provisioning.md

Provisioning Machines

Provisioning Machines

$ cd $INTRO_ANSIBLE_DIR/cloud-provisioning
$ tree
.
├── ansible
.
.
├── templates
│   └── index.html
└── wsgi.py

Provisioning Machines

In this lesson we'll set up a an application in Catalyst Cloud

App server

Runs a basic Flask (Python) app

DB server

Dedicated postgresql database

Web server

Nginx proxy requests to app server

Setup

• Need to set up a few things so we can interact with Catalyst Cloud easily
  • clouds.yaml file for authenticating with the cloud
  • inventory file with hosts
• Verify that you have files in:
  • ~/.ansible/inventory/cloud-hosts
  • ~/.config/openstack/clouds.yaml
• If not, run the setup playbook

  ansible-playbook  ansible/local-setup.yml
  

Provisioning machines

• Have a look at ansible/provision-hosts.yml
• This playbook does the following:
  • Creates networks/subnets in Catalyst Cloud
  • Create security groups to control access
  • Sets up routers
  • Creates servers
• Run the playbook

   $ ansible-playbook -K ansible/provision-hosts.yml 
  

Note: might need to have participants install ansible==2.5.5 and shade==1.28.0 due to problems with openstack modules

Exercise: check that hosts are running and reachable

• Use a tool that you have learned about to verify that hosts can be reached by SSH

  $ ansible mycluster -m ping
  

Deploying applications

• ansible/deploy-app.yml sets up
  • The database server
    • Installs postgresql
    • Sets up database
  • The application servers
    • Installs Python
    • Sets up framework middleware (gunicorn)
  • The web server
    • Installs nginx
    • Proxy requests to app server

Deploy an Application

• Run the deploy playbook

  ansible-playbook ansible/deploy-app.yml
  

• Once deploy is finished visit the new website website

Cleaning up

• When you are done playing with cats, please clean up your cluster

  ansible-playbook -K  ansible/remove-hosts.yml