189 lines
6 KiB
Text
189 lines
6 KiB
Text
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configuring cinit,
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Nico Schottelius 2005-05-28 (Last Modified: 2005-06-05)
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0. Pre-compile configuration
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1. General configuration layout
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2. Hints
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2.0 Service executing / parameters
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2.1 Daemons
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2.2 Logging
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2.3 Using prepared scripts
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3. Profiles
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0. Pre-compile configuration
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Have a look at conf/*. Those variable will mostly be used when
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compiling cinit. Some will be read later (like destdir).
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1. General configuration layout
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/etc/cinit (configurable via conf/cinit_dir) stores the complete
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cinit configuration.
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cinit is service based.
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A service consists of
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- a base directory (like /etc/cinit/getty/1)
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- dependency configuration:
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./wants - services it wants to be started before (but it
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will work anyway)
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./needs/ - services it needs. If those services fail, this service
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won't be started.
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- a flag indicating whether to respawn the service:
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./respawn (simply touch it)
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- a delay: how long to wait for the service (in seconds) before
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sending SIGKILL after the SIGTERM (only for respawning processes):
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./delay (one line with only the digits)
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If delay is non-existing or not readable, the delay from
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conf/sleep_kill_svc is taken. The maximum length of this
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number ("9999" uses length 4, "42" needs 2 bytes) can be adjusted
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at compile time in conf/max_delay. Internally this is a signed
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integer, so the maximum size depends on your system. Though
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I don't think anybody will want to wait for a service as long as
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an integer would allow.
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- the program to run when switching the service on and off:
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./on (a link to a program or a shell script)
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./on.params (see conf/c_params, the parameters to pass to the program)
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./on.env (see conf/c_env, the environment to pass to the program)
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./off (call that when shutting down the service)
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./off.params (the parameters to pass to the program)
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./on.env (the environment to pass to the program)
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You should have a look at the samples/ directory for examples.
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If things are missing, cinit will continue with what's available.
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This way you only need the files you use. Some examples:
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/etc/cinit/init:
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./wants -> services it wants
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./needs -> services it needs
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That's everything
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/etc/cinit/testsvc:
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on -> link to program
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on.param -> parameters to program
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respawn -> restart it
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That's everything, as it has no dependencies
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/etc/cinit/fullsvc:
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on -> program to start when switching on
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on.params -> parameters to pass to start program
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on.env -> environment to pass to start program
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respawn -> respawn on service
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delay -> wait this time before sending SIGKILL after SIGTERM
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off -> program to start when switching off
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off.params -> parameters to pass to stop program
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off.env -> environment to pass to stop program
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wants/* -> services it wants before starting (non-critical ones)
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needs/* -> links to needed services (critical!) before starting
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2. Hints
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2.0 Service executing / parameters
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The on and off files can and should be links to the programs you want
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to execute. This way you save yourself loading the big shell (which is
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on many Linux systems bash, why so ever, dash does the job as good, still
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beeing small).
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The on.params and off.params files could also be links to system configuration:
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Assume the service is called local-tuning/keyboard. The on script
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could look like:
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on -> /bin/loadkeys
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on.params -> /etc/sys/keyboard.mapping
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And /etc/sys/keyboard.mapping would contain only the string
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"dvorak" (or "de-latin1" or "sg-latin1" or ...).
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2.1 Daemons
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Respawning daemons is a bit more difficult, as daemons do often fork()
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(go to background, the calling process exits).
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This way cinit cannot watch it directly.
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The first solution is to check the documentation of your daemon program,
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if it has a switch to disable forking (Please have a look at
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daemons.backgrounding for a list of known daemons and their switches
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to avoid backgrounding).
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The other possibility is to use a program, which will
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a) start the daemon
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b) look into the pidfile of the daemon
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c) will then wait until that pid does not exist anymore
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d) and then it exits and cinit will restart it (goto a) now)
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Such a program is included into this cinit release,
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though I do not recommend using it. You should better contact the
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authors and make them implement a clean non-forking mode.
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The name of the program (actually a shell script) is "cinit.wait.for.daemon".
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You will use it as the "on" part of the service and you have to add
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a) the pidfile to on.params
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b) the daemon binary
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Thus the service would look like:
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svc-broken-daemon/
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on -> /sbin/cinit.wait.for.daemon
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on.params:
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/var/run/apache.pid
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/usr/packages/apache-2.0.51/bin/httpd
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-DSSL
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Be aware: This is just a hack, first try to avoid backgrounding
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and you won't need this hack!
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2.2 Logging
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Currently there's no special logging support.
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When programs write to stdout, it will be displayed on
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the same stdout cinit is connected to
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(we don't even open /dev/console - we are too lazy currently).
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2.3 Using prepared scripts
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In the bin/ directory of this tarball you'll find at least:
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cinit.add.dependency - add a dependency to a service
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cinit.add.getty - add a new getty
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cinit.create.empty.service - create an empty service
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cinit.reboot - reboot in /bin/sh
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cinit.remove.getty - remove a getty service
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cinit.respawn.off - switch respawing off
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cinit.respawn.on - switch respawing on
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cinit.shutdown - shutdown in /bin/sh
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3. Profiles
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Since cinit-0.0.6 there is profile in cinit.
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Profiles are described in doc/profile.support.
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X. Examples
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Can be found in the tarballs below samples/.
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