Infrastructure Repository

Ansible

Roles

Use roles to organize related configurations.

Ansible galaxy init command initializes the base structure of a new role:

ansible-galaxy init role_name

Playbooks

Include new playbooks in syte.yml.

Default inventory file is environments/stage/hosts.

Configure stage environment:

ansible-playbook site.yml

Skip tags 'install' and 'ruby', when using pre-baked packer images:

ansible-playbook site.yml --skip-tags "install,ruby"

If you want configure prod environmet, you must specify inventory file:

ansible-playbook site.yml -i environments/prod/hosts --skip-tags "install,ruby"

Check playbooks(dry run):

ansible-playbook site.yml --check

group_vars & host_vars

Place files with variables inside these directories named after the group name or hostname defined in your inventory file.

provisioners

packer_app and packer_db playbooks are used to create pre-baked images with Packer.

Testing Using virtualenv with virtualenvwrapper http://docs.python-guide.org/en/latest/dev/virtualenvs/

Create test environment with vagrant

vagrant up

In directory with roles. Example of initializing new scenatio for role:

molecule init scenario --scenario-name default -r db -d vagrant

Create test vm:

molecule create

List testing vms:

molecule list

Apply playbooks for test vms:

molecule converge

Run tests:

molecule verify

Terraform

Use Terraform for building, changing and versioning infrastructure

Configure different environments(stage or production) using reusable modules.

Define user variables in terraform.tfvars file based on sample terraform.tfvars.example in environments folders.

Use commands below to build and change your infrastructure:

terraform plan
terraforn apply
terraform destroy
terraform fmt
terraform show

Packer

Use Packer to create pre-baked images.

Validate packer template ubuntu16.json

packer validate -var 'project_id=example-project' -var 'source_image=ubuntu-1604-xenial-v20170815a' ubuntu16.json

Discover what variables the template accepts.

packer inspect ubuntu16.json

Build image

packer build -var 'project_id=example-project' -var 'source_image=ubuntu-1604-xenial-v20170815a' -var 'tags=webserver, puma' ubuntu16.json

Scripts

Run deploy.sh script to deploy application.

Run startup_script.sh to make provisioning server and deploy application.

Create VM instance with startup script:

gcloud compute instances create --boot-disk-size=10GB --image=ubuntu-1604-xenial-v20170815a --image-project=ubuntu-os-cloud --machine-type=g1-small --tags puma-server --restart-on-failure --zone=europe-west1-b --metadata-from-file startup-script=startup_script.sh reddit-app