confirmation. This may install a large number of packages, depending on the
  current configuration of your host machine.
- By default, the script installs the latest stable release of Docker,
  containerd, and runc. When using this script to provision a machine, this may
  result in unexpected major version upgrades of Docker. Always test upgrades in
  a test environment before deploying to your production systems.
- The script isn't designed to upgrade an existing Docker installation. When
  using the script to update an existing installation, dependencies may not be
  updated to the expected version, resulting in outdated versions.

> [!TIP]
>
> Preview script steps before running. You can run the script with the `--dry-run` option to learn what steps the
> script will run when invoked:
>
> ```console
> $ curl -fsSL https://get.docker.com -o get-docker.sh
> $ sudo sh ./get-docker.sh --dry-run
> ```

This example downloads the script from
[https://get.docker.com/](https://get.docker.com/) and runs it to install the
latest stable release of Docker on Linux:

```console
$ curl -fsSL https://get.docker.com -o get-docker.sh
$ sudo sh get-docker.sh
Executing docker install script, commit: 7cae5f8b0decc17d6571f9f52eb840fbc13b2737
<...>
```

You have now successfully installed and started Docker Engine. The `docker`
service starts automatically on Debian based distributions. On `RPM` based
distributions, such as CentOS, Fedora, RHEL or SLES, you need to start it
manually using the appropriate `systemctl` or `service` command. As the message
indicates, non-root users can't run Docker commands by default.

> **Use Docker as a non-privileged user, or install in rootless mode?**
>
> The installation script requires `root` or `sudo` privileges to install and
> use Docker. If you want to grant non-root users access to Docker, refer to the
> [post-installation steps for Linux](/engine/install/linux-postinstall/#manage-docker-as-a-non-root-user).
> You can also install Docker without `root` privileges, or configured to run in
> rootless mode. For instructions on running Docker in rootless mode, refer to
> [run the Docker daemon as a non-root user (rootless mode)](/engine/security/rootless/).

#### Install pre-releases

Docker also provides a convenience script at
[https://test.docker.com/](https://test.docker.com/) to install pre-releases of
Docker on Linux. This script is equal to the script at `get.docker.com`, but
configures your package manager to use the test channel of the Docker package
repository. The test channel includes both stable and pre-releases (beta
versions, release-candidates) of Docker. Use this script to get early access to
new releases, and to evaluate them in a testing environment before they're
released as stable.

To install the latest version of Docker on Linux from the test channel, run:

```console
$ curl -fsSL https://test.docker.com -o test-docker.sh
$ sudo sh test-docker.sh
```

#### Upgrade Docker after using the convenience script

If you installed Docker using the convenience script, you should upgrade Docker
using your package manager directly. There's no advantage to re-running the
convenience script. Re-running it can cause issues if it attempts to re-install
repositories which already exist on the host machine.