uncloud-mravi/doc/README-identifiers.org

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* Identifiers
** Problem description
Identifiers can be integers, strings or other objects. They should
be unique.
** Approach 1: integers
Integers are somewhat easy to remember, but also include
predictable growth, which might allow access to guessed hacking
(obivously proper permissions should prevent this).
** Approach 2: random uuids
UUIDs are 128 bit integers. Python supports uuid.uuid4() for random
uuids.
** Approach 3: IPv6 addresses
uncloud heavily depends on IPv6 in the first place. uncloud could
use a /48 to identify all objects. Objects that have IPv6 addresses
on their own, don't need to draw from the system /48.
*** Possible Subnetworks
Assuming uncloud uses a /48 to represent all resources.
| Network | Name | Description |
|-----------------+-----------------+----------------------------------------------|
| 2001:db8::/48 | uncloud network | All identifiers drawn from here |
| 2001:db8:1::/64 | VM network | Every VM has an IPv6 address in this network |
| 2001:db8:2::/64 | Bill network | Every bill has an IPv6 address |
| 2001:db8:3::/64 | Order network | Every order has an IPv6 address |
| 2001:db8:5::/64 | Product network | Every product (?) has an IPv6 address |
| 2001:db8:4::/64 | Disk network | Every disk is identified |
*** Tests
[15:47:37] black3.place6:~# rbd create -s 10G ssd/2a0a:e5c0:1::8