Layer 3 · self-hosting reality check
What it actually takes to self-host Unleash
The docs say 512 MB. In practice you want 2 GB. 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 LaunchDarkly alternatives, where Unleash is one of the picks.
Wondering whether you need to at all? Is LaunchDarkly free? — what the free tier actually allows, and where the wall is.
| RAM — documented minimum | 512 MB |
|---|---|
| RAM — what it really needs | 2 GB |
| CPU | 2 vCPU |
| Disk | Small |
| Monthly cost | $12–24/mo plus Postgres, against per-seat feature-flag pricing |
| Setup time | 1 hour |
| How you install it | container plus PostgreSQL |
| Ongoing maintenance | Low. |
| Where it stops scaling | Very well. Client-side evaluation means the server handles configuration, not traffic. |
The thing that catches people out
The SDKs cache flag state locally and evaluate in-process, which is what makes them fast and resilient — but it also means a flag change is not instant everywhere, and a dead Unleash server leaves clients serving their last-known state indefinitely. That is usually the behaviour you want; make sure it is the behaviour you expect, especially for a kill switch you are relying on to stop something quickly.
When not to self-host Unleash
You need enterprise governance — approval workflows, change requests, SSO — which live in the paid tiers rather than the open-source core.
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 Unleash actually need?
- 2 GB in practice. The documented minimum is 512 MB, which is the figure at which the process starts rather than the figure at which it works under real use. 2 vCPU alongside it.
- What does self-hosting Unleash cost per month?
- $12–24/mo plus Postgres, against per-seat feature-flag pricing This is commodity VPS pricing and excludes your time, which is the larger cost for most people — budget for low.
- How long does it take to set up Unleash?
- 1 hour, via container plus PostgreSQL.
- When should I NOT self-host Unleash?
- You need enterprise governance — approval workflows, change requests, SSO — which live in the paid tiers rather than the open-source core.
- What is the most common mistake when self-hosting Unleash?
- The SDKs cache flag state locally and evaluate in-process, which is what makes them fast and resilient — but it also means a flag change is not instant everywhere, and a dead Unleash server leaves clients serving their last-known state indefinitely. That is usually the behaviour you want; make sure it is the behaviour you expect, especially for a kill switch you are relying on to stop something quickly.