162 lines
5.3 KiB
Markdown
162 lines
5.3 KiB
Markdown
cinit is a fast, small and simple init with support for profiles
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## Introduction
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cinit is a fast init system with dependency features and
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profile support. It was orientated on the design of
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Richard Goochs
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[need concept](http://www.atnf.csiro.au/people/rgooch/linux/boot-scripts/)
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and Felix von Leitners
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[minit](http://www.fefe.de/minit/).
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Minit does not support real dependencies (you don't know whether the
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service you depend on really started) and the need concept is somehow
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slow (as seen in gentoo).
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In addition, minit needs libowfat and dietlibc, which may not be found
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on every Unix system.
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### Cinit main features
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* portability: it should run on every Unix
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* true dependencies (soft and hard!)
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* parallel execution
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* highly customisable (see conf/*)
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* profile support (specify what services to start depending on the profile)
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### Why should I use cinit?
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* To significantly speedup the startup process
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* To use highest level of parallelisation at startup
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* To benefit from real dependencies (so called ***needs*** and ***wants***)
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* To easily create profiles that can be chosen at startup (even **before** init is started!)
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### How does cinit work?
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Cinit creates a dependency tree at startup and executes the services.
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A service can have two type of dependencies:
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* ***wants*** describe soft dependencies (i.e. it's not fatal if the wanted service fails to start)
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* ***needs*** describe hard dependencies (if the needed service fails, the depending won't be started)
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Let's have a look at an example:
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A
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(wants)
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/ \
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|------> B \ C
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| / \ / \
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^ (needs) (needs) (wants)
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| D E F
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|------<------(needs)----|
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Or in words:
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* B and C do not have dependencies
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* They will be started at the beginning
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* A wants B and C
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* A waits until B and C are executed and started afterwards,
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independently of the success of B and C
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* A will also be started, if B and C fail to start.
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* D needs B
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* D will only be started, if B is successfully started
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* E needs B and C
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* E will only be started, if both B and C are successfully started
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* F wants C and needs B
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* F will only be started, if B is successfully started
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* F waits until C is started and is started afterwards
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## Getting cinit
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### Development versions
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You can get the latest (development) version via git:
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git clone git://git.schottelius.org/cLinux/cinit.git
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Additionally, the following other git ressources are available:
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* [Gitweb](http://git.schottelius.org/?p=cLinux/cinit.git;a=summary).
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* [Mirror at github](http://github.com/telmich/cinit)
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* [Mirror at gitorious](http://gitorious.org/cinit)
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### Archives
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Have a look at the [archives](archives).
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## Documentation
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The documentation is currently spread all over the ***doc/*** directory
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within the tarball and is being cleaned up. Additionally there
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are two presentations available:
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* [[2005-10-22: (German) speech at Technophil|software/cinit/speeches/2005-10-22]]
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* [[2005-08-06: (German) online speech|software/cinit/speeches/2005-08-06]]
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### Pre-Configuring
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If you want to fine tune cinit parameters, add different path names,
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change the DESTDIR, ... have a look at conf/*.
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### Installing cinit
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You can install cinit parallel to any other init-system, it won't
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kill other init's config nor /sbin/init, if it exists:
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# make all install
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This will create /sbin/cinit.
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If /sbin/init does not exist, it will be linked to /sbin/cinit.
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### Configuring cinit
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You'll have to configure cinit in /etc/cinit and add services,
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before you can use it.
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Please read doc/configuring.cinit for details.
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Please read doc/FAO if there are still questions open.
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There are some testing examples below doc/examples/, to be used
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as a starting point.
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There are currently no tools to merge your existing init-system
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to cinit (like sysvinit-merge, bsd-merge or minit-merge) available,
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but they are in the making (see various bugs in ditz).
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### Configuring the OS / Kernel
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After configuring cinit you need to tell your kernel to boot cinit instead
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of your current init system. How to do that depends on your system:
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* Linux/LILO and Linux/yaboot (ppc):
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* append="init=/sbin/cinit"
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* grub1 and grub2:
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* kernel <normal kernel specification> init=/sbin/cinit
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## Support
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### IRC
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You can join the development ***IRC channel***
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[#cstar on irc.freenode.org](irc://irc.freenode.org/#cstar).
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### Mailing list
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Bug reports, questions, patches, etc. should be send to the
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[cinit mailing list](http://l.schottelius.org/mailman/listinfo/cinit).
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## Related websites
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* [cinit](http://www.nico.schottelius.org/software/cinit/)
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* [cinit mailing list](http://l.schottelius.org/mailman/listinfo/cinit)
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* BSD init systems (same codebase):
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* [FreeBSDs init](http://www.freebsd.org/cgi/cvsweb.cgi/src/sbin/init/)
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* [NetBSDs init](http://cvsweb.netbsd.org/bsdweb.cgi/src/sbin/init/)
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* [OpenBSDs init](http://www.openbsd.org/cgi-bin/cvsweb/src/sbin/init/)
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* [initng](http://www.initng.org/)
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* [minit](http://www.fefe.de/minit/)
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* [runit](http://smarden.org/runit/)
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* [need/simpleinit](http://www.atnf.csiro.au/~rgooch/linux/boot-scripts/)
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* [sys-v-init](ftp://ftp.cistron.nl/pub/people/miquels/sysvinit/)
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* [upstart](http://www.netsplit.com/blog/work/canonical/upstart.html)
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[[!tag unix]]
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