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docs: turning on Convox's system-env-disable #194

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ndbroadbent merged 2 commits into from
Oct 26, 2026
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docs: turning on Convox's system-env-disable #194

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docs: turning on Convox's system-env-disable: the name=value format, …
ndbroadbent Oct 26, 2026
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docs: the gate removes Convox's RACK, not one you set; rotate the rac…
ndbroadbent Oct 26, 2026
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7 changes: 6 additions & 1 deletion docs/src/content/docs/security/hardening.mdx
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Expand Up @@ -194,7 +194,12 @@ only when it's run with `--write`. See [Env vars](/user-guide/cli/commands/#env-
Convox gives every app process `RACK_URL`, which holds the rack's API password, unless the rack's
`system-env-disable` feature gate is on. The gateway keeps it from every command it runs, but the app's own
processes still have it, and an `exec` can read it from the process it runs in. The gate also removes `RACK`, which
the gateway reads, so set `RACK` on the gateway app before turning the gate on.
the gateway reads, so set `RACK` on the gateway app (and any other app that reads it) before turning the gate on:
`convox rack params set api_feature_gates=system-env-disable=true`, or `api_feature_gates =
"system-env-disable=true"` in the rack's Terraform. Convox reads each gate as `name=value` and ignores a bare name.
New processes stop getting Convox's `RACK` and `RACK_URL` at once (a `RACK` you set yourself stays); running ones
keep them until their app's next promote. Then rotate the rack's API password, which every process could read until
now, and set the gateway's `RACK_TOKEN` to the new one.

### Secret Storage

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