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Environment-Setup.md

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Environment Setup

Recommended Environment

  1. Master Node
    1. OS: RHEL8.5
    2. Memory: 2GB
    3. Ansible version 2.9
  2. Cloned Virtual Machines
    1. OS: CentOS Stream 8.5
    2. Memory: 1GB
    3. Quantity: 3x (or more)

Install and configure Ansible Control Node

Install required packages To be able to run Ansible, some packages are required:

  • OpenSSH-Server (should be installed by default)
  • Python3 (should be installed by default)
  • Ansible-Engine

Installing Ansible-Engine on RHEL 8.5

🖥️ at the prompt:

# these 3 commands maybe take a while to run 
sudo subscription-manager repos | grep -i ansible-2.9
sudo subscription-manager repos --enable ansible-2.9-for-rhel-8-x86_64-rpms
sudo dnf install ansible -y 

### Version check
ansible --version
ansible 2.9.27
  config file = /etc/ansible/ansible.cfg
  configured module search path = ['/home/ansible/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python3.6/site-packages/ansible
  executable location = /bin/ansible
  python version = 3.6.8 (default, Sep  9 2021, 07:49:02) [GCC 8.5.0 20210514 (Red Hat 8.5.0-3)]

Configure Ansible User with Sudo Access on Managed Node

  1. On each node include the master node create an ansible user. sudo useradd ansible sudo passwd ansible

  2. Create an ssh key on the master node and copy it to the managed nodes. Go through the defaults in the prompt by hitting 'enter'. No need to create a passphrase.

    1. On the master note: ssh-keygen
    2. Copy the key to managed nodes (provide node password): ssh-copy-id ansible@nodename

  3. Verify access through an ad hoc ping

    ansible all -m ping
# Successful Output
node1 | SUCCESS => {
    "ansible_facts": {
        "discovered_interpreter_python": "/usr/libexec/platform-python"
    },
    "changed": false,
    "ping": "pong"
}
node3 | SUCCESS => {
    "ansible_facts": {
        "discovered_interpreter_python": "/usr/libexec/platform-python"
    },
    "changed": false,
    "ping": "pong"
}
node2 | SUCCESS => {
    "ansible_facts": {
        "discovered_interpreter_python": "/usr/libexec/platform-python"
    },
    "changed": false,
    "ping": "pong"
}

Configure Vim for YAML Indenting and Vim Caching

This setup purely optional, but may improve your speed while taking the exam. YAML does not accept tabs, instead use 2 spaces. The best way to simplify this is to setup tabstops in your ~/.vimrc file to make this automatic.

📃 ~/.vimrc

set undofile 
set undodir="~/.vim/undo"

Make sure to create the undo directory.

🖥️ at the prompt: mkdir -p ~/.vim/undo

Alternative .vimrc Options

  • If you find the autocmd hard to remember you could specify instead: set tabstop=2 softtabstop=2

  • Ansible often gives line numbers in errors, so seeing them at a glance can help: set number will enable line numbers in files you're working on.