118 lines
4 KiB
Text
118 lines
4 KiB
Text
cdist-manifest(7)
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=================
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Nico Schottelius <nico-cdist--@--schottelius.org>
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NAME
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----
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cdist-manifest - Define types to be used
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DEFINE STATE IN THE INITIAL MANIFEST
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------------------------------------
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The **initial manifest** is the entry point for cdist to find out, which
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**objects** to configure on the selected host. Objects are instances of
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**types**, like in object orientated programming languages.
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An object is represented by the
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type + slash + object name: ***__file/etc/cdist-configured*** is an
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object of the type ***__file*** with the name ***etc/cdist-configured***.
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Cdist searches for the initial manifest at **conf/manifest/init** and
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executes it as a shell script using **/bin/sh -e**.
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Within this initial manifest, you define, which objects should be
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created on which host. To distinguish between hosts, you can use the
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environment variable **__target_host**. Let's have a look at a simple
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example:
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--------------------------------------------------------------------------------
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__cdistmarker
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case "$__target_host" in
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localhost)
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__directory /home/services/kvm-vm --parents yes
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;;
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esac
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--------------------------------------------------------------------------------
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This manifest says: Independent of the host, always use the type
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***__cdistmarker***, which creates the file **/etc/cdist-configured**,
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with the timestamp as content.
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The directory ***/home/services/kvm-vm***, including all parent directories,
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is only created on the host ***localhost***.
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As you can see, there is no magic involved, the manifest is simple shell code that
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utilises cdist types. Every available type can be executed like a normal
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command. Use **ls conf/type** to get a list of available types. If you have
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setup the MANPATH correctly as, you can use **man cdist-reference** to access
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the reference with pointers to the manpages.
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DESCRIPTION
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-----------
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Manifests exist to define which configurations should be applied to a specific
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host as well as to define which configurations should be applied within a
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type. Manifests are executed locally and the resulting objects are stored in
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an internal database.
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The same object can be redefined in multiple different manifests as long as
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the parameters are exactly the same.
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In general, manifests are used to define which types are used depending
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on given conditions.
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EXAMPLE
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-------
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The initial manifest may for instance contain the following code:
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--------------------------------------------------------------------------------
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# Always create this file, so other sysadmins know cdist is used.
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__file /etc/cdist-configured --type file
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case "$__target_host" in
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my.server.name)
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__file /root/bin/ --type directory
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__file /etc/issue.net --type file --source "$__manifest/issue.net
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;;
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esac
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--------------------------------------------------------------------------------
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The manifest of the type "nologin" may look like this:
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--------------------------------------------------------------------------------
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__file /etc/nologin --type file --source "$__type/files/default.nologin"
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--------------------------------------------------------------------------------
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DEPENDENCIES
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------------
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If you want to describe that something requires something else, just
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setup the variable "require" to contain the requirements. Multiple
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requirements can be added white space seperated.
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--------------------------------------------------------------------------------
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# No dependency
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__file /etc/cdist-configured
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# Require above object
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require="__file/etc/cdist-configured" __link /tmp/cdist-testfile \
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--source /etc/cdist-configured --type symbolic
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# Require two objects
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require="__file/etc/cdist-configured __link/tmp/cdist-testfile" \
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__file /tmp/cdist-another-testfile
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--------------------------------------------------------------------------------
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SEE ALSO
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--------
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- cdist-type(7)
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COPYING
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-------
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Copyright \(C) 2010-2012 Nico Schottelius. Free use of this software is
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granted under the terms of the GNU General Public License version 3 (GPLv3).
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