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Merge pull request #62521 from ClickHouse/doc-composable-protocols

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Doc: add Composable Protocols
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Nikita Mikhaylov 2024-04-11 12:17:12 +00:00 committed by GitHub
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155
docs/en/operations/settings/composable-protocols.md Normal file
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---
slug: /en/operations/settings/composable-protocols
sidebar_position: 64
sidebar_label: Composable Protocols
---
# Composable Protocols
Composable protocols allows more flexible configuration of TCP access to the ClickHouse server. This configuration can co-exist with or replace conventional configuration.
## Composable protocols section is denoted as `protocols` in configuration xml
**Example:**
``` xml
<protocols>
</protocols>
```
## Basic modules define protocol layers
**Example:**
``` xml
<protocols>
<!-- plain_http module -->
<plain_http>
<type>http</type>
</plain_http>
</protocols>
```
where:
- `plain_http` - name which can be referred by another layer
- `type` - denotes protocol handler which will be instantiated to process data, set of protocol handlers is predefined:
* `tcp` - native clickhouse protocol handler
* `http` - http clickhouse protocol handler
* `tls` - TLS encryption layer
* `proxy1` - PROXYv1 layer
* `mysql` - MySQL compatibility protocol handler
* `postgres` - PostgreSQL compatibility protocol handler
* `prometheus` - Prometheus protocol handler
* `interserver` - clickhouse interserver handler
:::note
`gRPC` protocol handler is not implemented for `Composable protocols`
:::
## Endpoint (i.e. listening port) is denoted by `<port>` and (optional) `<host>` tags
**Example:**
``` xml
<protocols>
<plain_http>
<type>http</type>
<!-- endpoint -->
<host>127.0.0.1</host>
<port>8123</port>
</plain_http>
</protocols>
```
If `<host>` is omitted, then `<listen_host>` from root config is used.
## Layers sequence is defined by `<impl>` tag, referencing another module
**Example:** definition for HTTPS protocol
``` xml
<protocols>
<!-- http module -->
<plain_http>
<type>http</type>
</plain_http>
<!-- https module configured as a tls layer on top of plain_http module -->
<https>
<type>tls</type>
<impl>plain_http</impl>
<host>127.0.0.1</host>
<port>8443</port>
</https>
</protocols>
```
## Endpoint can be attached to any layer
**Example:** definition for HTTP (port 8123) and HTTPS (port 8443) endpoints
``` xml
<protocols>
<plain_http>
<type>http</type>
<host>127.0.0.1</host>
<port>8123</port>
</plain_http>
<https>
<type>tls</type>
<impl>plain_http</impl>
<host>127.0.0.1</host>
<port>8443</port>
</https>
</protocols>
```
## Additional endpoints can be defined by referencing any module and omitting `<type>` tag
**Example:** `another_http` endpoint is defined for `plain_http` module
``` xml
<protocols>
<plain_http>
<type>http</type>
<host>127.0.0.1</host>
<port>8123</port>
</plain_http>
<https>
<type>tls</type>
<impl>plain_http</impl>
<host>127.0.0.1</host>
<port>8443</port>
</https>
<another_http>
<impl>plain_http</impl>
<host>127.0.0.1</host>
<port>8223</port>
</another_http>
</protocols>
```
## Some modules can contain specific for its layer parameters
**Example:** for TLS layer private key (`privateKeyFile`) and certificate files (`certificateFile`) can be specified
``` xml
<protocols>
<plain_http>
<type>http</type>
<host>127.0.0.1</host>
<port>8123</port>
</plain_http>
<https>
<type>tls</type>
<impl>plain_http</impl>
<host>127.0.0.1</host>
<port>8443</port>
<privateKeyFile>another_server.key</privateKeyFile>
<certificateFile>another_server.crt</certificateFile>
</https>
</protocols>
```

3
utils/check-style/aspell-ignore/en/aspell-dict.txt
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@ -183,6 +183,8 @@ CompiledExpressionCacheCount
ComplexKeyCache
ComplexKeyDirect
ComplexKeyHashed
Composable
composable
Config
ConnectionDetails
Const
@ -697,6 +699,7 @@ PCRE
PRCP
PREWHERE
PROCESSLIST
PROXYv
PSUN
PagerDuty
ParallelFormattingOutputFormatThreads