DevOps Development Container

A comprehensive development container for DevOps and Infrastructure-as-Code workflows, built on Ubuntu 24.04 with essential tools for cloud infrastructure management, container orchestration, and automation.

🚀 Features

This devcontainer includes pre-configured tools for:

• Infrastructure as Code: Terraform, Terragrunt, tflint, tf-summarize, checkov
• Cloud Management: Azure CLI (az), AzCopy
• Container Operations: Docker Engine, Helm, kubectl, kubelogin
• Configuration Management: Ansible with 9 popular collections
• Scripting & Automation: PowerShell 7 with modules, Python with DevOps tools, uv, Node.js, ZSH with Oh My Zsh
• .NET Development: .NET 10 SDK (LTS) with C# and C# Dev Kit extensions
• AI Tooling: Claude Code, Codex, cswap (Claude Code account switcher)
• Security: git-crypt, gitleaks, checkov, optional custom CA trust chain
• Development Utilities: Custom bash/zsh aliases, shell completions, pre-commit
• Data Processing: jq, yq

📋 Included Tools

Tool	Purpose
Terraform	Infrastructure provisioning
Terragrunt	Terraform wrapper for DRY configurations
tflint	Terraform linting
tf-summarize	Human-readable Terraform plan summaries
checkov	IaC security and compliance scanning
Azure CLI	Azure cloud management
AzCopy	Bulk transfer to/from Azure Storage
Docker	Container runtime and management
Helm	Kubernetes package manager
kubectl	Kubernetes cluster management
kubelogin	Azure AD authentication for kubectl
Ansible	Configuration management and automation
PowerShell	Cross-platform automation and scripting
Python	Scripting with DevOps-focused packages
uv	Fast Python package/project manager (uv, uvx)
Node.js	JavaScript runtime and npm tooling
.NET SDK	C# / .NET 10 application development
Claude Code	Anthropic coding agent (self-updating, user-tree install)
Codex	OpenAI coding agent (run codex-init to configure)
cswap	Switch between Claude Code accounts (claude-swap)
git-crypt	Transparent encryption of files in git
gitleaks	Secret scanning
pre-commit	Git hook framework
jq / yq	JSON and YAML processing

jq, zsh and the other base utilities come from the apt package list and the upstream devcontainer base image rather than a dedicated install-*.sh script — which is why they have no entry in the install/ tree above.

uv is available for interactive use, but no tool in this image is installed through it — the Python-based tools (checkov, claude-swap, ansible) still use system-wide pip.

🏗️ Repository Structure

devcontainer-devops/
├── .github/
│   └── workflows/
│       ├── build.yml           # Reusable build: lint, build, test, scan, publish
│       ├── ci.yml              # Pull requests and pushes to main
│       └── release.yml         # Weekly CalVer release
├── .devcontainer/
│   ├── Dockerfile              # Multi-stage container build
│   ├── devcontainer.json       # VS Code devcontainer configuration
│   └── files/
│       ├── install/            # Installation scripts (each uses /tmp/install-<tool>)
│       │   ├── _arch.sh        # Sourced helper: architecture detection
│       │   ├── install-ansible.sh
│       │   ├── install-azcopy.sh
│       │   ├── install-azure-cli.sh
│       │   ├── install-checkov.sh
│       │   ├── install-claude-code.sh
│       │   ├── install-codex.sh
│       │   ├── install-cswap.sh
│       │   ├── install-docker.sh
│       │   ├── install-dotnet.sh
│       │   ├── install-git-crypt.sh
│       │   ├── install-gitleaks.sh
│       │   ├── install-helm.sh
│       │   ├── install-kubectl.sh
│       │   ├── install-kubelogin.sh
│       │   ├── install-node.sh
│       │   ├── install-powershell.sh
│       │   ├── install-pre-commit.sh
│       │   ├── install-python-tools.sh
│       │   ├── install-terraform.sh
│       │   ├── install-terragrunt.sh
│       │   ├── install-tf-summarize.sh
│       │   ├── install-tflint.sh
│       │   ├── install-uv.sh
│       │   └── install-yq.sh
│       ├── certs/              # Drop-in dir for extra CA certificates
│       │   └── README.md       # How to add your own CA chain
│       ├── codex/              # Codex bootstrap (rendered by `codex-init`)
│       │   ├── codex-init
│       │   └── config.toml.tmpl
│       ├── home/               # Home directory files
│       │   ├── .bash_aliases   # Convenience aliases
│       │   ├── .environment    # Shell-aware environment config
│       │   ├── .zshrc          # ZSH configuration
│       │   ├── .claude/        # Claude Code defaults
│       │   └── .config/        # PowerShell profile and theme
│       └── entrypoint.sh       # Container entrypoint for home dir init
├── tests/
│   ├── integration-test.sh     # Integration tests
│   ├── run-all-tests.sh        # Test runner
│   └── validate-tools.sh       # Tool validation
├── scripts/
│   └── check-latest-versions.sh
├── .hadolint.yaml              # Dockerfile lint rules, shared by CI and pre-commit
├── ARCHITECTURE.md             # System architecture documentation
├── CHANGELOG.md                # Version history
├── CONTRIBUTING.md             # Contribution guidelines
├── QUICKSTART.md               # Quick start guide
├── README.md                   # This file
├── SECURITY.md                 # Security policies
└── VERSION_MANAGEMENT.md       # Version management guide

🔧 Getting Started

Prerequisites

• Visual Studio Code
• Docker Desktop
• Dev Containers extension

Quick Start

1. Clone the repository:

   git clone https://github.com/dbhq-uk/devcontainer-devops.git
   cd devcontainer-devops

2. Open in VS Code:

   code .

3. Reopen in Container:

   • Press F1 or Ctrl+Shift+P
   • Select Dev Containers: Reopen in Container
   • The pre-built image is pulled from GHCR, so there is no wait for a build

4. Start developing! The container will be ready with all tools pre-installed.

Using the image directly

You do not need this repository to use the container. Point any devcontainer.json at the published image, or pull it yourself:

docker pull ghcr.io/dbhq-uk/devcontainer-devops:latest

Tag	What it is
latest	The most recent weekly release
2026.08.09	A specific weekly release
2026.08	The most recent release in that month
main	Head of the default branch, rebuilt on every push
sha-abc1234	One specific commit

Images are published for linux/amd64 and linux/arm64; Docker picks the right one automatically.

💾 Storage Configuration

The devcontainer uses Docker volumes for persistent storage:

• Workspace Volume: dev-workspace-<user> mounted at /workspace
• Home Volume: dev-home-<user> mounted at /home/vscode
• Bind Mount: The local workspace folder mounted at /workspace/devcontainer
• Permissions: Automatically configured via postCreateCommand
• Home Init: Entrypoint script copies default configs on first run

This ensures your work and settings persist across container rebuilds.

Both volumes are per-user (suffixed with $USER), so several checkouts can run side by side without sharing state. Note that /home/vscode is only seeded from the image's /tmp-home template on first start — tools installed into the home tree do not refresh on rebuild for an existing volume, which is why most tooling installs system-wide.

🔐 Custom CA Certificates

If your environment terminates TLS with a private CA, drop the PEM-encoded chain into .devcontainer/files/certs/ as a *.crt file before building. The Dockerfile copies the directory to /usr/local/share/ca-certificates/extra/ and runs update-ca-certificates, merging it into the system bundle at /etc/ssl/certs/ca-certificates.crt.

REQUESTS_CA_BUNDLE, SSL_CERT_FILE and NODE_EXTRA_CA_CERTS all point at that bundle, which covers Python (az, ansible, checkov, …), curl, and Node.js — Node ignores the system store, so it has to be told explicitly.

Certificates are git-ignored (*.crt, *.pem), so nothing is committed by accident. Adding none is fine: the build succeeds and the container trusts the public roots from the base image. See .devcontainer/files/certs/README.md.

🔄 CI/CD

GitHub Actions builds, tests and publishes the image to the GitHub Container Registry. There is nothing to configure - it runs on the repository's own GITHUB_TOKEN, with no secrets and no external registry account.

Workflow	Trigger	What it does
ci.yml	Pull requests	Lints, builds both architectures, runs the test suite. Publishes nothing
ci.yml	Push to main	The same, then publishes :main and :sha-<short>
release.yml	Sundays 03:00 UTC, or manually	A --no-cache rebuild, published as a dated release and :latest

Both call build.yml, which holds the actual build so the two entry points cannot drift apart.

How a build works

Each architecture builds on its own native runner - ubuntu-24.04 and ubuntu-24.04-arm - rather than under QEMU emulation, which would take hours for an image this size. Each runner builds its platform, loads it locally, runs tests/run-all-tests.sh against the real image, and only then pushes by digest. A final job merges the digests into one multi-architecture manifest.

Versioning

Releases are calendar-versioned: v2026.08.09 is the image as it was built on that date. Most entries in versions.json are "install latest", so a tag is a point-in-time snapshot rather than a reproducible build - rebuilding the same tag a week later would produce a different image. If you need one exact image, pin the digest, which every release records.

Supply chain

Every published image carries an SBOM and SLSA build provenance, generated by BuildKit and signed with a short-lived Sigstore certificate. Verify that an image really came from this repository:

gh attestation verify oci://ghcr.io/dbhq-uk/devcontainer-devops:latest \
  -R dbhq-uk/devcontainer-devops

Read the SBOM out of the image:

docker buildx imagetools inspect ghcr.io/dbhq-uk/devcontainer-devops:latest \
  --format '{{ json .SBOM }}'

Trivy scans each build for HIGH and CRITICAL vulnerabilities and reports them to the repository's Security tab. Scans report, they do not block: an image bundling the Azure CLI, Ansible and a .NET SDK always carries some upstream findings, and blocking on those would stop the weekly rebuild and leave the published image staler than the CVEs it was avoiding.

🛠️ Customization

Adding New Tools

1. Create an installation script in .devcontainer/files/install/. It should take the desired version as $1, resolve the latest when that argument is empty, and verify the install before exiting:

   .devcontainer/files/install/install-your-tool.sh

   The whole directory is copied and chmod +x'd in one step, so no COPY line is needed per script.

   The image is built for amd64 and arm64, so never hardcode an architecture. Source the shared helper and use the spelling your upstream uses:

   . "$(dirname "$0")/_arch.sh"
   # ARCH_DEB  amd64  / arm64     Debian and Go convention, most releases
   # ARCH_X64  x64    / arm64     e.g. gitleaks
   # ARCH_GNU  x86_64 / aarch64   Rust target triples, e.g. uv

   If the tool has no arm64 Linux build, say so in a comment and skip it on that architecture rather than failing the build.

2. Add an ARG YOUR_TOOL_VERSION= to both blocks at the top of the Dockerfile (before and after the FROM), then invoke the script:

   RUN /tmp/install/install-your-tool.sh ${YOUR_TOOL_VERSION}

   Place the RUN as late in the file as the dependencies allow — a version bump invalidates every layer after it.

3. Record the version in versions.json, add a validate_tool line to tests/validate-tools.sh, and note it in CHANGELOG.md.

4. Rebuild the container

Modifying Tool Versions

versions.json is the documented source of truth for tool versions; an empty string means "install latest". See VERSION_MANAGEMENT.md for the per-tool version sources.

The Dockerfile ARGs default to empty (latest). .devcontainer/devcontainer.json builds from the local Dockerfile by default — to pin, add the versions to its build.args block:

"args": {
    "UBUNTU_VERSION": "24.04",
    "TERRAFORM_VERSION": "1.13.5",
    "POWERSHELL_VERSION": "7.5.4"
}

CI does not pass these build args, so published images install the latest of everything left unpinned in the Dockerfile. That is deliberate - see Versioning - and it is why a release tag is a snapshot rather than a reproducible build.

📝 Usage Examples

Terraform

terraform init
terraform plan
terraform apply

Azure CLI

az login
az account list
az group create --name myResourceGroup --location eastus

Docker

docker ps
docker build -t myimage .
docker run myimage

Helm & Kubernetes

kubectl get pods
helm install myrelease mychart/

AI Tooling

claude                  # start Claude Code
codex-init              # one-off: configure Codex endpoint and deployment

cswap list              # list managed Claude Code accounts
cswap status            # show the account currently in use
cswap add               # register the account you are signed in as
cswap switch            # rotate to the next account

🤝 Contributing

1. Create a feature branch
2. Make your changes
3. Test in the devcontainer
4. Submit a pull request

📄 License

MIT - see LICENSE.

🐛 Troubleshooting

Container won't build

• Ensure Docker Desktop is running
• Check Docker has sufficient resources (CPU/Memory)
• Try rebuilding without cache: Dev Containers: Rebuild Container

Permission issues in /workspace

• The postCreateCommand should handle this automatically
• Manually run: sudo chown -R vscode:vscode /workspace

Tool not found

• Verify the installation script exists in .devcontainer/files/install/
• Check the Dockerfile has a RUN /tmp/install/install-<tool>.sh step
• Confirm it appears in tests/validate-tools.sh, then run that script
• Rebuild the container

A home-directory tool is missing or stale after a rebuild

/home/vscode is a persistent per-user volume, seeded from the image only on first start. Anything installed into the home tree (Claude Code, for example) will not refresh for an existing volume. Remove the dev-home-<user> volume to re-seed, or update the tool in place.

📞 Support

Open an issue. For anything security-related, follow SECURITY.md instead of opening a public issue.