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add a rollback step #8467

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merged 4 commits into from
May 9, 2022
Merged

add a rollback step #8467

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add a rollback step
en-jin19 May 6, 2022
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en-jin19 May 6, 2022
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en-jin19 May 6, 2022
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TomShawn May 9, 2022
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26 changes: 25 additions & 1 deletion two-data-centers-in-one-city-deployment.md
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Expand Up @@ -162,14 +162,38 @@ cat rule.json
]
```

To use the configurations in `rule.json`, override the existing configurations by running the following command:
To use the configurations in `rule.json`, run the following command to back up the existing configuration to the `default.json` file and overwrite the existing configuration with `rule.json`:

{{< copyable "shell-regular" >}}

```bash
pd-ctl config placement-rules rule-bundle load --out="default.json"
pd-ctl config placement-rules rule-bundle save --in="rule.json"
```

If you need to roll back to the previous configuration, you can restore the backup file `default.json` or write the following JSON file manually and overwrite the current configuration with this JSON file:

```
cat default.json
[
{
"group_id": "pd",
"group_index": 0,
"group_override": false,
"rules": [
{
"group_id": "pd",
"id": "default",
"start_key": "",
"end_key": "",
"role": "voter",
"count": 3
}
]
}
]
```

### Enable the DR Auto-Sync mode

The replication mode is controlled by PD. You can configure the replication mode in the PD configuration file using one of the following methods:
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