March 2023 Summaries

Docker is a platform that enables the creation and running of containerized applications. Containers package source code, dependencies, and runtime environments into reusable units that can be deployed anywhere a container runtime is available. To create a Docker image for an application, a Dockerfile containing instructions for building the container image is used. These instructions include copying files from the host to the container, running commands within the container's filesystem, and setting metadata such as labels. Following best practices when writing Dockerfiles can improve usability, performance, and security of the resulting images.

This post provides a detailed guide on implementing CI/CD automation for Terraform IaC workflows using GitLab. The steps covered include setting up a GitLab project repository, creating the Terraform configuration files, setting up pipelines using .gitlab-ci.yml file, setting up AWS credentials in GitLab, configuring the backend in the provider block for local development, and implementing conditions to enable destroy operation using pipeline. The author also discusses how GitLab automatically configures the remote backend and provides a brief overview of Spacelift, an alternative tool specifically built for IaC automation workflow.

Terraform is an open-source Infrastructure as Code (IaC) tool developed by Hashicorp that enables users to provision infrastructure in a simple, efficient, and declarative manner through repeatable code. It has a cloud-agnostic nature, allowing deployment of infrastructure to any cloud environment or on-premises environments. Terraform's architecture consists of the Terraform Core, Providers, and State file. The workflow involves defining resources in configuration files, initializing the working directory, reviewing the execution plan, applying changes, and inspecting the state of infrastructure.

Tfenv is a version manager for Terraform inspired by rbenv, which enables users to install multiple versions of Terraform and switch between them easily. This can be useful when working on projects with different customers or ensuring backward compatibility. Tfenv can be installed on MacOS using Homebrew, Linux via the Arch User Repository (AUR), or manually on Windows Subsystem for Linux (WSL2). Users can install specific Terraform versions, set a default version, and view available options. The latest available version can also be conveniently installed. Tfenv is an open-source command line program that helps manage and switch between multiple versions of Terraform.

Spacelift is set to attend KubeCon + CloudNativeCon Europe in Amsterdam on April 18-21. As a silver sponsor of the event, they will have engineers at booth S89 ready to demonstrate their product. Attendees are encouraged to book meetings with Spacelift representatives during the conference.

Docker volumes provide persistent storage for containers and are managed by Docker independently from the containers themselves. They can be mounted to multiple containers simultaneously, remain accessible after the containers they're attached to have stopped, and can be centrally managed using the Docker CLI. Volumes should be used when a container requires permanent storage to save new or modified files. This is especially important for stateful applications like databases and file servers. Using volumes ensures that critical data persists even after a container failure or restart.

The text discusses the process of migrating from Terraform Cloud to Spacelift using a migration kit. It provides step-by-step instructions on how to export resources, generate configuration files, and create stacks in Spacelift. The author also highlights known limitations and post-migration cleanup tasks. Additionally, it emphasizes the benefits of using Spacelift for managing Terraform state and infrastructure.

The terraform console command allows users to experiment with Terraform functions and expressions in a quick and easy manner. It supports built-in functions for computing values within a configuration, such as references to data exported by resources, arithmetic, conditional evaluation, and more. The console can be used to test functions and expressions before modifying configuration files, and it also interacts with any values held in the local or remote state if a state file is available. To exit the console, users can hit Ctrl-C or Ctrl-D, or type "exit."

Spacelift, a CI/CD automation tool, offers Custom Inputs feature to integrate security tools in workflows. The integration involves three steps: installing the security tool, running it as part of a hook and saving its output to a json file, and accessing the data in a plan policy. Spacelift supports integrating with various security tools like Tfsec, Checkov, Terrascan, and Kics. These tools can be integrated using runner images or before_init hooks. Custom inputs provide flexibility as they can integrate with any JSON file, allowing users to create powerful policies based on their use case.

Spacelift has introduced Blueprints, a new feature designed to make it easier for non-advanced engineers and developers to deploy infrastructure to the cloud. Blueprints are templates that allow administrators to configure all defaults, guardrails, and other settings for infrastructure deployment. This self-service mechanism can be used by developers, managers, or other administrators. The feature is currently available for Spacelift Enterprise accounts.

This post discusses how to manage Terraform deployments and workflows using Jenkins. It covers the installation of the Terraform plugin on Jenkins, installing the Terraform binary, preparing the Terraform config, creating a Jenkins pipeline, configuring access to AWS, testing the pipeline, destroying infrastructure using Jenkins, and automatic triggering. The post also highlights some customization options for managing the Terraform workflow in Jenkins and mentions Spacelift as an alternative tool for managing infrastructure with Terraform.

ArgoCD is a popular tool for setting up continuous delivery with Kubernetes. It can monitor your source repositories and automatically deploy changes to your cluster. The GitOps model is integral to Argo’s design, making the repository the single source of truth for your application's desired state. Argo compares the declared state to what's actually running in your cluster, then applies the correct changes to resolve any discrepancies. This process can be configured to run automatically, preventing your cluster from drifting away from your repository. The tool comes with both a CLI and web UI, supports multi-tenant and multi-cluster environments, integrates with SSO providers, produces an audit trail, and can implement complex rollout strategies such as canary deployments and blue/green upgrades. It also offers integrated rollbacks so you can quickly recover from deployment failures.

Infrastructure as Code (IaC) tools like Terraform and Kubernetes can help manage cloud-based infrastructure at scale, but they also come with challenges such as a swelling codebase and potential security risks. To manage IaC effectively, consider using GitOps for centralized deployment mechanisms, choosing between monorepo or polyrepo strategies based on your organization's needs, implementing state management solutions like S3 and DynamoDB, adopting "barbell" security to balance responsibilities between developers and security teams, setting policies to reduce blast radius, utilizing modules and RBAC for access control, managing contexts and secret storage, and automating resource deployment processes.

The Cloud Development Kit for Terraform (CDKTF) is a tool that allows developers to use familiar programming languages like TypeScript, JavaScript, Python, and C# to define their Terraform infrastructure. This makes it easier to manage and maintain the infrastructure as developers can leverage their existing skills and tools. CDKTF provides an object-oriented approach to Terraform and supports integration with existing Terraform modules and plugins. It is particularly useful when working with teams of developers familiar with any of the supported languages who need to gain experience with Terraform. By using CDKTF, users can define infrastructure in a more understandable, readable, and composable way, making it easier for them to manage and maintain their environments over time.

Custom Resource Definitions (CRDs) in Kubernetes allow users to extend the base API with custom objects and enable management of other parts of infrastructure such as network devices. Commonly, CRDs are included with tool installations on a cluster. Creating a CRD involves defining a resource definition using YAML files. Once created, these custom objects can be managed by Kubernetes and used to create automation scripts through CustomController objects. Spacelift is an alternative CI/CD automation tool that helps manage complexities and compliance challenges of using Kubernetes.