Plesk Documentation and Help Portal

System Requirements for Plesk Obsidian

We recommend that you read information about the product installation, upgrade, or migration before you start deploying Plesk. This information, including detailed instructions, can be found in the Deployment Guide.

Contents

  1. Supported Operating Systems
  2. Hardware requirements
  3. Supported browsers
  4. Supported virtualization
  5. Earlier Plesk Versions Supported for Upgrade
  6. Source Hosting Platforms Supported for Migration
  7. Email Clients Supporting Mail Autodiscover
  8. Supported Components
    1. Supplied Components
    2. Supported Third-Party Components

Supported Operating Systems

Note: When choosing the operating system for your Plesk server, we recommend that you check out the operating system termination date set by the vendor.

Linux

Plesk Obsidian for Linux can run on the following operating systems:

Ubuntu 24.04 (Recommended), Ubuntu 22.04, Ubuntu 20.04, Ubuntu 18.04
  • Plesk only supports Ubuntu servers running the systemd init system. Compatibility with sysvinit has not been tested and is not guaranteed.
  • A number of limitations exist for Ubuntu 24.04, Ubuntu 22.04, and Ubuntu 20.04.
  • Plesk announces Extended Lifecycle Support (ELS) for Ubuntu 18.04 until July 1, 2025:
    • Supporting EOL OSes incurs additional development and maintenance costs, and so taking advantage of this offer will cost extra.
    • Plesk recommends that you begin planning to either dist-upgrade any Ubuntu 18.04 servers with Plesk you may operate, or to migrate hosted websites from them to servers with Plesk running one of the recommended OSes.
    • Plesk continues to accept technical support requests from Plesk Obsidian on supported product versions on Ubuntu 18.04 without any restrictions.
    • Plesk reserves the right to warn Ubuntu 18.04 administrators about risks of an outdated OS using any channels including in-product notifications.
Ubuntu 22.04 LTS for ARM
  • Plesk only supports Ubuntu servers running the systemd init system. Compatibility with sysvinit has not been tested and is not guaranteed.
  • Plesk supports Ubuntu 22.04 with a number of limitations.
  • Dr.Web is not available.
  • Certain extensions are not available and will not be installed with the recommended preset.
  • Nginx is built without the Pagespeed module.
AlmaLinux 9.x (Recommended), AlmaLinux 8.x
  • Plesk supports AlmaLinux 9 with a number of limitations.
  • You can now in-place convert your Plesk server on CentOS 8 to AlmaLinux 8. To do so, run the script prepared by the AlmaLinux team on your CentOS 8 server.
Debian 12 (Recommended), Debian 11, Debian 10
  • Plesk only supports Debian servers running the systemd init system. Compatibility with sysvinit has not been tested and is not guaranteed.
  • Plesk supports Debian 11 with a number of limitations. You can use the dist-upgrade procedure to upgrade your OS from Debian 10 to Debian 11.
  • Before installing Plesk Obsidian on Debian, disable AppArmor first.
  • Plesk announces Extended Lifecycle Support (ELS) for Debian 10 until July 1, 2025. Supporting EOL OSes incurs additional development and maintenance costs, and so taking advantage of this offer will cost extra.
CloudLinux 8.x (Recommended), CloudLinux 7.x
  • CloudLinux is supported at the latest available minor (.x) versions, but no earlier than CloudLinux 7.1.
  • Installing or operating Plesk on a CloudLinux server with link traversal protection enabled results in a variety of issues. To avoid them, disable the 'fs.protected_symlinks_create' kernel option first.
  • Plesk announces Extended Lifecycle Support (ELS) for CloudLinux 7 until January 1, 2026. Supporting EOL OSes incurs additional development and maintenance costs, and so taking advantage of this offer will cost extra.
Red Hat Enterprise Linux 9.x (Recommended), Red Hat Enterprise Linux 8.x
Rocky Linux 8.x
  • You can now in-place convert your Plesk server on CentOS 8 to Rocky Linux 8. To do so, follow the procedure described in the Rocky Linux documentation.
CentOS 7.x
  • CentOS is supported at the latest available minor (.x) version.
  • Plesk announces Extended Lifecycle Support (ELS) for CentOS 7 until January 1, 2026. Supporting EOL OSes incurs additional development and maintenance costs, and so taking advantage of this offer will cost extra.

Windows

Plesk Obsidian for Microsoft Windows can run on the following operating systems (including Server Core installations):

Windows Server 2025, Windows Server 2022 (Recommended), Windows Server 2019, Windows Server 2016 (Standard, Datacenter, and Essentials editions)
  • Configure a static IP address on the server before installing Plesk for Windows.
  • Plesk for Windows can only be installed on NTFS partitions.
  • If you plan to use Microsoft SQL Server support in Plesk for Windows, the SQL Server must be installed and configured to use standard or mixed security mode. If Microsoft SQL Server is not installed, you can select it to be installed with Plesk for Windows and configured with administrator name "sa" and a random password.
  • Both new Plesk installations and those updated from Plesk Onyx cannot work on a server acting as a primary or backup domain controller.
  • Due to a limitation in Microsoft DNS on Windows Server 2025, it is not possible to create HTTPS and CAA DNS records in Plesk. Microsoft DNS on this version of Windows cannot load unknown record types from the zone file, which prevents support for these record types.

Hardware requirements

RAM and Swap

RAM (minimum)

  • Plesk for Linux: 1 GB + 1 GB swap
  • Plesk for Windows: 2 GB

RAM (recommended)

For shared hosting, we recommend having 1GB of RAM for every 40-50 websites, as long as no more than 10% of all hosted websites have any persistent number of visitors per week/month.

For dedicated hosting, we recommend having this much RAM per website, as long as no website has more than 1-3 simultaneous visitors, or more than 500 unique visitors per day.

  • Typical website: 128 MB
  • WordPress: 64 MB
  • Joomla: 64 MB
  • Drupal: 128 MB
  • Symfony: 128 MB

For websites that generate more traffic, we recommend having between 500 MB and 1 GB of RAM per website.

Swap (recommended)

  • 1 GB of RAM on the server or less: 1 GB
  • More than 1 GB of RAM on the server: 1/2 * the amount of RAM on the server

Disk Space

Disk space (minimum)

  • Plesk for Linux: 20 GB
  • Plesk for Windows: 32 GB

Disk space (recommended)

  • Shared hosting (100-500 websites per server): Between 2 and 2.5 GB per website
  • Dedicated hosting (1-10 websites per server): Between 4 and 12 GB per website

Supported browsers

The latest versions of the following browsers are supported:

Desktop

  • Google Chrome
  • Mozilla Firefox
  • Apple Safari
  • Opera
  • Microsoft Edge®

Smartphones and Tablets

  • Chrome Mobile
  • Apple Safari on iOS

Supported virtualization

The following virtualization platforms are supported:

  • VMware
  • XEN
  • Virtuozzo 7
  • OpenVZ
  • KVM
  • Hyper-V
  • LXC (Docker)

Notes:

  1. Support includes proper functioning of Plesk and applicability of discounted “virtual server” licenses
  2. License key may also restrict Plesk to selected platform. That means license key will be considered invalid in such environment, but other functions (installation, etc.) shall not be impacted.

Earlier Versions Supported for Upgrade

Plesk Obsidian supports upgrade from the following earlier versions:

  • Plesk Onyx 17.8 for Linux/Windows (x64 only)
  • Plesk Onyx 17.5 for Linux/Windows (x64 only)
  • Plesk Onyx 17.0 for Linux/Windows (x64 only)

Source Hosting Platforms Supported for Migration

Configuration and content from the following hosting platforms can be imported into Plesk Obsidian:

  • Plesk for Linux and Plesk for Windows: 8.6, 9.5, 10.4, 11.0, 11.5, 12.0, 12.5, and Plesk Onyx.
  • cPanel 64 and later
  • Confixx 3.3
  • Helm 3.2
  • Plesk Expand 2.3.2
  • Parallels Pro Control Panel for Linux 10.3.6

Learn about migrating to Plesk Obsidian.

Email Clients Supporting Mail Autodiscover

Plesk can automatically set up the following email clients:

  • Microsoft Outlook (except for Microsoft Outlook 2019 and O365)
  • Mozilla Thunderbird
  • Gmail
  • Apple Mail

Learn about email clients supporting mail autodiscover.

Supported Components

Supplied Components

Linux

Plesk Obsidian for Linux distribution packages include the following components:

  • Plesk Premium Antivirus 6.0.2
  • ImunifyAV
  • AWStats 7.7
  • ProFTPD 1.3.8c
  • qmail 1.03
  • Courier-IMAP 5.2.7
  • Postfix 3.5.25 (for most OSes)
  • Dovecot 2.3.20
  • Roundcube 1.6.7 (for OSes other than Red Hat Enterprise Linux 7, CentOS 7, CloudLinux 7.1, and Ubuntu 18.04)
  • phpMyAdmin 5.2.2
  • nginx 1.26.2
  • TLS 1.3 (in nginx for customers' websites)
  • PHP 8.4.6, 8.3.20, 8.2.28, 8.1.32, 8.0.30, 7.4.33, 7.3.33, 7.2.34, 7.1.33, 7.0.33, 5.6.40, 5.5.38, 5.4.45, 5.3.29, 5.2.17
    • Note: PHP versions earlier than 8.0 no longer receive security updates because they have been declared "end-of-life" by the product vendor.
  • Fail2ban 1.1.0
  • ModSecurity 3.0.14, 2.9.8
  • ModSecurity Rule Set 2.2.9-30-g520a94b
  • Resource Controller
  • Node.js 20, 18, 16, 14, 12
    Note: Plesk supports the latest stable and LTS releases of Node.js. Node.js 18 currently not supported on CentOS 7, Ubuntu 18.04, CloudLinux 7, and Red Hat Enterprise Linux 7.
  • Phusion Passenger 6.0.26
  • Ruby 3.2.1, 3.1.3, 3.0.5, 2.7.7, 2.6.3, 2.5.5, 2.4.6, 2.3.8, 2.2.10, 2.1.10
  • Bundler 1.13.5
  • Rootkit Hunter 1.4.4

Windows

Plesk Obsidian for Microsoft Windows distribution packages include the following components:

  • Plesk Premium Antivirus 6.0.2
  • ModSecurity 2.9.7
  • Microsoft SQL Server Express 2022, 2019, 2017, 2016 SP1, 2014 SP2, 2012 SP3
  • MariaDB 11.4.4 (for Plesk database)
  • MariaDB 11.4, 10.11.8, 10.6.18, 10.5.25, and 10.3.39 (for customer websites)
  • MailEnable Standard 10.51
  • PHP 8.4.6, 8.3.20, 8.2.28, 8.1.32, 8.0.30, 7.4.33, 7.3.33, 7.2.34, 7.1.33, 7.0.33, 5.6.40
    • Note: PHP versions earlier than 8.0 no longer receive security updates because they have been declared "end-of-life" by the product vendor.
  • ASP.NET Core 9.0.3, 8.0.14
  • .NET Core 3.1.3, 2.1.17
  • SpamAssassin 3.0-4.0.1
  • phpMyAdmin 5.0.3
  • AWStats 7.7
  • Webalizer V2.01-10-RB02 (Windows NT 5.2) English
  • Microsoft Web Deploy 3.5 + WebMatrix 3.0, 3.6
  • IIS URL Rewrite Module 7.2.1993
  • Node.js 20.18.2, 18.20.6
  • 7zip 18.05
  • Microsoft Visual C++ 2017 Redistributable

Supported Third-Party Components

Linux

Web servers:

  • Apache 2.4

DNS servers:

  • BIND 9.8 or higher

Web statistics:

  • Webalizer 2.x

Web scripting:

  • mod_perl 2.0.8

Database servers and tools:

  • MySQL 5.7, 8.0
  • MySQL community edition 5.7, 8.0 LTS
  • PostgreSQL 8.4–15
  • MariaDB 5.5 and later, MariaDB 10.6 LTS, Maria DB 11.4 LTS
  • MariaDB Connector 3.3.38
Note: Due to the changes to the MySQL and MariaDB release policies, LTS releases are supported as both remote and local database servers. Innovation releases are supported as remote database servers only. Plesk strives to introduce the support for stable MariaDB releases within one month of the release date.

Anti-spam tools:

  • SpamAssassin 3.0–3.4

Windows

This is a shortened list of supported third-party components. It does not include the components supplied with the Plesk distribution, as they were already mentioned as distributed and supported.

Web servers

  • Microsoft Internet Information Services (IIS) 10.0, 8.5, 8.0, 7.5

Mail servers

  • MailEnable Standard / Professional / Enterprise / Enterprise Premium 6.91–10.49
  • SmarterMail 100, 16.3
  • IceWarp Mail Server 12.0.3.1

Webmail tools

  • MailEnable Web Client
  • SmarterMail Web Client
  • IceWarp (Merak) Mail Server Web Client

Spam filtering tools

  • SmarterMail Spamfilter
  • IceWarp (Merak) Mail Server Anti-Spam

Antivirus tools

  • SmarterMail Anti-Virus
  • IceWarp (Merak) Mail Server Anti-Virus

DNS servers

  • Microsoft DNS Server

Web statistics

  • SmarterStats 11.1

Web scripting

  • ASP
  • ASP.NET 2.0-4.x
  • Python 3.13.2
  • Perl 5.40.0

Database servers

  • Microsoft SQL Server 2005–2022
  • MySQL community edition 5.7
  • MySQL ODBC connector 5.3.14
  • PostgreSQL 9.2 and later (remote database servers support only)
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