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Once the kernel has started, it starts the init process, [20] a daemon which then bootstraps the user space, for example by checking and mounting file systems, and starting up other processes. The init system is the first daemon to start (during booting) and the last daemon to terminate (during shutdown).
[1] [2] This oops limit is due to the potential, for example, for attackers to repeatedly trigger an oops and an associated resource leak, which eventually overflows an integer and allows further exploitation.
In a Linux system, for example, the watchdog daemon could attempt to perform a software-initiated restart, which can be preferable to a hardware reset as the file systems will be safely unmounted and fault information will be logged. It is essential, however, to have the insurance provided by a hardware timer, since a software restart can fail ...
The /etc/inittab file sets the default runlevel with the :initdefault: entry. On Unix systems, changing the runlevel is achieved by starting only the missing services (as each level defines only those that are started / stopped). [citation needed] For example, changing a system from runlevel 3 to 4 might only start the local X server. Going ...
systemd is the first daemon to start during booting and the last daemon to terminate during shutdown. The systemd daemon serves as the root of the user space's process tree; the first process (PID 1) has a special role on Unix systems, as it replaces the parent of a process when the original parent terminates. Therefore, the first process is ...
Ctrl-C (in older Unixes, DEL) sends an INT signal ("interrupt", SIGINT); by default, this causes the process to terminate. Ctrl-Z sends a TSTP signal ("terminal stop", SIGTSTP); by default, this causes the process to suspend execution. [4] Ctrl-\ sends a QUIT signal ; by default, this causes the process to terminate and dump core.
When you get a message from a "MAILER-DAEMON" or a "Mail Delivery Subsystem" with a subject similar to "Failed Delivery," this means that an email you sent was undeliverable and has been bounced back to you. These messages are sent automatically and often include the reason for the delivery failure.
The configuration file /etc/multipath.conf makes many of the DM-MPIO features user-configurable. The multipath command and the kernel daemon multipathd use information found in this file. The file is only consulted during the configuration of the multipath devices. Changes must be made prior to running the multipath command.