content update

docs/Engineering/ConfigurationManagement.md

@@ -1,5 +1,15 @@
 # Configuration Management
+## Summary
 
 - Used for virtual machine OS-level configuration
-- Example: Configuring the internals of the VMs
-- Referring to package configuration & software maintenance
+- Ex: Configuring the internals of the VMs
+- Referring to package configuration & software maintenance
+## Tools
+
+- Puppet *(might be covered here later on)*
+- Ansible
+- Chef
+
+## OS Hardening
+
+ - [OVH Debian CIS OS Hardening helper](https://github.com/ovh/debian-cis/tree/master)

docs/Engineering/DRP.md

@@ -4,4 +4,5 @@
 
  - [C4 Model for software engineering](https://c4model.com)
  - [GCP Architecture diagram](https://googlecloudcheatsheet.withgoogle.com/architecture)
- - [GCP DRP guide](https://cloud.google.com/architecture/dr-scenarios-planning-guide)
+ - [GCP DRP guide](https://cloud.google.com/architecture/dr-scenarios-planning-guide)
+ - [Architecting disaster recovery for cloud infrastructure outages](https://cloud.google.com/architecture/disaster-recovery)

docs/Engineering/IaC.md

@@ -1,9 +1,10 @@
 # Infrastructure as Code
-
+## Summary
 - Used for provisioning and managing cloud resources
-- Example : Creating and provisioning a VM
+- Ex : Creating and provisioning a VM
 - Referring to all APIs used to deploy infrastructure
-
 - Declarative statements : the yaml configuration is a picture of the desired stage. Unlike CLI commands which are imperative and tells what to do : We can focus on how the infrastructure should be.
 
-Popular solution : Hashicorp Terraform, which is multi API / multi-cloud with an open-source core.
+## Tools
+
+- [Hashicorp Terraform](https://www.terraform.io/), which is multi API / multi-cloud with an open-source core.