Module: `config`

Terraform module to convert local and remote YAML configuration templates into Terraform lists and maps.

Introduction

The module accepts paths to local and remote YAML configuration template files and converts the templates into Terraform lists and maps for consumption in other Terraform modules.

The module can accept a map of parameters for interpolation within the YAML config templates.

The module also supports a top-level import attribute in map configuration templates, which will include the file and perform a deep merge. Up to 10 levels of imports hierarchy are supported, and all imported maps are deep merged into a final configuration map.

For example, if you have a config file like this (e.g. myconfig.yaml):

  import:
    - file1
    - file2

Then, this module will deep merge file1.yaml and file2.yaml into myconfig.yaml.

Note: Do not include the extensions (e.g. .yaml) in the imports.

Attributions

Big thanks to Imperative Systems Inc. for the excellent deepmerge Terraform module to perform a deep map merge of standard Terraform maps and objects.

Usage

For a complete example, see examples/complete.

For automated tests of the complete example using bats and Terratest (which tests and deploys the example on Datadog), see test.

For an example of using local config maps with import and deep merging into a final configuration map, see examples/imports-local.

For an example of using remote config maps with import and deep merging into a final configuration map, see examples/imports-remote.

Examples

Example of local and remote maps and lists configurations with interpolation parameters

module "yaml_config" {
  source = "cloudposse/config/yaml"
  # Cloud Posse recommends pinning every module to a specific version
  # version     = "x.x.x"

  map_config_local_base_path = "./config"

  map_config_paths = [
    "map-configs/*.yaml",
    "https://raw.githubusercontent.com/cloudposse/terraform-opsgenie-incident-management/master/examples/config/resources/services.yaml",
    "https://raw.githubusercontent.com/cloudposse/terraform-opsgenie-incident-management/master/examples/config/resources/team_routing_rules.yaml"
  ]

  list_config_local_base_path = "./config"

  list_config_paths = [
    "list-configs/*.yaml",
    "https://raw.githubusercontent.com/cloudposse/terraform-aws-service-control-policies/master/examples/complete/policies/organization-policies.yaml"
  ]

  parameters = {
    param1 = "1"
    param2 = "2"
  }

  context = module.this.context
}

Example of local maps configurations with `import` and deep merging

In the example, we use two levels of imports, and the module deep merges the local config files imports-level-3.yaml, imports-level-2.yaml, and imports-level-1.yaml into a final config map.

See examples/imports-local for more details.

module "yaml_config" {
  source = "cloudposse/config/yaml"
  # Cloud Posse recommends pinning every module to a specific version
  # version     = "x.x.x"

  map_config_local_base_path = "./config"

  map_config_paths = [
    "imports-level-1.yaml"
  ]

  context = module.this.context
}

Example of remote maps configurations with with `import` and deep merging

In the example, we use two levels of imports, and the module deep merges the remote config files globals.yaml, ue2-globals.yaml, and ue2-prod.yaml into a final config map.

See examples/imports-remote for more details.

module "yaml_config" {
  source = "cloudposse/config/yaml"
  # Cloud Posse recommends pinning every module to a specific version
  # version     = "x.x.x"

  map_config_remote_base_path = "https://raw.githubusercontent.com/cloudposse/atmos/master/example/stacks"

  map_config_paths = [
    "https://raw.githubusercontent.com/cloudposse/atmos/master/example/stacks/ue2-prod.yaml"
  ]

  context = module.this.context
}

Variables

Required Variables

Optional Variables

append_list_enabled (bool) optional

A boolean flag to enable/disable appending lists instead of overwriting them.

Default value: false

deep_copy_list_enabled (bool) optional

A boolean flag to enable/disable merging of list elements one by one.

Default value: false

list_config_local_base_path (string) optional

Base path to local YAML configuration files of list type

Default value: ""

list_config_paths (list(string)) optional

Paths to YAML configuration files of list type

Default value: [ ]

list_config_remote_base_path (string) optional

Base path to remote YAML configuration files of list type

Default value: ""

map_config_local_base_path (string) optional

Base path to local YAML configuration files of map type

Default value: ""

map_config_paths (list(string)) optional

Paths to YAML configuration files of map type

Default value: [ ]

map_config_remote_base_path (string) optional

Base path to remote YAML configuration files of map type

Default value: ""

map_configs (any) optional

List of existing configurations of map type. Deep-merging of the existing map configs takes precedence over the map configs loaded from YAML files

Default value: [ ]

parameters (map(string)) optional

Map of parameters for interpolation within the YAML config templates

Default value: { }

remote_config_selector (string) optional

String to detect local vs. remote config paths

Default value: "://"

Context Variables

The following variables are defined in the context.tf file of this module and part of the terraform-null-label pattern.

additional_tag_map (map(string)) optional

Additional key-value pairs to add to each map in tags_as_list_of_maps. Not added to tags or id.
This is for some rare cases where resources want additional configuration of tags
and therefore take a list of maps with tag key, value, and additional configuration.

Required: No

Default value: { }

attributes (list(string)) optional

ID element. Additional attributes (e.g. workers or cluster) to add to id,
in the order they appear in the list. New attributes are appended to the
end of the list. The elements of the list are joined by the delimiter
and treated as a single ID element.

Required: No

Default value: [ ]

context (any) optional

Single object for setting entire context at once.
See description of individual variables for details.
Leave string and numeric variables as null to use default value.
Individual variable settings (non-null) override settings in context object,
except for attributes, tags, and additional_tag_map, which are merged.

Required: No

Default value:

{
  "additional_tag_map": {},
  "attributes": [],
  "delimiter": null,
  "descriptor_formats": {},
  "enabled": true,
  "environment": null,
  "id_length_limit": null,
  "label_key_case": null,
  "label_order": [],
  "label_value_case": null,
  "labels_as_tags": [
    "unset"
  ],
  "name": null,
  "namespace": null,
  "regex_replace_chars": null,
  "stage": null,
  "tags": {},
  "tenant": null
}

delimiter (string) optional

Delimiter to be used between ID elements.
Defaults to - (hyphen). Set to "" to use no delimiter at all.

Required: No

Default value: null

descriptor_formats (any) optional

Describe additional descriptors to be output in the descriptors output map.
Map of maps. Keys are names of descriptors. Values are maps of the form
\{<br/> format = string<br/> labels = list(string)<br/> \}
(Type is any so the map values can later be enhanced to provide additional options.)
format is a Terraform format string to be passed to the format() function.
labels is a list of labels, in order, to pass to format() function.
Label values will be normalized before being passed to format() so they will be
identical to how they appear in id.
Default is {} (descriptors output will be empty).

Required: No

Default value: { }

enabled (bool) optional

Set to false to prevent the module from creating any resources
Required: No

Default value: null

environment (string) optional

ID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT'
Required: No

Default value: null

id_length_limit (number) optional

Limit id to this many characters (minimum 6).
Set to 0 for unlimited length.
Set to null for keep the existing setting, which defaults to 0.
Does not affect id_full.

Required: No

Default value: null

label_key_case (string) optional

Controls the letter case of the tags keys (label names) for tags generated by this module.
Does not affect keys of tags passed in via the tags input.
Possible values: lower, title, upper.
Default value: title.

Required: No

Default value: null

label_order (list(string)) optional

The order in which the labels (ID elements) appear in the id.
Defaults to ["namespace", "environment", "stage", "name", "attributes"].
You can omit any of the 6 labels ("tenant" is the 6th), but at least one must be present.

Required: No

Default value: null

label_value_case (string) optional

Controls the letter case of ID elements (labels) as included in id,
set as tag values, and output by this module individually.
Does not affect values of tags passed in via the tags input.
Possible values: lower, title, upper and none (no transformation).
Set this to title and set delimiter to "" to yield Pascal Case IDs.
Default value: lower.

Required: No

Default value: null

labels_as_tags (set(string)) optional

Set of labels (ID elements) to include as tags in the tags output.
Default is to include all labels.
Tags with empty values will not be included in the tags output.
Set to [] to suppress all generated tags.
Notes:
The value of the name tag, if included, will be the id, not the name.
Unlike other null-label inputs, the initial setting of labels_as_tags cannot be
changed in later chained modules. Attempts to change it will be silently ignored.

Required: No

Default value:

[
  "default"
]

name (string) optional

ID element. Usually the component or solution name, e.g. 'app' or 'jenkins'.
This is the only ID element not also included as a tag.
The "name" tag is set to the full id string. There is no tag with the value of the name input.

Required: No

Default value: null

namespace (string) optional

ID element. Usually an abbreviation of your organization name, e.g. 'eg' or 'cp', to help ensure generated IDs are globally unique
Required: No

Default value: null

regex_replace_chars (string) optional

Terraform regular expression (regex) string.
Characters matching the regex will be removed from the ID elements.
If not set, "/[^a-zA-Z0-9-]/" is used to remove all characters other than hyphens, letters and digits.

Required: No

Default value: null

stage (string) optional

ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release'
Required: No

Default value: null

tags (map(string)) optional

Additional tags (e.g. {'BusinessUnit': 'XYZ'}).
Neither the tag keys nor the tag values will be modified by this module.

Required: No

Default value: { }

tenant (string) optional

ID element (Rarely used, not included by default). A customer identifier, indicating who this instance of a resource is for
Required: No

Default value: null

Outputs

all_imports_list: List of all imported YAML configurations
all_imports_map: Map of all imported YAML configurations
list_configs: Terraform lists from YAML configurations
map_configs: Terraform maps from YAML configurations

Dependencies

Requirements

terraform, version: >= 0.13.0
http, version: >= 2.0
local, version: >= 1.3
template, version: >= 2.2

Modules

Name	Version	Source	Description
`maps_deepmerge`	latest	`./modules/deepmerge`	n/a
`this`	0.25.0	`cloudposse/label/null`	n/a
`yaml_config_1`	latest	`./modules/yaml-config`	n/a
`yaml_config_10`	latest	`./modules/yaml-config`	n/a
`yaml_config_2`	latest	`./modules/yaml-config`	n/a
`yaml_config_3`	latest	`./modules/yaml-config`	n/a
`yaml_config_4`	latest	`./modules/yaml-config`	n/a
`yaml_config_5`	latest	`./modules/yaml-config`	n/a
`yaml_config_6`	latest	`./modules/yaml-config`	n/a
`yaml_config_7`	latest	`./modules/yaml-config`	n/a
`yaml_config_8`	latest	`./modules/yaml-config`	n/a
`yaml_config_9`	latest	`./modules/yaml-config`	n/a

Module: config

Introduction​

Attributions​

Usage​

Examples​

Example of local and remote maps and lists configurations with interpolation parameters​

Example of local maps configurations with import and deep merging​

Example of remote maps configurations with with import and deep merging​

Variables​

Required Variables​

Optional Variables​

Context Variables​

Outputs​

Dependencies​

Requirements​

Modules​

Module: `config`

Introduction

Attributions

Usage

Examples

Example of local and remote maps and lists configurations with interpolation parameters

Example of local maps configurations with `import` and deep merging

Example of remote maps configurations with with `import` and deep merging

Variables

Required Variables

Optional Variables

Context Variables

Outputs

Dependencies

Requirements

Modules