If the node where you're running this command is configured to talk to PuppetDBthe command uses the requested node's most recent facts. The purpose of Hiera is to provide different values for different nodes use specific node facts to explore your data. You can provide multiple lookup keys to this command, but it only returns a value for the first found key, omitting the rest. With -explainlookup always exits with 0 unless there is a major error. If -explain isn't specified, lookup exits with 0 if a value was found and 1 if not. If possible, the lookup command uses the requested node's real stored facts from PuppetDB. By default, puppet lookup uses facts from the node you run the command on, but you can get data for any other node with the -node NAME option. Hiera relies on a node's facts to locate the relevant data sources.

The puppet lookup command searches your Hiera data and returns a value for the requested lookup key, so you can test and explore your data. You can log into a Puppet Server node and run puppet lookup with sudo. You must run it on a node that has a copy of your Hiera data. The puppet lookup command lets you do Hiera lookups from the command line. The puppet lookup command is the command line interface CLI for Puppet 's lookup function. When Hiera searches, it first searches the global layer, then the environment layer, and finally the module layer - where it only searches in modules that have a matching namespace. Hiera can either return the first value it finds, or continue to search and merge all the values together. Hiera uses a hierarchy of data sources, and a given key can have values in multiple sources. When looking up a key, Hiera searches up to four hierarchy layers of data, in the following order.ĭefault global hiera. You can also configure the lookup function to merge multiple values into one. By default, the lookup function returns the first value found and fails compilation if no values are available. The lookup function uses Hiera to retrieve a value for a given key.

If any parameters have no value and no default, Puppet fails compilation with an error. If a parameter still has no value, Puppet uses the default value from the parameter's default value expression in the class's definition. If you're doing a resource-like declaration, Puppet uses parameters that are explicitly set if explicitly setting undef, a looked up value or default is used. There are several ways Puppet sets values for class parameters, in this order. Most classes need configuration, and you can specify them as parameters to a class as this looks up the needed data if not directly given when the class is included in a catalog.

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