Senior LevelLinux Commands & SysAdmin
How does bpftool inspect loaded eBPF programs, maps, and link attachments?
❓ Interview Prompt: Explain bpftool utility, inspecting eBPF program types, probing maps (bpftool map dump), and inspecting kernel tracepoint attachments.
'bpftool' is the official Linux kernel utility for inspecting and managing active eBPF programs, maps, and link attachments:
Commands:
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'bpftool prog list': Lists all eBPF programs currently loaded in kernel memory.
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'bpftool map dump id <ID>': Dumps key-value contents of an active eBPF map.
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'bpftool net list': Displays eBPF programs attached to network interfaces (XDP, TC).
Code Implementation Example
bash
# List all eBPF programs loaded in kernel memory
sudo bpftool prog list
# Dump contents of active eBPF map ID 42
sudo bpftool map dump id 42
# Inspect eBPF network attachments
sudo bpftool net list💡Inspecting active eBPF programs and map contents using bpftool.
🎯 Interview Key Takeaway
Use bpftool to inspect, debug, and monitor active eBPF kernel programs and data maps.
#bpftool#eBPF#Kernel Observability#Senior
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