The power of Ansible comes in being able to remotely manage a fleet of servers.
For that to happen though we need to first configure our managed nodes. In this lab we’ll practice configuring these nodes.
*This course is not approved or sponsored by Red Hat.*
Learning Objectives
Successfully complete this lab by achieving the following learning objectives:
- Set up the Ansible Inventory
We need to make sure Ansible has the new servers in its inventory.
Edit/etc/ansible/hostsand add lines similar to the following:[webservers] WebServer1 [dbservers] DBServer1 [admins] AdminServer1- Set up Passwordless SSH Between Nodes
Note that we already have a SSH key in root’s .ssh directory. We don’t have to
create a new one though. Let’s just re-use what we have.Copy that key to one of the new servers:
ssh-copy-id ansible@WebServer1Put in the password and the key will be copied over. Repeat this with the other
two servers.- Configure Passwordless Privilege Escalation
Connect to
WebServer1ascloud_user. From there, usesudoto escalate and haverootprivileges.As
root, runvisudo. Addansible ALL=(ALL) NOPASSWD: ALLto the end of the file.Repeat this on the other two servers.
- Ensure Correct Configuration
Make sure that everything was done correctly by running
ansible all -m ping --becometo
have Ansible attempt to connect to all the other servers and escalate privileges.
