What Is Docker? VPS Plans That Run Container Workloads

Shared, Reseller, and cPanel WordPress plans do not support the Docker daemon. This article explains how containers work, which InMotion VPS configurations are appropriate, and how to size your environment so it actually performs.

What Is Docker in Plain Terms?

Docker packages an application with everything it needs to run, including the runtime, libraries, system tools, and configuration files. The result is a container that behaves the same way on a developer laptop, a staging VPS, and a production server.

Containers are not virtual machines. A VM emulates an entire operating system on top of a hypervisor. A container shares the host kernel and isolates only the user space using Linux primitives like namespaces and cgroups. According to the official Docker documentation, this design lets you run many containers on a single host with far less overhead than running an equal number of VMs.

The core pieces of the ecosystem are simple:

• Docker Engine: the daemon that builds and runs containers
• Images: read-only templates that contain your app and its dependencies
• Containers: running instances of an image
• Docker Compose: a tool for defining multi-container applications in a single YAML file
• Registries: image storage, with Docker Hub being the public default

How Does Docker Differ From Traditional Hosting?

Traditional hosting installs software directly onto the server filesystem. PHP, MySQL, and Apache live in /etc and /usr, and they share libraries with everything else on the box. Upgrading one application can break another. This is one of the reasons shared hosting plans lock down what users can install.

Docker flips that model. Each container brings its own libraries and runtime. A Node 18 app and a Node 22 app run side by side without conflicting, because each one carries its own version inside the image. You can also tear down a container in seconds and replace it with a known-good image, which is far cleaner than reinstalling packages on a live server.

That isolation is the point. Containers give you a reproducible deployment unit. The same image you tested locally is the image that runs in production.

Why Run Containers Instead of Installing Software Directly?

A few practical reasons that come up on real projects:

• Version pinning that actually holds: Container images lock the exact versions of PHP, Node, Python, Postgres, or anything else your stack depends on. No accidental package updates breaking a live site.
• Faster onboarding: A developer joining your team can run docker compose up and get the full environment running in minutes, instead of spending half a day chasing dependencies.
• Easier rollbacks: If a deploy goes sideways, you can revert to the previous image tag. There is no need to uninstall and reinstall packages on the host.
• Cleaner host servers: Your VPS stays minimal. The host runs Docker, a firewall, and SSH. Everything else lives inside containers.

That predictability is why agencies and SaaS teams have moved a lot of internal tooling, staging environments, and microservices into containers.

Which InMotion VPS Plans Support Docker?

The short answer is any plan that gives you root access on a supported Linux distribution. On InMotion’s lineup, that means Cloud VPS, which provisions on AlmaLinux 9, Ubuntu 22.04 LTS, or Debian 12. All three are first-class targets for Docker Engine and Docker Compose.

Here is how the major plan types compare for container workloads:

Plan Type	Root Access	Docker-Friendly?	Notes
Shared Hosting (Launch, Pro)	No	No	No daemon control, kernel is shared with other accounts
WordPress Hosting (cPanel)	No	No	Single-purpose stack, no container support
Reseller Hosting	No	No	Built for cPanel multi-tenancy, not containers
Cloud VPS (unmanaged)	Yes	Yes	The natural fit. AlmaLinux 9, Ubuntu 22.04, or Debian 12
Managed VPS (cPanel)	Yes (with caveats)	Possible but not ideal	cPanel and Docker do not integrate cleanly
Dedicated Servers	Yes	Yes	Best for high-density container deployments

Cloud VPS is the right starting point for most development teams. You get a clean Linux install, full root, and no preinstalled control panel to work around. Install Docker Engine following Docker’s official instructions for your distribution and you are running in under ten minutes.

What About Managed VPS With cPanel?

Managed VPS plans on InMotion run cPanel and WHM, which is excellent for hosting traditional websites and email but adds friction for container work. cPanel expects to control Apache, PHP-FPM, MySQL, exim, and other services directly. Layering Docker on top is technically possible because you still have root, but you are running two competing management systems on the same host.

In practice, teams that want both a managed cPanel environment and containers usually run them on separate machines. A common pattern: cPanel-managed VPS for client websites, plus a smaller Cloud VPS for Docker-based tools like a private Git instance, monitoring stack, or staging environment.

If you only have budget for one server and you want containers, skip the control panel and run Cloud VPS instead.

Cloud VPS vs Dedicated Server for Container Workloads

A Cloud VPS is virtualized infrastructure carved out of a larger host. You share underlying hardware with other tenants but have guaranteed CPU and RAM allocations. A Dedicated Server is an entire physical machine assigned to you alone.

For containers, the choice usually comes down to density and isolation requirements:

• Cloud VPS works well for running a handful of containers per project, staging environments, or small production workloads. You can scale vertically by moving to a larger plan when your container count or resource usage grows.
• Dedicated Servers are the right call when you need to run dozens of containers, host databases that benefit from local NVMe performance, or meet compliance requirements that prohibit shared hypervisors. InMotion’s Essential tier ($99.99/mo) ships with 64GB DDR4 RAM and dual 1.92TB NVMe SSD, which is enough capacity for a meaningful container fleet.

InMotion uses software RAID via mdadm across these plans, which is standard for Linux server environments and works without any special configuration for Docker.

Requirements for Running Docker on a VPS

The baseline is modest. Docker Engine itself needs roughly 200MB of RAM and minimal CPU when idle. The real resource budget goes to the containers you run on top of it.

A reasonable starting point for sizing:

• Small services (nginx, redis, lightweight APIs): 50-200MB RAM per container
• Node.js or Python web apps: 150-500MB depending on framework
• PHP-FPM with a single WordPress site: 256-512MB
• PostgreSQL or MySQLwith moderate traffic: 512MB to 2GB minimum
• Self-hosted apps like Nextcloud or Mattermost: 1-2GB

Disk usage matters too. Container images, volumes, and build cache add up quickly. Set aside at least 30-50GB on a starter Cloud VPS, and monitor it with docker system df (documentation).

You will also need:

• A supported Linux distribution. InMotion Cloud VPS offers AlmaLinux 9, Ubuntu 22.04 LTS, and Debian 12, all of which Docker officially supports
• Outbound network access for pulling images from registries
• An SSH key for secure access (password auth should be disabled)
• A firewall rule strategy, since Docker manipulates iptables and can conflict with naive firewall configurations

Common Docker Use Cases on a VPS

A few patterns that show up frequently:

• Self-hosted developer tools: GitLab, Gitea, Drone CI, Vaultwarden, and similar tools deploy cleanly as containers
• Application backends: Node.js, Python, or Go APIs sitting behind a reverse proxy
• Staging environments: Spin up an exact copy of production from the same image set
• Microservice architectures: Multiple small services coordinated through Docker Compose
• Reverse proxy with automatic SSL: Traefik or Caddy in a container handles ingress and Let’s Encrypt certificates for everything else on the host
• Database isolation: Run separate PostgreSQL or MySQL instances per project without polluting the host

For agencies, a single Cloud VPS often hosts a Traefik reverse proxy plus a dozen client staging environments, each isolated in its own container set. Agencies serving multiple clients should also look at the InMotion Agency Partner Program for tiered hosting benefits.

Performance Factors That Affect Container Workloads

Container performance on a VPS depends on more than raw specs. A few things to watch:

• Disk I/O: Containers that write heavily (databases, log aggregators) benefit from NVMe-backed VPS plans. Spinning disk is a bottleneck even with plenty of RAM.
• Memory pressure: When you exceed available RAM, the kernel starts swapping or the OOM killer terminates containers. Both are bad. Size up before you hit 80 percent sustained usage.
• Network: Inter-container traffic on the same host stays on the loopback interface and is fast. Cross-host traffic depends on your VPS network. Real-time apps care about this; CRUD apps usually do not.
• CPU steal time: On shared hypervisor infrastructure, watch %st in top or vmstat. Sustained steal time over a few percent means the host is oversubscribed.
• Image layer caching: Building images on the same VPS as your registry cache is much faster than pulling from a remote source every time. Use multi-stage builds to keep production images lean.

Cost Considerations Beyond the Sticker Price

The monthly VPS rate is only part of the bill. Other line items worth budgeting:

• Backups: InMotion’s Premier Care for VPS includes 300GB of backup storage, which covers most container workloads. Plan to back up volumes, not just the host filesystem.
• Bandwidth overage: Most container deployments are modest on egress, but image-heavy CI pipelines or media servers can push the limits.
• Image registry storage: Docker Hub free tier limits pull rates. A team account or a self-hosted registry on the VPS itself avoids that.
• Monitoring: Free tools (Prometheus, Grafana, Uptime Kuma) run in containers and cost nothing beyond their RAM footprint.
• Migration time: Moving from one VPS to another with containers is faster than traditional hosting, but factor in DNS propagation and SSL renewal time.

This is where costs usually creep up. Container density looks cheap until you run out of RAM at 2 a.m. and need to scale up immediately.

Common Mistakes When Deploying Docker on a VPS

Patterns that cause problems in production:

• Running everything as root inside the container: Containers should drop privileges with a USER directive in the Dockerfile
• Storing data inside the container: Use named volumes or bind mounts so data survives container restarts and image updates
• No resource limits: Without –memory and –cpus flags or Compose equivalents, one runaway container can starve everything else
• Ignoring image size: A 2GB Node image rebuilds slowly and burns disk. Multi-stage builds and slim base images keep this under control.
• Skipping log rotation: Docker’s default JSON log driver writes unbounded files. Configure max-size and max-file or ship logs elsewhere.
• Conflicting firewalls: Docker writes iptables rules that ufw and firewalld can override. Pick one approach and stick with it.

Most of these are fixable in five minutes once you know to look for them.

When to Move Beyond a VPS

A single Cloud VPS handles a surprising amount of container workload. The signals that you need to scale up or out:

• Sustained CPU above 75 percent across multiple containers
• Memory at or near plan limits with no headroom for spikes
• Disk I/O wait climbing above 10 percent in iostat
• Container restart loops triggered by resource exhaustion
• Compliance requirements that need dedicated hardware
• Multi-region deployments where latency to a single data center matters

When you hit those thresholds, the path forward is usually a larger VPS first, then a Dedicated Server with more cores and RAM, and eventually a multi-server setup with a real orchestrator like Kubernetes or Docker Swarm. Most teams do not need orchestration until they are running across several physical machines.

Ready to Run Containers? If you want to run Docker on infrastructure that gives you root access, predictable performance, and 24/7 human support, InMotion’s Cloud VPS lineup is the right starting point. Pick the smallest plan that fits your initial resource budget, and scale up when your monitoring tells you to.Explore InMotion Cloud VPS plans ?