ClickHouse/docs/en/getting_started/index.md

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# Getting started
## System requirements
This is not a cross-platform system. It requires Linux Ubuntu Precise (12.04) or newer, with x86_64 architecture and support for the SSE 4.2 instruction set.
To check for SSE 4.2:
```bash
grep -q sse4_2 /proc/cpuinfo && echo "SSE 4.2 supported" || echo "SSE 4.2 not supported"
```
We recommend using Ubuntu Trusty, Ubuntu Xenial, or Ubuntu Precise.
The terminal must use UTF-8 encoding (the default in Ubuntu).
## Installation
For testing and development, the system can be installed on a single server or on a desktop computer.
### Installing from packages Debian/Ubuntu
In `/etc/apt/sources.list` (or in a separate `/etc/apt/sources.list.d/clickhouse.list` file), add the repository:
```text
deb http://repo.yandex.ru/clickhouse/deb/stable/ main/
```
If you want to use the most recent test version, replace 'stable' with 'testing'.
Then run:
```bash
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv E0C56BD4 # optional
sudo apt-get update
sudo apt-get install clickhouse-client clickhouse-server
```
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You can also download and install packages manually from here:
<https://repo.yandex.ru/clickhouse/deb/stable/main/>
ClickHouse contains access restriction settings. They are located in the 'users.xml' file (next to 'config.xml').
By default, access is allowed from anywhere for the 'default' user, without a password. See 'user/default/networks'.
For more information, see the section "Configuration files".
### Installing from sources
To compile, follow the instructions: build.md
You can compile packages and install them.
You can also use programs without installing packages.
```text
Client: dbms/src/Client/
Server: dbms/src/Server/
```
For the server, create a catalog with data, such as:
```text
/opt/clickhouse/data/default/
/opt/clickhouse/metadata/default/
```
(Configurable in the server config.)
Run 'chown' for the desired user.
Note the path to logs in the server config (src/dbms/src/Server/config.xml).
### Other installation methods
Docker image: <https://hub.docker.com/r/yandex/clickhouse-server/>
RPM packages for CentOS or RHEL: <https://github.com/Altinity/clickhouse-rpm-install>
Gentoo overlay: <https://github.com/kmeaw/clickhouse-overlay>
## Launch
To start the server (as a daemon), run:
```bash
sudo service clickhouse-server start
```
See the logs in the `/var/log/clickhouse-server/ directory.`
If the server doesn't start, check the configurations in the file `/etc/clickhouse-server/config.xml.`
You can also launch the server from the console:
```bash
clickhouse-server --config-file=/etc/clickhouse-server/config.xml
```
In this case, the log will be printed to the console, which is convenient during development.
If the configuration file is in the current directory, you don't need to specify the '--config-file' parameter. By default, it uses './config.xml'.
You can use the command-line client to connect to the server:
```bash
clickhouse-client
```
The default parameters indicate connecting with localhost:9000 on behalf of the user 'default' without a password.
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The client can be used for connecting to a remote server.
Example:
```bash
clickhouse-client --host=example.com
```
For more information, see the section "Command-line client".
Checking the system:
```bash
milovidov@hostname:~/work/metrica/src/dbms/src/Client$ ./clickhouse-client
ClickHouse client version 0.0.18749.
Connecting to localhost:9000.
Connected to ClickHouse server version 0.0.18749.
:) SELECT 1
SELECT 1
┌─1─┐
│ 1 │
└───┘
1 rows in set. Elapsed: 0.003 sec.
:)
```
**Congratulations, the system works!**
To continue experimenting, you can try to download from the test data sets.