Layer 3 · self-hosting reality check
What it actually takes to self-host Colima
The docs say 2 GB. In practice you want 4 GB allocated to the VM, on a 16 GB machine. Here is the honest version — real requirements, real monthly cost, what you will be maintaining, and the one thing that catches people out.
Usually reached from Docker Desktop alternatives, where Colima is one of the picks.
Wondering whether you need to at all? Is Docker Desktop free? — what the free tier actually allows, and where the wall is.
| RAM — documented minimum | 2 GB |
|---|---|
| RAM — what it really needs | 4 GB allocated to the VM, on a 16 GB machine |
| CPU | 2 vCPU for the VM; more only if you run heavy containers |
| Disk | 60 GB VM disk is the sensible default — it does not grow on demand |
| Monthly cost | $0 — it runs on the machine you already own |
| Setup time | 10 minutes |
| How you install it | brew install colima docker, then `colima start` |
| Ongoing maintenance | Low. It is a VM manager; you update it like any other CLI tool. |
| Where it stops scaling | A full local development stack. It is a workstation tool and does not belong on a server. |
The thing that catches people out
The VM disk is fixed at creation and Colima will not grow it later. The default is 60 GB and people accept it, fill it with images six months on, and discover the only fix is deleting the VM and starting again. Set `--disk` to what you will actually need on day one, and run `docker system prune` on a schedule rather than when it breaks.
When not to self-host Colima
You need Docker Desktop's GUI, its Kubernetes toggle, or the extensions marketplace. Colima is a daemon with a CLI and nothing else.
Every guide here carries this section. A site that only ever tells you to self-host is selling something — the useful answer is sometimes no.
Other Layer 3 self-hosting guides
Common questions
- How much RAM does Colima actually need?
- 4 GB allocated to the VM, on a 16 GB machine in practice. The documented minimum is 2 GB, which is the figure at which the process starts rather than the figure at which it works under real use. 2 vCPU for the VM; more only if you run heavy containers alongside it.
- What does self-hosting Colima cost per month?
- $0 — it runs on the machine you already own This is commodity VPS pricing and excludes your time, which is the larger cost for most people — budget for low. It is a VM manager; you update it like any other CLI tool.
- How long does it take to set up Colima?
- 10 minutes, via brew install colima docker, then `colima start`.
- When should I NOT self-host Colima?
- You need Docker Desktop's GUI, its Kubernetes toggle, or the extensions marketplace. Colima is a daemon with a CLI and nothing else.
- What is the most common mistake when self-hosting Colima?
- The VM disk is fixed at creation and Colima will not grow it later. The default is 60 GB and people accept it, fill it with images six months on, and discover the only fix is deleting the VM and starting again. Set `--disk` to what you will actually need on day one, and run `docker system prune` on a schedule rather than when it breaks.