[#114] nns: Add docs

Signed-off-by: Alexander Chuprov <a.chuprov@yadro.com>
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Alexander Chuprov 2024-09-27 17:51:29 +03:00
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# Globally unique domain zone
**Make sure you understand the [basic concepts](../nns/README.md) of `NNS`.**
`Globally Unique Domains Zone` (`GUDZ`) is an extension of `NNS` that ensures unique names across multiple domain zones. When this option is enabled, all newly created domains will automatically receive a corresponding alias in the designated global zone. Deleting a domain will also remove its alias from the global zone.
It's important to note that this feature is not retroactive: domains created before this option is enabled will not receive a global alias. Likewise, if the option is later disabled, domains that already have a `GUDZ` alias will retain their records. To fully disable `GUDZ`, all domains must be recreated with the option turned off.
To enable `GUDZ`, add a `cnametgt=$(global domain)` `TXT` record that specifies the global zone.
**Example:**
Domains:
- `poland`
- `sweden`
- `animals.org`
It is necessary to associate the domain zones `.poland` and `.sweden` into the global zone `.animals`.
![](img/GUDZ.png)
Create domains:
```
frostfs-adm morph nns register --name="poland" --email="email@email.email"
frostfs-adm morph nns register --name="sweden" --email="email@email.email"
frostfs-adm morph nns register --name="org" --email="email@email.email"
frostfs-adm morph nns register --name="animals.org" --email="email@email.email"
```
Add the `cnametgt` records:
```
frostfs-adm morph nns add-record --name="poland" --data="cnametgt=animals.org" --type="txt"
frostfs-adm morph nns add-record --name="sweden" --data="cnametgt=animals.org" --type="txt"
```
Create a domain with mapping to the global zone:
```
frostfs-adm morph nns register --name="bober.poland" --email="email@email.email"
```
Add any `TXT` record
```
frostfs-adm morph nns add-record --name="bober.poland" --data="CID" --type="txt"
```
Verify that the created domain has alias in the global zone
```
frostfs-adm morph nns tokens -v
balance.frostfs
animals.org
group.frostfs
container
org
container.frostfs
proxy.frostfs
policy.frostfs
alphabet0.frostfs
sweden
frostfsid.frostfs
bober.animals.org (CNAME: bober.poland)
netmap.frostfs
frostfs
poland
bober.poland
```
Create of a conflicting domain
```
frostfs-adm morph nns register --name="bober.sweden" --email="email@email.email"
unable to register domain: script failed (FAULT state) due to an error: at instruction 1263 (THROW): unhandled exception: "global domain is already taken: bober.animals.org. Domain: bober.poland
```
**Disable GUDZ**
Delete `cnametgt` records
```
frostfs-adm morph nns delete-records --type=txt --name=poland
```
Create `hamster.poland` and `hamster.sweden`
```
frostfs-adm morph nns register --name="hamster.poland" --email="email@email.email"
frostfs-adm morph nns register --name="hamster.sweden" --email="email@email.email"
```
`hamster.poland` and `hamster.sweden` does not have alias
```
frostfs-adm morph nns tokens -v
balance.frostfs
animals.org
group.frostfs
container
org
container.frostfs
proxy.frostfs
policy.frostfs
alphabet0.frostfs
sweden
frostfsid.frostfs
bober.animals.org (CNAME: bober.poland)
netmap.frostfs
frostfs
poland
bober.poland
hamster.poland
```
Delete global alias of `bober.poland`
```
frostfs-adm morph nns delete-records --name="bober.poland" --type="txt"
```
```
frostfs-adm morph nns tokens -v
balance.frostfs
animals.org
group.frostfs
container
org
container.frostfs
proxy.frostfs
policy.frostfs
alphabet0.frostfs
sweden
frostfsid.frostfs
netmap.frostfs
frostfs
poland
bober.poland
hamster.poland
```
Delete `bober.poland`
```
frostfs-adm morph nns delete --name="bober.poland"
```
```
frostfs-adm morph nns tokens -v
balance.frostfs
animals.org
group.frostfs
container
org
container.frostfs
proxy.frostfs
policy.frostfs
alphabet0.frostfs
sweden
frostfsid.frostfs
netmap.frostfs
frostfs
poland
hamster.poland
```

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# NNS
NNS - Neo Name Service is a service that allows manage a domain name as a digital asset (NFT). It has an interface similar to `DNS` but has significant differences in its internal structure.
## Entities:
- Domain
- Record
- Owner
- Committee
### Domain
Domain is string that satisfies the following requirements:
- Length from 2 to 255 characters.
- Root domain must start with a letter.
- All other fragments must start and end with a letter or digit.
Domain has owner, a registration period, and may optionally have records.
A fee established by the committee is charged upon domain registration. After registration, the owner can manage this asset (add/delete records, transfer ownership to another owner) until the end of the domain registration period.
### Record
A record is a pair of values `<type, string>`.
Supported record types:
| Type | Description |
|-------|-------------------------------------------|
| A | Represents address record type |
| AAA | Represents IPv6 address record type |
| TXT | Represents text record type |
| CNAME | Represents canonical name record type |
| SOA | Represents start of authority record type |
### Owner
An owner is a wallet that has the right to manage this NFT (domain).
### Committee
The committee makes new tokens (domains), sets, and charges a fee for issuance.
## Globally Unique Domain Zone
For more information, see [here](../docs/globally-unique-domain-zone.md).