# Ansible

### Intro

It is a operations tool that provides

1. IT automation
2. Configuration management
3. Automatic deployment

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### Push/Pull Architecture

#### Pull Architecture

* Nodes check with the server periodically and fetch the configurations from it
* Examples are **Chef** & **Puppet**
* Requires clients to be installed on the nodes i.e Master/Slave architecture

#### Push Architecture

* Server pushes configuration via ansible modules (small programs) to the nodes
* **Ansible** uses the push architecture
* It uses agentless approach since it uses SSH to deploy the configuration on the nodes
* We can also use custom authentication protocols like **Kerberos** via plugins

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### Ansible Architecture

* Have a Local Machine where Ansible is installed
* Nodes are the systems to be configured. They are controlled by the local machine
* Module is collection of configuration files
  * These config files are called [playbooks](https://notes.nomanaziz.me/devops/infrastructure-as-a-code-iac/ansible/1.-playbooks)
* [Inventory](https://notes.nomanaziz.me/devops/infrastructure-as-a-code-iac/ansible/3.-inventory) is a document that groups the nodes under specific labels

<figure><img src="https://1920086362-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FDfv51K0WXLZdwTryHQZc%2Fuploads%2FRqqLpuJl7YVtY3oSsEnn%2Fimage.png?alt=media&#x26;token=73176353-9715-44cf-9201-2911e67a8001" alt=""><figcaption></figcaption></figure>


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