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Add quick explanation on how it works

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Khue Doan 2021-06-05 03:21:44 +07:00 committed by GitHub
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## Architecture
Quick explanation on how it works (currently just my quick brain dump because more people is visiting the repo):
- Enter the tools container, which contains all the neccessary tools (see building instruction bellow)
- Run `make`
- Ansible will render the configuration file for each bare metal machine (like IP, hostname...)
- The tools container will create sibling containers to build a PXE server (includes DHCP, TFTP and HTTP server)
- Ansible will wake the machines up using Wake on LAN
- The machine start the boot process:
- BIOS boot in network mode and look for DHCP server
- DHCP server point it to the TFTP server to get boot files and boot config
- The boot config contains parameter to get automated OS installation config file (for example kickstart on CentOS or Fedora)
- The OS get installed and the machine reboots to the new operating system
- Terraform will create a Kubernetes cluster
- ArgoCD will install the applications
| Layer | Name | Description | Provisioner |
|-------|------------------------|---------------------------------------------------------|---------------------|
| 0 | [metal](./metal) | Bare metal OS installation, Terraform state backend,... | Ansible, PXE server |