UNIT-I Introduction to Ansible.pptx
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This document provides an overview of Ansible, including: - What Ansible is and why it is used for infrastructure automation and reducing manual tasks. - Key Ansible terms like modules, tasks, roles, facts, inventory, plays, handlers, and tags. - Ansible's architecture with an Ansible server running tasks on client nodes. - How to install Ansible on Linux systems like RHEL/CentOS and Debian/Ubuntu. - How ad-hoc commands allow running commands directly on servers without playbooks. - That playbooks are written in YAML format and are Ansible's main way to define complex automation tasks.
![Ansible Installation in Linux
Install Ansible on RedHat/Centos systems
Step 1: Install the EPEL repo
[root@ansible-server ~]# sudo yum install epel-release
Step 2: Install the Ansible package.
[root@ansible-server ~]# sudo yum install -y ansible](https://image.slidesharecdn.com/unit-iintroductiontoansible-230723140728-a2b8f296/85/UNIT-I-Introduction-to-Ansible-pptx-10-320.jpg)
![Ansible ad-hoc Commands
Ad-hoc commands are one of the simplest ways of using Ansible. These are used when
you want to issue some commands on a server or bunch of servers. The ad-hoc commands
are not stored for future use, but it represents a fast way to interact with the desired
servers.
Syntax
ansible <hosts> [-m <module_name>] -a <"arguments"> -u <username> [--become]](https://image.slidesharecdn.com/unit-iintroductiontoansible-230723140728-a2b8f296/85/UNIT-I-Introduction-to-Ansible-pptx-11-320.jpg)
UNIT-I Introduction to Ansible.pptx
- 2. 01 What is Ansible? 02 Why Use Ansible? 03 Ansible History Our Agenda
- 3. What is chef? Chef is used in infrastructure automation and helps in reducing manual and repetitive tasks for infrastructure management. Chef is a configuration management technology used to automate the infrastructure provisioning. It is developed on the basis of Ruby DSL language. It is used to streamline the task of configuration and managing the companys server. It has the capability to get integrated with any of the cloud technology.
- 4. Features of Chef Chef uses popular Ruby language to create a domain-specific language. Chef does not make assumptions on the current status of a node. It uses its mechanisms to get the current status of machine. Chef is ideal for deploying and managing the cloud server, storage, and software.
- 5. Advantages of Chef Lower barrier for entry Excellent integration with cloud Disadvantages of Chef One of the huge disadvantages of Chef is the way cookbooks are controlled. It needs constant babying so that people who are working should not mess up with others cookbooks. Only Chef solo is available. In the current situation, it is only a good fit for AWS cloud. It is not very easy to learn if the person is not familiar with Ruby. Documentation is still lacking.
- 7. Terms used in Ansible Terms Explanation Ansible Server It is a machine where Ansible is installed and from which all tasks and playbooks will be executed. Modules The module is a command or set of similar commands which is executed on the client-side. Task A task is a section which consists of a single procedure to be completed. Role It is a way of organizing tasks and related files to be later called in a playbook. Fact The information fetched from the client system from the global variables with the gather facts operation. Inventory A file containing the data regarding the Ansible client-server. Play It is the execution of the playbook. Handler The task is called only if a notifier is present. Notifier The section attributed to a task which calls a handler if the output is changed. Tag It is a name set to a task that can be used later on to issue just that specific task or group of jobs.
- 9. Ansible Installation in Linux Prerequisites PyYAML: a YAML parser and emitter for the python programming language. Httplib2: a comprehensive HTTP client library. parmiko: native python SSHv2 protocol library. Distro: RHEL/ CentOS/ Debian/ Ubuntu Linux. Jinja2: a modern and designer friendly templating language for python. sshpass: a non-interactive ssh password authentication.
- 10. Ansible Installation in Linux Install Ansible on RedHat/Centos systems Step 1: Install the EPEL repo [root@ansible-server ~]# sudo yum install epel-release Step 2: Install the Ansible package. [root@ansible-server ~]# sudo yum install -y ansible
- 11. Ansible ad-hoc Commands Ad-hoc commands are one of the simplest ways of using Ansible. These are used when you want to issue some commands on a server or bunch of servers. The ad-hoc commands are not stored for future use, but it represents a fast way to interact with the desired servers. Syntax ansible <hosts> [-m <module_name>] -a <"arguments"> -u <username> [--become]
- 12. Ansible Playbooks Playbooks are the files where the Ansible code is written. Playbooks are written in YAML format. YAML means "Yet Another Markup Language," so there is not much syntax needed. Playbooks are one of the core features of Ansible and tell Ansible what to execute, and it is used in complex scenarios. They offer increased flexibility.