Practical hosting guide
Planning Docker on a Linux VPS
Build a maintainable container deployment with a supported OS, persistent data and controlled network exposure.
Choose a supported Linux environment
Choose a Linux image and CPU architecture supported by Docker. Check the official installation guide for compatible releases and use an image available in your VPS configuration.
For Ubuntu, use the official Docker Engine installation guide and its supported repository method. Review conflicting packages before changing an existing installation.
Verify the installation before deployment
Follow the vendor’s package installation steps, then check the service and run the supplied test image. On an appropriate Ubuntu installation, the documented checks include sudo systemctl status docker and sudo docker run hello-world.
After checking the engine, test your application’s health checks, persistent data and behaviour after a restart.
Protect persistent data and exposed ports
Use persistent volumes or clearly documented bind mounts for databases and uploaded files. Back up the application data consistently and keep a copy outside the VPS; a container image alone is not a data backup.
Docker warns that published container ports can bypass UFW or firewalld rules. Review Docker’s firewall guidance and test externally which ports are reachable. Do not publish a database port unless it is required and access is appropriately restricted.
Plan upgrades and recovery
Pin suitable image versions, protect secrets and review upstream security updates. Test new images against a separate copy of the data. Keep the previous configuration and a compatible recovery point so a failed update can be reversed.
Measure total resource use across the engine, application and database. Choose a VPS size from the actual workload rather than the container count.
