Уровень 0 · материалов: 3
В кластер входят документы о методах управления жизненным циклом системных процессов и серверов, а также о рисках, связанных с их некорректным завершением или перезагрузкой.
Общие признаки: риски критических ошибок системы, остановка процессов и перезагрузка, последствия некорректного завершения работы
Группа выше: Диагностика сбоев и разбор инцидентов
Смысл: The main idea is that force-killing a process with SIGKILL is dangerous because it prevents graceful shutdown and resource cleanup, potentially destabilizing the system; therefore, a sequence of gentler signals should be used first.
Do not use 'kill -9' by default because it prevents processes from cleaning up resources, leading to system instability and orphaned processes.
Смысл: The main idea is that failing to check the return value of fork() can lead to a catastrophic system-wide crash if the resulting -1 is passed to the kill() function, which signals all available processes.
Ignoring a fork() error can lead to calling kill(-1), which potentially terminates all processes on a Linux system if run as root.
Смысл: The main idea is that there is no single 'correct' way to reboot a server; the method must be chosen based on the level of system failure—ranging from a graceful software reboot to a hard power cycle—to avoid permanent data loss or unnecessary physical trips to the data center.
A technical hierarchy of Linux server reboot methods, progressing from standard software commands to emergency kernel triggers and hardware-level power cycles based on the severity of the system crash.