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142 lines
6.9 KiB
Markdown
142 lines
6.9 KiB
Markdown
# ClickHouse Server Docker Image
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## What is ClickHouse?
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ClickHouse is an open-source column-oriented database management system that allows generating analytical data reports in real time.
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ClickHouse manages extremely large volumes of data in a stable and sustainable manner. It currently powers [Yandex.Metrica](https://metrica.yandex.com/), world’s [second largest](http://w3techs.com/technologies/overview/traffic_analysis/all) web analytics platform, with over 13 trillion database records and over 20 billion events a day, generating customized reports on-the-fly, directly from non-aggregated data. This system was successfully implemented at [CERN’s LHCb experiment](https://www.yandex.com/company/press_center/press_releases/2012/2012-04-10/) to store and process metadata on 10bn events with over 1000 attributes per event registered in 2011.
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For more information and documentation see https://clickhouse.yandex/.
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## How to use this image
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### start server instance
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```bash
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$ docker run -d --name some-clickhouse-server --ulimit nofile=262144:262144 yandex/clickhouse-server
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```
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By default ClickHouse will be accessible only via docker network. See the [networking section below](#networking).
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### connect to it from a native client
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```bash
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$ docker run -it --rm --link some-clickhouse-server:clickhouse-server yandex/clickhouse-client --host clickhouse-server
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```
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More information about [ClickHouse client](https://clickhouse.yandex/docs/en/interfaces/cli/).
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### connect to it using curl
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```bash
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echo "SELECT 'Hello, ClickHouse!'" | docker run -i --rm --link some-clickhouse-server:clickhouse-server curlimages/curl 'http://clickhouse-server:8123/?query=' -s --data-binary @-
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```
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More information about [ClickHouse HTTP Interface](https://clickhouse.tech/docs/en/interfaces/http/).
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### stopping / removing the containter
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```bash
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$ docker stop some-clickhouse-server
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$ docker rm some-clickhouse-server
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```
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### networking
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You can expose you ClickHouse running in docker by [mapping particular port](https://docs.docker.com/config/containers/container-networking/) from inside container to a host ports:
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```bash
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$ docker run -d -p 18123:8123 -p19000:9000 --name some-clickhouse-server --ulimit nofile=262144:262144 yandex/clickhouse-server
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$ echo 'SELECT version()' | curl 'http://localhost:18123/' --data-binary @-
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20.12.3.3
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```
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or by allowing container to use [host ports directly](https://docs.docker.com/network/host/) using `--network=host` (also allows archiving better network performance):
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```bash
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$ docker run -d --network=host --name some-clickhouse-server --ulimit nofile=262144:262144 yandex/clickhouse-server
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$ echo 'SELECT version()' | curl 'http://localhost:8123/' --data-binary @-
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20.12.3.3
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```
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### Volumes
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Typically you may want to mount the following folders inside your container to archieve persistency:
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* `/var/lib/clickhouse/` - main folder where ClickHouse stores the data
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* `/val/log/clickhouse-server/` - logs
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```bash
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$ docker run -d \
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-v $(realpath ./ch_data):/var/lib/clickhouse/ \
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-v $(realpath ./ch_logs):/var/log/clickhouse-server/ \
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--name some-clickhouse-server --ulimit nofile=262144:262144 yandex/clickhouse-server
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```
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You may also want to mount:
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* `/etc/clickhouse-server/config.d/*.xml` - files with server configuration adjustmenets
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* `/etc/clickhouse-server/usert.d/*.xml` - files with use settings adjustmenets
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* `/docker-entrypoint-initdb.d/` - folder with database initialization scripts (see below).
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### Linux capabilities
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ClickHouse has some advanced functionality which requite enabling several [linux capabilities](https://man7.org/linux/man-pages/man7/capabilities.7.html).
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It is optional and can be enabled using the following [docker command line agruments](https://docs.docker.com/engine/reference/run/#runtime-privilege-and-linux-capabilities):
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```bash
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$ docker run -d \
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--cap-add=SYS_NICE --cap-add=NET_ADMIN --cap-add=IPC_LOCK \
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--name some-clickhouse-server --ulimit nofile=262144:262144 yandex/clickhouse-server
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```
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## Configuration
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Container exposes 8123 port for [HTTP interface](https://clickhouse.yandex/docs/en/interfaces/http_interface/) and 9000 port for [native client](https://clickhouse.yandex/docs/en/interfaces/tcp/).
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ClickHouse configuration represented with a file "config.xml" ([documentation](https://clickhouse.yandex/docs/en/operations/configuration_files/))
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### Start server instance with custom configuration
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```bash
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$ docker run -d --name some-clickhouse-server --ulimit nofile=262144:262144 -v /path/to/your/config.xml:/etc/clickhouse-server/config.xml yandex/clickhouse-server
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```
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### Start server as custom user
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```
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# $(pwd)/data/clickhouse should exist and be owned by current user
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$ docker run --rm --user ${UID}:${GID} --name some-clickhouse-server --ulimit nofile=262144:262144 -v "$(pwd)/logs/clickhouse:/var/log/clickhouse-server" -v "$(pwd)/data/clickhouse:/var/lib/clickhouse" yandex/clickhouse-server
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```
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When you use the image with mounting local directories inside you probably would like to not mess your directory tree with files owner and permissions. Then you could use `--user` argument. In this case, you should mount every necessary directory (`/var/lib/clickhouse` and `/var/log/clickhouse-server`) inside the container. Otherwise, image will complain and not start.
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### Start server from root (useful in case of userns enabled)
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```
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$ docker run --rm -e CLICKHOUSE_UID=0 -e CLICKHOUSE_GID=0 --name clickhouse-server-userns -v "$(pwd)/logs/clickhouse:/var/log/clickhouse-server" -v "$(pwd)/data/clickhouse:/var/lib/clickhouse" yandex/clickhouse-server
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```
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### How to create default database and user on starting
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Sometimes you may want to create user (user named `default` is used by default) and database on image starting. You can do it using environment variables `CLICKHOUSE_DB`, `CLICKHOUSE_USER`, `CLICKHOUSE_DEFAULT_ACCESS_MANAGEMENT` and `CLICKHOUSE_PASSWORD`:
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```
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$ docker run --rm -e CLICKHOUSE_DB=my_database -e CLICKHOUSE_USER=username -e CLICKHOUSE_DEFAULT_ACCESS_MANAGEMENT=1 -e CLICKHOUSE_PASSWORD=password -p 9000:9000/tcp yandex/clickhouse-server
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```
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## How to extend this image
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If you would like to do additional initialization in an image derived from this one, add one or more `*.sql`, `*.sql.gz`, or `*.sh` scripts under `/docker-entrypoint-initdb.d`. After the entrypoint calls `initdb` it will run any `*.sql` files, run any executable `*.sh` scripts, and source any non-executable `*.sh` scripts found in that directory to do further initialization before starting the service.
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Also you can provide environment variables `CLICKHOUSE_USER` & `CLICKHOUSE_PASSWORD` that will be used for clickhouse-client during initialization.
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For example, to add an additional user and database, add the following to `/docker-entrypoint-initdb.d/init-db.sh`:
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```bash
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#!/bin/bash
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set -e
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clickhouse client -n <<-EOSQL
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CREATE DATABASE docker;
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CREATE TABLE docker.docker (x Int32) ENGINE = Log;
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EOSQL
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```
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## License
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View [license information](https://github.com/ClickHouse/ClickHouse/blob/master/LICENSE) for the software contained in this image.
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