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Added some explanation to vmctl docs (#1217)

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Added explanation that vmctl do not make snapshot from Prometheus when run migration data
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Denys Holius 2021-04-15 20:40:48 +03:00 committed by GitHub
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docs/vmctl.md
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@ -274,12 +274,12 @@ You may find useful a 3rd party solution for this - https://github.com/jonppe/in
## Migrating data from Prometheus
`vmctl` supports the `prometheus` mode for migrating data from Prometheus to VictoriaMetrics time-series database.
Migration is based on reading Prometheus snapshot, which is basically a hard-link to Prometheus data files.
Migration is based on reading Prometheus snapshot, which is basically a hard-link to Prometheus data files.
See `./vmctl prometheus --help` for details and full list of flags.
See `./vmctl prometheus --help` for details and full list of flags. Also see Prometheus related articles [here](#articles).
To use migration tool please specify the path to Prometheus snapshot `--prom-snapshot` and VictoriaMetrics address `--vm-addr`.
More about Prometheus snapshots may be found [here](https://www.robustperception.io/taking-snapshots-of-prometheus-data).
To use migration tool please specify the file path to Prometheus snapshot `--prom-snapshot` (see how to make a snapshot [here](https://www.robustperception.io/taking-snapshots-of-prometheus-data)) and VictoriaMetrics address `--vm-addr`.
Please note, that `vmctl` *do not make a snapshot from Prometheus*, it uses an already prepared snapshot. More about Prometheus snapshots may be found [here](https://www.robustperception.io/taking-snapshots-of-prometheus-data) and [here](https://medium.com/@romanhavronenko/victoriametrics-how-to-migrate-data-from-prometheus-d44a6728f043).
Flag `--vm-addr` for single-node VM is usually equal to `--httpListenAddr`, and for cluster version
is equal to `--httpListenAddr` flag of VMInsert component. Please note, that vmctl performs initial readiness check for the given address
by checking `/health` endpoint. For cluster version it is additionally required to specify the `--vm-account-id` flag.