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Task #6869

Updated by Nico Schottelius 4 months ago

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h2. Introduction

For proper growth and stability, we need to challenge our setup. We will try to replace opennebula with ucloud and at the same time challenge OpenStack.

This is not only a technical, but also a public project, which Sanghee will write the public story of.

ucloud supports IPv6 first and might only support IPv4 via NAT64 or proxying.

h2. General Requirements:

* a fully portable cloud management system that is API based, exposes all internals w/o secret keys
** supporting console via guacamole
** users in ldap
** api authentication in ungleich-otp
** firewalling in ufirewall (or similar)
* A great team
* To be built in less than 100 days

h2. Technology stack

* python3
** easy to read
* flask
** easy to understand
* ldap
** well known
* ungleich-otp
** for API authentication
* etcd
** storing VMs, networks, etc.
* nft (Linux), pf (BSD)
* JSON
** describing the data, easy to handle
* Prometheus
** For monitoring hosts and VMs
* VXLAN
** For networks

h2. Technical requirements

* ucloud should be portable
** While the primary target is Linux, it should run on FreeBSD/OpenBSD as well
* There should be no single point of failure
** APIs should be announced via BGP to the routers
** Switches will then use ECMP to load balance
** All APIs write to a distributed data store (v1: etcd) -> all data is distributed, too.
* Fast dead host detection
** Dead hosts should be detected fast, VMs should be rescheduled fast

h2. Components

h3. Scheduler

The scheduler knows about hosts, their capacities and their usage. The scheduler decides which VM gets scheduled where. The scheduler is also responsible for rescheduling VMs (f.i. due to another host becoming better for a specific VM).

h3. VM manager

Starts and stops VMs. Reacts on information from the scheduler. This component needs to support qemu on Linux and bhyve and co. on OpenBSD/FreeBSD.

h3. Network manager

Creates and manages virtual layer 2 networks. Basically does the following:

* Create VXLAN with correct IPv6 multicast address

h3. IPAM

Network address manager. Provides dhcpd/dhcp6d/router advertisements.

h3. Legacy IP supporter Metadata

For Provides access to to

* public ssh keys
* other data
users who require legacy IP (IPv4), add a

provide

h3. Firewall

The VMs should not be able to interfere with other VMs or hosts in a malicious way. The following protective measures need to be implemented:

* prevent dhcpd answers in public networks
* prevent router advertisements in public networks
* prevent VM from using incorrect mac address
* prevent VM from using incorrect ipv6 addresses



Note to Nico: ping reyk for possible involvement

h3. Metadata

Provides access to to

* public ssh keys
* other data users provide

h3. Payment service

If a user requests a service and the service is not free, the user will be asked to pay for it.

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