- A fresh installation of [Ubuntu 16.04/18.04 x64](https://www.ubuntu.com/download), [Debian 9+ x64](https://www.debian.org/distrib/) or [CentOS 7 x64](https://www.centos.org/download/) *(experimental)* with the FQDN set <sup>[1]</sup>
If you're using Debian 9+ or Ubuntu 18.04, make sure your package manager is configured to install a sufficiently recent version of nginx<sup>[3]</sup>, otherwise, the installation may fail due to `unmet dependencies` relating nginx.
Once the installation is complete, you can open a browser to setup your SSH key and virtualhost settings. Open your browser of choice and navigate to the host's IP address - or the domain you assigned to that IP previously - and configure Dokku via the web admin.
Alternatively, instructions to skip the web installer with an unattended installation are available in the [advanced install guide](/docs/getting-started/advanced-installation/#configuring).
> **Warning:** If you don't complete setup via the web installer (even if you set up SSH keys and virtual hosts otherwise) your Dokku installation will remain vulnerable to anyone finding the setup page and inserting their key. You can check if it is still running via `ps auxf | grep dokku-installer`, and it may be stopped via your server's init system - usually either `service dokku-installer stop` or `stop dokku-installer`.
> **Warning:** Web installer is not available on CentOS and Arch Linux. You will need to configure [SSH keys](/docs/deployment/user-management.md#adding-ssh-keys) and [virtual hosts](/docs/configuration/domains.md#customizing-hostnames) using dokku command line interface - see unattended installation linked above.
Once you save your settings, the web admin will self-terminate and you should be able to run or [deploy to the Dokku installation](/docs/deployment/application-deployment.md).
For various reasons, certain hosting providers may have other steps that should be preferred to the above. If hosted on any of the following popular hosts, please follow the linked to instructions:
- <sup>[2]: If your system has less than 1GB of memory, you can use [this workaround](/docs/getting-started/advanced-installation.md#vms-with-less-than-1gb-of-memory).</sup>
- <sup>[3]: nginx >= 1.8.0 can be installed via the [nginx repositories](https://www.nginx.com/resources/admin-guide/installing-nginx-open-source/), or by adding [this PPA](https://launchpad.net/~nginx/+archive/ubuntu/stable) if you're using Ubuntu. nginx >= 1.11.5 is necessary for HTTP/2 support</sup>
