How to host multiple WordPress sites on one VPS

Quick answer: One VPS can host many WordPress sites: give each site its own directory, database, DB user and web-server vhost, and add roughly 1–2 GB RAM per active site. Keep sites isolated (separate DB credentials, ideally separate PHP-FPM pools) so one compromised or overloaded site can’t take down the rest.

Overview

Consolidating sites on a single VPS cuts cost and simplifies maintenance — one server to update, one backup job, one firewall. The trade-off is shared fate: size the server for the sum of the sites and isolate them properly. This is the standard setup for freelancers and agencies (see agency best practices).

Before you start

• A VPS sized for the total load — see choosing a VPS; 4 GB RAM comfortably runs 2–4 typical sites.
• A working stack (manual) or a control panel like CloudPanel, which automates vhosts per site.
• DNS access for every domain you’re adding.

Step-by-step guide

1. Create a directory per site: /var/www/site1.com, /var/www/site2.com…
2. Create a separate database and DB user per site — never share one DB user across sites.
3. Add a server block (vhost) per domain; with a panel this is the “add website” button.
4. Optionally create one PHP-FPM pool per site with its own pm.max_children, so a runaway site hits its own limit instead of exhausting the server:

   sudo cp /etc/php/8.3/fpm/pool.d/www.conf /etc/php/8.3/fpm/pool.d/site2.conf
   # edit: [site2], listen = /run/php/php8.3-fpm-site2.sock, pm.max_children = 10
   sudo systemctl reload php8.3-fpm

5. Issue SSL per domain (guide) and include every site in the backup job.

Common issues

• One site slows down all of them: no per-site FPM pools — add them, and find the culprit with top and the slow-query log.
• RAM exhaustion as sites are added: each active site adds PHP workers and DB working set — watch free -h and upgrade before swapping starts.
• Cross-site infection: all sites under one Linux user with shared write access — tighten permissions or use a panel that separates site users.

When to contact support

If you’re planning to consolidate many sites and aren’t sure one VPS is enough — or whether several smaller VPS would isolate clients better — open a ticket with the site list and traffic estimates.

Frequently asked questions

How many WordPress sites fit on one VPS?

As a rule of thumb, plan 1-2 GB RAM per active site plus headroom for the database: a 4 GB VPS runs 2-4 typical sites, an 8 GB plan comfortably hosts 5-8 lean ones.

Should I use WordPress multisite or separate installs?

Separate installs are safer for unrelated sites: independent plugins, backups and failure domains. Multisite suits a network of closely related sites managed as one product.

How do I stop one site from slowing down the others?

Give each site its own PHP-FPM pool with capped workers and its own database user, then monitor with top and the MariaDB slow-query log to catch the heavy site early.

Related articles

• How to choose a VPS for WordPress
• WordPress hosting for agencies: best practices
• How to migrate multiple WordPress sites
• How to optimize PHP for WordPress

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