eBPF Probes Cheat Sheet: Cloud-Native Debugging [2026]

As cloud-native architectures grow in complexity, traditional logging and tracing often fall short due to excessive overhead and limited visibility into the kernel-user space boundary. eBPF (Extended Berkeley Packet Filter) has emerged as the industry-standard solution for 2026, providing a programmable way to hook into nearly any event in the Linux kernel. This cheat sheet serves as a definitive reference for the essential probes required to debug, profile, and secure modern distributed systems.

The Reference Matrix

Choosing the right probe depends on your stability requirements and whether you are targeting the kernel or an application. Use this comparison to decide which mechanism fits your current debugging session.

Kernel Probes (kprobes)

kprobes allow you to dynamically break into any kernel routine. They are invaluable for tracing internal kernel states that are not exposed via standard APIs or tracepoints.

• kprobe: Instruments the entry point of a function. Use this to inspect arguments.
• kretprobe: Instruments the return point of a function. Use this to inspect return values and latency.

# Trace every time a file is opened in the kernel
bpftrace -e 'kprobe:do_sys_open { printf("%s opened a file\n", comm); }'

User-space Probes (uprobes)

uprobes bring eBPF power to your applications. They allow you to trace function calls inside your own binaries (Go, Rust, C++) or shared libraries (libc, openssl) without modifying the source code.

# Trace SSL/TLS handshake latency in OpenSSL
bpftrace -e 'uprobe:/lib/x86_64-linux-gnu/libssl.so.3:SSL_read { @start[tid] = nsecs; } 
            uretprobe:/lib/x86_64-linux-gnu/libssl.so.3:SSL_read /@start[tid]/ { 
              @latency = avg(nsecs - @start[tid]); delete(@start[tid]); 
            }'

Static Tracepoints

Unlike kprobes, tracepoints are explicitly placed in the kernel source code by maintainers. They represent a stable contract and are less likely to change between kernel releases.

• Find available tracepoints: bpftrace -l "tracepoint:*"
• Highly recommended for: syscalls, scheduler events, and network stack monitoring.

# Summarize disk I/O size by process
bpftrace -e 'tracepoint:block:block_rq_issue { @[comm] = sum(args->bytes); }'

One-Liner Cheat Sheet

These bpftrace commands are essential for your SRE toolkit when troubleshooting production incidents in 2026.

Advanced Configuration & 2026 Limits

When deploying eBPF in massive Kubernetes clusters, configuration is key to avoiding "BPF fatigue." Ensure your environment meets these 2026 standards:

• BTF (BPF Type Format): Ensure CONFIG_DEBUG_INFO_BTF=y is set in your kernel to avoid needing heavy kernel headers.
• Resource Limits: Use cgroups v2 to limit the memory usage of your eBPF maps to prevent OOM kills on your monitoring agent.
• Privacy: When extracting stack traces that might contain sensitive environment variables or user data, remember to run outputs through our Data Masking Tool to maintain compliance before sharing debug logs across teams.