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Ansible tutorial: setup

To make the tutorial self-contained, a Vagrant file is provided. Vagrant makes it easy to bootstrap barebones virtual machines with VirtualBox.

Installing Vagrant

In order to run Vagrant, you need:

This should be all it takes to set up Vagrant.

Now bootstrap your virtual machines with the following command. Note that you do not need to download any "box" manually. This tutorial already includes a Vagrantfile to get you up and running, and will get one for you if needed.

vagrant up

and go grab yourself a coffee (note that if you use vagrant-hostmaster, you'll need to type your password since it needs to sudo as root).

If something goes wrong, refer to Vagrant's Getting Started Guide.

Cautionary tale about NetworkManager

On some systems, NetworkManager will take over vboxnet interfaces and mess everything up. If you're in this case, you should prevent NetworkManager from trying to autoconfigure vboxnet interfaces. Just edit /etc/NetworkManager/NetworkManager.conf (or whatever the NetworkManager config is on your system) and add in section [keyfile]:

unmanaged-devices=mac:MAC_OF_VBOXNET0_IF;mac:MAC_OF_VBOXNET1_IF;...

Then destroy Vagrant machines, restart NetworkManager and try again.

Adding your SSH keys on the virtual machines

To follow this tutorial, you'll need to have your keys in VMs root's authorized_keys. While this is not absolutely necessary (Ansible can use sudo, password authentication, etc...), it will make things way easier.

Ansible is perfect for this and we will use it for the job. However I won't explain what's happening for now. Just trust me.

ansible-playbook -i step-00/hosts step-00/setup.yml

If you get "Connections timed out" errors, please check the firewall settings of your machine.

If you get errors like:

fatal: [192.168.33.10]: UNREACHABLE! => {"changed": false, "msg": "host key mismatch for 192.168.33.10", "unreachable": true}

then you probably already have SSH host keys for those IPs in your ~/.ssh/known_hosts. You can remove them with ssh-keygen -R <IP_ADDRESS>.

Otherwise, just type yes when prompted to access ssh host keys if requested.

To polish things up, it's better to have an ssh-agent running, and add your keys to it (ssh-add).

NOTE: We are assuming that you're using Ansible version v2.5+ on your local machine. If not you should upgrade ansible to v2.5+ before using this repository (or run under virtualenv).

To check your ansible version use the command ansible --version. The output should be similar to the above:

ansible 2.10.5
  ...
  python version = 3.8.5 (default, Jul 28 2020, 12:59:40) [GCC 9.3.0]

Now head to the first step in step-01.