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20160510 Coreosfest notes 1

20160510_Coreosfest_notes-1

CoreOS Bootstraping

1 - coreos-baremetal

Overview

https://github.com/coreos/coreos-baremetal

Coreos-baremetal:
* Guides
* 1 service (bootcfg)

bootcfg:
* Network boot config
* Provisioning CoreOS clusters
* Metadata

coreos-baremetal/bootcfg

https://github.com/coreos/coreos-baremetal/blob/master/Documentation/bootcfg.md

HTTP server
* iPXE scripts (Kernel + Initrd)
* Ignitions / cloud-config config files (Bootstraping)
* Metadata / Logic

/var/lib/bootcfg/
 |
 ├── assets/
 |   └── coreos
 |        └── VERSION
 |            ├── coreos_production_pxe.vmlinuz
 |            └── coreos_production_pxe_image.cpio.gz
 |
 |
 |   // Network boot config
 ├── groups/
 │   └── default.json
 │   └── node1.json
 │   └── us-central1-a.json
 |
 └── profiles/
 │   └── etcd.json
 │   └── worker.json
 |
 |
 |   // CoreOS Config specific
 ├── cloud
 │   ├── cloud.yaml
 │   └── worker.sh
 └── ignition
     └── hello.json
     └── etcd.yaml
     └── simple_networking.yaml
  • Groups
  • 1 Profile
  • 1 Selector (HW / Metadata logics)

  • Metadata associated for Profile templating

  • Profil

  • Ignition / cloud-config
  • Network BOOT args (iPXE)

Network Environment setup

  • NO DHCP
  • NO TFTP

=> Use DNSMasq

2 - Tests

Infra setup

  • 1 CoreOS VM
  • BootCFG HTTP servers

  • Dnsmasq DHCP/TFTP server

  • 1 VBox VM PXE Boot

Bootcfg API

https://github.com/coreos/coreos-baremetal/blob/master/Documentation/api.md

=> Allow to validate each part of Bootcfg
* ipxe / ipxe script
* Ignition Config
* Metadata
* Images