Ansible Configuration

• We have two linux machines with a user called as devops with sudo permissions and NOPASSWD
• Ansible control node needs to have the information about the nodes which are attempting to connect. This information is referred to as inventory.
• Now we have executed the ansible basic command after creating the inventory Refer Here for the inventory and the command used. We got the following error
  
• To add the known-host entry lets manually login from ansible control node to node using ssh command
  
• Right now we are entering the password manually when connecting to the nodes which is not good for automation, So lets create a secure approach, which enables password less authentication with security
• Now on the ansible control node, i will be create a key pair

ssh-keygen

* Now lets copy the key from ansible control node to node 1 so that we can use key based authentication.

ssh-copy-id username@<destination-node-ip>

* Now lets try logging in into node1 without password

* Now lets exit and retry the command without password option Refer Here

* Now lets add localhost to the inventory Refer Here and run the ansible ping command

* It fails on localhost as the key is not copied, so copy the key using ssh-copy-id

• Overview of the Steps
  

From ansible I want to deploy an application into Linux Server

• Deployment Statements
  • I want to deploy a spring boot application into ubuntu linux server and ensure the service is configured and running on port 8080.
  • I want to deploy an node js application on the Linux Server and configure nginx to forward the requests to nodejs
  • I want to deploy a postgresql database on the linux server
• Steps to Resolve this
  • Understand the Manual steps to acheive and try to execute them once before you start any automation with any tool in this case it is Ansible.
• Yaml Tutorial: Refer Here