The Need and Importance of Ansible
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An overview and description of how ansible plays a big role in having a less complex DevOps . Whiteklay has deep roots in using ansible and uses it for automating all its installation activities for deploying large-scale clusters having multiple software and hardware combinations.
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The Need and Importance of Ansible
- 1. 1 Whiteklay technologies Pvt Ltd www.whiteklay.com - info@whiteklay.com Need and Importance of an Ansible
- 2. 2 Whiteklay Technologies Mandar D Gogate Bigdata-DevOps Engineer Whiteklay Technologies Pvt. Ltd. Email :- mandar.g@whiteklay.in Website : www.whiteklay.com About The Presenter
- 3. 3 Whiteklay Technologies Agenda:- • Before Ansible.. • After Ansible came in to picture • How – It Works • Installation • Ad-hoc commands • Inventory • Playbooks • Handlers • Roles • Modules • Ansible Galaxy
- 4. 4 Whiteklay Technologies What we do.. i) Building VM template ii) Cluster configuration iii) Storage Management iv) Alert Monitoring v) Customer Support vi) Software Deployment vii) Authorization / Authentication viii) Performance Testing ix) Software Upgradation x) OS Upgradation
- 5. 5 Whiteklay Technologies How we do it.. Building VM template i) ISO install & configuration ii) Network setup iii) Set up User/Group,Security iv) Software install & Configure Server Maintenance i) Ssh into each server & restart service ii) Write scripts to log in to each server & update openssl Building Clustors i) Cloning no. of VMs from templates ii) Hostname / Network Configuration iii) Firewall configuration
- 8. 8 Whiteklay Technologies Ansible coming to rescue..!
- 9. 9 Whiteklay Technologies Ansible:- 1) It is simple and easy to learn IT automation system. 2) It handles configuration-management, application deployment. 3) It provides cloud provisioning, ad-hoc task- execution with multimode orchestration. 4) It also provides zero downtime rolling updates with load balancers. #Read the document and more at :- http://ansible.com/
- 10. 10 Whiteklay Technologies Features:- i) Agent less ii) Uses ssh iii) Everything is a YAML file iv) Easily extensible via modules v) Encryption and Security built in vi) More feature available in enterprise ( Tower) vii) Idempotent
- 11. 11 Whiteklay Technologies How it works..? Building Blocks:- i) Inventory ii) Ad-hoc commands ii) Playbook :- a) Tasks b) Variables c) Roles d) Handlers e) Templates f) Modules
- 12. 12 Whiteklay Technologies Installation:- Control Machine Managed Nodes ssh Python >= 2.6/2.7 Different ansible installation commands:- # pip install ansible # yum install ansible # apt-get install ansible Python >= 2.5
- 13. 13 Whiteklay Technologies Ad-hoc commands:- Control Machine Managed Nodes ssh ssh ssh Host1 Host2 Host3 Inventory File:- Host1 Host2 Host3
- 15. 15 Whiteklay Technologies Structure of an inventory file:- [webservers] Host1 <ip> [lamp] Host2 <ip> Host3 <ip>
- 16. 16 Whiteklay Technologies Playbooks - Example
- 19. 19 Whiteklay Technologies Handlers:- i) They are just written like a regular task ii) They indicates a change in the system iii)Any module can be used for the handler action iv) Only run if triggered by the notify directive Handler example:- -name: Restart the tomcat service : name= tomcat state=restarted
- 21. 21 Whiteklay Technologies Roles:- It is a way of automatically loading certain vars_files, tasks and handlers based on a known file structure.
- 22. 22 Whiteklay Technologies • Tasks - contains the main list of tasks to be executed by the role. • Handlers - contains handlers, which may be used by the role or even anywhere outside the role. • defaults - default variables for the role. • vars - other variables for the role. • files - contains files which can be deployed via the role. • templates - contains templates which can be deployed via the role. • meta - defines some meta data for the role. Meaning & Use of different directories of Roles:-
- 23. 23 Whiteklay Technologies Modules:- • Ansible ships with a number of modules (more than 1000.) • They are reusable, standalone scripts that can be used by the Ansible API, or by the ansible or ansible-playbook programs. • They can be executed directly on remote hosts or through Playbooks. • Users can also write their own modules. • They can control system resources, like services, packages, or files (anything really), or handle executing system commands. • They take parameters and conditions to define desired state.