Blue-green deployment

Example of how to implement blue-green deployment using Linux VMs and Azure Load Balancer (L4)

Pre-commit configuration

• Install python3 via windows store
• pip install --upgrade pip
• pip install pre-commit
• Update PATH variable
• pre-commit install

Install terraform docs

• choco install terraform-docs

Install tflint

• choco install tflint

Documentation

• https://github.com/antonbabenko/pre-commit-terraform
• https://github.com/kolosovpetro/AzureTerraformBackend
• https://github.com/terraform-docs/terraform-docs
• https://terraform-docs.io/user-guide/installation/
• https://pre-commit.com/

Storage account configuration file

storage_account_name = "storage_account_name"
container_name       = "container_name"
key                  = "terraform.tfstate"
sas_token            = "sas_token"

Deploy storage account for terraform state

• See CreateAzureStorageAccount.ps1

Module documentation

Requirements

Name	Version
azurerm	=3.71.0

Providers

Name	Version
azurerm	3.71.0

Modules

Name	Source	Version
blue_slot_ubuntu	./modules/ubuntu-vm-public-key-auth	n/a
green_slot_ubuntu	./modules/ubuntu-vm-public-key-auth	n/a
lb	./modules/load_balancer	n/a
network	./modules/network	n/a

Resources

Name	Type
azurerm_lb_nat_rule.blue_ssh_nat	resource
azurerm_lb_nat_rule.green_ssh_nat	resource
azurerm_lb_probe.http_probe	resource
azurerm_lb_rule.http_rule_blue	resource
azurerm_network_interface_backend_address_pool_association.blue_slot_lb_association	resource
azurerm_network_interface_backend_address_pool_association.green_slot_lb_association	resource
azurerm_network_interface_nat_rule_association.blue_ssh_association	resource
azurerm_network_interface_nat_rule_association.green_ssh_association	resource
azurerm_resource_group.public	resource
azurerm_client_config.current	data source

Inputs

Name	Description	Type	Default	Required
ip_configuration_name	Name of the IP configuration	string	n/a	yes
network_interface_name	Name of the network interface	string	n/a	yes
nsg_name	Name of the network security group	string	n/a	yes
os_profile_admin_public_key_path	Specifies the public key of the administrator account.	string	n/a	yes
os_profile_admin_username	Specifies the name of the administrator account.	string	n/a	yes
os_profile_computer_name	Specifies the host OS name of the virtual machine.	string	n/a	yes
prefix	Resources name prefix	string	n/a	yes
resource_group_location	Location of the resource group.	string	n/a	yes
resource_group_name	Resource group name	string	n/a	yes
storage_image_reference_offer	Specifies the offer of the platform image or marketplace image used to create the virtual machine.	string	n/a	yes
storage_image_reference_publisher	The publisher of the image used to create the virtual machine.	string	n/a	yes
storage_image_reference_sku	Specifies the SKU of the platform image or marketplace image used to create the virtual machine.	string	n/a	yes
storage_image_reference_version	Specifies the version of the platform image or marketplace image used to create the virtual machine.	string	n/a	yes
storage_os_disk_caching	Specifies the caching requirements for the OS disk.	string	n/a	yes
storage_os_disk_create_option	Specifies how the virtual machine should be created.	string	n/a	yes
storage_os_disk_managed_disk_type	Specifies the storage account type for the managed disk.	string	n/a	yes
storage_os_disk_name	The name of the OS disk.	string	n/a	yes
subnet_name	Name of the subnet	string	n/a	yes
vm_name	Name of the virtual machine	string	n/a	yes
vm_size	The size of the virtual machine.	string	n/a	yes
vnet_name	Name of the virtual network	string	n/a	yes

Outputs

Name	Description
lb_public_ip	n/a