Terraform CDK Create OCI OracleCloudInfraStructure VM
2021-09-20T23:40:41+01:00
Introduction
We will be using terraform-cdk toolkit in this article. We shall be using an OCI (Oracle Cloud Infrastructure) account to spin up a VM.
We shall be doing following.
Manual steps to prepare cloud environment first (using oci-cli)
- Create a new user account cdk-user (apart from the tenancy admin) and new compartment called as CDK for this user.
- cdk-user will have full privleges to CDK compartment.
- This is done as per Oracle recommended practices for OCI.
Steps performed by terraform CDK.
- Create a brand new VCN in CDK compartment.
- Create 1 public subnet.
- A key-pair for ssh
- An internet-gateway in this VCN (It is needed to get bi-directional internet connectity to new VCN.)
- A new VM created in above mentioned VCN, and public subnet having internet connectivity and allows ssh connection from internet.
Note1: We shall be using python for terraform-cdk.
Prepare OCI environment
- You need an OCI account. Its free. SignUp at https://cloud.oracle.com. This sign-up account is called Tenancy Admin account.
- Login to this Tenancy Admin account. Make sure you have selected Oracle Cloud Infrastructure Direct Sign-In option on the login page.
- click hamburger icon on the top-left corner
- click Identity & Security
- click users
- click your email ID here (the one you used for sign-up)
- click API Keys
- click Add API Key
- select Generate API Key Pair
- click Download private key
- click Add button
- Copy the content in Configuration File Preview and save it. We need it later on.
- click close
Prepare local development environment
We shall be doing everything in a docker image. I am using fedora-34.
Start fedora-34 in interactive mode.
$ docker run -it fedora:34 /bin/bash
Unable to find image 'fedora:34' locally
34: Pulling from library/fedora
b9705287bb9f: Pull complete
Digest: sha256:d18bc88f640bc3e88bbfacaff698c3e1e83cae649019657a3880881f2549a1d0
Status: Downloaded newer image for fedora:34
[root@248b335b1e23 /]#Install NVM (node version manager) inside docker container.
[root@248b335b1e23 /]# curl https://raw.githubusercontent.com/creationix/nvm/master/install.sh | bash
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 14984 100 14984 0 0 43057 0 --:--:-- --:--:-- --:--:-- 43057
=> Downloading nvm as script to '/root/.nvm'
=> Appending nvm source string to /root/.bashrc
=> Appending bash_completion source string to /root/.bashrc
=> Close and reopen your terminal to start using nvm or run the following to use it now:
export NVM_DIR="$HOME/.nvm"
[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh" # This loads nvm
[ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion" # This loads nvm bash_completion
[root@248b335b1e23 /]#Enable NVM in current shell
[root@248b335b1e23 /]# source /root/.bashrcInstall latest stable node.
[root@248b335b1e23 /]# nvm install --lts
Installing latest LTS version.
Downloading and installing node v14.17.6...
Downloading https://nodejs.org/dist/v14.17.6/node-v14.17.6-linux-x64.tar.gz...
################################################################################################################################################################################################## 100.0%
Computing checksum with sha256sum
Checksums matched!
Now using node v14.17.6 (npm v6.14.15)
Creating default alias: default -> lts/* (-> v14.17.6 *)
[root@248b335b1e23 /]#Install VIM, unzip, less
[root@248b335b1e23 /]# dnf install vim unzip less openssh-clients jq openssl -yInstall oci-cli
[root@248b335b1e23 /]# dnf install python -y
[root@248b335b1e23 /]# pip install oci-cliConfigure Tenancy Admin account to access OCI via APIs
You can run oci setup config command to setup the oci config. But we will be following direct manual method as we already have config saved in previous step when we prepared the oci envrionment.
[root@248b335b1e23 /]# mkdir ~/.oci
[root@248b335b1e23 /]# chmod g-rwx,o-rwx /root/.oci
[root@248b335b1e23 /]# ls -ld /root/.oci/
drwx------ 2 root root 4096 Sep 20 23:36 /root/.oci/
[root@248b335b1e23 /]# touch ~/.oci/tenancyAdmin_private_api_key.pem
[root@248b335b1e23 /]# vim ~/.oci/tenancyAdmin_private_api_key.pemPaste the contents from file that you downloaded during the step download private key above in file ~/.oci/tenancyAdmin_private_api_key.pem
[root@248b335b1e23 /]# chmod 600 ~/.oci/tenancyAdmin_private_api_key.pem
[root@248b335b1e23 /]# touch ~/.oci/config
[root@248b335b1e23 /]# chmod 600 ~/.oci/config
[root@248b335b1e23 /]# vim ~/.oci/configPaste the contents from file that you saved during the step Configuration file preview above in file ~/.oci/config
Contents of ~/.oci/config will be similar to the following.
[DEFAULT]
user=ocid1.user.oc1..<a very long string>
fingerprint=xx:yy:11:22:33:44:d4:56:b6:67:89:b7:b1:7f:4f:7a
tenancy=ocid1.tenancy.oc1..<a very long string>
region=uk-london-1
key_file=~/.oci/tenancyAdmin_private_api_key.pemPlease note key_file= above. You need to have exactly the same entry as above.
Verify connectivity to OCI
[root@248b335b1e23 /]# oci iam user listAbove command must run successfully.
Create and setup cdk-user
We will be creating a new user cdk-user and new compartment CDK, where this user can manage anything. Following are the manual steps. But there is a script setup_oci_user_account.sh as well in git repo that can also do the same. Link to the git repo is mentioned at the bottom of this article.
Get reuired info in variables.
[root@248b335b1e23 /]# export tenancyID=$(cat ~/.oci/config | egrep '^tenancy' | awk -F"=" '{print $2}')
[root@248b335b1e23 /]# export rootCompartmentID=$tenancyID
[root@248b335b1e23 /]# export tenancyRegion=$(cat ~/.oci/config | egrep region | awk -F"=" '{print $2}')Note: Root compartmentID is same as TenancyID
Create CDK compartment
[root@248b335b1e23 /]# oci iam compartment create --name CDK --compartment-id $rootCompartmentID --description "CDK Compartment"Take a note of CDK compartment id from above output.
Create cdk-user
[root@248b335b1e23 /]# oci iam user create --name cdk-user --compartment-id $rootCompartmentID --description "cdk user"Create cdk-group
[root@248b335b1e23 /]# oci iam group create --name cdk-group --compartment-id $rootCompartmentID --description "cdk group"Add cdk-user to cdk-group
[root@248b335b1e23 /]# export cdk_user_ocid=$(oci iam user list --name cdk-user | jq -r '.data[0].id')
[root@248b335b1e23 /]# export cdk_group_ocid=$(oci iam group list --name cdk-group | jq -r '.data[0].id')
[root@248b335b1e23 /]# oci iam group add-user --user-id $cdk_user_ocid --group-id $cdk_group_ocidAllow cdk-group to do anything in compartment CDK
[root@248b335b1e23 /]# export CDKcompartmentID=$(oci iam compartment list --compartment-id $rootCompartmentID --lifecycle-state ACTIVE | jq -r '.data[] | select(.name == "CDK") | .id')
[root@248b335b1e23 /]# oci iam policy create --name "CDK_Policies" --compartment-id $CDKcompartmentID --description "Policies for CDK" --statements '["Allow group cdk-group to manage all-resources in compartment CDK"]'Generate API keys for cdk-user
[root@248b335b1e23 /]# cd ~/.oci/
[root@248b335b1e23 .oci]# openssl genrsa -out cdk-user_private_api_key.pem 2048
[root@248b335b1e23 .oci]# openssl rsa -pubout -in cdk-user_private_api_key.pem -out cdk-user_public_api_key.pem
[root@248b335b1e23 .oci]# chmod go-rwx cdk-user_private_api_key.pemUpload public key for cdk-user
[root@248b335b1e23 .oci]# oci iam user api-key upload --user-id $cdk_user_ocid --key-file ~/.oci/cdk-user_public_api_key.pempreapre cdk-user profile in ~/.oci/config file
[root@248b335b1e23 .oci]# export cdk_user_fingerprint=$(openssl rsa -pubout -outform DER -in ~/.oci/cdk-user_private_api_key.pem 2> /dev/null | openssl md5 -c | awk '{print $2}')
[root@248b335b1e23 .oci]# cat <<HELLO >> ~/.oci/config
[cdk-user]
user=$cdk_user_ocid
fingerprint=$cdk_user_fingerprint
tenancy=$tenancyID
region=$tenancyRegion
key_file=~/.oci/cdk-user_private_api_key.pem
HELLOA new section has been appened to ~/.oci/config file
verify cdk-user access
[root@248b335b1e23 .oci]# oci iam user get --user-id=$cdk_user_ocid --profile cdk-userNote: --profile cdk-user in above command
Install tools required for development
Install terraform binary
[root@248b335b1e23 /]# dnf install -y dnf-plugins-core
[root@248b335b1e23 /]# dnf config-manager --add-repo https://rpm.releases.hashicorp.com/fedora/hashicorp.repo
[root@248b335b1e23 /]# dnf -y install terraformInstall terraform-cdk kit
[root@248b335b1e23 /]# npm install --global cdktf-cli
[root@248b335b1e23 /]# cdktf --version
0.6.2Install pipenv
[root@248b335b1e23 /]# pip install pipenvpipenv is better than pip. It is similar to nodejs npm i.e keeps a lockfile as well as packages file in working directory. cdktf-cli can use both pip and pipenv, but we will be using pipenv mode.
Start coding.
Create a project with python template
[root@248b335b1e23 ~]# mkdir ~/oci_terraform_cdk_python
[root@248b335b1e23 ~]# cd ~/oci_terraform_cdk_python/
[root@248b335b1e23 oci_terraform_cdk_python]# cdktf init --template="python" --local
Note: By supplying '--local' option you have chosen local storage mode for storing the state of your stack.
This means that your Terraform state file will be stored locally on disk in a file 'terraform.<STACK NAME>.tfstate' in the root of your project.
? projectName: oci_terraform_cdk_python
? projectDescription: A public VM in OCIInstall OCI sdk and other required libraries
[root@248b335b1e23 oci_terraform_cdk_python]# pipenv install pycryptodome ociFiles in current direcotry
[root@248b335b1e23 oci_terraform_cdk_python]# ls -a
. .. .gitignore Pipfile Pipfile.lock cdktf.json help main.pyDownload OCI terraform modules libraries
Add terraform provider information in cdktf.json file
{
"language": "python",
"app": "pipenv run python main.py",
"projectId": "ae857ab0-8c78-424b-97cf-aeb5f3b56d63",
"terraformProviders": [
"oci@~> 4.44.0"
],
"terraformModules": [],
"codeMakerOutput": "imports",
"context": {
"excludeStackIdFromLogicalIds": "true",
"allowSepCharsInLogicalIds": "true"
}
}Get the OCI terraform libraries
[root@248b335b1e23 oci_terraform_cdk_python]# cdktf get
[root@248b335b1e23 oci_terraform_cdk_python]# ls
Pipfile Pipfile.lock account.py cdktf.json help imports main.pyCreate a helper library account.py with following contents
[root@248b335b1e23 oci_terraform_cdk_python]# touch account.pyaccount.py contents
#! /usr/bin/env python
import oci
from Crypto.PublicKey import RSA
import os
keys_dir = "keys"
profile_name = "cdk-user"
compartment_name = "CDK"
config = oci.config.from_file("~/.oci/config", profile_name)
identity = oci.identity.IdentityClient(config)
user = identity.get_user(config["user"]).data
compartment_id = user.compartment_id
# compartments = identity.list_compartments(compartment_id, compartment_id_in_subtree=True, lifecycle_state="ACTIVE", access_level="ACCESSIBLE")
# print(compartments.data)
# print(compartments.data[0])
def get_availability_domain():
list_availability_domains_response = oci.pagination.list_call_get_all_results(
identity.list_availability_domains,
compartment_id
)
availability_domain = list_availability_domains_response.data[0]
return availability_domain.name
def get_compartment_id(comp_name=compartment_name) -> str:
desired_compartment_id: str = ""
for comp in oci.pagination.list_call_get_all_results_generator(
identity.list_compartments,
'record',
compartment_id,
compartment_id_in_subtree=True,
lifecycle_state="ACTIVE"):
if comp.name == comp_name:
desired_compartment_id = comp.id
return desired_compartment_id
def generate_key_pair():
os.mkdir("keys")
key = RSA.generate(2048)
private_key = key.export_key("PEM")
file_out = open(f"{keys_dir}/private.pem", "wb")
file_out.write(private_key)
file_out.close()
os.chmod(f"{keys_dir}/private.pem", 0o600)
public_key = key.publickey().export_key("OpenSSH")
file_out = open(f"{keys_dir}/public.pem", "wb")
file_out.write(public_key)
file_out.close()
return public_key.decode("utf-8")
def get_key_pair(use_existing_keys=True):
if use_existing_keys:
if not os.path.isfile(f"{keys_dir}/private.pem"):
return generate_key_pair()
else:
with open(f"{keys_dir}/public.pem", 'rb') as f:
public_key = f.read()
return public_key.decode("utf-8")
else:
return generate_key_pair()
if __name__ == '__main__':
print(f"desired_compartment_id = {get_compartment_id()}")
print(f"availability_domain = {get_availability_domain()}")
print(get_key_pair())update main.py with following contents
main.py contents
#!/usr/bin/env python
from constructs import Construct
from cdktf import App, TerraformOutput, TerraformStack
from imports.oci import (CoreDhcpOptionsOptions,
CoreRouteTableRouteRules,
CoreVcn,
OciProvider,
CoreInstance,
CoreSubnet,
CoreDhcpOptions,
CoreDhcpOptionsOptions,
CoreInstanceCreateVnicDetails,
CoreInternetGateway,
CoreRouteTable,
CoreRouteTableAttachment,
)
from account import get_compartment_id, get_availability_domain, get_key_pair, compartment_name, profile_name
class MyStack(TerraformStack):
def __init__(self, scope: Construct, ns: str):
super().__init__(scope, ns)
desired_compartment_id: str = get_compartment_id(comp_name=compartment_name)
desired_availability_domain = get_availability_domain()
desired_image_id = "ocid1.image.oc1.uk-london-1.aaaaaaaa7p27563e2wyhmn533gp7g3wbohrhjacsy3r5rpujyr6n6atqppuq"
public_key = get_key_pair()
# define resources here
OciProvider(self, "oci",
config_file_profile=profile_name)
vcn = CoreVcn(self, "OCI_VCN",
cidr_block="10.0.0.0/16",
display_name="OCI_VCN",
compartment_id=desired_compartment_id)
dhcp_options = CoreDhcpOptions(self, "DHCP_OPTIONS",
compartment_id=desired_compartment_id,
vcn_id=vcn.id,
options=[
CoreDhcpOptionsOptions(
type="DomainNameServer",
server_type="VcnLocalPlusInternet")
]
)
public_subnet = CoreSubnet(self, "PUBLIC_SUBNET",
cidr_block="10.0.0.0/24",
vcn_id=vcn.id,
compartment_id=desired_compartment_id,
display_name="public_subnet",
dhcp_options_id=dhcp_options.id)
internet_gateway = CoreInternetGateway(self, "INTERNET_GATEWAY",
compartment_id=desired_compartment_id,
vcn_id=vcn.id)
route_table = CoreRouteTable(self, "ROUTE_TABLE",
compartment_id=desired_compartment_id,
vcn_id=vcn.id,
route_rules=[
CoreRouteTableRouteRules(
network_entity_id=internet_gateway.id,
destination="0.0.0.0/0"
)
])
CoreRouteTableAttachment(self, "ROUTE_ATTACHMENT",
subnet_id=public_subnet.id,
route_table_id=route_table.id)
vm = CoreInstance(self, "VM_INSTANCE",
compartment_id=desired_compartment_id,
shape="VM.Standard.E2.1.Micro",
availability_domain=desired_availability_domain,
image=desired_image_id,
create_vnic_details=[
CoreInstanceCreateVnicDetails(
subnet_id=public_subnet.id)
],
metadata={
"ssh_authorized_keys": public_key
})
TerraformOutput(self, "vcn",
value=vcn.cidr_block)
TerraformOutput(self, "public_subnet",
value=public_subnet.cidr_block )
TerraformOutput(self, "vm_public_ip",
value=vm.public_ip)
app = App()
MyStack(app, "oci_terraform_cdk_python")
app.synth()NOTE: desired_image_id in above script was obtained from https://docs.oracle.com/en-us/iaas/images/image/33995e8a-13e8-4ebe-8a27-8beae9e57043/
[root@248b335b1e23 oci_terraform_cdk_python]# ls
Pipfile Pipfile.lock account.py cdktf.json help imports main.pycheck what will be deployed
[root@248b335b1e23 oci_terraform_cdk_python]# cdktf diff
Stack: oci_terraform_cdk_python
Resources
+ OCI_CORE_DHCP_OPTION dhcp oci_core_dhcp_options.dhcp
S
+ OCI_CORE_INSTANCE instance oci_core_instance.instance
+ OCI_CORE_INTERNET_GA InternetGateway oci_core_internet_gateway.InternetGatew
TEWAY ay
+ OCI_CORE_ROUTE_TABLE route_table oci_core_route_table.route_table
+ OCI_CORE_ROUTE_TABLE RouteAttachment oci_core_route_table_attachment.RouteAt
_ATTACHMENT tachment
+ OCI_CORE_SUBNET public_subnet oci_core_subnet.public_subnet
+ OCI_CORE_VCN OCI_VCN oci_core_vcn.OCI_VCN
Diff: 7 to create, 0 to update, 0 to delete.deploy to OCI
[root@248b335b1e23 oci_terraform_cdk_python]# cdktf deploy --auto-approve
Deploying Stack: oci_terraform_cdk_python
Resources
✔ OCI_CORE_DHCP_OPTION dhcp oci_core_dhcp_options.dhcp
S
✔ OCI_CORE_INSTANCE instance oci_core_instance.instance
✔ OCI_CORE_INTERNET_GA InternetGateway oci_core_internet_gateway.InternetGatew
TEWAY ay
✔ OCI_CORE_ROUTE_TABLE route_table oci_core_route_table.route_table
✔ OCI_CORE_ROUTE_TABLE RouteAttachment oci_core_route_table_attachment.RouteAt
_ATTACHMENT tachment
✔ OCI_CORE_SUBNET public_subnet oci_core_subnet.public_subnet
✔ OCI_CORE_VCN OCI_VCN oci_core_vcn.OCI_VCN
Summary: 7 created, 0 updated, 0 destroyed.
Output: VM_public_ip = 150.230.119.194
publicSubnet = 10.0.0.0/24
vcn = 10.0.0.0/16
[root@248b335b1e23 oci_terraform_cdk_python]#Note: The public IP of the VM is there in above output.
Verify deployment by doing ssh into the VM
[root@248b335b1e23 oci_terraform_cdk_python]# ssh -i keys/private.pem opc@150.230.119.194
The authenticity of host '150.230.119.194 (150.230.119.194)' can't be established.
ED25519 key fingerprint is SHA256:5UKRn4VrJLhgkK40WaNmW7O0jgdAAsRE+1vNzDwFbAQ.
This key is not known by any other names
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added '150.230.119.194' (ED25519) to the list of known hosts.
[opc@instance20210921093338 ~]$ uptime
09:35:49 up 1 min, 1 user, load average: 0.70, 0.25, 0.09
[opc@instance20210921093338 ~]$Verify the idempotency
[root@248b335b1e23 oci_terraform_cdk_python]# cdktf deploy --auto-approve
No changes for Stack: oci_terraform_cdk_pythonDestroy the deployment
[root@248b335b1e23 oci_terraform_cdk_python]# cdktf destroy --auto-approve
Destroying Stack: oci_terraform_cdk_python
Resources
✔ OCI_CORE_DHCP_OPTION dhcp oci_core_dhcp_options.dhcp
S
✔ OCI_CORE_INSTANCE instance oci_core_instance.instance
✔ OCI_CORE_INTERNET_GA InternetGateway oci_core_internet_gateway.InternetGatew
TEWAY ay
✔ OCI_CORE_ROUTE_TABLE route_table oci_core_route_table.route_table
✔ OCI_CORE_ROUTE_TABLE RouteAttachment oci_core_route_table_attachment.RouteAt
_ATTACHMENT tachment
✔ OCI_CORE_SUBNET public_subnet oci_core_subnet.public_subnet
✔ OCI_CORE_VCN OCI_VCN oci_core_vcn.OCI_VCN
Summary: 7 destroyed.Repo link
https://github.com/spareslant/oci_terraform_cdk_python.git
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