Puppet Environment - Puppet (software)

What is Puppet Environment?

In software development and delivery model, there are totally different kind of testing environments that are used for testing a specific product or a service. As a typical practice, there are chiefly 3 kind of environments as development, testing and production, whereby every of them have their own set configuration.

Puppet supports the management of multiple environment on constant line as Ruby on Rails. The key issue behind the creation of those environments is providing a simple mechanism for managing at completely different levels of SLA agreement. In some cases, the machine always needs to be up without any tolerance and use of previous software system. whereby alternative environments are up-to-date and are used for testing functions. they're used for upgrades for additional vital machines. Puppet recommends to stay with the standard production, testing, and development setting configuration, however, here it even provides the user with a leverage of making custom environments as per demand.

Environment Goal

The main goal of setup split by an environment, is that Puppet will have totally different sources for modules and manifests. One will then take a look at the changes in configuration within the testing environment while not impacting the production nodes. These environments may be wont to deploy infrastructure on totally different sources of network.

Using the environment on Puppet Master

The point of an setting is to check that manifest, module, template of the file must be send to the client. Thus, Puppet should be organized to produce environment-specific source for these data.

Puppet environments are implemented just by adding the pre-environment sections to the server’s puppet.conf and selecting totally different configuration source for each setting. These pre-environment sections are then utilized in preference to the most section.

In the above code, any client in the advance environment will use the site.pp manifest file located in the directory /usr/share/puppet/development and Puppet will search for any module in /usr/share/puppet/development/modules directory.

Running Puppet with or without any environment would default to site.pp file and the directory stated in the manifest and modulepath values in the key configuration section.

There are only limited configurations which truly makes sense to be configured preenvironment, and all of those parameters revolve around specifying what files to use to compile a client’s configuration.

Resulting are the parameters.

  • Modulepath − In Puppet, as a rudimentary standard mode it’s best to have a standard module directory that all environment share and then a pre-environment directory where the custom module can be stored. Module path is the location where Puppet looks for all the environment related configuration files.
  • Templatedir − Template directory is the place where all the versions of associated templates are saved. The module must be preferred to these settings, though it lets one to have different versions of a given template in each environment.
  • Manifest − This describes which configuration to use as entrypoint script.
  • With various modules, Puppets help in getting the modularity for configurations. One can use numerous environments in Puppet which works much well if one trusts mainly on modules. It is calmer to migrate changes to environments by summarizing changes in the module. File server uses an environment exact module path; if one does file serving from modules, in its place of separate mounted directories, this environment will be able to get environment-specific files and finally the current environment will also be available in $environment variable within the manifest file.

Setting the Clients Environment

All the configurations associated to environment configuration are finished on puppet.conf file. To specify which environment the Puppet client must use, one can state a value for the environment configuration variable in client’s puppet.conf file.

The above definition in configuration file describes which environment the configuration file is in our case it is testing.
One can also state this on the command line using −

Alternatively, Puppet additionally supports the utilization of dynamic values in environment configuration. instead of process the static values, the developer incorporates a leverage to form custom facts that makes client environment based mostly upon another client attributes or an external data source. the preferred means of doing it's using a custom tool. These tools are capable of specifying a node’s environment and are typically far better at specifying node info.

Puppet Search Path

Puppet uses a straightforward search path to see that configuration must be applied on the target machine. within the same manner, search path in Puppet is extremely helpful once it's attempting to select up appropriate values that must be applied. There are multiple locations as listed below wherever Puppet searches for the values that must be applied.

  • Value specified in the command line
  • Values specified in an environment-specific section
  • Values specified in an executable-specific section
  • Values specified in the main section

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