Template

Template

The Template resource allows the processing of templates, outputing the result as a file.

Templating uses the Handlebars language which is Mustache template language can be found at the following location:Mustache templating language details.

resource "template" "name" {
  ...
}

Template Functions

The template resource provides custom functions that can be used inside your templates as shown in the example below.

resource "template" "consul_config" {

  source = <<-EOF

  file_content = "{{ file "./myfile.txt" }}"
  quote = {{quote something}}
  trim = {{quote (trim with_whitespace)}}

  EOF

  destination = "./consul_config/consul.hcl"
}

quote [string]

Returns the original string wrapped in quotations, quote can be used with the Go template pipe modifier.

// given the string abc

quote "abc" // would return the value "abc"

trim [string]

Removes whitespace such as carrige returns and spaces from the begining and the end of the string, can be used with the Go template pipe modifier.

// given the string abc

trim " abc " // would return the value "abc"

Attributes

Attribute	Description
Source source required type: string	Local path to the template source file source = "myfile.txt" source = <<-EOF My inline content EOF
Destination destination required type: string	The destination to write the processed template to. destination = "${data("config")}/config.toml"
Variables variables type: map[string]any	Variables to use with the template, variables are available to be used within the template using the `go template` syntax. variables = { data_dir = "/tmp" } Given the above variables, these could be used within a template with the following convention. data_dir = "{{data_dir}}"

Computed Attributes

These attributes are computed when the config is parsed and applied, and are therefore only known at parsetime or runtime.

Attribute	Description
Meta ID meta.id string	The full ID of the resource e.g. `resource.type.name`. This is computed from the full resource path: // given the following resource resource "container" "ubuntu" { ... } // the resulting id will be resource.container.ubuntu
Meta Type meta.type string	The type of the resource. This taken from the type label of the resource definition. // given the following resource resource "container" "ubuntu" { ... } // the resulting type will be container
Meta Name meta.name string	The name of the resource. This taken from the name label of the resource definition. // given the following resource resource "container" "ubuntu" { ... } // the resulting name will be ubuntu

Examples

Template using HereDoc

resource "template" "consul_config" {

  source = <<-EOF
  data_dir = "{{data_dir}}"
  log_level = "DEBUG"

  datacenter = "dc1"
  primary_datacenter = "dc1"

  server = true

  bootstrap_expect = 1
  ui = true

  bind_addr = "0.0.0.0"
  client_addr = "0.0.0.0"
  advertise_addr = "10.6.0.200"

  ports {
    grpc = 8502
  }

  connect {
    enabled = true
  }
  EOF

  destination = "./consul_config/consul.hcl"

  variables = {
    data_dir = "/tmp"
  }
}

data_dir = "/tmp"
log_level = "DEBUG"

datacenter = "dc1"
primary_datacenter = "dc1"

server = true

bootstrap_expect = 1
ui = true

bind_addr = "0.0.0.0"
client_addr = "0.0.0.0"
advertise_addr = "10.6.0.200"

ports {
  grpc = 8502
}

connect {
  enabled = true
}

External Files

resource "template "consul_config" {

  source = file("./mytemplate.hcl")
  destination = "./consul_config/consul.hcl"

  variables = {
    data_dir = "/tmp"
  }
}

container "consul" {
  depends_on = ["template.consul_config"]

  image   {
    name = "consul:${variable.consul_version}"
  }

  command = ["consul", "agent", "-config-file=/config/consul.hcl"]

  volume {
    source      = resource.template.consul_config.destination
    destination = "/config/consul.hcl"
  }
}

Inline variables

resource "template" "consul_config" {

source = <<-EOF
data_dir = "${data("test")}"
log_level = "DEBUG"

datacenter = "${variable.datacenter}"

server = ${variable.server}
EOF

destination = "./consul_config/consul.hcl"

}