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waxx

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tweaks

6670896 · gmorell · 2026-05-21 13:47

2 files +29 -32

Files changed

modified rel/env.sh.eex

+29 −32

@@ -1,39 +1,36 @@

1	1	#!/bin/sh
2		−# Sourced by every `bin/waxx <command>` invocation. Only `start` and
3		−# `daemon` need long-name distribution — they're the long-lived
4		−# server nodes peer pods talk to. `remote`, `eval`, and `rpc` use
5		−# unique auto-generated short names so they don't fight the running
6		−# server for the `waxx@<pod-ip>` slot in epmd. Setting RELEASE_NODE for
7		−# those would cause an epmd name collision: the new (short-lived)
8		−# BEAM registers under the same name, evicts the running server from
9		−# epmd, and now peer pods can't find it via dist any more — which
10		−# typically takes the running pod down on its next inbound connect.
	2	+# Sourced by every `bin/waxx <command>` invocation. We always set
	3	+# `RELEASE_NODE` when `POD_IP` is available because every subcommand
	4	+# needs to know the running release's node name:
	5	+#
	6	+# - `start` / `daemon` register the running server under this name.
	7	+# - `remote` / `eval` / `rpc` pass it to `-remsh` (or RPC dial) to
	8	+# attach to the running server. The temporary BEAM those commands
	9	+# spawn picks its OWN unique short name (`rem-<rand>@<host>`),
	10	+# so setting RELEASE_NODE here does not cause an epmd collision —
	11	+# it only tells the temporary BEAM which target to talk to.
	12	+#
	13	+# Only `start` / `daemon` get the dist port pinned, since the
	14	+# temporary BEAMs for remote/eval/rpc only make outbound connections
	15	+# and don't need their own listener at a known port.
11	16	#
12	17	# POD_IP comes from the deployment's downward API. RELEASE_COOKIE
13		−# comes from the elixir-args / waxx-secrets secret so every replica
14		−# agrees on the Erlang cookie.
	18	+# comes from the waxx-secrets Secret so every replica agrees on the
	19	+# Erlang cookie.
	20	+
	21	+if [ -n "${POD_IP:-}" ]; then
	22	+ export RELEASE_DISTRIBUTION=name
	23	+ export RELEASE_NODE="waxx@${POD_IP}"
	24	+else
	25	+ echo "[env.sh] POD_IP is empty — falling back to default short-name distribution" >&2
	26	+fi
	27	+
15	28	case ${RELEASE_COMMAND:-} in
16	29	start\|daemon)
17		− if [ -n "${POD_IP:-}" ]; then
18		− echo "[env.sh] starting with name distribution as waxx@${POD_IP}" >&2
19		− export RELEASE_DISTRIBUTION=name
20		− export RELEASE_NODE="waxx@${POD_IP}"
21		−
22		− # Pin the inet_dist listener to a known port so it's predictable
23		− # from peers and routable through any future NetworkPolicy.
24		− # Without this BEAM picks a random ephemeral port each boot,
25		− # which works under default k8s pod-to-pod TCP but breaks the
26		− # moment a policy locks the namespace down.
27		− export ELIXIR_ERL_OPTIONS="${ELIXIR_ERL_OPTIONS:-} -kernel inet_dist_listen_min 9100 inet_dist_listen_max 9100"
28		− else
29		− echo "[env.sh] POD_IP is empty — falling back to local-only sname distribution" >&2
30		− fi
31		− ;;
32		− *)
33		− # remote / eval / rpc — let mix release auto-pick a unique short
34		− # name (`rem-<rand>@127.0.0.1`) and use `-remsh` to attach by the
35		− # running node's long name (which it reads from this same script's
36		− # state under start, baked into the release at build).
37		− :
	30	+ echo "[env.sh] starting with name distribution as ${RELEASE_NODE:-(unset)}" >&2
	31	+ # Pin the inet_dist listener so the port is predictable from peers
	32	+ # and matches the headless service / any future NetworkPolicy.
	33	+ # Without this BEAM picks a random ephemeral port each boot.
	34	+ export ELIXIR_ERL_OPTIONS="${ELIXIR_ERL_OPTIONS:-} -kernel inet_dist_listen_min 9100 inet_dist_listen_max 9100"
38	35	;;
39	36	esac

Parents: ffe9912