Ansible101

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This demo is designed to demostrate Ansible basics.

It consists of the following files:

• Dockerfile - to build docker images for control and host nodes
• Makefile - for operations listed below
• play/myhosts - inventory file
• play/site.yml - sample playbook

The Makefile can be used for the following operations:

1. build docker image for control node - make control
2. build docker image for host node - make host
3. spawn control and host nodes - make spawn
4. list the running containers - make list
5. exec into the control node - make exec_control
6. exec into the host01 - make exec_host01
7. exec into the host02 - make exec_host02
8. delete the containers - make clean

After the setup is completed, add ssh key from the control node cat ~/.ssh/id_rsa.pub to the host nodes ~centos/.ssh/authorized_keys to authorize the control node to ssh to the host nodes.

Exercises:

1. Test if the control node can ssh into the host nodes, ansible all -i myhosts -m ping
2. Run the supplied playbook, ansible-playbook -i myhosts site.yml
3. Run Ad-Hoc command to verify the package has been installed ansible all -i myhosts -m command -a "rpm -q sysstat"
4. Change the playbook to ensure the package is removed, sed -i -e 's/state: latest/state: absent/' -e 's/ensure.*/ensure sysstat is removed/' site.yml
5. Run the playbook again: ansible-playbook -i myhosts site.yml
6. Verify the package has been removed, ansible all -i myhosts -m command -a "rpm -q sysstat"