Add support for Flatcar Linux on Azure
* Accept `os_image` "flatcar-stable" and "flatcar-beta" to use Kinvolk's Flatcar Linux images from the Azure Marketplace Note: Flatcar Linux Azure Marketplace images require terms be accepted before use
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Dalton Hubble
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@ -21,6 +21,8 @@ Notable changes between versions.
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* Switch to Azure's new Linux VM and Linux VM Scale Set resources
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* Set controller's Azure disk caching to None
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* Associate subnets (in addition to NICs) with security groups (aesthetic)
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* Add support for Flatcar Container Linux ([#664](https://github.com/poseidon/typhoon/pull/664))
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* Requires accepting Flatcar Linux Azure Marketplace terms
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#### Bare-Metal
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@ -42,6 +42,7 @@ Typhoon is available for [Flatcar Container Linux](https://www.flatcar-linux.org
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| Platform | Operating System | Terraform Module | Status |
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|---------------|------------------|------------------|--------|
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| AWS | Flatcar Linux | [aws/container-linux/kubernetes](aws/container-linux/kubernetes) | stable |
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| Azure | Flatcar Linux | [azure/container-linux/kubernetes](azure/container-linux/kubernetes) | alpha |
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| Bare-Metal | Flatcar Linux | [bare-metal/container-linux/kubernetes](bare-metal/container-linux/kubernetes) | stable |
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| Google Cloud | Flatcar Linux | [google-cloud/container-linux/kubernetes](google-cloud/container-linux/kubernetes) | alpha |
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| Digital Ocean | Flatcar Linux | [digital-ocean/container-linux/kubernetes](digital-ocean/container-linux/kubernetes) | alpha |
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@ -15,8 +15,10 @@ resource "azurerm_dns_a_record" "etcds" {
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}
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locals {
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# Channel for a Container Linux derivative
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# Container Linux derivative
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# coreos-stable -> Container Linux Stable
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# flatcar-stable -> Flatcar Linux Stable
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flavor = split("-", var.os_image)[0]
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channel = split("-", var.os_image)[1]
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}
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@ -52,12 +54,23 @@ resource "azurerm_linux_virtual_machine" "controllers" {
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}
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source_image_reference {
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publisher = "CoreOS"
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offer = "CoreOS"
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publisher = local.flavor == "flatcar" ? "Kinvolk" : "CoreOS"
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offer = local.flavor == "flatcar" ? "flatcar-container-linux" : "CoreOS"
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sku = local.channel
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version = "latest"
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}
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# Gross hack just for Flatcar Linux
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dynamic "plan" {
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for_each = local.flavor == "flatcar" ? [1] : []
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content {
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name = local.channel
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publisher = "kinvolk"
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product = "flatcar-container-linux"
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}
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}
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# network
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network_interface_ids = [
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azurerm_network_interface.controllers.*.id[count.index]
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@ -49,7 +49,7 @@ variable "worker_type" {
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variable "os_image" {
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type = string
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default = "coreos-stable"
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description = "Channel for a Container Linux derivative (coreos-stable, coreos-beta, coreos-alpha)"
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description = "Channel for a Container Linux derivative (coreos-stable, coreos-beta, coreos-alpha, flatcar-stable, flatcar-beta)"
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}
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variable "disk_size" {
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@ -1,6 +1,7 @@
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locals {
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# Channel for a Container Linux derivative
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# coreos-stable -> Container Linux Stable
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# flatcar-stable -> Flatcar Linux Stable
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flavor = split("-", var.os_image)[0]
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channel = split("-", var.os_image)[1]
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}
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@ -24,12 +25,23 @@ resource "azurerm_linux_virtual_machine_scale_set" "workers" {
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}
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source_image_reference {
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publisher = "CoreOS"
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offer = "CoreOS"
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publisher = local.flavor == "flatcar" ? "Kinvolk" : "CoreOS"
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offer = local.flavor == "flatcar" ? "flatcar-container-linux" : "CoreOS"
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sku = local.channel
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version = "latest"
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}
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# Gross hack just for Flatcar Linux
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dynamic "plan" {
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for_each = local.flavor == "flatcar" ? [1] : []
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content {
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name = local.channel
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publisher = "kinvolk"
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product = "flatcar-container-linux"
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}
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}
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# Azure requires setting admin_ssh_key, though Ignition custom_data handles it too
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admin_username = "core"
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admin_ssh_key {
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@ -85,6 +85,15 @@ module "ramius" {
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Reference the [variables docs](#variables) or the [variables.tf](https://github.com/poseidon/typhoon/blob/master/azure/container-linux/kubernetes/variables.tf) source.
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### Flatcar Linux Only
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Flatcar Linux publishes images to the Azure Marketplace and requires accepting their legal terms.
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```
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az vm image terms show --publish kinvolk --offer flatcar-container-linux --plan stable
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az vm image terms accept --publish kinvolk --offer flatcar-container-linux --plan stable
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```
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## ssh-agent
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Initial bootstrapping requires `bootstrap.service` be started on one controller node. Terraform uses `ssh-agent` to automate this step. Add your SSH private key to `ssh-agent`.
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@ -223,7 +232,7 @@ Reference the DNS zone with `azurerm_dns_zone.clusters.name` and its resource gr
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| worker_count | Number of workers | 1 | 3 |
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| controller_type | Machine type for controllers | "Standard_B2s" | See below |
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| worker_type | Machine type for workers | "Standard_DS1_v2" | See below |
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| os_image | Channel for a Container Linux derivative | "coreos-stable" | coreos-stable, coreos-beta, coreos-alpha |
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| os_image | Channel for a Container Linux derivative | "coreos-stable" | coreos-stable, coreos-beta, coreos-alpha, flatcar-stable, flatcar-beta |
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| disk_size | Size of the disk in GB | 40 | 100 |
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| worker_priority | Set priority to Spot to use reduced cost surplus capacity, with the tradeoff that instances can be deallocated at any time | Regular | Spot |
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| controller_clc_snippets | Controller Container Linux Config snippets | [] | [example](/advanced/customization/#usage) |
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@ -42,6 +42,7 @@ Typhoon is available for [Flatcar Container Linux](https://www.flatcar-linux.org
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| Platform | Operating System | Terraform Module | Status |
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|---------------|------------------|------------------|--------|
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| AWS | Flatcar Linux | [aws/container-linux/kubernetes](cl/aws.md) | stable |
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| Azure | Flatcar Linux | [azure/container-linux/kubernetes](cl/azure.md) | alpha |
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| Bare-Metal | Flatcar Linux | [bare-metal/container-linux/kubernetes](cl/bare-metal.md) | stable |
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| Google Cloud | Flatcar Linux | [google-cloud/container-linux/kubernetes](cl/google-cloud.md) | alpha |
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| Digital Ocean | Flatcar Linux | [digital-ocean/container-linux/kubernetes](cl/digital-ocean.md) | alpha |
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