ansible

Ansible: A CM Tool and the latest version of 6.0

Ansible 6.0 is Python3 based and installation of Python 3 is needed

Inventory : This is the file which we supply ansible the list of DNS names or IP's on the machine that you would like to do that configuration management.

The default group in this file is 'all' which is included all the DNS or IP's that you supplied

• Manual way : Executing the commads and can work one command at a time
• Automated wat - Using Ansible Playbook

Samble Ansible Manual Command

ansible all -i inv -e ansible_user=centos -e ansible_password=DevOps321 -m shell -a uptime

-i : Inventory file all : Group Name ansible_user : Username which ansible uses for authentication ansible_password : Password which ansible uses for authentication -m : Module -a : Argument -e : Extra Arguments

PS : ansible --help gives all the latest and greates option of that time

Pre-Requisites:

The very first thing to ensure that ANSIBLE works is : SSH your ansible should be able to ssh to the enteries mentioned in your inventory file.

Manual Command

ansible dev -i inv -e ansible_user=centos -e ansible_password=DevOps321 -m shell -a uptime

Playbooks is nothing but your ansible scripts which are writted on YAML

YAML : This is just a Markup language ( Markup language is nothing but presentation laguage)

Abbrevation of YAML : yet another markup language

YAML Basics :

* Dictionary : A key value pair is called as dictionary
* List        : A key with multiple values is called as a list ( when we use list iy has to start with -)
* Map         : A key with multiple key value pairs is referred as MAP

PS : YAML is intendation specific ( Spacing Matters)

| indicates multi line input

What is a Playbook in ansible ??

Playbook is a list of plays What is a Play? A Play is a list of tasks What is a Task? A Task is an action or actions that you wish to do

Ansible playbooks should always end with .yml or .yaml. Anything apart from that won't be considered.

How to run the Ansible play book?

ansible-playbook -i inv -e ansible_user=centos -e ansible_password=DevOps321 01-sample.yml

ansible-playbook -i inv -e ansible_user=centos -e ansible_password=DevOps321 -e COMPONENT=catalogue roboshop.yml

When to use remote_src

When we say remote_src yes the download happens on the remote machine. If this is not mentioned download happens on the same machine on which we run the command.

How do you prevent a service from restarting?

We use handlers to perform this

FOR LOOP

To run a loop we use FOR loop

for i in mongodb catalogue redis cart user mysql shipping frontend; do ansible-playbook -i inv -e ansible_user=centos -e ansible_password=DevOps321 -e COMPONENT=$i roboshop.yml; done

With Environments

git pull ; for i in mongodb catalogue redis cart user mysql shipping rabbitmq payment frontend; do ansible-playbook -i dev-inv -e ansible_user=centos -e ansible_password=DevOps321 -e ENV=dev -e COMPONENT=$i roboshop.yml; done

for i in mongodb catalogue redis mysql cart frontend ( Any component can be mentioned here)

Catalogue component's dependency is MongoDB -- It can be done using meta argument inside the meta argument. Meta argument helps you always in creating such dependencies.

Ansible-Pull

for Ansible pull to work you need to ensure that the machine which executes gthe pull command has Ansible Installed on the machine.

Install Ansible: curl https://gitlab.com/thecloudcareers/opensource/-/raw/master/lab-tools/ansible/install.sh | sudo bash

---

--- ansible-pull -U https://github.com/aws-clouddevops/ansible.git -e COMPONENT=frontend -e ENV=dev roboshop-pull.yml

ANSIBLE TAGS

ansible-playbook 13-tags.yml --skip-tags web ansible-playbook 13-tags.yml -t web

TEST COMMITS FOR ANSIBLE PULL

Ansible pull needs anisble to be installed.

How to create and AMI with ansible

1. Launch the machine with our lab image
2. Install ansible with curl command and also install boto : $ sudo pip3 install boto
3. Once Installed , make an AMI and ensure that comes to available state
4. Going forward for all the machines that needs ansible use this AMI.
5. Which will be having ANSIBLE installed on it.