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Harden Docker distributed Erlang startup #3

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Merged
homerquan merged 1 commit into from
May 18, 2026
Merged

Harden Docker distributed Erlang startup #3

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4 changes: 2 additions & 2 deletions Dockerfile
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Expand Up @@ -44,7 +44,7 @@ COPY . .
# Compile the application
RUN mix compile

EXPOSE 50051 4369 9000-9010
EXPOSE 50051

# Set the default command
CMD ["sh", "-c", "if [ -n \"$MN_NODE_NAME\" ]; then elixir --name $MN_NODE_NAME --cookie ${MN_COOKIE:-mirrorneuron} --erl \"-kernel inet_dist_listen_min 9000 inet_dist_listen_max 9010\" -S mix run --no-halt; else mix run --no-halt; fi"]
CMD ["sh", "-c", "if [ -n \"$MN_NODE_NAME\" ]; then if [ -z \"$MN_COOKIE\" ] || [ \"$MN_COOKIE\" = \"mirrorneuron\" ]; then echo \"MN_COOKIE must be set to a non-default secret when MN_NODE_NAME enables distributed Erlang\" >&2; exit 1; fi; exec elixir --name \"$MN_NODE_NAME\" --cookie \"$MN_COOKIE\" --erl \"-kernel inet_dist_listen_min 9000 inet_dist_listen_max 9010\" -S mix run --no-halt; else exec mix run --no-halt; fi"]
2 changes: 1 addition & 1 deletion README.md
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Expand Up @@ -147,7 +147,7 @@ Runtime configuration is read from environment variables in `config/runtime.exs`
| Variable | Default | Description |
|---|---|---|
| `MN_ENV` | `dev` | Runtime environment. Must be `dev`, `test`, or `prod`. |
| `MN_COOKIE` | `mirrorneuron` | Erlang distribution cookie. |
| `MN_COOKIE` | `mirrorneuron` in local development | Erlang distribution cookie. Set a strong, non-default value before enabling distributed Erlang with `MN_NODE_NAME` or running in production. |
| `MN_NODE_NAME` | Not set by config | Erlang node name used by release/cluster scripts. |
| `MN_CLUSTER_NODES` | Empty | Comma-separated Erlang node names for cluster discovery. |
| `MN_RELIABILITY_STRATEGY` | `auto` | Conservative runtime strategy resolver for new jobs. |
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