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tf-manage

A simple Terraform wrapper for organising your code and workflow.

Requirements

Linux

yum -y install wget sudo unzip git bash-completion which

MacOS

brew install unzip git bash-completion gnu-which coreutils wget

Installation

# clone repo and
git clone --recurse-submodules git@github.com:adobe/tf-manage.git
cd tf-manage

# run installer
# this will install:
# - terraform itself
# - the tf wrapper
# - and bash completion for the wrapper
./bin/tf_install.sh

# you can customize the version of terraform that is installed
./bin/tf_install.sh 1.0.11

# after the first install, you can use tf_install directly, as it is added to $PATH
# use it as a lightweight terraform version manager to switch back and forward between multiple versions
tf_install 0.12.24
tf_install 0.13.0
tf_install 1.0.1

# in order to upgrade tf-manage or choose a different version for the wrapper itself
cd /opt/terraform/tf-manage     # go to install dir
git fetch                       # pull in new references
git checkout <tag|branch|sha>   # choose desired version

# also ensure the vendored bash-framework is also pointing to the correct version
git submodule sync
git submodule update --init --recursive --remote

Validate install

The "tf" command should be registered to the PATH

$ tf
[tf] Usage: tf <product> <repo> <module> <env> <component> <action> [workspace]

Prepare environment for testing bash-completion

mkdir /tmp/test
cd /tmp/test
git init

Test bash completion by typing "tf", followed by tabs

tf [TAB] [TAB]

You should be greeted by the interactive repository initiation tutorial built into the bash-completion

[tf] Couldn't find tf-manage config file .tfm.conf for test
[tf] You must create it at /private/tmp/test/.tfm.conf
[tf] Or generate it, by running the snippet below:
cat > /private/tmp/test/.tfm.conf <<-EOF
#!/bin/bash
export __tfm_env_rel_path='terraform/environments'
export __tfm_module_rel_path='terraform/modules'
EOF
[tf] You can customize the values if needed
[tf] Then, re-run the script after you're done

Features

Organise

  • use an intuitive folder structure that blends flexibility and scalability for the needs of most team sizes
# sample folder structure
$ tree -a -I .git
.
├── .tfm.conf
└── terraform
    ├── environments
    │   └── product1
    │       ├── env1
    │       │   └── module1
    │       │       ├── component1.tfvars
    │       │       └── component2.tfvars
    │       └── env2
    │           └── module1
    │               ├── component1.tfvars
    │               └── component2.tfvars
    └── modules
        └── module1
            └── main.tf
  • lower risk of human error - the wrapper generates these for you
    • var-file paths (built into terraform commands that accept them)
    • unique human-friendly terraform workspace names
    • automatic workspace select and prompts for creating new ones
    • use ENV vars to substitute key parameters, when building repo copy-paste friendly documentation
  • when you're ready to move to a CI environment
    • just set export TF_EXEC_MODE_OVERRIDE="non_empty_value"
    • this will set an internal flag that will disable user prompts and auto-accept terraform confirmations for some commands like apply and destroy.`
$ tf
[tf] Usage: tf <product> <repo> <module> <env> <component> <action> [workspace]

Ease of use

  • auto-completion (Bash only for now)
  • simple onboarding

Encourage best practices

  • separation (and isolation) of enviroments
  • reduce blast radius by writing multiple modules with different logical roles (network, dns, lb, vms, etc, alerts, monitors, etc.)
  • team collaboration and onboarding is easy via terraform workspaces (auto-created/selected by the tf-manage) and a remote state implementation
  • cross-team collaboration is also intuitive if both teams use the same workspace format enforced/enabled by this tool and read-only access to remote state is provided across teams

DRY code

  • write and use native Terraform code
  • easy to re-use code (write module once, then create .tfvars files for your environments and module instance variations - or as we call them, "components")
  • use workspaces and remote state to reference upstream module outputs in a logical and programmable-friendly manner
# Sample workspaces
Pattern: <product>.<repo>.<module>.<env>.<component>
Samples:
adobe-dps.network-management.vpc.prod01.services
adobe-dps.network-management.vpc.prod01.admin
adobe-dps.dps-infrastructure.elb-sg.prod01.public-appbuilder
adobe-dps.dps-infrastructure.elb.prod01.public-appbuilder
adobe-dps.dps-infrastructure.rds.prod01.public-appbuilder
adobe-dps.dps-infrastructure.ec2-sg.prod01.public-appbuilder
adobe-dps.dps-infrastructure.ec2.prod01.public-appbuilder

Demos

terraform init

tf init

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