VPS Buying Guides
VPS for Docker: RAM, Storage and Security Before You Buy
A VPS for Docker should be sized for the applications inside the containers, plus the database, image storage, and operating system. Counting containers alone is not useful: three lightweight services can use less memory than one busy application. Start with a small deployment inventory, then test the complete stack before moving production traffic.
This guide focuses on small Linux application deployments. Resource examples are planning exercises, not benchmarks or guaranteed capacities. Confirm the selected VPS operating system, resource-use policy, and current plan details before ordering.
1. Budget memory for the whole stack
Write down each service and its expected peak memory use. Include the web application, database, cache, reverse proxy, monitoring, and any background workers. Add headroom for deployments and maintenance. Building an image on the same VPS can create a short but significant memory and CPU peak; building elsewhere and pulling the result may be a better fit for a small server.
| Example component | Illustrative memory budget |
|---|---|
| Application and worker | 700 MB |
| Database | 600 MB |
| Proxy and monitoring | 150 MB |
| Host and Docker services | 350 MB |
| Extra headroom | 600 MB |
| Total planning budget | 2,400 MB |
In this hypothetical example, a 2 GB VPS would be too tight. A 4 GB candidate gives room to test, but the real decision depends on measured usage. Do not interpret unused RAM as a problem: a reserve helps absorb traffic bursts and maintenance. If your workload includes WordPress, see our WordPress VPS memory guide.
2. Include image layers, volumes, and logs in storage
The application’s source code is only part of the disk budget. Container images, previous releases, database volumes, uploaded files, and logs accumulate independently. Allow enough free space to pull a new image while the old release is still available for rollback. Keep a separate backup destination rather than filling the same VPS with its only recovery copies.
sudo docker system df
sudo docker stats --no-stream
df -hThese are inspection commands for a host with Docker already installed. Review what is using space before any cleanup. A volume can contain the only copy of an application’s database; deleting containers and deleting persistent data are different operations. For a full filesystem, follow our Linux disk-space troubleshooting guide.
3. Install on a supported host and control exposed ports
Use the official Docker installation instructions for your exact OS release. Review existing runtime packages before changing a production host. Docker documents firewall interactions: published container ports can bypass rules you expected UFW to enforce. Verify exposure from outside the server as well as from the host itself.
For an application behind a reverse proxy running on the host, a Compose port mapping can bind the application to loopback:
services:
app:
# Add your actual image and application settings.
ports:
- "127.0.0.1:8080:8080"This is a configuration fragment, not a runnable application. It assumes the container listens on port 8080. With a current supported Docker version, this mapping is intended for host-local access. If the reverse proxy is another container, use a shared Docker network and the service name instead: that proxy’s loopback is not the host. Review Docker port-publishing behavior and test your actual setup. Keep database ports unpublished unless a specific, restricted access design requires otherwise.
4. Choose the region after checking the application path
Consider both visitors and dependencies. An application that frequently calls a remote database may be affected by that connection even when visitors are nearby. Co-locate closely coupled services where practical, and test representative requests rather than choosing solely from a map.
TudCloud lists Hong Kong and Seattle VPS options. Use our Hong Kong buying guide and Seattle plan comparison to shortlist a region, then confirm current resources on the product page.
5. Prove the deployment can recover
- Restart the application and verify that required data survives.
- Back up persistent data using a method appropriate to its database or application.
- Restore into a separate test environment, with outbound notifications disabled.
- Test an application update and the rollback procedure before relying on it.
- Monitor memory pressure, disk growth, failed health checks, and restart loops.
Docker VPS FAQ
How many containers can a 2 GB VPS run?
There is no fixed number. Measure the services, not the container count. A small static stack and an application with a database can have very different needs.
Does a restart policy replace backups?
No. Restarting a process does not recreate lost data or reverse an unwanted database change.
Choose a VPS for your application
Build the resource budget first, select a region that fits the request path, and compare the live plans below. Ask support about sustained CPU-heavy workloads before ordering; containerization does not remove shared-resource policies.