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fix(promtail): Fix API level node filtering of Kubernetes SD to only fetch pod metadata for pods of the current node #14267

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Merged
merged 3 commits into from
Jan 10, 2025
Merged

fix(promtail): Fix API level node filtering of Kubernetes SD to only fetch pod metadata for pods of the current node #14267

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8a218cb
fix: Correct loop in kube pod selector
LashaJini Sep 26, 2024
6295cc9
Merge branch 'main' into correctly-loop-over-k8s-selectors
chaudum Dec 13, 2024
7df0600
Merge branch 'main' into correctly-loop-over-k8s-selectors
chaudum Dec 13, 2024
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12 changes: 6 additions & 6 deletions clients/pkg/promtail/targets/file/filetargetmanager.go
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Original file line number Diff line number Diff line change
Expand Up @@ -264,13 +264,13 @@ func (tm *FileTargetManager) fulfillKubePodSelector(selectors []kubernetes.Selec
return []kubernetes.SelectorConfig{{Role: kubernetes.RolePod, Field: nodeSelector}}
}

for _, selector := range selectors {
if selector.Field == "" {
selector.Field = nodeSelector
} else if !strings.Contains(selector.Field, nodeSelector) {
selector.Field += "," + nodeSelector
for i := range selectors {
if selectors[i].Field == "" {
selectors[i].Field = nodeSelector
} else if !strings.Contains(selectors[i].Field, nodeSelector) {
selectors[i].Field += "," + nodeSelector
}
selector.Role = kubernetes.RolePod
selectors[i].Role = kubernetes.RolePod
}

return selectors
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68 changes: 68 additions & 0 deletions clients/pkg/promtail/targets/file/filetargetmanager_test.go
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Expand Up @@ -14,6 +14,7 @@ import (
"github.com/go-kit/log"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/discovery"
"github.com/prometheus/prometheus/discovery/kubernetes"
"github.com/prometheus/prometheus/discovery/targetgroup"

"github.com/grafana/loki/v3/clients/pkg/promtail/api"
Expand Down Expand Up @@ -594,3 +595,70 @@ func TestLabelSetUpdate(t *testing.T) {
require.Equal(t, 0, len(syncer.fileEventWatchers))

}

func TestFulfillKubePodSelector(t *testing.T) {
w := log.NewSyncWriter(os.Stderr)
logger := log.NewLogfmtLogger(w)
logDirName := newTestLogDirectories(t)

positionsFileName := filepath.Join(logDirName, "positions.yml")
ps, err := newTestPositions(logger, positionsFileName)
if err != nil {
t.Fatal(err)
}

client := fake.New(func() {})
defer client.Stop()

ftm, err := newTestFileTargetManager(logger, client, ps, logDirName+"/*")
assert.NoError(t, err)
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Contributor Author

@LashaJini LashaJini Sep 26, 2024 •
edited
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add the missing err assertion to satisfy the linter

host := "test-host"

// empty selectors
selectors := []kubernetes.SelectorConfig{}
expected := []kubernetes.SelectorConfig{
{Role: kubernetes.RolePod, Field: fmt.Sprintf("%s=%s", kubernetesPodNodeField, host)},
}

result := ftm.fulfillKubePodSelector(selectors, host)
require.Equal(t, expected, result)

// non-empty selectors with empty field
selectors = []kubernetes.SelectorConfig{
{Role: kubernetes.RolePod, Field: ""},
}
expected = []kubernetes.SelectorConfig{
{Role: kubernetes.RolePod, Field: fmt.Sprintf("%s=%s", kubernetesPodNodeField, host)},
}

result = ftm.fulfillKubePodSelector(selectors, host)
require.Equal(t, expected, result)

// non-empty selectors with existing field without nodeSelector
selectors = []kubernetes.SelectorConfig{
{Role: kubernetes.RolePod, Field: "app=frontend"},
}
expectedField := "app=frontend," + fmt.Sprintf("%s=%s", kubernetesPodNodeField, host)
expected = []kubernetes.SelectorConfig{
{Role: kubernetes.RolePod, Field: expectedField},
}

result = ftm.fulfillKubePodSelector(selectors, host)
require.Equal(t, expected, result)

// non-empty selectors with existing Field containing nodeSelector
nodeSelector := fmt.Sprintf("%s=%s", kubernetesPodNodeField, host)
selectors = []kubernetes.SelectorConfig{
{Role: kubernetes.RolePod, Field: nodeSelector},
}
expected = []kubernetes.SelectorConfig{
{Role: kubernetes.RolePod, Field: nodeSelector},
}

result = ftm.fulfillKubePodSelector(selectors, host)
require.Equal(t, expected, result)

ftm.Stop()
ps.Stop()
}
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