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ebpftracer: report missing BPF tracing program types clearly #367

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Merged
def merged 1 commit into from
Sep 24, 2026
Merged

ebpftracer: report missing BPF tracing program types clearly #367

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1 change: 1 addition & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@
The agent gathers metrics related to a node and the containers running on it, and it exposes them in the Prometheus format.

It uses eBPF to track container related events such as TCP connects, so the minimum supported Linux kernel version is 5.1.
The kernel must also be built with `CONFIG_BPF_EVENTS=y` (kprobe and tracepoint BPF programs); some embedded and vendor kernels disable it.

<img src="https://coroot.com/static/img/blog/ebpf.svg" width="800" />

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6 changes: 6 additions & 0 deletions ebpftracer/tracer.go
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Expand Up @@ -18,6 +18,7 @@ import (
"time"

"github.com/cilium/ebpf"
"github.com/cilium/ebpf/features"
"github.com/cilium/ebpf/link"
"github.com/cilium/ebpf/perf"
"github.com/coroot/coroot-node-agent/common"
Expand Down Expand Up @@ -294,6 +295,11 @@ func (t *Tracer) ebpf(ch chan<- Event) error {
return fmt.Errorf("failed to load collection spec: %w", err)
}
_ = unix.Setrlimit(unix.RLIMIT_MEMLOCK, &unix.Rlimit{Cur: unix.RLIM_INFINITY, Max: unix.RLIM_INFINITY})
for _, pt := range []ebpf.ProgramType{ebpf.TracePoint, ebpf.Kprobe} {
if err := features.HaveProgramType(pt); errors.Is(err, ebpf.ErrNotSupported) {
return fmt.Errorf("kernel does not support BPF %s programs (CONFIG_BPF_EVENTS is not set?): %w", pt, ebpf.ErrNotSupported)
}
}
c, err := ebpf.NewCollectionWithOptions(collectionSpec, ebpf.CollectionOptions{
//Programs: ebpf.ProgramOptions{LogLevel: 2, LogSize: 20 * 1024 * 1024},
})
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