Скачать или смотреть Correlating Network Events and Process Context using eBPF Maps

Understanding the Problem



When a production system starts showing mysterious network errors, traditional tools leave you blind. Running ss -tulpn shows you connections, but by the time you read /proc/net/tcp, the socket’s gone. netstat tells you port 8080 is busy, but which of your twelve microservices is actually holding it? The race condition between observing network state and querying process information means you’re debugging with incomplete data.

eBPF maps solve this by capturing network events and process context atomically in kernel space. When tcp_sendmsg() fires, your eBPF program sees the socket, the sending process, and can correlate them before any race conditions occur. The data lands in a shared map that userspace can query without syscall overhead.