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Update CONTRIBUTING.md

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CONTRIBUTING.md
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@ -2,7 +2,7 @@ Contributing to Internet-in-a-Box (IIAB)
=======================================
Internet-in-a-Box runs on various GNU/Linux operating systems such as Fedora, Ubuntu, Debian, CentOS and Raspbian.
You can install Internet-in-a-Box on most late model desktop and laptop computers. It also supports Intel NUC, Intel Gigabyte BRIX, OLPC XO-1.5, XO-1.75, XO-4, Raspberry Pi 2 and Raspberry Pi 3. A VirtualBox VM can also used for testing purposes. Using Docker containers however is not recommended as our Ansible provisioning system requires low-level access to the operating system.
You can install Internet-in-a-Box on x86_64 PCs/laptops and Raspberry Pi 3 (or 3 B+). Example PC's include Intel NUC and Gigabyte BRIX. Partial support is also available on OLPC laptops like the XO-1.5, XO-1.75 and XO-4. A VirtualBox VM can also used for testing purposes. Using Docker containers however is not recommended as our Ansible provisioning system requires low-level access to the operating system. Finally, running Internet-in-a-Box on the Raspberry Pi Zero W is also possible, if you transfer a working IIAB (microSD card) that was built up inside a Raspberry Pi 3.
Please refer to [IIAB Platforms](https://github.com/iiab/iiab/wiki/IIAB-Platforms) for more information.
@ -11,12 +11,12 @@ Internet-in-a-Box uses [Ansible](https://www.ansible.com/) infrastructure automa
├── roles
│ ├── 1-prep
│ │ ├─ defaults
| | | ├──main.yml (lowest precedence variable definitions, overridden by <repo_root>/vars/default_vars.yml, overridden by ./vars/local_vars.yml.
| | | ├──main.yml (lowest precedence variable definitions, overridden by <repo_root>/vars/default_vars.yml, overridden by /etc/iiab/local_vars.yml)
│ │ ├── README.rst
│ │ ├── tasks
| | | ├──main.yml (specifies the actions to install this role
│ │ └── templates
| | | ├<(text files where ansible variables are substituted, specified via {% <variable> %} containers-(jinja2 language).
| | | ├──<text files where ansible variables are substituted, specified via {% <variable> %} containers-(jinja2 language)>
│ ├── 2-common
│ │ ├── README.rst
│ │ ├── tasks
@ -24,11 +24,11 @@ Internet-in-a-Box uses [Ansible](https://www.ansible.com/) infrastructure automa
```
At runtime, Ansible gathers system information and makes it available (called 'facts') and combines this with playbook defined 'variables' to guide the installation process. The execution follows a sequence of cascading steps:
1. Bash script `./runansible` follows instructions in `iiab.yml` in the root directory.
1. Bash script `./iiab-install` follows instructions in `iiab-stages.yml` in the root directory.
2. `iiab.yml` calls 9 aggregate roles (the numbered directories under `./roles/`).
2. `iiab-stages.yml` calls 9 aggregate roles (AKA stages, these are the numbered directories under `./roles/`) and then the network role. (Aside: the network role can also later be run using `./iiab-network`)
3. Each aggregate role has a `<role>/meta/main.yml` which calls the individual named roles.
3. Each aggregate role AKA stage has a `<role>/meta/main.yml` which calls its needed roles.
Please refer to the [IIAB Architecture](https://github.com/iiab/iiab/wiki/IIAB-Architecture) and [IIAB Variables]( https://github.com/iiab/iiab/wiki/IIAB-Variables) pages for more information.