README
¶
atmos
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atmos
- Universal Tool for DevOps and Cloud Automation.
This project is part of our comprehensive "SweetOps" approach towards DevOps.
It's 100% Open Source and licensed under the APACHE2.
Introduction
atmos
is both a library and a command-line tool for provisioning, managing and orchestrating workflows across various toolchains.
We use it extensively for automating cloud infrastructure and Kubernetes clusters.
atmos
includes workflows for dealing with:
- Provisioning Terraform components
- Deploying helm charts to Kubernetes clusters using helmfile
- Executing helm commands on Kubernetes clusters
- Provisioning istio on Kubernetes clusters using istio operator and helmfile
- Executing kubectl commands on Kubernetes clusters
- Executing AWS SDK commands to orchestrate cloud infrastructure
- Running AWS CDK constructs to define cloud resources
- Executing commands for the serverless framework
- Executing shell commands
- Combining various commands into workflows to execute many commands sequentially in just one step
- ... and many more
In essence, it's a tool that orchestrates the other CLI tools in a consistent and self-explaining manner.
It's a superset of all other tools and task runners (e.g. make
, terragrunt
, terraform
, aws
cli, gcloud
, etc.)
and is intended to be used to tie everything together, so you can provide a simple CLI interface for your organization.
Moreover, atmos
is not only a command-line interface for managing clouds and clusters. It provides many useful patterns and best practices, such as:
- Enforces Terraform and helmfile project structure (so everybody knows where things are)
- Provides separation of configuration and code (so the same code could be easily deployed to different regions, environments and stages)
- It can be extended to include new features, commands, and workflows
- The commands have a clean, consistent and easy to understand syntax
- The CLI code is modular and self-documenting
Install
OSX
From Homebrew directly:
brew install atmos
Linux
On Debian:
# Add the Cloud Posse package repository hosted by Cloudsmith
apt-get update && apt-get install -y apt-utils curl
curl -1sLf 'https://dl.cloudsmith.io/public/cloudposse/packages/cfg/setup/bash.deb.sh' | bash
# Install atmos
apt-get install atmos@="<ATMOS_VERSION>-*"
On Alpine:
# Install the Cloud Posse package repository hosted by Cloudsmith
curl -sSL https://apk.cloudposse.com/install.sh | bash
# Install atmos
apk add atmos@cloudposse~=<ATMOS_VERSION>
Go
Install the latest version
go install github.com/cloudposse/atmos
Get a specific version
NOTE: Since the version is passed in via -ldflags
during build, when running go install
without using -ldflags
,
the CLI will return 0.0.1
when running atmos version
.
go install github.com/cloudposse/atmos@v1.3.9
Build from source
make build
or run this and replace $version
with the version that should be returned with atmos version
.
go build -o build/atmos -v -ldflags "-X 'github.com/cloudposse/atmos/cmd.Version=$version'"
Usage
There are a number of ways you can leverage this project:
Recommended Layout
Our recommended filesystem layout looks like this:
│ # CLI configuration
└── cli/
│
│ # Centralized components configuration
├── stacks/
│ │
│ └── $stack.yaml
│
│ # Components are broken down by tool
├── components/
│ │
│ ├── terraform/ # root modules in here
│ │ ├── vpc/
│ │ ├── eks/
│ │ ├── rds/
│ │ ├── iam/
│ │ ├── dns/
│ │ └── sso/
│ │
│ └── helmfile/ # helmfiles are organized by chart
│ ├── cert-manager/helmfile.yaml
│ └── external-dns/helmfile.yaml
│
│ # Makefile for building the CLI
├── Makefile
│
│ # Docker image for shipping the CLI and all dependencies
└── Dockerfile (optional)
Example
The example folder contains a complete solution that shows how to:
- Structure the Terraform and helmfile components
- Configure the CLI
- Add stack configurations for the Terraform and helmfile components (to provision them to different environments and stages)
CLI Configuration
Centralized Project Configuration
atmos
provides separation of configuration and code, allowing you to provision the same code into different regions, environments and stages.
In our example, all the code (Terraform and helmfiles) is in the components folder.
The centralized stack configurations (variables for the Terraform and helmfile components) are in the stacks folder.
In the example, all stack configuration files are broken down by environments and stages and use the predefined format $environment-$stage.yaml
.
Environments are abbreviations of AWS regions, e.g. ue2
stands for us-east-2
, whereas uw2
would stand for us-west-2
.
$environment-globals.yaml
is where you define the global values for all stages for a particular environment.
The global values get merged with the $environment-$stage.yaml
configuration for a specific environment/stage by the CLI.
In the example, we defined a few config files:
- ue2-dev.yaml - stack configuration (Terraform and helmfile variables) for the environment
ue2
and stagedev
- ue2-staging.yaml - stack configuration (Terraform and helmfile variables) for the environment
ue2
and stagestaging
- ue2-prod.yaml - stack configuration (Terraform and helmfile variables) for the environment
ue2
and stageprod
- ue2-globals.yaml - global settings for the environment
ue2
(e.g.region
,environment
) - globals.yaml - global settings for the entire solution
NOTE: The stack configuration structure and the file names described above are just an example of how to name and structure the config files.
You can choose any file name for a stack. You can also include other configuration files (e.g. globals for the environment, and globals for the entire solution)
into a stack config using the import
directive.
Stack configuration files have a predefined format:
import:
- ue2-globals
vars:
stage: dev
terraform:
vars: {}
helmfile:
vars: {}
components:
terraform:
vpc:
command: "/usr/bin/terraform-0.15"
backend:
s3:
workspace_key_prefix: "vpc"
vars:
cidr_block: "10.102.0.0/18"
eks:
backend:
s3:
workspace_key_prefix: "eks"
vars: {}
helmfile:
nginx-ingress:
vars:
installed: true
It has the following main sections:
import
- (optional) a list of stack configuration files to import and combine with the current configuration filevars
- (optional) a map of variables for all components (Terraform and helmfile) in the stackterraform
- (optional) configuration (variables) for all Terraform componentshelmfile
- (optional) configuration (variables) for all helmfile componentscomponents
- (required) configuration for the Terraform and helmfile components
The components
section consists of the following:
-
terraform
- defines variables, the binary to execute, and the backend for each Terraform component. Terraform component names correspond to the Terraform components in the components folder -
helmfile
- defines variables and the binary to execute for each helmfile component. Helmfile component names correspond to the helmfile components in the helmfile folder
Run the Example
To run the example, execute the following commands in a terminal:
cd example
make all
- it will build the Docker image, build the CLI tool inside the image, and then start the container
Provision Terraform Component
To provision a Terraform component using the atmos
CLI, run the following commands in the container shell:
atmos terraform plan eks --stack=ue2-dev
atmos terraform apply eks --stack=ue2-dev
where:
eks
is the Terraform component to provision (from thecomponents/terraform
folder)--stack=ue2-dev
is the stack to provision the component into
Short versions of the command-line arguments can be used:
atmos terraform plan eks -s ue2-dev
atmos terraform apply eks -s ue2-dev
To execute plan
and apply
in one step, use terraform deploy
command:
atmos terraform deploy eks -s ue2-dev
Provision Helmfile Component
To provision a helmfile component using the atmos
CLI, run the following commands in the container shell:
atmos helmfile diff nginx-ingress --stack=ue2-dev
atmos helmfile apply nginx-ingress --stack=ue2-dev
where:
nginx-ingress
is the helmfile component to provision (from thecomponents/helmfile
folder)--stack=ue2-dev
is the stack to provision the component into
Short versions of the command-line arguments can be used:
atmos helmfile diff nginx-ingress -s ue2-dev
atmos helmfile apply nginx-ingress -s ue2-dev
To execute diff
and apply
in one step, use helmfile deploy
command:
atmos helmfile deploy nginx-ingress -s ue2-dev
Workflows
Workflows are a way of combining multiple commands into one executable unit of work.
In the CLI, workflows can be defined using two different methods:
- In the configuration file for a stack (see workflows in ue2-dev.yaml for an example)
- In a separate file (see workflow1.yaml
In the first case, we define workflows in the configuration file for the stack (which we specify on the command line). To execute the workflows from workflows in ue2-dev.yaml, run the following commands:
atmos workflow terraform-plan-all-tenant1-ue2-dev -s tenant1-ue2-dev
Note that workflows defined in the stack config files can be executed only for the particular stack (environment and stage). It's not possible to provision resources for multiple stacks this way.
In the second case (defining workflows in a separate file), a single workflow can be created to provision resources into different stacks. The stacks for the workflow steps can be specified in the workflow config.
For example, to run terraform plan
and helmfile diff
on all terraform and helmfile components in the example, execute the following command:
atmos workflow plan-all -f workflows
where the command-line option -f
(--file
for long version) instructs the atmos
CLI to look for the plan-all
workflow in the file workflows.
As we can see, in multi-environment workflows, each workflow job specifies the stack it's operating on:
workflows:
terraform-plan-all-test-components:
description: |
Run 'terraform plan' on 'test/test-component' and all its derived components.
The stack must be provided on the command line: atmos workflow terraform-plan-all-test-components -f workflow1 -s <stack>
steps:
- command: terraform plan test/test-component
- command: terraform plan test/test-component-override
- command: terraform plan test/test-component-override-2
- command: terraform plan test/test-component-override-3
You can also define a workflow in a separate file without specifying the stack in the workflow's job config. In this case, the stack needs to be provided on the command line.
For example, to run the terraform-plan-all-tenant1-ue2-dev
workflow from the workflows file for the tenant1-ue2-dev
stack,
execute the following command:
atmos workflow terraform-plan-all-tenant1-ue2-dev -f workflow1 -s tenant1-ue2-dev
Validation
atmos
component validation allows:
- Validate component config (vars, settings, backend, and other sections) using JSON Schema
- Check if the component config (including relations between different component variables) is correct to allow or deny component provisioning using OPA/Rego policies
atmos
validate component
command supports --schema-path
and --schema-type
command line arguments.
If the arguments are not provided, atmos
will try to find and use the settings.validation
section defined in the component's YAML config.
atmos validate component infra/vpc -s tenant1-ue2-prod --schema-path validate-infra-vpc-component.json --schema-type jsonschema
atmos validate component infra/vpc -s tenant1-ue2-prod --schema-path validate-infra-vpc-component.rego --schema-type opa
atmos validate component infra/vpc -s tenant1-ue2-prod
atmos validate component infra/vpc -s tenant1-ue2-dev
Configure component validation
In atmos.yaml
, add the schemas
config:
# Validation schemas (for validating atmos stacks and components)
schemas:
# https://json-schema.org
jsonschema:
# Can also be set using `ATMOS_SCHEMAS_JSONSCHEMA_BASE_PATH` ENV var, or `--schemas-jsonschema-dir` command-line arguments
# Supports both absolute and relative paths
base_path: "stacks/schemas/jsonschema"
# https://www.openpolicyagent.org
opa:
# Can also be set using `ATMOS_SCHEMAS_OPA_BASE_PATH` ENV var, or `--schemas-opa-dir` command-line arguments
# Supports both absolute and relative paths
base_path: "stacks/schemas/opa"
In the component YAML config, add the settings.validation
section:
components:
terraform:
infra/vpc:
settings:
# Validation
# Supports JSON Schema and OPA policies
# All validation steps must succeed to allow the component to be provisioned
validation:
validate-infra-vpc-component-with-jsonschema:
schema_type: jsonschema
# 'schema_path' can be an absolute path or a path relative to 'schemas.jsonschema.base_path' defined in `atmos.yaml`
schema_path: validate-infra-vpc-component.json
description: Validate 'infra/vpc' component variables using JSON Schema
check-infra-vpc-component-config-with-opa-policy:
schema_type: opa
# 'schema_path' can be an absolute path or a path relative to 'schemas.opa.base_path' defined in `atmos.yaml`
schema_path: validate-infra-vpc-component.rego
description: Check 'infra/vpc' component configuration using OPA policy
Add the following JSON Schema in the file stacks/schemas/jsonschema/validate-infra-vpc-component.json
:
{
"$id": "infra-vpc-component",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"title": "infra/vpc component validation",
"description": "JSON Schema for infra/vpc atmos component.",
"type": "object",
"properties": {
"vars": {
"type": "object",
"properties": {
"region": {
"type": "string"
},
"cidr_block": {
"type": "string",
"pattern": "^([0-9]{1,3}\\.){3}[0-9]{1,3}(/([0-9]|[1-2][0-9]|3[0-2]))?$"
},
"map_public_ip_on_launch": {
"type": "boolean"
}
},
"additionalProperties": true,
"required": [
"region",
"cidr_block",
"map_public_ip_on_launch"
]
}
}
}
Add the following OPA policy in the file stacks/schemas/opa/validate-infra-vpc-component.rego
:
# 'atmos' looks for the 'errors' (array of strings) output from all OPA policies
# If the 'errors' output contains one or more error messages, 'atmos' considers the policy failed
# 'package atmos' is required in all `atmos` OPA policies
package atmos
# In production, don't allow mapping public IPs on launch
errors[message] {
input.vars.stage == "prod"
input.vars.map_public_ip_on_launch == true
message = "Mapping public IPs on launch is not allowed in 'prod'. Set 'map_public_ip_on_launch' variable to 'false'"
}
# In 'dev', only 2 Availability Zones are allowed
errors[message] {
input.vars.stage == "dev"
count(input.vars.availability_zones) != 2
message = "In 'dev', only 2 Availability Zones are allowed"
}
Run the following commands to validate the component in the stacks:
> atmos validate component infra/vpc -s tenant1-ue2-prod
Check 'infra/vpc' component configuration using OPA policy
Mapping public IPs on launch is not allowed in 'prod'. Set 'map_public_ip_on_launch' variable to 'false'
exit status 1
> atmos validate component infra/vpc -s tenant1-ue2-dev
Check 'infra/vpc' component configuration using OPA policy
In 'dev', only 2 Availability Zones are allowed
exit status 1
> atmos validate component infra/vpc -s tenant1-ue2-staging
Validate 'infra/vpc' component variables using JSON Schema
{
"valid": false,
"errors": [
{
"keywordLocation": "",
"absoluteKeywordLocation": "file:///examples/complete/stacks/schemas/jsonschema/infra-vpc-component#",
"instanceLocation": "",
"error": "doesn't validate with file:///examples/complete/stacks/schemas/jsonschema/infra-vpc-component#"
},
{
"keywordLocation": "/properties/vars/properties/cidr_block/pattern",
"absoluteKeywordLocation": "file:///examples/complete/stacks/schemas/jsonschema/infra-vpc-component#/properties/vars/properties/cidr_block/pattern",
"instanceLocation": "/vars/cidr_block",
"error": "does not match pattern '^([0-9]{1,3}\\\\.){3}[0-9]{1,3}(/([0-9]|[1-2][0-9]|3[0-2]))?$'"
}
]
}
exit status 1
Run the following commands to provision the component in the stacks:
atmos terraform apply component infra/vpc -s tenant1-ue2-prod
atmos terraform apply component infra/vpc -s tenant1-ue2-dev
Since the OPA validation policies don't pass, atmos
does not allow provisioning the component in the stacks:
Help
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File a GitHub issue, send us an email or join our Slack Community.
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Contributing
Bug Reports & Feature Requests
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Copyright
Copyright © 2017-2022 Cloud Posse, LLC
License
See LICENSE for full details.
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements. See the NOTICE file
distributed with this work for additional information
regarding copyright ownership. The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License. You may obtain a copy of the License at
https://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied. See the License for the
specific language governing permissions and limitations
under the License.
Trademarks
All other trademarks referenced herein are the property of their respective owners.
About
This project is maintained and funded by Cloud Posse, LLC. Like it? Please let us know by leaving a testimonial!
We're a DevOps Professional Services company based in Los Angeles, CA. We ❤️ Open Source Software.
We offer paid support on all of our projects.
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Contributors
![]() Erik Osterman |
![]() Andriy Knysh |
![]() RB |
---|
Documentation
¶
There is no documentation for this package.