HOW ANSIBLE WORKS
HOW ANSIBLE WORKS
Ansible is an IT automation engine that automates cloud provisioning, configuration management, application deployment, intra-service orchestration, and a variety of other IT tasks. Ansible was built from the ground up for multi-tier deployments, and instead of controlling one system at a time, it models your IT architecture by defining how all of your systems interact.
It’s straightforward to deploy since it doesn’t require any agents or additional security infrastructure, and it employs a simple language (YAML, as Ansible Playbooks) to define your automation jobs in a style that’s close to plain English.
EFFICIENT ARCHITECTURE
Ansible connects to your nodes and sends little programmes known as “Ansible modules” to them. These programs are resource models for the system’s desired state. Ansible then runs these modules (by default over SSH) and removes them after they’re done. Your module library can be stored in any machine, and no servers, daemons, or databases are required. To keep track of changes to your material, you’ll most likely need your preferred terminal application, a text editor, and most likely a version control system.
SSH KEYS ARE YOUR FRIENDS
Passwords are supported, but one of the easiest methods to utilise Ansible is via SSH keys and ssh-agent. However, if you want to utilise Kerberos, that’s fine as well. There are many options! You don’t need to log in as root; you can log in as any user and then su or sudo to that user. The “authorized key” module in Ansible is a fantastic approach to control which computers can access which hosts. Other methods, such as kerberos or identity management systems, are available.
MANAGE YOUR INVENTORY IN SIMPLE TEXT FILES
Ansible’s default representation of the machines it manages is a very simple INI file that groups all of your managed computers into groups of your choosing. There is no need for an additional SSL signing server when adding new machines, thus it’s never a problem to figure out why a machine didn’t connect due to obscure NTP or DNS difficulties. If you have another source of truth in your infrastructure, Ansible can connect to it and pull inventory, group, and variable data from places like EC2, Rackspace, OpenStack, and others.
PLAYBOOKS: A SIMPLE+POWERFUL AUTOMATION LANGUAGE
Playbooks can finely manage different slices of your infrastructure topology, giving you complete control over how many computers to tackle. This is when Ansible becomes very fascinating. Ansible’s approach to orchestration is one of fine-tuned simplicity, as we think that your automation code should make perfect sense to you years down the road, with very little unique syntax or features to remember.
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