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Mike Zeller <[email protected]>
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RFD 107 Self assigned IP's and reservations

Problem Statement

Since the introduction of Fabric Networks users have far longed for a truly self service experience when it comes to networking. We often encounter users requesting the ability to self assign IPs on their networks to specific zones. Currently NAPI allows for this but it is not exposed to end users via CloudAPI. In addition to assigning IP's, users should also be able to reserve IP's.

Common scenarios leading to the need for self assigned IP's

This section describes some known customer scenarios.

  1. Fabric routes cannot be updated after creation.

    In our current situation NAPI via CloudAPI allows users to create a fabric network with a route object. This route object will apply the defined routes to new zones when they are created on the fabric. However, until rfd 28 is implemented there is no way for a user to update the route object on a fabric. Even if the route object was updated the new routes would not be synced to exisiting zones. This often leads to users wanting to manage their own route tables on zones via a tool like ansible (chef, salt, puppet etc). It often makes sense for them to want to be able to manage where IP's land, especially when recreating an instance used as a vpn or IPSec host.

  2. Mirroring deployments across Datacenters.

    Customers sometimes wish to deploy identical environments to multiple datacenters for a variety of reasons such as disaster recovery or failover. Being able to mirror the IP mappings across the datacenters lightens the Ops load when working with configuration management as well as simplifying the environments overall.

  3. Routing tables cannot take advantage of CNS.

    Most of the time users don't have to worry about managing IP's when they take advantage of CNS. We often recommend that users use CNS's ability to group instances by service label/tag. Then applications and end users can consume the services via DNS based lookups. However, this approach falls short when the user needs to add a particular service to a routing table e.g. vpn's, and zones acting as routers between networks. Recreation of one of these types of zones means new IP's which also means the users need to update all routing tables everywhere in addition to updating and configuration management scripts they have in place.

Proposed Solution

The solution needs to handle both the CloudAPI/Portal as well as the Docker interface into Triton. NAPI currently allows the assigning of an IP on a network which is documented here. In the future, when a Triton user wants to specify a specific IP address they will need to pass in the desired network UUID and ip as an object. However, in our current API deployment you can only pass in the desired network UUID. To address this issue we will need to modify VMAPI.

VMAPI changes

tl;dr No changes will be made to VMAPI for this RFD. Some notes below about future directions.

The VMAPI endpoint already accepts a new Network Object type that is outlined here, in addition to being backwards compatible with a list of network UUID's.

Network Object

IPv4

Field Type Description
ipv4_uuid UUID UUID of network.
ipv4_count Number Number of IPs on network. (Default 1; omit if using ipv4_ips)
ipv4_ips Array Array of IP's.

Each network object represents one interface. Currently this interface supports only IPv4, as well as a count of 1 or a single IP address. In the future an interface will be able to support multiple IP's (i.e. "ipv4_count": 2) in addition to multiple networks, but that is beyond the scope of this proposal.

[
  { "ipv4_uuid": "58f75b3e-15aa-4bab-ad22-c6546cfd6b59" },
  { "ipv4_uuid": "458827a7-dd75-4157-8184-0e38bd97177f", "ipv4_count": 1 },
  { "ipv4_uuid": "72a9cd7d-2a0d-4f45-8fa5-f092a3654ce2", "ipv4_ips": ["192.168.1.234"] }
]

//Not yet supported
[
  { "ipv4_uuid": "01b2c898-945f-11e1-a523-af1afbe22822", "ipv4_ips": [ "10.0.1.78", "10.0.1.88" ] },
  { "ipv6_uuid": "d1516824-ece0-46d0-bbe1-87a120268d16", "ipv6_count": 2 },
]

The ongoing IPv6 work as well as RFD 32 Multiple IP Addresses in NAPI may introduce additional changes to VMAPI at some point in the future.

primaryIp changes

The primaryIp is a fiction from CloudAPI's point of view. It is commonly used by customers to determine what IP they should SSH in on. Historically it has defaulted to a public IP. We should tell users to rely on CNS for this purpose, however there may be some users who do not enable CNS for their accounts. When a user sets the primaryIp we really want the NIC to be primary, not the IP specified. When a NIC is primary it effects things like default route for the instance. For more information check out PUBAPI-1216. This becomes important when we start allowing users to have multiple IPs attached to the same NIC.

CloudAPI changes

CloudAPI should expose endpoints to allow users to self assign and reserve IP's specifically on a non-public network. The endpoints should look something like this.

Nics

AddNic (POST /:login/machines/:id/nics)

Until we have support for multiple IPs per NIC, CloudAPI will restrict requests to only allow a count of 1 and an ips array with a single element. It is also still possible to pass in just a network UUID.

input

A single network object.

Field Type Description
ipv4_uuid UUID Network UUID
ipv4_ips Array Specific IPs to assign to the NIC. Optional
ipv4_count Integer Number of IP's wanted. Optional (not needed if ipv4_ips is provided) 
{ "ipv4_uuid": "72a9cd7d-2a0d-4f45-8fa5-f092a3654ce2" }

or

{
  "ipv4_uuid": "72a9cd7d-2a0d-4f45-8fa5-f092a3654ce2",
  "ipv4_ips": ["192.168.1.234"]
}
output
Field Type Description
ip String NIC's IP Address
mac String NIC's Mac Address
primary Boolean Whether this is the instance's primary NIC
netmask String IP netmask
gateway String IPv4 gateway
state String Describes the state of the NIC (most likely 'provisioning')
network String Network UUID
errors
Error Code Description
ResourceNotFound If :login or :id does not exist
InvalidArgument If :id isn't a UUID, the network argument isn't a valid UUID, or the IP isn't valid
MissingParameter If the network argument isn't present

This future-proofs us for the additional ongoing work mentioned above, allowing to data to eaisly map to any VMAPI changes.

Networks

There are some fields returned in ListNetworkIPs and GetNetworkIP that are only displayed under certain conditions.

  • ip: always displayed

  • reserved: always displayed

  • managed: always displayed

  • owner_uuid: displayed only if the ip address has a belongs_to_uuid field, and uuid is not the admin uuid.

  • belongs_to_uuid: displayed only if the ip is allocated to "something"1 AND the owner_uuid matches the user making the request.

    [1] Currently in Triton "something" can refer to "zone", "server", or "other". NAPI lists this type in belongs_to_type. We would like to expose this type information in the future, and possibly extend the values in the field to be more meaningful such as "nat", "nfs", or "router"

ListNetworkIPs (GET /:login/networks/:id/ips)

Only provisioned and reserved IP's will be returned. In addition users will be able to list IPs on any network they are an owner of as well as public networks. On public networks, only the users provisioned IPs will be returned. In order to support listing a public networks IPs we will have to add the owner_uuid filter to the NAPI request. This means CloudAPI will have a requirement on minimum NAPI version.

output

Returns and array of provisioned or reserved IP objects.

Field Type Description
ip String IP Address
reserved Boolean Whether this IP is reserved or not
managed Boolean True if the user cannot modify the IP via UpdateNetworkIP (example broadcast and gateway IPs)
owner_uuid String Optional owner UUID of the instance the IP is associated with
belongs_to_uuid String Optional UUID of the instance the IP is associated with
output (example)
GET /:login/networks/b330e2a1-6260-41a8-8567-a8a011f202f1/ips
[
 ...... elided
  {
    "ip": "10.88.88.105",
    "reserved": true,
    "managed": false
  },
  {
    "ip": "10.88.88.106",
    "reserved": false,
    "belongs_to_uuid": "0e56fe34-39a3-42d5-86c7-d719487f892b",
    "owner_uuid": "7dfbbcda-4f62-cdf8-df31-d1e4d8d34c5e",
    "managed": false
  }
 ...... elided
]
errors
Error Code Description
ResourceNotFound If :login or :id does not exist
GetNetworkIP (GET /:login/networks/:id/ips/:ip_address)
output
Field Type Description
ip String IP Address
reserved Boolean Whether this IP is reserved or not
managed Boolean True if the user cannot modify the IP via UpdateNetworkIP (example broadcast and gateway IPs)
owner_uuid String Optional owner UUID of the instance the IP is associated with
belongs_to_uuid String Optional UUID of the instance the IP is associated with
output (in use)
GET /:login/networks/b330e2a1-6260-41a8-8567-a8a011f202f1/ips/10.88.88.106

{
  "ip": "10.88.88.106",
  "reserved": false,
  "belongs_to_uuid": "0e56fe34-39a3-42d5-86c7-d719487f892b",
  "owner_uuid": "7dfbbcda-4f62-cdf8-df31-d1e4d8d34c5e",
  "managed": false
}
output (not in use)
GET /:login/networks/b330e2a1-6260-41a8-8567-a8a011f202f1/ips/10.88.88.105

{
  "ip": "10.88.88.105",
  "reserved": true,
  "managed": false
}
errors
Error Code Description
ResourceNotFound If :login or :id does not exist
UpdateNetworkIP (PUT /:login/networks/:id/ips/:ip_address)

It is worth noting that when you delete an instance that has a reserved IP the IP will remain reserved. This means that the IP will not be in the allocation pool of possible IPs when creating another instance.

input
Field Type Description
reserved Boolean Reserve/Unreserve the IP 
{ "reserved": true }
output
Field Type Description
ip String IP Address
reserved Boolean Whether this IP is reserved or not
managed Boolean True if the user cannot modify the IP via UpdateNetworkIP (example broadcast and gateway IPs)
owner_uuid String Optional owner UUID of the instance the IP is associated with
belongs_to_uuid String Optional UUID of the instance the IP is associated with
errors
Error Code Description
ResourceNotFound If :login, :id, or :ip_address does not exist
MissingParameter ip and or reserved are not set
InvalidArgument trying to modify a triton_reserved ip

Instances

CreateMachine (POST /:login/machines)

The only change here is to the networks array, it is now an array of objects. CloudAPI will also still accept an array of network UUID strings.

input
Field Type Description
...
networks Array Array of network objects
... 
"networks": [
  { "ipv4_uuid": "58f75b3e-15aa-4bab-ad22-c6546cfd6b59" },
  { "ipv4_uuid": "72a9cd7d-2a0d-4f45-8fa5-f092a3654ce2", "ipv4_ips": ["192.168.1.234"] }
]

See the relevant notes in the AddNic section.

Docker Changes

There are no changes to VMAPI planed for this RFD. There should be no changes in how docker operates for the time being.