rmb938 / vmw-cloudinit-metadata

Library and Tool to run a Cloud-Init NoCloud compatible metadata server for VMWare VCenter

vmw-cloudinit-metadata

Library and Tool to run a Cloud-Init NoCloud compatible metadata server for VMWare VCenter

VSPC

The application uses serial ports on virtual machines configured to use the network, with the direction configured to client, the port uri configured to any string and the vSPC URI configured to telnet://$ADDRESS:13370

Usage

vmw-cloudinit-metadata run --uri my-metadata --driver vmw_cloudinit_metadata.drivers.file:FileDriver --driver-opts '{"directory": "/some/directory/here"}'

Drivers

The application can use various different drivers to load cloud-init metadata.

Custom drivers can be made by implementing the vmw_cloudinit_metadata.drivers.driver:Driver interface.

File Driver

The file dirver looks in the given path for yaml files with the name of the VM.

Options

directory - path to yaml definition files

Example

my-vm.yaml

---
metadata:
  ami-id: my-image
  instance-id: my-instance
  region: us-east1
  availability-zone: us-east1-a
  tags:
    - a
    - b
    - c
  public-keys:
    - ssh....
  hostname: myhostnamehere
network:
  address: 192.168.1.1
  netmask: 255.255.255.0
  gateway: 192.168.1.254
  search: 'example.com'
  nameservers:
    - 8.8.8.8
    - 8.8.4.4
userdata: |
  #cloud-config
  growpart:
    mode: auto
    devices: ['/']
    ignore_growroot_disabled: false

Serial Communication

All serial communication is done using "packets". All packets start with the string !! followed the by packet code, then the symbol # followed by base64 encoded data.

The data returned is compatible with Cloud-Init NoCloud

Example

Client Sends

!!REQUEST_METADATA#

Server Response

!!RESPONSE_METADATA#ew0KICAgICJhbWktaWQiOiAibXktaW1hZ2UiLA0KICAgICJpbnN0YW5jZS1pZCI6ICJteS1pbnN0YW5jZSIsDQogICAgInJlZ2lvbiI6ICJteS1yZWdpb24iLA0KICAgICJhdmFpbGFiaWxpdHktem9uZSI6ICJteS16b25lIiwNCiAgICAidGFncyI6IFsiYSIsICJiIiwgImMiXSwNCiAgICAicHVibGljLWtleXMiOiBbDQogICAgICAgICJwdWJsaWMtc3NoLWtleS1oZXJlIg0KICAgIF0sDQogICAgImhvc3RuYW1lIjogIm15LWhvc3RuYW1lIiwNCiAgICAibG9jYWwtaG9zdG5hbWUiOiAibXktaG9zdG5hbWUiDQp9

After decoding the base64 data the response contains the following:

{
  "ami-id": "my-image",
  "instance-id": "my-instance",
  "region": "my-region",
  "availability-zone": "my-zone",
  "tags": ["a", "b", "c"],
  "public-keys": [
    "public-ssh-key-here"
  ],
  "hostname": "my-hostname",
  "local-hostname": "my-hostname"
}

Packets

REQUEST_METADATA

Client requests instance metadata

REQUEST_NETWORKDATA

Client requests instance network data

REQUEST_USERDATA

Client requests instance user data

RESPONSE_METADATA

Server responds with instance metadata

Example:

{
  "ami-id": "my-image",
  "instance-id": "my-instance",
  "region": "my-region",
  "availability-zone": "my-zone",
  "tags": ["a", "b", "c"],
  "public-keys": [
    "public-ssh-key-here"
  ],
  "hostname": "my-hostname",
  "local-hostname": "my-hostname"
}

RESPONSE_NETWORKDATA

Server responds with instance networkdata

Example:

version: 1
config:
- type: physical
  name: eth0
  subnets:
  - type: static
    address: 192.168.1.1
    netmask: 255.255.255.0
    gateway: 192.168.1.254
    dns_search:
    - example.com
    dns_nameservers:
    - 8.8.8.8
    - 8.8.4.4

RESPONSE_USERDATA

Server responds with instance userdata

Example:

#cloud-config
growpart:
  mode: auto
  devices: ['/']
  ignore_growroot_disabled: false