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VPS

/vee-pee-ess/noun

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In brief · quick answer

A Virtual Private Server (VPS) is a virtual machine with dedicated resources carved out of a physical server. You get guaranteed CPU, RAM, and storage without the cost of a full dedicated server.

§ 1 Definition

A VPS uses virtualization technology (like KVM or Xen) to partition a physical server into multiple isolated virtual machines. Each VPS runs its own operating system, has guaranteed resource allocations, and operates independently of other VPS instances on the same hardware. Unlike shared hosting, your site's performance doesn't tank when another tenant on the same physical machine gets busy. VPS sits between shared hosting and dedicated servers in both price and capability. You get root access, full control over the environment, and the ability to install any software you need.

§ 2 VPS vs Shared Hosting

The critical difference is resource isolation. In shared hosting, a single runaway script on another site can exhaust server memory and crash your site. A VPS guarantees your allocation. If your plan says 2 CPU cores and 4GB RAM, those resources are yours regardless of what other VPS tenants are doing. You also get root access, which means you can install custom software, modify system files, and configure the server exactly how you need it.

§ 3 Managed vs Unmanaged VPS

Unmanaged VPS gives you a blank server and you handle everything: updates, security patches, firewall configuration, monitoring, and troubleshooting. This is cheaper but demands sysadmin skills. Managed VPS includes server administration from the provider. They handle OS updates, security hardening, and basic monitoring. You focus on your application. If you don't have a dedicated sysadmin, choose managed.

§ 4 Common Uses

VPS is ideal for medium-traffic websites, web applications, API servers, game servers, development and staging environments, and any workload that needs consistent performance but doesn't justify a full dedicated server. It also works well for hosting multiple client sites under your own control.

§ 5 Note

Your VPS provider's virtualization type matters. KVM and Xen provide true hardware-level isolation. OpenVZ (container-based) shares the host kernel and is less secure. Always choose KVM if available.

§ 6 In code

```bash
# Connect to your VPS via SSH
ssh root@your-server-ip

# Check resource usage
htop

# View disk space
df -h

# Restart the web server
systemctl restart nginx
```

§ 7 Common questions

Q. How much RAM do I need for a WordPress VPS?: A. For a single WordPress site with moderate traffic, 2GB RAM is comfortable. For multiple sites or WooCommerce, aim for 4GB or more.
Q. Can I upgrade my VPS without downtime?: A. Most providers allow resizing, but it usually requires a reboot. Some modern setups allow live migration with minimal interruption.

Key takeaways

VPS gives you dedicated resources and root access at a fraction of dedicated server cost.
Resource isolation means your performance isn't affected by other tenants.
Choose managed VPS if you don't have server administration experience.
KVM-based virtualization is superior to OpenVZ for security and isolation.

How Atomic Glue helps

We deploy and harden VPS environments for clients who need more control and performance than shared hosting offers. We handle the security and maintenance so you don't have to. Get in touch.

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# VPS

A Virtual Private Server (VPS) is a virtual machine with dedicated resources carved out of a physical server. You get guaranteed CPU, RAM, and storage without the cost of a full dedicated server.

Category: Infrastructure

Author: Atomic Glue Editorial Team

## Definition

## VPS vs Shared Hosting

## Managed vs Unmanaged VPS

**Unmanaged VPS** gives you a blank server and you handle everything: updates, security patches, firewall configuration, monitoring, and troubleshooting. This is cheaper but demands sysadmin skills. **Managed VPS** includes server administration from the provider. They handle OS updates, security hardening, and basic monitoring. You focus on your application. If you don't have a dedicated sysadmin, choose managed.

## Common Uses

## Note

Your VPS provider's virtualization type matters. KVM and Xen provide true hardware-level isolation. OpenVZ (container-based) shares the host kernel and is less secure. Always choose KVM if available.

## In code

## Common questions
Q: How much RAM do I need for a WordPress VPS?
A: For a single WordPress site with moderate traffic, 2GB RAM is comfortable. For multiple sites or WooCommerce, aim for 4GB or more.
Q: Can I upgrade my VPS without downtime?
A: Most providers allow resizing, but it usually requires a reboot. Some modern setups allow live migration with minimal interruption.

## Key takeaways

VPS gives you dedicated resources and root access at a fraction of dedicated server cost.
Resource isolation means your performance isn't affected by other tenants.
Choose managed VPS if you don't have server administration experience.
KVM-based virtualization is superior to OpenVZ for security and isolation.

## Related entries

Last updated July 2026. Permalink: atomicglue.co/glossary/vps