Looker Studio

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Looker Studio может подключаться к ClickHouse через интерфейс MySQL, используя официальный источник данных MySQL от Google.

Настройка ClickHouse Cloud

1. After creating your ClickHouse Cloud Service, on the Connect your app screen, select MySQL from the drop down.

2. Toggle the switch to enable the MySQL interface for this specific service. This will expose port 3306 for this service and prompt you with your MySQL connection screen that include your unique MySQL username.

Alternatively, in order to enable the MySQL interface for an existing service:

3. Ensure your service is in Running state then click on the service you want to enable the MySQL interface for. Select "Connect" from the left menu:

4. Select MySQL from the Connect With drop down.

5. Toggle the switch to enable the MySQL interface for this specific service. This will expose port 3306 for this service and prompt you with your MySQL connection screen that include your unique MySQL username.

Creating multiple MySQL users in ClickHouse Cloud

By default, there is a built-in mysql4<subdomain> user, which uses the same password as the default one. The <subdomain> part is the first segment of your ClickHouse Cloud hostname. This format is necessary to work with the tools that implement secure connection, but don't provide SNI information in their TLS handshake, which makes it impossible to do the internal routing without an extra hint in the username (MySQL console client is one of such tools).

Because of this, we highly recommend following the mysql4<subdomain>_<username> format when creating a new user intended to be used with the MySQL interface, where <subdomain> is a hint to identify your Cloud service, and <username> is an arbitrary suffix of your choice.

подсказка

For ClickHouse Cloud hostname like foobar.us-east1.aws.clickhouse.cloud, the <subdomain> part equals to foobar, and a custom MySQL username could look like mysql4foobar_team1.

You can create extra users to use with the MySQL interface if, for example, you need to apply extra settings.

1. Optional - create a settings profile to apply for your custom user. For example, my_custom_profile with an extra setting which will be applied by default when we connect with the user we create later:

   prefer_column_name_to_alias is used just as an example, you can use other settings there.

2. Create a user using the following format: mysql4<subdomain>_<username> (see above). The password must be in double SHA1 format. For example:

   or if you want to use a custom profile for this user:

   where my_custom_profile is the name of the profile you created earlier.

3. Grant the new user the necessary permissions to interact with the desired tables or databases. For example, if you want to grant access to system.query_log only:

4. Use the created user to connect to your ClickHouse Cloud service with the MySQL interface.

Troubleshooting multiple MySQL users in ClickHouse Cloud

If you created a new MySQL user, and you see the following error while connecting via MySQL CLI client:

In this case, ensure that the username follows the mysql4<subdomain>_<username> format, as described (above).

Настройка локального сервера ClickHouse

Please refer to the official documentation on how to set up a ClickHouse server with enabled MySQL interface.

Aside from adding an entry to the server's config.xml

it is also required to use Double SHA1 password encryption for the user that will be using MySQL interface.

Generating a random password encrypted with Double SHA1 from the shell:

The output should look like the following:

The first line is the generated password, and the second line is the hash we could use to configure ClickHouse.

Here is an example configuration for mysql_user that uses the generated hash:

/etc/clickhouse-server/users.d/mysql_user.xml

Replace password_double_sha1_hex entry with your own generated Double SHA1 hash.

Additionally, it is recommended to use use_mysql_types_in_show_columns to show the native MySQL types instead of ClickHouse ones in SHOW [FULL] COLUMNS query results, which allows BI tools to properly introspect the database schema when using MySQL connectors.

For example:

/etc/clickhouse-server/users.d/mysql_user.xml

or assign it to a different profile instead of the default one.

If you have the mysql binary available, you can test the connection from the commandline. Using the sample username (mysql_user) and password (LZOQYnqQN4L/T6L0) from above the command line would be:

Finally, configure the Clickhouse Server to listen on the desired IP address(es). For example, in config.xml, uncomment out the following to listen on all addresses:

Подключение Looker Studio к ClickHouse

Сначала войдите на https://lookerstudio.google.com, используя свою учетную запись Google, и создайте новый источник данных:

Найдите официальный коннектор MySQL, предоставленный Google (названный просто MySQL):

Укажите данные подключения. Обратите внимание, что порт интерфейса MySQL по умолчанию равен 9004, и он может отличаться в зависимости от конфигурации вашего сервера.

Теперь у вас есть два варианта, как получить данные из ClickHouse. Во-первых, вы можете использовать функцию Table Browser:

В качестве альтернативы вы можете указать пользовательский запрос для получения ваших данных:

Наконец, вы должны увидеть структуру таблицы, которую вы исследовали, и при необходимости настроить типы данных.

Теперь вы можете продолжить исследовать ваши данные или создать новый отчет!

Использование Looker Studio с ClickHouse Cloud

При использовании ClickHouse Cloud вам сначала необходимо включить интерфейс MySQL. Вы можете сделать это в диалоговом окне подключения, на вкладке "MySQL".

В интерфейсе Looker Studio выберите опцию "Включить SSL". SSL-сертификат ClickHouse Cloud подписан Let's Encrypt. Вы можете скачать этот корневой сертификат здесь.

Остальные шаги такие же, как указано выше в предыдущем разделе.