---
description: Install KumoMTA on Linux from prebuilt repositories for Rocky, Ubuntu, and Amazon Linux, with steps for the initial config file and starting the server.
---

# Installing on Linux

Pre-built releases are available for Rocky Linux 8/9, Ubuntu 20.04/22.04, and Amazon Linux 2/2023.

A repository is provided to ease installation on supported platforms.

The install instructions for supported platforms are shown below. If your platform is not listed, you can [build from source](source.md).

=== "Rocky 8/9"

    ```console
    $ sudo dnf -y install dnf-plugins-core
    $ sudo dnf config-manager --add-repo \
        https://openrepo.kumomta.com/files/kumomta-rocky.repo
    $ sudo yum install kumomta
    ```

=== "Ubuntu 22.04 LTS"

    ```console
    $ sudo apt install -y curl gnupg ca-certificates
    $ curl -fsSL https://openrepo.kumomta.com/kumomta-ubuntu-22/public.gpg | sudo gpg --yes --dearmor -o /usr/share/keyrings/kumomta.gpg
    $ sudo chmod 644 /usr/share/keyrings/kumomta.gpg
    $ curl -fsSL https://openrepo.kumomta.com/files/kumomta-ubuntu22.list | sudo tee /etc/apt/sources.list.d/kumomta.list > /dev/null
    $ sudo apt update
    $ sudo apt install -y kumomta
    ```

=== "Ubuntu 20.04 LTS"

    ```console
    $ sudo apt install -y curl gnupg ca-certificates
    $ curl -fsSL https://openrepo.kumomta.com/kumomta-ubuntu-20/public.gpg | sudo gpg --yes --dearmor -o /usr/share/keyrings/kumomta.gpg
    $ sudo chmod 644 /usr/share/keyrings/kumomta.gpg
    $ curl -fsSL https://openrepo.kumomta.com/files/kumomta-ubuntu20.list | sudo tee /etc/apt/sources.list.d/kumomta.list > /dev/null
    $ sudo apt update
    $ sudo apt install -y kumomta
    ```

=== "Amazon Linux 2"

    ```console
    $ sudo yum install -y yum-utils
    $ sudo yum-config-manager --add-repo=\
        https://openrepo.kumomta.com/files/kumomta-amazon.repo
    $ sudo yum install kumomta
    ```

=== "Amazon Linux 2023"

    ```console
    $ sudo dnf -y install dnf-plugins-core
    $ sudo dnf config-manager --add-repo \
        https://openrepo.kumomta.com/files/kumomta-amazon2023.repo
    $ sudo dnf install kumomta
    ```

## Installing from a Dev Repository

If you want to test the latest additions and improvements to KumoMTA, you can instead install from the dev repository on your platform of choice. The dev repository is rebuilt after each commit to the KumoMTA repository, which means the dev repository will always include the latest changes.

!!! warning
    While we do our best to test all commits, dev repositories should **never** be installed in production environments.

=== "Rocky 8/9"

    ```console
    $ sudo dnf -y install dnf-plugins-core
    $ sudo dnf config-manager --add-repo \
        https://openrepo.kumomta.com/files/kumomta-rocky.repo
    $ sudo yum install kumomta-dev
    ```

=== "Ubuntu 22.04 LTS"

    ```console
    $ sudo apt install -y curl gnupg ca-certificates
    $ curl -fsSL https://openrepo.kumomta.com/kumomta-ubuntu-22/public.gpg | sudo gpg --yes --dearmor -o /usr/share/keyrings/kumomta.gpg
    $ sudo chmod 644 /usr/share/keyrings/kumomta.gpg
    $ curl -fsSL https://openrepo.kumomta.com/files/kumomta-ubuntu22.list | sudo tee /etc/apt/sources.list.d/kumomta.list > /dev/null
    $ sudo apt update
    $ sudo apt install -y kumomta-dev
    ```

=== "Ubuntu 20.04 LTS"

    ```console
    $ sudo apt install -y curl gnupg ca-certificates
    $ curl -fsSL https://openrepo.kumomta.com/kumomta-ubuntu-20/public.gpg | sudo gpg --yes --dearmor -o /usr/share/keyrings/kumomta.gpg
    $ sudo chmod 644 /usr/share/keyrings/kumomta.gpg
    $ curl -fsSL https://openrepo.kumomta.com/files/kumomta-ubuntu20.list | sudo tee /etc/apt/sources.list.d/kumomta.list > /dev/null
    $ sudo apt update
    $ sudo apt install -y kumomta-dev
    ```

=== "Amazon Linux 2"

    ```console
    $ sudo yum install -y yum-utils
    $ sudo yum-config-manager --add-repo=\
        https://openrepo.kumomta.com/files/kumomta-amazon.repo
    $ sudo yum install kumomta-dev
    ```

=== "Amazon Linux 2023"

    ```console
    $ sudo dnf -y install dnf-plugins-core
    $ sudo dnf config-manager --add-repo \
        https://openrepo.kumomta.com/files/kumomta-amazon2023.repo
    $ sudo yum install kumomta-dev
    ```

## The Initial Config File

KumoMTA is now installed, but it requires a configuration policy so it knows how to behave. The installer creates a minimal configuration policy file at `/opt/kumomta/etc/policy/init.lua` that enables basic localhost relaying and logging.

See the [configuration](../configuration/concepts.md) chapter for more information on creating your own configuration policy.

## Starting KumoMTA

To start KumoMTA using systemd, execute the following command:

```console
$ sudo systemctl start kumomta
```

If you also intend to use the TSA shaping service, start that as well:

```console
$ sudo systemctl start kumo-tsa-daemon
```

For additional details on starting KumoMTA, including as a persistent service, see the [Starting KumoMTA](../operation/starting.md) chapter.
