1. Terraform for fun and profit
@attachmentgenie

2. ~$ whoami~$ whoami
● I used to be a Molecular Biologist,I used to be a Molecular Biologist,
● Then became a Dev,Then became a Dev,
● Now an Ops.Now an Ops.
● Open Source Consultant @Open Source Consultant @inuits.euinuits.eu

3. The other IaCThe other IaC

4. HCLHCL
● Hashicorp Configuration LanguageHashicorp Configuration Language
● Yet another cfgmgmt DSLYet another cfgmgmt DSL
● Desired stateDesired state

5. ResourcesResources
resourceresource "azurerm_dns_a_record""azurerm_dns_a_record" "foreman""foreman" {{
namename == "foreman""foreman"
zone_namezone_name == "${"${azurerm_dns_zoneazurerm_dns_zone.esoptra_io..esoptra_io.namename}"}"
resource_group_nameresource_group_name == "${"${azurerm_resource_groupazurerm_resource_group.euw1-mgmtdns-rg..euw1-mgmtdns-rg.namename}"}"
ttlttl == 300300
recordsrecords = [= ["${"${azurerm_public_ipazurerm_public_ip.reverseproxy_public_ip..reverseproxy_public_ip.ip_addressip_address}"}"]]
}}

6. ProvidersProviders
● https://www.terraform.io/docs/providers/index.htmhttps://www.terraform.io/docs/providers/index.htm
● Many, many, many optionsMany, many, many options
– Cloud providersCloud providers
– Dns providerDns provider
– gitlabgitlab
● Add your own as a pluginAdd your own as a plugin

7. PluginsPlugins
● https://github.com/terraform-providershttps://github.com/terraform-providers
providerprovider "godaddy""godaddy" {{
keykey == "${var."${var.gd_keygd_key}"}"
secretsecret == "${var."${var.gd_secretgd_secret}"}"
}}

8. modulesmodules
● Basically any subdir is a moduleBasically any subdir is a module
modulemodule "reverseproxy""reverseproxy" {{
sourcesource == "../modules/azure/debian9""../modules/azure/debian9"
azure_region_nameazure_region_name == "${var."${var.azure_region_nameazure_region_name}"}"
blob_endpointblob_endpoint == "${"${azurerm_storage_accountazurerm_storage_account.euw1-forest-storage-acc..euw1-forest-storage-acc.primary_blob_endpointprimary_blob_endpoint}"}"
costcentercostcenter == "${var."${var.costcentercostcenter}"}"
environmentenvironment == "${var."${var.environmentenvironment}"}"
node_namenode_name == "proxy""proxy"
public_ippublic_ip == "${"${azurerm_public_ipazurerm_public_ip.forest_reverseproxy_public_ip..forest_reverseproxy_public_ip.idid}"}"
puppetmaster_ippuppetmaster_ip == "${data."${data.terraform_remote_stateterraform_remote_state..remote_state_mgmtremote_state_mgmt..puppetmaster_ippuppetmaster_ip}"}"
region_nameregion_name == "${var."${var.region_nameregion_name}"}"
resource_groupresource_group == "${"${azurerm_resource_groupazurerm_resource_group.euw1-forest-rg..euw1-forest-rg.namename}"}"
storage_accountstorage_account == "${"${azurerm_storage_accountazurerm_storage_account.euw1-forest-storage-acc..euw1-forest-storage-acc.namename}"}"
subnet_idsubnet_id == "${"${azurerm_subnetazurerm_subnet.euw1-forest-sn-dmz..euw1-forest-sn-dmz.idid}"}"
subnet_namesubnet_name == "${"${azurerm_subnetazurerm_subnet.euw1-forest-sn-dmz..euw1-forest-sn-dmz.namename}"}"
vm_root_usernamevm_root_username == "${var."${var.vm_root_usernamevm_root_username}"}"
vm_root_passwordvm_root_password == "${var."${var.vm_root_passwordvm_root_password}"}"
rolerole == "website""website"
}}

9. registryregistry
● https://registry.terraform.iohttps://registry.terraform.io

10. variablesvariables
variablevariable "region_name""region_name" {}{}
variablevariable "resource_group""resource_group" {}{}
variablevariable "role""role" {{
defaultdefault == "node""node"
}}
variablevariable "storage_account""storage_account" {}{}
variablevariable "subnet_id""subnet_id" {}{}
variablevariable "subnet_name""subnet_name" {}{}
variablevariable "vm_root_username""vm_root_username" {}{}
variablevariable "vm_root_password""vm_root_password" {}{}
variablevariable "vm_size""vm_size" {{
defaultdefault == "Standard_A1_v2""Standard_A1_v2"
}}

11. Terraform.tfvarsTerraform.tfvars
The 'terraform.tfvars' files will need to have severalThe 'terraform.tfvars' files will need to have several
variables set to be able successfully connect to azure.variables set to be able successfully connect to azure.
arm_client_id = "xxxxxxxxx"arm_client_id = "xxxxxxxxx"
arm_client_secret = "xxxxxxxxx"arm_client_secret = "xxxxxxxxx"
arm_subscription_id = "xxxxxxxxx"arm_subscription_id = "xxxxxxxxx"
arm_tenant_id = "xxxxxxxxx"arm_tenant_id = "xxxxxxxxx"
resource_group_name = "euw1-mgmt-rg-deploy"resource_group_name = "euw1-mgmt-rg-deploy"
storage_account_name = "euw1mgmtsadeploy"storage_account_name = "euw1mgmtsadeploy"
container_name = "euw1-mgmt-sc-remote-state"container_name = "euw1-mgmt-sc-remote-state"
key = "mgmt.azure.tfstate"key = "mgmt.azure.tfstate"

12. OutputsOutputs
resourceresource "azurerm_dns_zone""azurerm_dns_zone" "esoptra_io""esoptra_io" {{
namename == "esoptra.io""esoptra.io"
resource_group_nameresource_group_name == "${"${azurerm_resource_groupazurerm_resource_group.euw1-glbldns-rg..euw1-glbldns-rg.namename}"}"
tagstags {{
environmentenvironment == "${var."${var.environmentenvironment}"}"
costCentercostCenter == "${var."${var.costcentercostcenter}"}"
}}
}}
outputoutput "esoptra_eu_name_servers""esoptra_eu_name_servers" {{
valuevalue == "${"${azurerm_dns_zoneazurerm_dns_zone.esoptra_io..esoptra_io.name_serversname_servers}"}"
}}

13. Output ~ inputOutput ~ input
resourceresource "azurerm_dns_zone""azurerm_dns_zone" "esoptra_io""esoptra_io" {{
namename == "esoptra.io""esoptra.io"
resource_group_nameresource_group_name == "${"${azurerm_resource_groupazurerm_resource_group.euw1-glbldns-rg..euw1-glbldns-rg.namename}"}"
tagstags {{
environmentenvironment == "${var."${var.environmentenvironment}"}"
costCentercostCenter == "${var."${var.costcentercostcenter}"}"
}}
}}
outputoutput "esoptra_eu_name_servers""esoptra_eu_name_servers" {{
valuevalue == "${"${azurerm_dns_zoneazurerm_dns_zone.esoptra_io..esoptra_io.name_serversname_servers}"}"
}}
resourceresource "godaddy_domain_record""godaddy_domain_record" "gd_esoptra_io""gd_esoptra_io" {{
domaindomain == "esoptra.io""esoptra.io"
nameserversnameservers = [= ["${"${azurerm_dns_zoneazurerm_dns_zone.esoptra_io..esoptra_io.name_serversname_servers}"}"]]
}}

14. Terraform initTerraform init
$ terraform init -backend-config=terraform.tfvars$ terraform init -backend-config=terraform.tfvars
$ terraform get$ terraform get

15. Terraform fmtTerraform fmt
The solution to tabs vs spacesThe solution to tabs vs spaces

16. Terraform validateTerraform validate
● Think linting ++Think linting ++

17. Terraform planTerraform plan
● Will go out the $provider get the stateWill go out the $provider get the state
● Compare the state and will tell you if and whatCompare the state and will tell you if and what
will be changedwill be changed
● Be aware changes can be PATCH or DELETEBe aware changes can be PATCH or DELETE
and PUTand PUT

18. Terraform applyTerraform apply
● Where the sausage get made.Where the sausage get made.
● Will fail on error and will tell the operator to go fixWill fail on error and will tell the operator to go fix

19. Remote StateRemote State
datadata "terraform_remote_state""terraform_remote_state" "remote_state_mgmt""remote_state_mgmt" {{
backendbackend == "azure""azure"
configconfig {{
resource_group_nameresource_group_name == "euw1-mgmt-rg-deploy""euw1-mgmt-rg-deploy"
storage_account_namestorage_account_name == "euw1mgmtsadeploy""euw1mgmtsadeploy"
container_namecontainer_name == "euw1-mgmt-sc-remote-state""euw1-mgmt-sc-remote-state"
keykey == "mgmt.azure.tfstate""mgmt.azure.tfstate"
arm_subscription_idarm_subscription_id == "${var."${var.arm_subscription_idarm_subscription_id}"}"
arm_client_idarm_client_id == "${var."${var.arm_client_idarm_client_id}"}"
arm_client_secretarm_client_secret == "${var."${var.arm_client_secretarm_client_secret}"}"
arm_tenant_idarm_tenant_id == "${var."${var.arm_tenant_idarm_tenant_id}"}"
}}
}}

20. The other remote stateThe other remote state
outputoutput "forest_reverseproxy_public_ip""forest_reverseproxy_public_ip" {{
valuevalue == "${"${azurerm_public_ipazurerm_public_ip.forest_reverseproxy_public_ip..forest_reverseproxy_public_ip.ip_addressip_address}"}"
}}
resourceresource "azurerm_dns_a_record""azurerm_dns_a_record" "raet""raet" {{
namename == "raet""raet"
zone_namezone_name == "${data."${data.terraform_remote_stateterraform_remote_state..remote_state_mgmtremote_state_mgmt..esoptra_net_nameesoptra_net_name}"}"
resource_group_nameresource_group_name == "${data."${data.terraform_remote_stateterraform_remote_state..remote_state_mgmtremote_state_mgmt..euw1-glbldns-rg-nameeuw1-glbldns-rg-name}"}"
ttlttl == 300300
recordsrecords = [= ["${"${azurerm_public_ipazurerm_public_ip.forest_reverseproxy_public_ip..forest_reverseproxy_public_ip.ip_addressip_address}"}"]]
}}

21. importsimports
terraform import azurerm_dns_a_record.testterraform import azurerm_dns_a_record.test
/subscriptions/00000000-0000-0000-0000-/subscriptions/00000000-0000-0000-0000-
000000000000/resourceGroups/mygroup1/prov000000000000/resourceGroups/mygroup1/prov
iders/Microsoft.Network/dnsZones/zone1/A/myriders/Microsoft.Network/dnsZones/zone1/A/myr
ecord1ecord1

22. TestingTesting
ruby '2.3.1'ruby '2.3.1'
source 'https://rubygems.org/' dosource 'https://rubygems.org/' do
gem 'test-kitchen'gem 'test-kitchen'
gem 'kitchen-terraform'gem 'kitchen-terraform'
EndEnd
Kitchen {converge, verify,destroy}Kitchen {converge, verify,destroy}

23. cloud-initcloud-init
os_profileos_profile {{
computer_namecomputer_name == "${var."${var.environmentenvironment}${var.}${var.node_namenode_name}"}"
admin_usernameadmin_username == "${var."${var.vm_root_usernamevm_root_username}"}"
admin_passwordadmin_password == "${var."${var.vm_root_passwordvm_root_password}"}"
custom_datacustom_data == "${data."${data.template_filetemplate_file..bootstrap_shbootstrap_sh..renderedrendered}"}"
}}
#!/usr/bin/env bash#!/usr/bin/env bash
apt-get update && sudo apt-get dist-upgrade -yapt-get update && sudo apt-get dist-upgrade -y
apt-get install -y apt-transport-https lsb-release dirmngr ssmtpapt-get install -y apt-transport-https lsb-release dirmngr ssmtp
wget -O - https://raw.githubusercontent.com/petems/puppet-install-wget -O - https://raw.githubusercontent.com/petems/puppet-install-
shell/master/install_puppet_5_agent.sh | shshell/master/install_puppet_5_agent.sh | sh
cat << EOF > /etc/puppetlabs/puppet/csr_attributes.yamlcat << EOF > /etc/puppetlabs/puppet/csr_attributes.yaml
------
extension_requests:extension_requests:
pp_environment: ${environment}pp_environment: ${environment}
pp_network: ${network}pp_network: ${network}
pp_provisioner: terraformpp_provisioner: terraform
pp_region: ${region}pp_region: ${region}
pp_role: ${role}pp_role: ${role}
EOFEOF
echo "${puppetmaster_ip}echo "${puppetmaster_ip} ${puppetmaster_fqdn}" >> /etc/hosts${puppetmaster_fqdn}" >> /etc/hosts
/opt/puppetlabs/bin/puppet agent -t --environment=mgmt/opt/puppetlabs/bin/puppet agent -t --environment=mgmt

24. ContactContact
Bram VogelaarBram Vogelaar
+31 6 46 62 60 78+31 6 46 62 60 78
bram.vogelaar@inuits.eubram.vogelaar@inuits.eu
@attachmentgenie@attachmentgenie
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