← из прошлого урока
You worked the network from the outside: routing, NAT, firewall. Now we turn the lens inward, to the process itself. Next come /proc, lsof, strace: three tools for "what is happening in your hands right now."
Средний
15 мин · урок входит в курс «Средний»
When a service does not respond to signals or eats memory, ps
and top do not show what exactly process-and-pid is doing
right now. For that there is /proc/<pid>/* (a virtual FS with
everything the kernel knows about a process), lsof (what the process
has open), and strace (which syscalls it makes in real time).
strace needs the SYS_PTRACE capability, and it is already enabled
in this sandbox.
Чтобы запустить sandbox и пройти этот урок целиком, нужен соответствующий курс. Внутри - ещё много практических уроков того же уровня и сквозной прогресс.
дальше →
You can dissect a process now. The neighboring pain in production is
"the disk is full." Next: df/du, the classic trick with a
deleted-but-open file, and why du sometimes disagrees with df.