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92 lines
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ReStructuredText
92 lines
3.0 KiB
ReStructuredText
==============================================================================
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Finit — A fast plugin-based /sbin/init with service monitoring
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==============================================================================
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Welcome to finit!
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This is a heavily extended version of the original /sbin/init replacement
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finit_. The original was a reimplementation of the EeePC "fastinit" daemon
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based on its system calls with gaps filled with frog DNA.
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Focus of this extended version is on small embedded GNU/Linux systems and
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headless miniature servers with a need for extremely fast boot. In such
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environments configurations rarely change and setup is rather static and
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straight forward.
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In the world of finit we write C "scripts" to boot our system, this is what
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gives the system its raw performance and the user full control.
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If you chose finit you know what you want, a fast boot with no hassle.
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Features
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--------
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**Service monitoring**
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Restarting a service when it exits
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**Plugins**
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Extend and modify finit behavior. See examples in plugins/ directory.
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Plugin capabilities:
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* Service callbacks — should the service run/restart/stop?
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* Hooks — hook into the boot at predefined points to extend finit
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* I/O — listen to external events and control finit behaviour/services
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Most extensions and functionality not purely related to what an /sbin/init
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needs to start a system from the original finit_ has been reactored into
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plugins with either hooks or I/O demands.
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/etc/finit.conf
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---------------
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Contrary to most script based init alternatives (SysV init_, upstart_, OpenRC_
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and the likes) finit reads its configuration from /etc/finit.conf, see the
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source code for available options.
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Try out the examples/finit.conf for a Debian 6.0 example configuration
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capable of service monitoring SSH, sysklogd, gdm and a console getty!
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/etc/finit.d
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------------
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At the end of the boot, when networking and all services are up, finit calls
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its built-in run-parts(8) on the /etc/finit.d/ directory, akin to how the
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/ec/rc.local file works in most other inits, only finit runs a directory of
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scripts. This replaces the earlier /usr/sbin/services.sh support of the
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original finit_.
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Rebooting and Halting
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---------------------
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Finit handles SIGUSR1 and SIGUSR2 for reboot and halt, and listens to
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/dev/initctl so standard Linux reboot and halt commands should also
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work.
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Debugging
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---------
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Add finit_debug, or --debug, to the kernel command line to enable trace
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messages. A console getty is always started, see the file finit.h for
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more useful comile-time tweaks.
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Contact
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-------
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Finit is maintained collaborativly at https://github.com/troglobit/finit —
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please file a bug report, clone it, or send pull requests for bug fixes and
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proposed extensions, or become a co-maintainer by contacting the main author.
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Regards
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/Joachim Nilsson <troglobit@gmail.com>
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.. _finit: http://helllabs.org/finit/
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.. _init: http://savannah.nongnu.org/projects/sysvinit
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.. _upstart: http://upstart.ubuntu.com/
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.. _openrc: http://www.gentoo.org/proj/en/base/openrc/
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