Looker Studio

Partner Integration

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

Настройка ClickHouse Cloud

Select Connect your app

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

Enable the MySQL interface

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

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

Select Connect

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:

Choose MySQL

Select MySQL from the Connect With drop down.

Enable the MySQL interface

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 a readonly MySQL user in ClickHouse Cloud

ClickHouse Cloud automatically creates a mysql4<subdomain> user that shares the same password as the default user. The <subdomain> portion corresponds to the first part of your ClickHouse Cloud hostname.

This username format is required for compatibility with tools that establish secure connections but don't include SNI (Server Name Indication) data in their TLS handshake. Without SNI information, the system cannot perform proper internal routing, so the subdomain hint embedded in the username provides the necessary routing information. The MySQL console client is an example of a tool that requires this.

Совет

A recommended best practice is to create a new readonly MySQL user.

Примечание

For a 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.

Create a readonly settings profile

Create a settings profile to apply to your readonly user, setting the readonly setting to 1:

CREATE SETTINGS PROFILE readonly_profile SETTINGS readonly = 1

Create a new readonly MySQL user

Create a user with a name following this format:

mysql4<subdomain>_<username>

Apply the readonly_profile to the new user and make sure that the password is in double SHA1 format. For example:

CREATE USER mysql4foobar_readonly
IDENTIFIED WITH double_sha1_password BY 'YourPassword42$'
SETTINGS PROFILE 'readonly_profile';

Grant the new user permissions to access the desired tables

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:

GRANT SELECT ON system.query_log TO mysql4foobar_readonly;

Примечание

For the readonly user, make sure to only grant SELECT permissions to the tables you want to access.

The newly created user can be used 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:

ERROR 2013 (HY000): Lost connection to MySQL server at 'reading authorization packet', system error: 54

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

<clickhouse>
    <mysql_port>9004</mysql_port>
</clickhouse>

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:

PASSWORD=$(base64 < /dev/urandom | head -c16); echo "$PASSWORD"; echo -n "$PASSWORD" | sha1sum | tr -d '-' | xxd -r -p | sha1sum | tr -d '-'

The output should look like the following:

LZOQYnqQN4L/T6L0
fbc958cc745a82188a51f30de69eebfc67c40ee4

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

<users>
    <mysql_user>
        <password_double_sha1_hex>fbc958cc745a82188a51f30de69eebfc67c40ee4</password_double_sha1_hex>
        <networks>
            <ip>::/0</ip>
        </networks>
        <profile>default</profile>
        <quota>default</quota>
    </mysql_user>
</users>

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

<profiles>
    <default>
        <use_mysql_types_in_show_columns>1</use_mysql_types_in_show_columns>
    </default>
</profiles>

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:

mysql --protocol tcp -h localhost -u mysql_user -P 9004 --password=LZOQYnqQN4L/T6L0

mysql> show databases;
+--------------------+
| name               |
+--------------------+
| INFORMATION_SCHEMA |
| default            |
| information_schema |
| system             |
+--------------------+
4 rows in set (0.00 sec)
Read 4 rows, 603.00 B in 0.00156 sec., 2564 rows/sec., 377.48 KiB/sec.

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:

<listen_host>::</listen_host> 

Подключение Looker Studio к ClickHouse

Сначала войдите на сайт https://lookerstudio.google.com под своей учетной записью Google и создайте новый источник данных (Data Source):

Найдите официальный коннектор MySQL от Google (называется просто MySQL):

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

Теперь у вас есть два варианта получения данных из ClickHouse. Можно использовать инструмент Table Browser:

Либо вы можете указать произвольный SQL-запрос для получения данных:

В результате вы увидите автоматически определенную структуру таблицы и при необходимости сможете скорректировать типы данных.

Теперь вы можете приступать к анализу своих данных или созданию нового отчета!

Использование Looker Studio с ClickHouse Cloud

При использовании ClickHouse Cloud сначала необходимо включить интерфейс MySQL. Это можно сделать в диалоговом окне подключения, на вкладке «MySQL».

В интерфейсе Looker Studio выберите опцию «Enable SSL». SSL-сертификат ClickHouse Cloud подписан центром Let's Encrypt. Вы можете скачать корневой сертификат здесь.

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