DevOps Classroom Series – 06/May/2021

Ansible Contd..

• Ansible Control Node requirements:
  • OS:
    • Linux flavours => RedHat, Ubuntu, CentOS, any of BSD’s
    • Mac
  • Software:
    • Python 2
    • Python 3
• Lets create a ubuntu 18 VM as node
• Ansible Node requirements
  • SSH should be running
  • Python should be installed
  • SFTP/SCP should be configured
• Now lets try to verify the connectivity using ansible b/w control node and node
• First lets create a simple inventory

172.31.7.136
# echo "172.31.7.136" > inventory

• Now ensure you have private key (pem) file in the Ansible control node and permissions are set
• Lets look at a simple ansible ping command which verifies if your control node can access nodes or not

ansible -i <inventory> -m ping all

• We also need to specify the username and pem file (private key file)
• So now lets add a new centos 7 VM

How to make ansible work towards our deployments

• Pictorial Representation
• In Ansible the atomic unit of work is module. Ansible has lot of inbuilt modules to help us automate our infra needs
• Refer Here for the list of all the modules supported by ansible
• Our approach to use Ansible
  • Make a list of all the steps needed to deploy your application
  • for every step try to find the ansible module which can help in expressing a desired state.

Exercise

• Learn about YAML Refer Here