Terraform configuration language syntax

 

Terraform configuration language syntax

Other pages on this segment have defined diverse configuration constructs which can seem withinside the Terraform language. This web page describes the lower-stage syntax of the language in greater detail, revealing the constructing blocks that the ones constructs are constructed from.

 This web page describes the local syntax of the Terraform language that is a wealthy language designed to be especially smooth for human beings to study and write. The constructs withinside the Terraform language also can be expressed in JSON syntax, that is more difficult for human beings to study and edit however less difficult to generate and parse programmatically.

This low-stage syntax of the Terraform language is described in phrases of a syntax referred to as HCL, which is likewise utilized by configuration languages in different applications, and especially different HashiCorp products. It isn't important to recognize all the info of HCL syntax with the intention to use Terraform, and so this web page summarizes the maximum crucial info. If you're interested, you may discover a complete definition of HCL syntax withinside the HCL local syntax specification.

Arguments and Blocks

Arguments and Blocks. The Terraform language syntax is constructed round key syntax constructs: arguments and blocks. Arguments an argument assigns a fee to a specific name. The identifier earlier than the equals signal is the argument name, and the expression after the equals signal is the argument's fee. The context in which the argument seems determines what fee kinds are valid (for instance, every aid kind has a schema that defines the kinds of its arguments), however many arguments receive arbitrary expressions, which permit the fee to both be designated actually or generated from different values programmatically.

Blocks

Blocks a block is a field for different content. A block has a kind (aid on this instance). Each block kind defines what number of labels have to comply with the kind key-word. The aid block kind expects labels, which can be aws_instance and instance in the instance above. A specific block kind can also additionally have any quantity of required labels, or it can require none as with the nested network interface block kind.

 After the block kind key-word and any labels, the block frame is delimited through the characters. Within the block frame, similarly arguments and blocks can be nested, developing a hierarchy of blocks and their related arguments.

The Terraform language makes use of a confined quantity of top-stage block kinds, which can be blocks which can seem out of doors of every other block in a configuration file. Most of Terraform features (such as resources, enter variables, output values, information sources, etc.) are applied as top-stage blocks.

Identifiers

Argument names, block kind names, and the names of maximum Terraform-precise constructs like resources, enter variables, etc. are all identifiers.

Identifiers can incorporate letters, digits, underscores (_), and hyphens (-). The first individual of an identifier ought to now no longer be a digit, to keep away from ambiguity with literal numbers.

For whole identifier rules, Terraform implements the Unicode identifier syntax, prolonged to consist of the ASCII hyphen individual -.

Comments

The Terraform language helps 3 unique syntaxes for feedback:

• # starts off evolved a single-line remark, finishing on the quilt of the line.

• // additionally starts off evolved a single-line remark, as an opportunity to #.

• /* and */ are begin and quit delimiters for a remark that could span over a couple of lines.

The # single-line remark fashion is the default remark fashion and must be utilized in maximum cases. Automatic configuration formatting gear may also robotically rework // feedback into # feedback, for the reason that double-reduce fashion isn't idiomatic.

Character Encoding and Line Endings

Terraform configuration documents ought to usually be UTF-eight encoded. While the delimiters of the language are all ASCII characters, Terraform accepts non-ASCII characters in identifiers, feedback, and string values.

Terraform accepts configuration documents with both Unix-fashion line endings (LF only) or Windows-fashion line endings (CR then LF), however the idiomatic fashion is to apply the Unix convention, and so automated configuration formatting gear may also robotically rework CRLF endings to LF.

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