Running Flatcar Container Linux on Microsoft Azure

az group create --name group-1 --location <location>

az vm image terms show --publish kinvolk --offer flatcar-container-linux-free --plan stable-gen2
az vm image terms accept --publish kinvolk --offer flatcar-container-linux-free --plan stable-gen2

az vm create --name node-1 --resource-group group-1 --admin-username core --user-data config.ign --image FlatcarLinuxFreeGen2

$ az vm image list --all -p kinvolk -f flatcar-container-linux-corevm-amd64 -s stable-gen2 --query '[-1]'
{
  "architecture": "x64",
  "offer": "flatcar-container-linux-corevm-amd64",
  "publisher": "kinvolk",
  "sku": "stable-gen2",
  "urn": "kinvolk:flatcar-container-linux-corevm-amd64:stable-gen2:3815.2.0",
  "version": "3815.2.0"
}

$ az vm image list --all --architecture arm64 -p kinvolk -f flatcar -s stable --query '[-1]'
{
  "architecture": "Arm64",
  "offer": "flatcar-container-linux-corevm",
  "publisher": "kinvolk",
  "sku": "stable",
  "urn": "kinvolk:flatcar-container-linux-corevm:stable:3815.2.0",
  "version": "3815.2.0"
}

az sig image-definition list-community --public-gallery-name flatcar-23485951-527a-48d6-9d11-6931ff0afc2e --location westeurope
az sig image-version list-community --public-gallery-name flatcar-23485951-527a-48d6-9d11-6931ff0afc2e --gallery-image-definition flatcar-stable-amd64 --location westeurope

docker run -it --rm quay.io/kinvolk/azure-flatcar-image-upload \
  --resource-group <resource group> \
  --storage-account-name <storage account name>

Put https://mystorage.blob.core.windows.net/vhds?restype=container: dial tcp: lookup iago-dev.blob.core.windows.net on 80.58.61.250:53: no such host

storage: service returned error: StatusCode=403, ErrorCode=AuthenticationFailed, ErrorMessage=Server failed to authenticate the request. Make sure the value of Authorization header is formed correctly including the signature. RequestId:a3ed1ebc-701e-010c-5258-0a2e84000000 Time:2019-05-14T13:26:00.1253383Z, RequestId=a3ed1ebc-701e-010c-5258-0a2e84000000, QueryParameterName=, QueryParameterValue=

docker run -it --rm quay.io/kinvolk/azure-flatcar-image-upload --help

Usage: /usr/local/bin/upload_images.sh [OPTION...]

 Required arguments:
  -g, --resource-group        Azure resource group.
  -s, --storage-account-name  Azure storage account name. Must be between 3 and 24 characters and unique within Azure.

 Optional arguments:
  -c, --channel              Flatcar Container Linux release channel. Defaults to 'stable'.
  -v, --version              Flatcar Container Linux version. Defaults to 'current'.
  -i, --image-name           Image name, which will be used later in Lokomotive configuration. Defaults to 'flatcar-<channel>'.
  -l, --location             Azure location to storage image. To list available locations run with '--locations'. Defaults to 'westeurope'.
  -S, --storage-account-type Type of storage account. Defaults to 'Standard_LRS'.

az vm create ... --admin-username myuser --ssh-key-values ~/.ssh/id_rsa.pub

variant: flatcar
version: 1.0.0
systemd:
  units:
    - name: nginx.service
      enabled: true
      contents: |
        [Unit]
        Description=NGINX example
        After=docker.service
        Requires=docker.service
        [Service]
        TimeoutStartSec=0
        ExecStartPre=-/usr/bin/docker rm --force nginx1
        ExecStart=/usr/bin/docker run --name nginx1 --pull always --log-driver=journald --net host docker.io/nginx:1
        ExecStop=/usr/bin/docker stop nginx1
        Restart=always
        RestartSec=5s
        [Install]
        WantedBy=multi-user.target        

cat cl.yaml | docker run --rm -i quay.io/coreos/butane:latest > ignition.json

az vm create --name node-1 --resource-group group-1 --admin-username core --ssh-key-values ~/.ssh/id_rsa.pub --user-data ./ignition.json --image kinvolk:flatcar-container-linux:stable:3760.2.0
# Alternatively, instead of '--user-data ./ignition.json' you can use: --custom-data "$(cat ./ignition.json)"

variant: flatcar
version: 1.0.0
storage:
  files:
    - path: /opt/chrony/Dockerfile
      mode: 0644
      contents:
        inline: |
          FROM alpine
          RUN apk add chrony
          RUN rm /etc/chrony/chrony.conf          
    - path: /opt/chrony/chrony.conf
      mode: 0644
      contents:
        inline: |
          log statistics measurements tracking
          logdir /var/log/chrony
          driftfile /var/lib/chrony/drift
          makestep 1.0 3
          maxupdateskew 100.0
          dumpdir /var/lib/chrony
          rtcsync
          refclock PHC /dev/ptp0 poll 3 dpoll -2 offset 0 stratum 2          
  directories:
    - path: /opt/chrony/logs
      mode: 0777
systemd:
  units:
    - name: systemd-timesyncd.service
      mask: true
    - name: prepare-chrony.service
      enabled: true
      contents: |
        [Unit]
        Description=Build the chrony container image
        ConditionPathExists=!/opt/chrony-build/done
        [Service]
        Type=oneshot
        RemainAfterExit=true
        Restart=on-failure
        WorkingDirectory=/opt/chrony
        ExecStart=/usr/bin/docker build -t chrony .
        ExecStartPost=/usr/bin/touch done
        [Install]
        WantedBy=multi-user.target        
    - name: chrony.service
      enabled: true
      contents: |
        [Unit]
        Description=Chrony RTC time sync service
        After=docker.service prepare-chrony.service
        Requires=docker.service prepare-chrony.service
        [Service]
        TimeoutStartSec=0
        ExecStartPre=-/usr/bin/docker rm --force chrony
        ExecStart=/usr/bin/docker run --name chrony -i --cap-add=SYS_TIME -v /opt/chrony/logs:/var/log/chrony -v /opt/chrony/chrony.conf:/etc/chrony/chrony.conf --device=/dev/rtc:/dev/rtc --device=/dev/ptp_hyperv:/dev/ptp0 chrony chronyd -s -d
        ExecStop=/usr/bin/docker stop chrony
        Restart=always
        RestartSec=5s
        [Install]
        WantedBy=multi-user.target        

{
  "ignition": {
    "version": "3.3.0"
  },
  "storage": {
    "directories": [
      {
        "path": "/opt/chrony/logs",
        "mode": 511
      }
    ],
    "files": [
      {
        "path": "/opt/chrony/Dockerfile",
        "contents": {
          "compression": "",
          "source": "data:,FROM%20alpine%0ARUN%20apk%20add%20chrony%0ARUN%20rm%20%2Fetc%2Fchrony%2Fchrony.conf%0A"
        },
        "mode": 420
      },
      {
        "path": "/opt/chrony/chrony.conf",
        "contents": {
          "compression": "gzip",
          "source": "data:;base64,H4sIAAAAAAAC/0TMQW4DIQxG4b1P8V+ggSRH6KbLXsEFM0UDA7JN2ty+UhQ1q7f4pNfGBnP2al6ToQvbUulyuMGV016PjdrYclWEG2toYwvpW8dxp6y1eKlNnlK/nhIeQp13MZeJ8yniSp1/18zsYrv84BzjKVJefb7W/wNST3Y/EqmU1Eba8fnxjpDlFqbPiDlawxX50bcLRikmjghzZV8dF/oLAAD//xHNUSnZAAAA"
        },
        "mode": 420
      }
    ]
  },
  "systemd": {
    "units": [
      {
        "mask": true,
        "name": "systemd-timesyncd.service"
      },
      {
        "contents": "[Unit]\nDescription=Build the chrony container image\nConditionPathExists=!/opt/chrony-build/done\n[Service]\nType=oneshot\nRemainAfterExit=true\nRestart=on-failure\nWorkingDirectory=/opt/chrony\nExecStart=/usr/bin/docker build -t chrony .\nExecStartPost=/usr/bin/touch done\n[Install]\nWantedBy=multi-user.target\n",
        "enabled": true,
        "name": "prepare-chrony.service"
      },
      {
        "contents": "[Unit]\nDescription=Chrony RTC time sync service\nAfter=docker.service prepare-chrony.service\nRequires=docker.service prepare-chrony.service\n[Service]\nTimeoutStartSec=0\nExecStartPre=-/usr/bin/docker rm --force chrony\nExecStart=/usr/bin/docker run --name chrony -i --cap-add=SYS_TIME -v /opt/chrony/logs:/var/log/chrony -v /opt/chrony/chrony.conf:/etc/chrony/chrony.conf --device=/dev/rtc:/dev/rtc --device=/dev/ptp_hyperv:/dev/ptp0 chrony chronyd -s -d\nExecStop=/usr/bin/docker stop chrony\nRestart=always\nRestartSec=5s\n[Install]\nWantedBy=multi-user.target\n",
        "enabled": true,
        "name": "chrony.service"
      }
    ]
  }
}

git clone https://github.com/flatcar/flatcar-terraform.git
# From here on you could directly run it, TLDR:
cd azure
export ARM_SUBSCRIPTION_ID="<azure_subscription_id>"
export ARM_TENANT_ID="<azure_subscription_tenant_id>"
export ARM_CLIENT_ID="<service_principal_appid>"
terraform init
# Edit the server configs or just go ahead with the default example
terraform plan
terraform apply

terraform {
  required_version = ">= 0.13"
  required_providers {
    azurerm = {
      source  = "hashicorp/azurerm"
      version = "~>2.0"
    }
    ct = {
      source  = "poseidon/ct"
      version = "0.7.1"
    }
    template = {
      source  = "hashicorp/template"
      version = "~> 2.2.0"
    }
    null = {
      source  = "hashicorp/null"
      version = "~> 3.0.0"
    }
  }
}

provider "azurerm" {
  features {}
}

resource "azurerm_resource_group" "main" {
  name     = "${var.cluster_name}-rg"
  location = var.resource_group_location
}

resource "azurerm_virtual_network" "main" {
  name                = "${var.cluster_name}-network"
  address_space       = ["10.0.0.0/16"]
  location            = azurerm_resource_group.main.location
  resource_group_name = azurerm_resource_group.main.name
}

resource "azurerm_subnet" "internal" {
  name                 = "internal"
  resource_group_name  = azurerm_resource_group.main.name
  virtual_network_name = azurerm_virtual_network.main.name
  address_prefixes     = ["10.0.2.0/24"]
}

resource "azurerm_public_ip" "pip" {
  for_each            = toset(var.machines)
  name                = "${var.cluster_name}-${each.key}-pip"
  resource_group_name = azurerm_resource_group.main.name
  location            = azurerm_resource_group.main.location
  allocation_method   = "Dynamic"
}

resource "azurerm_network_interface" "main" {
  for_each            = toset(var.machines)
  name                = "${var.cluster_name}-${each.key}-nic"
  resource_group_name = azurerm_resource_group.main.name
  location            = azurerm_resource_group.main.location

  ip_configuration {
    name                          = "internal"
    subnet_id                     = azurerm_subnet.internal.id
    private_ip_address_allocation = "Dynamic"
    public_ip_address_id          = azurerm_public_ip.pip[each.key].id
  }
}

resource "azurerm_linux_virtual_machine" "machine" {
  for_each            = toset(var.machines)
  name                = "${var.cluster_name}-${each.key}"
  resource_group_name = azurerm_resource_group.main.name
  location            = azurerm_resource_group.main.location
  size                = var.server_type
  admin_username      = "core"
  custom_data         = base64encode(data.ct_config.machine-ignitions[each.key].rendered)
  network_interface_ids = [
    azurerm_network_interface.main[each.key].id,
  ]

  admin_ssh_key {
    username   = "core"
    public_key = var.ssh_keys.0
  }

  source_image_reference {
    publisher = "kinvolk"
    offer     = "flatcar-container-linux"
    sku       = "stable"
    version   = var.flatcar_stable_version
  }

  plan {
    name      = "stable"
    product   = "flatcar-container-linux"
    publisher = "kinvolk"
  }

  os_disk {
    storage_account_type = "Standard_LRS"
    caching              = "ReadWrite"
  }
}

data "ct_config" "machine-ignitions" {
  for_each = toset(var.machines)
  content  = data.template_file.machine-configs[each.key].rendered
}

data "template_file" "machine-configs" {
  for_each = toset(var.machines)
  template = file("${path.module}/cl/machine-${each.key}.yaml.tmpl")

  vars = {
    ssh_keys = jsonencode(var.ssh_keys)
    name     = each.key
  }
}

variable "resource_group_location" {
  default     = "eastus"
  description = "Location of the resource group."
}

variable "machines" {
  type        = list(string)
  description = "Machine names, corresponding to machine-NAME.yaml.tmpl files"
}

variable "cluster_name" {
  type        = string
  description = "Cluster name used as prefix for the machine names"
}

variable "ssh_keys" {
  type        = list(string)
  description = "SSH public keys for user 'core' (and to register directly with waagent for the first)"
}

variable "server_type" {
  type        = string
  default     = "Standard_D2s_v4"
  description = "The server type to rent"
}

variable "flatcar_stable_version" {
  type        = string
  description = "The Flatcar Stable release you want to use for the initial installation, e.g., 2605.12.0"
}

output "ip-addresses" {
  value = {
    for key in var.machines :
    "${var.cluster_name}-${key}" => azurerm_linux_virtual_machine.machine[key].public_ip_address
  }
}

cluster_name            = "mycluster"
machines                = ["mynode"]
ssh_keys                = ["ssh-rsa AA... [email protected]"]
flatcar_stable_version  = "x.y.z"
resource_group_location = "westeurope"

curl -sSfL https://stable.release.flatcar-linux.net/amd64-usr/current/version.txt | grep -m 1 FLATCAR_VERSION_ID= | cut -d = -f 2

passwd:
  users:
    - name: core
      ssh_authorized_keys: 
        - ${ssh_keys}
storage:
  files:
    - path: /home/core/works
      filesystem: root
      mode: 0755
      contents:
        inline: |
          #!/bin/bash
          set -euo pipefail
          # This script demonstrates how templating and variable substitution works when using Terraform templates for Container Linux Configs.
          hostname="$(hostname)"
          echo My name is ${name} and the hostname is $${hostname}          

az login
az account set --subscription <azure_subscription_id>
az ad sp create-for-rbac --name <service_principal_name> --role Contributor
{
  "appId": "...",
  "displayName": "<service_principal_name>",
  "password": "...",
  "tenant": "..."
}

az vm image terms accept --urn kinvolk:flatcar-container-linux:stable:<flatcar_stable_version>

export ARM_SUBSCRIPTION_ID="<azure_subscription_id>"
export ARM_TENANT_ID="<azure_subscription_tenant_id>"
export ARM_CLIENT_ID="<service_principal_appid>"
export ARM_CLIENT_SECRET="<service_principal_password>"
terraform init
terraform plan
terraform apply

systemd:
  units:
    - name: partition-drive.service
      enabled: true
      contents: |
        [Unit]
        Description="Partition drive"
        Before=docker.service
        ConditionFirstBoot=yes
        [Service]
        Type=oneshot
        RemainAfterExit=yes
        ExecStart=/opt/bin/partition-drive.sh
        [Install]
        WantedBy=first-boot-complete.target
storage:
  files:
    - path: /opt/bin/partition-drive.sh
      mode: 0700
      contents:
        inline: |
          #!/bin/bash
          set -o errexit
          set -o pipefail
          set -o nounset

          disk_device="/dev/disk/azure/scsi1/lun10"
          partition="/dev/disk/azure/scsi1/lun10-part1"

          until [[ -e $disk_device ]]; do echo "Waiting for device" && sleep 1; done

          if [[ -n $(lsblk -no NAME $disk_device | sed -n '2,$p') ]]; then
              echo "Disk $disk_device is partitioned."
          else
              echo 'type=83' | sfdisk /dev/disk/azure/scsi1/lun10
          fi

          sleep 3

          if [[ -n $(lsblk -no FSTYPE $partition) ]]; then
              echo "Partition $partition already formatted."
          else
              mkfs.ext4 -F /dev/disk/azure/scsi1/lun10-part1
          fi