||
// release reservations which were marked as stale multiple times | ||
if count > c.checkCountBeforeRelease { | ||
keyFields := strings.SplitN(k, "|", 3) | ||
pool, containerID, ifName := keyFields[0], keyFields[1], keyFields[2] | ||
logger.Info("stale reservation released", "pool", pool, | ||
"container_id", containerID, "interface_name", ifName) | ||
store.ReleaseReservationByID(pool, containerID, ifName) | ||
} | ||
} | ||
if err := store.Commit(); err != nil { | ||
return fmt.Errorf("failed to commit changes to the store: %v", err) | ||
} | ||
return nil | ||
} | ||
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func (c *cleaner) getStaleAllocKey(poolName string, r types.Reservation) string { | ||
return fmt.Sprintf("%s|%s|%s", poolName, r.ContainerID, r.InterfaceName) | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,66 @@ | ||
/* | ||
Copyright 2023, NVIDIA CORPORATION & AFFILIATES | ||
Licensed under the Apache License, Version 2.0 (the "License"); | ||
you may not use this file except in compliance with the License. | ||
You may obtain a copy of the License at | ||
http://www.apache.org/licenses/LICENSE-2.0 | ||
Unless required by applicable law or agreed to in writing, software | ||
distributed under the License is distributed on an "AS IS" BASIS, | ||
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
See the License for the specific language governing permissions and | ||
limitations under the License. | ||
*/ | ||
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package cleaner_test | ||
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import ( | ||
"context" | ||
"testing" | ||
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"github.com/go-logr/logr" | ||
. "github.com/onsi/ginkgo/v2" | ||
. "github.com/onsi/gomega" | ||
"k8s.io/klog/v2" | ||
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"k8s.io/client-go/rest" | ||
"sigs.k8s.io/controller-runtime/pkg/client" | ||
"sigs.k8s.io/controller-runtime/pkg/envtest" | ||
) | ||
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var ( | ||
cfg *rest.Config | ||
k8sClient client.Client | ||
testEnv *envtest.Environment | ||
cFunc context.CancelFunc | ||
ctx context.Context | ||
) | ||
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func TestCleaner(t *testing.T) { | ||
RegisterFailHandler(Fail) | ||
RunSpecs(t, "Cleaner Suite") | ||
} | ||
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var _ = BeforeSuite(func() { | ||
By("bootstrapping test environment") | ||
testEnv = &envtest.Environment{} | ||
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ctx, cFunc = context.WithCancel(context.Background()) | ||
ctx = logr.NewContext(ctx, klog.NewKlogr()) | ||
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var err error | ||
// cfg is defined in this file globally. | ||
cfg, err = testEnv.Start() | ||
Expect(err).NotTo(HaveOccurred()) | ||
Expect(cfg).NotTo(BeNil()) | ||
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k8sClient, err = client.New(cfg, client.Options{}) | ||
Expect(err).NotTo(HaveOccurred()) | ||
Expect(k8sClient).NotTo(BeNil()) | ||
}) | ||
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var _ = AfterSuite(func() { | ||
cFunc() | ||
By("tearing down the test environment") | ||
err := testEnv.Stop() | ||
Expect(err).NotTo(HaveOccurred()) | ||
}) |
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