Pulumi ESC (Environments, Secrets, and Configuration)

Pulumi ESC is a centralized service for managing environments, secrets, and configuration across cloud infrastructure and applications.

What is ESC?

ESC enables teams to:

• Centralize secrets and configuration in one secure location
• Compose environments by importing and layering configuration
• Generate dynamic credentials via OIDC for AWS, Azure, GCP
• Integrate external secret stores (AWS Secrets Manager, Azure Key Vault, Vault, 1Password)
• Version and audit all configuration changes
• Control access with fine-grained RBAC

Essential CLI Commands

# Create a new environment
pulumi env init <org>/<project-name>/<environment-name>

# Edit environment (opens in editor)
pulumi env edit <org>/<project-name>/<environment-name>

# Set values
pulumi env set <org>/<project-name>/<environment-name> <key> <value>
pulumi env set <org>/<project-name>/<environment-name> <key> <value> --secret

# View definition (secrets hidden)
pulumi env get <org>/<project-name>/<environment-name>

# Open and resolve (reveals secrets)
pulumi env open <org>/<project-name>/<environment-name>

# Run command with environment
pulumi env run <org>/<project-name>/<environment-name> -- <command>

# Link to Pulumi stack
pulumi config env add <project-name>/<environment-name>

Key Concepts

Command Distinctions

• pulumi env get: Shows static definition, secrets appear as [secret]
• pulumi env open: Resolves and reveals all values including secrets and dynamic credentials
• pulumi env run: Executes commands with environment variables loaded
• pulumi config env add: Only takes the <project-name>/<environment-name> portion

Environment Structure

Environments are YAML documents with reserved top-level keys:

• imports: Import and compose other environments
• values: Define configuration and secrets

Reserved sub-keys under values:

• environmentVariables: Map values to shell environment variables
• pulumiConfig: Configure Pulumi stack settings
• files: Generate files with environment data

Basic Example

imports:
  - common/base-config

values:
  environment: production
  region: us-west-2

  dbPassword:
    fn::secret: super-secure-password

  environmentVariables:
    AWS_REGION: ${region}
    DB_PASSWORD: ${dbPassword}

  pulumiConfig:
    aws:region: ${region}
    app:dbPassword: ${dbPassword}

Working with the User

For Simple Questions

If the user asks basic questions like "How do I create an environment?" or "What's the difference between get and open?", answer directly using the information above.

For Detailed Documentation

When users need more information, use the web-fetch tool to get content from the official Pulumi ESC documentation:

• Complete YAML syntax and functions → https://www.pulumi.com/docs/esc/environments/syntax/
• Provider integrations (AWS, Azure, GCP, Vault, 1Password):
  • AWS: https://www.pulumi.com/docs/esc/integrations/dynamic-login-credentials/aws-login/
  • Azure: https://www.pulumi.com/docs/esc/integrations/dynamic-login-credentials/azure-login/
  • GCP: https://www.pulumi.com/docs/esc/integrations/dynamic-login-credentials/gcp-login/
  • Short-term credential (OIDC) providers: https://www.pulumi.com/docs/esc/integrations/dynamic-login-credentials/
  • Dynamic secret providers: https://www.pulumi.com/docs/esc/integrations/dynamic-secrets/
• Getting started guide → https://www.pulumi.com/docs/esc/get-started/
• CLI reference → https://www.pulumi.com/docs/esc/cli/commands/
  • Prefer using the pulumi env subcommands over esc CLI.

Use the web-fetch tool with specific prompts to extract relevant information from these docs.

For Complex Tasks

When helping users:

1. Understand the goal: Are they setting up new environments, migrating from stack config, or debugging?
2. Check existing setup: Use pulumi env commands to list environments or read definitions
3. Fetch relevant documentation: Use the web-fetch to get specific examples or syntax from the official docs
4. Provide step-by-step guidance: Walk through the process with specific commands
5. Validate: Help them test with pulumi env get or pulumi preview a. Only use pulumi env open when the full resolved values are needed, but use cautiously as it reveals secrets.

Example: Helping with AWS OIDC Setup

User: "How do I set up AWS OIDC credentials in ESC?"

1. Use the web-fetch tool to get AWS OIDC documentation from "https://www.pulumi.com/docs/esc/integrations/dynamic-login-credentials/aws-login/"
2. Provide the user with the configuration
3. Ask the user if they have a pre-defined role or need one created for them
4. Set up as much of the environment as possible, then guide them through any steps that you can't do for them
5. Help them test with `pulumi env get` or `pulumi env open` if necessary

Common Workflows

Creating an Environment

pulumi env init my-org/my-project/dev-config
# Edit environment (accepts new definition from a file, better for agents, more difficult for users)
pulumi env edit --file /tmp/example.yml my-org/my-project/dev-config

Linking to Stack

pulumi config env add my-project/dev-config
pulumi config  # Verify environment values are accessible

API Access (Rare)

Always prefer CLI commands. Only use the API when absolutely necessary (e.g., bulk operations, automation).

Available API endpoints include:

• GET /api/esc/environments/{orgName} - List environments
• GET /api/esc/environments/{orgName}/{projectName}/{envName} - Read environment definition
• GET /api/esc/providers?orgName={orgName} - List available providers

Use call_pulumi_cloud_api() tool to make requests when needed.

Best Practices

1. Always use fn::secret for sensitive values
2. Prefer OIDC over static keys
3. Use descriptive names like <org>/my-app/production-aws not <org>/app/prod
4. Layer environments: base → cloud-provider → stack-specific
5. Verify that pulumi config shows expected values after linking an environment to a stack
6. Prefer using pulumi env run for commands needing environment variables
7. Only use pulumi env open when absolutely necessary, as it reveals secrets

Quick Troubleshooting

• "Environment not found": Check permissions with pulumi env ls -o <org>
• "Secret decryption failed": Use pulumi env open not pulumi env get
• "Stack can't read values": Verify pulumi config env ls to ensure the stack is listed.
  • Ensure the environment is referenced only by the project-name/environment-name format.
  • Get the specific environment definition with pulumi env get <org>/<project-name>/<environment-name>.
  • Verify the pulumiConfig key exists and is nested under the values key.