qe-sap-deployment

This project aims to provide automation that will create highly-available SAP deployment to aide cluster testing.

This project is in a very early stage of development.

Prerequisite

Tools needed

• Python >= 3.10
• terraform v1.5.7
• ansible-core 2.16.8 : please refer to the requirements.txt file
• cloud provider cli tools (az, aws, gcloud)

The Python requirements could be managed with a virtual environment

python3 -m venv venv
source venv/bin/activate
pip install -r requirements.txt

Ansible dependency are managed separately. After the installation of the Ansible core the following command has to be executed:

ansible-galaxy install -r requirements.yml

Prepare a ssh key pair

cd <SECRET_FOLDER>
ssh-keygen -f id_rsa_cloud -t rsa -b 4096 -N
ssh-add id_rsa_cloud

Usage

Qesap driven deployment

This project provides a script in scripts/qesap/qesap.py to drive the deployment, attempting to hide the complexity of the underlying Terraform and Ansible scripts and commands.

Configuration file

To get started, the user must create a yaml configuration file

cp config.yaml.example config.yaml

Edit the values of config.yaml:

Run the config step to get all the needed Terraform and Ansible configuration files generated.

(venv) python3 scripts/qesap/qesap.py --verbose -c config.yaml -b <FOLDER_OF_YOUR_CLONED_REPO> configure

Generic settings

Two main global settings are:

• provider : refer to the cloud provider name. Has to be one of the folder names in terraform/
• apiver : refer to the config.yaml format. Qesap.py could use this number to attempt some behavioral adaptation.

Terraform settings

The main section is terraform::variables. All the fields there are translated in the terraform.tfvar. For example

provider: azure
apiver: 3
terraform:
    variables:
        deploy_name: something
        region: europe

result in a terraform/azure/terraform.tfvars generated file like:

deploy_name = "something"
region = "europe"

To mitigate code duplication in the terraform section across multiple different conf.yaml, the user can use so called Terraform tfvars templates.

The used can create a file like /home/user/terraform.template.tfvars that is expected to use same syntax of tfvar files.

User has to refer to it with tfvars_template setting in the conf.yaml

provider: azure
apiver: 3
terraform:
    tfvars_template: /home/user/terraform.template.tfvars

The generated terraform.tfvars file will get values from the template.

If the conf.yaml also have a terraform::variables section, values from that will be used too. In case of collision with setting in both the conf.yaml and in the template, values from the conf.yaml will win.

By default the deployment will use whatever terraform binary is available on the system. It is possible to specify a custom binary using terraform:bin key:

provider: azure
apiver: 3
terraform:
    bin: /home/user/bin/version000/terraform

Ansible settings

The Ansible playbooks needs some .yaml configuration files. Some of them are generated by Terraform, some of them has to be provided by the user. The qesap.py configure command can support the user to create them.

Hana variables

The Ansible project requires a configuration file ansible/playbooks/vars/hana_vars.yaml. This file is generated from the ansible::hana_vars section of the config.yaml. All the content of the hana_vars config.yaml section is directly written in the hana_vars.yaml:

provider: azure
apiver: 3
ansible:
  hana_vars:
    sap_hana_install_software_directory: /hana/shared/install
    sap_hana_install_master_password: 'SomeSecret'
    sap_hana_install_sid: 'HDB'
    sap_hana_install_instance_number: '00'
    sap_domain: "qe-test.example.com"
    primary_site: 'goofy'
    secondary_site: 'miky'

Required fields in this section are documented in the qe-sap-deployment ansible documentation.

Hana media

The Ansible project is provided with a playbook sap-hana-download-media.yaml to get the Hana installers. This playbook is configured using an Ansible variables file named hana_media.yaml. The qesap.py script can assit the user to generate it as part of configure step. Exactly these fields of the conf.yaml are needed to generate the hana_media.yaml file.

ansible:
  az_storage_account_name: "something"
  az_container_name:  "somewhere"
  az_sas_token: "secret***token"
  hana_media:
    - "SOMETHING.EXE"
    - "SOMETIME.SAR"
    - "SOMEWHERE.SAR"

Refer to the qe-sap-deployment Ansible documentation or ansible/playbooks/vars/hana_media.example.yaml for more details about these settings.

Playbooks sequence

The qesap.py ... ansible sub-command calls a sequence of playbooks execution. The sequence has to be defined in the ansible::create section of the config.yaml. The ansible::destroy sequence is used by qesap.py ... ansible -d

ansible:
  create:
    - registration.yaml -e reg_code=******* -e [email protected]
    - pre-cluster.yaml
    - sap-hana-preconfigure.yaml -e use_sapconf=true
    - cluster_sbd_prep.yaml
    - sap-hana-storage.yaml
    - sap-hana-download-media.yaml
    - sap-hana-install.yaml
    - sap-hana-system-replication.yaml
    - sap-hana-system-replication-hooks.yaml
    - sap-hana-cluster.yaml
  destroy:
    - deregister.yaml

• In case of Azure deployment using native fencing, there are additional parameters to be added for sap-hana-cluster.yaml playbook.
• For details please check ./docs/playbooks/README.md

Deploy

Terraform and Ansible deployment steps can be executed like:

(venv) python3 scripts/qesap/qesap.py --verbose -c config.yaml -b <FOLDER_OF_YOUR_CLONED_REPO> terraform

(venv) python3 scripts/qesap/qesap.py --verbose -c config.yaml -b <FOLDER_OF_YOUR_CLONED_REPO> ansible

The terraform sub command has a partial support for Terraform workspace

(venv) python3 scripts/qesap/qesap.py --verbose -c config.yaml -b <FOLDER_OF_YOUR_CLONED_REPO> terraform -w my_workspace

Destroy

The destruction of the infrastructure, including the de-registration of SLES, can be conducted with:

(venv) python3 scripts/qesap/qesap.py --verbose -c config.yaml -b <FOLDER_OF_YOUR_CLONED_REPO> ansible -d

(venv) python3 scripts/qesap/qesap.py --verbose -c config.yaml -b <FOLDER_OF_YOUR_CLONED_REPO> terraform -d

Manual deployment

It is possible to use the deployment, without using the qesap.py script. A possible way to get the proper sequence of terraform and ansible commands to run, is obtaining them from qesap.py using the --dryrun mode.

Here is an example of a sequence of Terraform commands to obtain the Azure deployment

cd terraform/azure
TF_LOG_PATH=terraform.plan.log TF_LOG=INFO terraform plan -out=plan.zip
TF_LOG_PATH=terraform.apply.log TF_LOG=INFO terraform apply -auto-approve plan.zip

Terraform also generate the Ansible inventory file inventory.yaml

Test the inventory by pinging all hosts

ansible -i inventory.yaml all -m ping --ssh-extra-args="-o UpdateHostKeys=yes -o StrictHostKeyChecking=accept-new -i <SECRET_FOLDER>/id_rsa_cloud" -u cloudadmin

Destroy the deployed infrastructure

cd terraform/azure
TF_LOG_PATH=terraform.destroy.log TF_LOG=INFO terraform destroy

Run deployment in a container

Dockerfile provided to keep track of right version of all needed. It need to be build once:

podman pull opensuse/tumbleweed:latest
podman build -t my-tag .

The image expect this repository code to be mount in /src

Cloud provider account can be managed:

• from within the image (e.g running az login from within the image)
• share already existing sessions by mounting proper folders -v ~/.aws:/root/.aws -v ~/.azure:/root/.azure -v ~/.config/gcloud:/root/.config/gcloud

Existing ssh keys has to be mounted -v $(pwd)/secret:/root/.ssh

The image can be used interactively

cd <THIS_REPO_FOLDER>
podman run -it -v .:/src -v ~/.azure:/root/.azure -v $(pwd)/secret:/root/.ssh

Or to execute a specific action:

cd <THIS_REPO_FOLDER>
podman run -it \
    -v .:/src -v ~/.azure:/root/.azure -v $(pwd)/secret:/root/.ssh my-tag \
    python3 /src/scripts/qesap/qesap.py --verbose -c config.yaml -b /src terraform
    python3 /src/scripts/qesap/qesap.py --verbose -c config.yaml -b /src ansible

Using roles from a different repo

To use roles located in a different repository manually, just copy the desired role directory in ansible/roles, and call it from a playbook within the roles: section. An example of how to fetch and use a role can be found in ansible/playbooks/registration_role.

If the user does not wish to copy the role in the roles folder of this repository, it is possible by adding the directory inside which the desired role is located in the environmental variable $ANSIBLE_ROLES_PATH before running the deployment.

export ANSIBLE_ROLES_PATH=<the-dir-where-the-role-is-located>
. . . (run deployment as you would normally do)