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# The gateway and its API front
The long form of the gateway sections of the README: the deploy script's environment, the gateway's API front, the caddy sites and the post-deploy sign-in. Short path in [the README](../README.md#use-the-hosted-gateway).
A development gateway is a child of a market network: start the network with `--with-gateway`.
A production gateway is built as a release, shipped, and installed or upgraded with `scripts/deploy.sh`, which also writes the caddy sites.
```bash
BINARY=<release binary> SHA256=<its sha256> SSH_KEY=~/.ssh/id_ed25519_no_password \
GATEWAY_ENV_FILE=~/.tmp/deploy/gateway.env GATEWAY_SPEC_FILE=~/.tmp/deploy/gateway-spec.yaml scripts/deploy.sh
```
[Deploying a release to production](deploy.md#deploying-a-release-to-production) builds that binary and computes its sha256.
`scripts/deploy.sh` reads these environment variables:
| Variable | Meaning | Default |
|---|---|---|
| `BINARY` | The release binary to ship. Unset: the script builds the current commit. | |
| `SHA256` | The published sha256 of `BINARY`; a mismatch stops the deploy. | |
| `SSH_KEY` | The SSH key for the deploy host. | |
| `SSH_TARGET` | The deploy host. | `root@socialweb.computer` |
| `SSH_PORT` | The deploy host's SSH port. | `1997` |
| `ACCOUNT` | The account the gateway runs as. | `socialweb` |
| `STATE_DIR` | The gateway's state directory. | `/var/lib/socialweb-computer/socialweb` |
| `DOMAIN` | The base domain. | `socialweb.computer` |
| `ORIGIN` | The gateway API's host. | `k8s.<DOMAIN>` |
| `KCP_ORIGIN` | The kcp host. | `kcp.<DOMAIN>` |
| `GATEWAY_ENV_FILE` | The gateway's environment file, shipped as `gateway.env`. | |
| `GATEWAY_SPEC_FILE` | A YAML `GatewaySpec`, shipped as the Gateway spec. | |
| `ALLOW_DEV_BINARY` | Pass `--allow-dev-binary` to `install gateway` and `upgrade`. | off |
The script installs the gateway on its first run. On every later run it upgrades the gateway, then runs `install gateway` again with the new `bin/current`, which re-renders the unit files and restarts a core whose unit changed. `k8s.<domain>` proxies the gateway's web-app front on `127.0.0.1:8788`, which serves the GatewayAPI component: `/oauth/*`, `/session`, `/api/*`, `/xrpc/computer.socialweb.k8s.*` and `/downloads/*`. The gateway is API-only; `/` answers 404.
After a fresh deploy the requester account has no gateway session, so cluster claims fail with a `no oauth session stored` message. Sign in with [OAuth sign-in](oauth.md), `--url https://k8s.socialweb.computer/` and `--start-api`.
## See also
- [Deploy a release](deploy.md)
- [OAuth sign-in](oauth.md)
