devops-stack-module-metrics-server

A DevOps Stack module to deploy Kubernetes Metrics Server.

The Metrics Server chart used by this module is shipped in this repository as well, in order to avoid any unwanted behaviors caused by unsupported versions.

Current Chart Version Original Repository Default Values

3.11.0

Chart

values.yaml
This module is only used on platforms that do not install Metrics Server by default, such as Amazon EKS and KinD.

Usage

This module can be declared by adding the following block on your Terraform configuration:

module "metrics-server" {
  source = "git::https://github.com/camptocamp/devops-stack-module-metrics-server.git?ref=<RELEASE>"

  argocd_namespace = module.argocd_bootstrap.argocd_namespace

  app_autosync = local.app_autosync

  kubelet_insecure_tls = false # By default is false, but you can enable it, for example on KinD.

  dependency_ids = {
    argocd = module.argocd_bootstrap.id
  }
}

Technical Reference

Dependencies

module.argocd_bootstrap.id

This module depends on Argo CD resources to be deployed, so it needs do be deployed after the module argocd_bootstrap.

Requirements

The following requirements are needed by this module:

Providers

The following providers are used by this module:

Resources

The following resources are used by this module:

Optional Inputs

The following input variables are optional (have default values):

argocd_project

Description: Name of the Argo CD AppProject where the Application should be created. If not set, the Application will be created in a new AppProject only for this Application.

Type: string

Default: null

argocd_labels

Description: Labels to attach to the Argo CD Application resource.

Type: map(string)

Default: {}

destination_cluster

Description: Destination cluster where the application should be deployed.

Type: string

Default: "in-cluster"

target_revision

Description: Override of target revision of the application chart.

Type: string

Default: "v3.0.0"

helm_values

Description: Helm chart value overrides. They should be passed as a list of HCL structures.

Type: any

Default: []

app_autosync

Description: Automated sync options for the Argo CD Application resource.

Type:

object({
    allow_empty = optional(bool)
    prune       = optional(bool)
    self_heal   = optional(bool)
  })

Default:

{
  "allow_empty": false,
  "prune": true,
  "self_heal": true
}

dependency_ids

Description: IDs of the other modules on which this module depends on.

Type: map(string)

Default: {}

resources

Description: Resource limits and requests for metrics-servers’s pods. Follow the style on official documentation to understand the format of the values.

These are the same values as the defaults on the Helm chart. Usually they guarantee good performance for most cluster configurations up to 100 nodes. See the official documentation for more information.

Type:

object({
    requests = optional(object({
      cpu    = optional(string, "100m")
      memory = optional(string, "256Mi")
    }), {})
    limits = optional(object({
      cpu    = optional(string)
      memory = optional(string, "256Mi")
    }), {})
  })

Default: {}

kubelet_insecure_tls

Description: Whether metrics-server should be configured to accept insecure TLS connections when kubelet does not have valit SSL certificates.

Type: bool

Default: false

Outputs

The following outputs are exported:

id

Description: ID to pass other modules in order to refer to this module as a dependency.

Reference in table format

Show tables

= Requirements

Name Version

argocd

>= 6

null

>= 3

utils

>= 1

= Providers

Name Version

utils

>= 1

argocd

>= 6

null

>= 3

= Resources

Name Type

argocd_application.this

resource

argocd_project.this

resource

null_resource.dependencies

resource

null_resource.this

resource

utils_deep_merge_yaml.values

data source

= Inputs

Name Description Type Default Required

argocd_project

Name of the Argo CD AppProject where the Application should be created. If not set, the Application will be created in a new AppProject only for this Application.

string

null

no

argocd_labels

Labels to attach to the Argo CD Application resource.

map(string)

{}

no

destination_cluster

Destination cluster where the application should be deployed.

string

"in-cluster"

no

target_revision

Override of target revision of the application chart.

string

"v3.0.0"

no

helm_values

Helm chart value overrides. They should be passed as a list of HCL structures.

any

[]

no

app_autosync

Automated sync options for the Argo CD Application resource.

 
object({
    allow_empty = optional(bool)
    prune       = optional(bool)
    self_heal   = optional(bool)
  })
 
{
  "allow_empty": false,
  "prune": true,
  "self_heal": true
}

no

dependency_ids

IDs of the other modules on which this module depends on.

map(string)

{}

no

resources

Resource limits and requests for metrics-servers’s pods. Follow the style on official documentation to understand the format of the values.

These are the same values as the defaults on the Helm chart. Usually they guarantee good performance for most cluster configurations up to 100 nodes. See the official documentation for more information. 
object({
    requests = optional(object({
      cpu    = optional(string, "100m")
      memory = optional(string, "256Mi")
    }), {})
    limits = optional(object({
      cpu    = optional(string)
      memory = optional(string, "256Mi")
    }), {})
  })

{}

no

kubelet_insecure_tls

Whether metrics-server should be configured to accept insecure TLS connections when kubelet does not have valit SSL certificates.

bool

false

no

= Outputs

Name Description

id

ID to pass other modules in order to refer to this module as a dependency.