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< title > 2. Why should I use cdist? — cdist 4.10.7 documentation< / title >
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< li class = "toctree-l1" > < a class = "reference internal" href = "cdist-intro.html" > 1. cdist - usable configuration management< / a > < / li >
< li class = "toctree-l1 current" > < a class = "current reference internal" href = "#" > 2. Why should I use cdist?< / a > < ul >
< li class = "toctree-l2" > < a class = "reference internal" href = "#known-language" > 2.1. Known language< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "#powerful-language" > 2.2. Powerful language< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "#more-than-shell-scripting" > 2.3. More than shell scripting< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "#zero-dependency-configuration-management" > 2.4. Zero dependency configuration management< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "#push-based-distribution" > 2.5. Push based distribution< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "#highly-scalable" > 2.6. Highly scalable< / a > < / li >
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< li class = "toctree-l1" > < a class = "reference internal" href = "cdist-real-world.html" > 9. Dive into real world cdist< / a > < / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "man1/cdist.html" > 10. cdist(1)< / a > < / li >
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< li class = "toctree-l1" > < a class = "reference internal" href = "cdist-configuration.html" > 12. Configuration< / a > < / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "cdist-manifest.html" > 13. Manifest< / a > < / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "cdist-type.html" > 14. cdist type< / a > < / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "cdist-types.html" > 15. cdist types< / a > < / li >
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< li class = "toctree-l1" > < a class = "reference internal" href = "cdist-parallelization.html" > 18. Parallelization< / a > < / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "cdist-inventory.html" > 19. Inventory< / a > < / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "cdist-trigger.html" > 20. Trigger< / a > < / li >
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< li class = "toctree-l1" > < a class = "reference internal" href = "cdist-integration.html" > 22. cdist integration / using cdist as library< / a > < / li >
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< li class = "toctree-l1" > < a class = "reference internal" href = "cdist-stages.html" > 25. Execution stages< / a > < / li >
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< h1 > 2. Why should I use cdist?< a class = "headerlink" href = "#why-should-i-use-cdist" title = "Permalink to this headline" > ¶< / a > < / h1 >
< p > There are several motivations to use cdist, these
are probably the most popular ones.< / p >
< div class = "section" id = "known-language" >
< h2 > 2.1. Known language< a class = "headerlink" href = "#known-language" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > Cdist is being configured in
< a class = "reference external" href = "https://en.wikipedia.org/wiki/Shell_script" > shell script< / a > .
Shell script is used by UNIX system engineers for decades.
So when cdist is introduced, your staff does not need to learn a new
< a class = "reference external" href = "https://en.wikipedia.org/wiki/Domain-specific_language" > DSL< / a >
or programming language.< / p >
< / div >
< div class = "section" id = "powerful-language" >
< h2 > 2.2. Powerful language< a class = "headerlink" href = "#powerful-language" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > Not only is shell scripting widely known by system engineers,
but it is also a very powerful language. Here are some features
which make daily work easy:< / p >
< blockquote >
< div > < ul class = "simple" >
< li > Configuration can react dynamicly on explored values< / li >
< li > High level string manipulation (using sed, awk, grep)< / li >
< li > Conditional support (< strong > if, case< / strong > )< / li >
< li > Loop support (< strong > for, while< / strong > )< / li >
< li > Support for dependencies between cdist types< / li >
< / ul >
< / div > < / blockquote >
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< div class = "section" id = "more-than-shell-scripting" >
< h2 > 2.3. More than shell scripting< a class = "headerlink" href = "#more-than-shell-scripting" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > If you compare regular shell scripting with cdist, there is one major
difference: When using cdist types,
the results are
< a class = "reference external" href = "https://en.wikipedia.org/wiki/Idempotence" > idempotent< / a > .
In practise that means it does not matter in which order you
call cdist types, the result is always the same.< / p >
< / div >
< div class = "section" id = "zero-dependency-configuration-management" >
< h2 > 2.4. Zero dependency configuration management< a class = "headerlink" href = "#zero-dependency-configuration-management" title = "Permalink to this headline" > ¶< / a > < / h2 >
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< p > Cdist requires very little on a target system. Even better,
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in almost all cases all dependencies are usually fulfilled.
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Cdist does not require an agent or high level programming
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languages on the target host: it will run on any host that
has a < strong > ssh server running< / strong > and a posix compatible shell
(< strong > /bin/sh< / strong > ). Compared to other configuration management systems,
it does not require to open up an additional port.< / p >
< / div >
< div class = "section" id = "push-based-distribution" >
< h2 > 2.5. Push based distribution< a class = "headerlink" href = "#push-based-distribution" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > Cdist uses the push based model for configuration. In this
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scenario, one (or more) computers connect to the target hosts
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and apply the configuration. That way the source host has
very little requirements: Cdist can even run on a sysadmin
notebook that is loosely connected to the network and has
limited amount of resources.< / p >
< p > Furthermore, from a security point of view, only one machine
needs access to the target hosts. No target hosts will ever
need to connect back to the source host, which contains the
full configuration.< / p >
< / div >
< div class = "section" id = "highly-scalable" >
< h2 > 2.6. Highly scalable< a class = "headerlink" href = "#highly-scalable" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > If at some point you manage more hosts than can be handled from
a single source host, you can simply add more resources: Either
add more cores to one host or add hosts.
Cdist will utilise the given resources in parallel.< / p >
< / div >
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