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system-variables: add skip-name-resolve (#6491) #6586

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Sep 30, 2021
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system-variables: add skip-name-resolve (#6491) #6586

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system-variables: add skip-name-resolve
morgo Sep 15, 2021
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dveeden Sep 29, 2021
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system-variables: add skip-name-resolve
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@morgo @ti-chi-bot
morgo authored and ti-chi-bot committed Sep 30, 2021
commit 3b855e33b512c40ca9498ed2ad93aa2abcd33a1f
17 changes: 17 additions & 0 deletions system-variables.md
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Expand Up @@ -211,6 +211,23 @@ mysql> SELECT * FROM t1;
- Range: `[0, 65535]`
- The port that the `tidb-server` is listening on when speaking the MySQL protocol.

### skip_name_resolve <span class="version-mark">New in v5.2.0</span>

- Scope: GLOBAL
- Default value: `OFF`
- This controls if the `tidb-server` should resolve hostnames as part of the connection handshake.
- Enabling this option is useful as a performance optimization when DNS is unreliable.

> **Note:**
>
> When `skip_name_resolve=ON`, users with a hostname in their identity will no longer be able to log in. i.e.
>
> ```sql
> CREATE USER 'appuser'@'apphost' IDENTIFIED BY 'app-password';
> ```
>
> In this example, it is recommended to replace _apphost_ with an IP address or wildcard (`%`).

### socket

- Scope: NONE
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