imported>ThorstenStaerk |
imported>ThorstenStaerk |
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| − | How Linux typically starts up on a PC
| + | #REDIRECT [[Mindmapping]] |
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| − | = you switch on the computer =
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| − | BIOS is shown and the devices are check
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| − | = the master boot record is executed =
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| − | = the boot loader is executed =
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| − | The boot loader is typically grub, and there is an older and smaller called lilo.
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| − | = the Linux kernel is executed =
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| − | | |
| − | = the initrd is loaded/executed =
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| − | = the init program is started =
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| − | The Linux kernel starts the init program. Nothing else. If the init process quits, the Linux kernel panics. Init is responsible for all further services and programs that are started.
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| − | | |
| − | = the init script are executed =
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| − | This can be SysV init scripts or upstart or systemd. These init scripts typically start services. Services are grouped into runlevels. E.g. in SUSE the runlevels are defines as
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| − | * 0: reboot
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| − | * 1: rescue system, single user
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| − | * 2: all services that run in (1) plus services needed for multi-user login
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| − | * 3: all services that run in (2) plus network services
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| − | * 4: undefined
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| − | * 5: all services that run in (3) plus graphical display
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| − | Some notable services are:
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| − | * alsasound
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| − | : Used for the alsa sound system
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| − | * cups
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| − | : Used for printing, it is the common Unix printing system
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| − | * dbus
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| − | : Used to call public functions in running programs. Should be abstracted to users.
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| − | * esound
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| − | : Used for enlightenment sound system
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| − | * ntp
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| − | : Network Time Protocol to keep your clock in sync with the real time via the network
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| − | * autofs boot.udev xdm
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| − | * cifs xfs
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| − | * cron ypbind
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| − | * powerd
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| − | * gpm network
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| − | * sshd
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| − | : Service that allows to [[control a computer via the network]]
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| − | = X Windowing system is started =
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| − | = login manager is started =
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| − | = user session incl. Desktop environment is started =
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| − | = See also =
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| − | * http://wiki.linuxquestions.org/wiki/Boot_process
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