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reserved services overview (#122, #41)

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Michael Quigley 2022-11-30 14:47:41 -05:00
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# v0.3 Reserved Services
The `v0.3` series introduces a concept of "reserving" services. The intention is that the `zrok` control plane will support limits on the number of reserved services (and eventually `frontend`instances) that an account is allowed to utilize. Service reservations could also be time-limited, or possibly even bandwidth-limited (the reservation expires after a bandwidth threshold is crossed).
## Reserved Services Example
`v0.3` introduces the `zrok reserve` command:
```
$ zrok reserve private http://localhost:9090
[ 0.047] INFO main.(*reserveCommand).run: your reserved service token is 'x88xujrpk4k3'
[ 0.048] INFO main.(*reserveCommand).run: your reserved service frontend is 'http://x88xujrpk4k3.zrok.quigley.com:8080/'
```
The `reserve` command creates a service reservation that allows a service to become non-ephemeral. The service token `x88xujrpk4k3` is guaranteed to exist between `backend` executions.
Running a `backend` against a service reservation is done like this:
```
$ zrok share reserved x88xujrpk4k3
[ 0.005] INFO main.(*shareReservedCommand).run: sharing target endpoint: 'http://localhost:9090'
[ 0.040] INFO main.(*shareReservedCommand).run: use this command to access your zrok service: 'zrok access private x88xujrpk4k3'
^C
$ zrok share reserved x88xujrpk4k3
[ 0.007] INFO main.(*shareReservedCommand).run: sharing target endpoint: 'http://localhost:9090'
[ 0.047] INFO main.(*shareReservedCommand).run: use this command to access your zrok service: 'zrok access private x88xujrpk4k3'
```
The `share reserved` comand starts a backend process for the service. User-facing and public-facing `frontend` instances are allowed to come and go, just as if the service were ephemeral.
Releasing a reserved service is done with the `zrok release` command:
```
$ zrok release x88xujrpk4k3
[ 0.056] INFO main.(*releaseCommand).run: reserved service 'x88xujrpk4k3' released
```