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Use HTTP liveness probe instead of tetra status #2474

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Use HTTP liveness probe instead of tetra status #2474

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032ca05
Define HTTP endpoint for liveness probe
tpapagian May 27, 2024
d9bd92c
[helm] Use http-based liveness probe
tpapagian May 27, 2024
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14 changes: 14 additions & 0 deletions cmd/tetragon/main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,7 @@ import (
"github.com/cilium/tetragon/pkg/fileutils"
"github.com/cilium/tetragon/pkg/filters"
tetragonGrpc "github.com/cilium/tetragon/pkg/grpc"
"github.com/cilium/tetragon/pkg/health"
"github.com/cilium/tetragon/pkg/logger"
"github.com/cilium/tetragon/pkg/metrics"
"github.com/cilium/tetragon/pkg/metrics/metricsconfig"
Expand Down Expand Up @@ -245,6 +246,19 @@ func tetragonExecute() error {
bpf.CheckOrMountDebugFS()
bpf.CheckOrMountCgroup2()

// start liveness probe http endpoint
go func() {
http.HandleFunc("/liveness", func(w http.ResponseWriter, _ *http.Request) {
resp, err := health.GetHealth()
if err == nil && len(resp.HealthStatus) == 1 && resp.HealthStatus[0].Status == tetragon.HealthStatusResult_HEALTH_STATUS_RUNNING {
w.WriteHeader(http.StatusOK)
} else {
w.WriteHeader(http.StatusServiceUnavailable)
}
})
http.ListenAndServe(":6789", nil)
}()

if option.Config.PprofAddr != "" {
go func() {
if err := servePprof(option.Config.PprofAddr); err != nil {
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2 changes: 1 addition & 1 deletion docs/content/en/docs/reference/helm-chart.md
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2 changes: 1 addition & 1 deletion install/kubernetes/tetragon/README.md
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8 changes: 5 additions & 3 deletions install/kubernetes/tetragon/values.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -64,9 +64,11 @@ tetragon:
securityContext:
privileged: true
# -- Overrides the default livenessProbe for the tetragon container.
livenessProbe: {}
# grpc:
# port: 54321
livenessProbe:
timeoutSeconds: 60
httpGet:
path: "/liveness"
port: 6789

# Tetragon puts processes in an LRU cache. The cache is used to find ancestors
# for subsequently exec'ed processes.
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