For years, getting deep visibility meant injecting sidecars, patching binaries, or bolting agents onto everything. eBPF flips that: you attach safe programs to the kernel and watch every syscall, packet, and function without touching the app at all.
Why eBPF changes the game
No sidecars, no code changes, instrumentation lives in the kernel
Sees everything: L3-L7 traffic, syscalls, file access, DNS
Near-zero overhead compared to userspace proxies
One source of truth for networking, security, and tracing
Tools like Cilium, Hubble, Pixie, and Parca are all eBPF underneath. Start with Hubble to see service-to-service flows you never had before:
# live map of who is talking to whom, with verdicts
hubble observe --namespace payments --follow
# just the denied flows (great for tightening NetworkPolicy)
hubble observe --verdict DROPPED --last 200Ad-hoc tracing when you need it
When a service is slow and the dashboards are silent, a one-off bpftrace script beats guesswork. Here, count slow file reads by process:
bpftrace -e '
tracepoint:syscalls:sys_exit_read /args->ret > 0/ {
@bytes[comm] = sum(args->ret);
}
interval:s:5 { print(@bytes); clear(@bytes); }'What to actually instrument
Golden signals per service: latency, traffic, errors, saturation
Network policy verdicts, so you can move to default-deny with confidence
Continuous CPU profiling to find the hot path, not guess it
DNS latency and failures, the quiet cause of half your incidents
The best observability is the kind you did not have to ask developers to add.
eBPF turns the kernel into your instrumentation layer. Less agent sprawl, more truth, and a single substrate for observability, security, and networking to share.
