Ansible Roles

==================

code reuse

DRY --> Don't repeat yourself

A standard structure of writing playbooks that contains tasks, variables, dependencies, files, templates, libraries. We can reuse roles.

roles/role-name

tasks --> You can keep all your tasks here, ansible automatically loads them

main.yaml

vars --> variables required for this role

main.yaml

templates --> you can keep variables in the file, ansible replace the value at runtime.

any file

files --> We can keep files in this folder

any file names

Handlers --> notifiers when some change event is happened

defaults/ #

main.yml # <-- default lower priority variables for this role

meta --> dependencies of this role

main.yaml

library/ # roles can also include custom modules

An exception occurred during task execution. To see the full traceback, use -vvv. The error was: If you are using a module and expect the file to exist on the remote, see the remote_src option

fatal: [backend.daws82s.online]: FAILED! => {"changed": false, "msg": "Could not find or access 'backend.service'\nSearched in:\n\t/home/ec2-user/expense-ansible-roles/roles/backend/files/backend.service\n\t/home/ec2-user/expense-ansible-roles/roles/backend/backend.service\n\t/home/ec2-user/expense-ansible-roles/roles/backend/tasks/files/backend.service\n\t/home/ec2-user/expense-ansible-roles/roles/backend/tasks/backend.service\n\t/home/ec2-user/expense-ansible-roles/files/backend.service\n\t/home/ec2-user/expense-ansible-roles/backend.service on the Ansible Controller.\nIf you are using a module and expect the file to exist on the remote, see the remote_src option"}

ansible handlers are notifiers. when some change event happened in one task, we can trigger other tasks through handlers

3 components -> Mysql, backend and frontend

12 microservice

deployment

===========

there will be one folder where code exist

stop the server

remove old code

download new code

restart the server

1. remove directory

2. re create directory

3. download code

main.yaml

name

hosts

become

roles:

- frontend

roles/frontend

tasks

main.yaml --> install and service

How do you controll tasks in ansible.. few tasks should run, few tasks should not run...

ansible tags

100 covers white --> more, reliance, dmart