feat: k8s-friendly project templates

priv/templates/nova.template

@@ -24,3 +24,5 @@
 {file, "nova/controller.dtl", "{{name}}/src/views/{{name}}_main.dtl"}.
 {file, "nova/.tool-versions", "{{name}}/.tool-versions"}.
 {file, "nova/.gitignore", "{{name}}/.gitignore"}.
+{template, "nova/Dockerfile", "{{name}}/Dockerfile"}.
+{file, "nova/.dockerignore", "{{name}}/.dockerignore"}.

priv/templates/nova/.dockerignore

@@ -0,0 +1,10 @@
+_build
+.rebar3
+.rebar
+.git
+log
+logs
+erl_crash.dump
+rebar3.crashdump
+*.beam
+*.o

priv/templates/nova/Dockerfile

@@ -0,0 +1,29 @@
+ARG ERLANG_VERSION
+ARG REBAR_VERSION
+
+FROM erlang:${ERLANG_VERSION} AS builder
+
+RUN wget -q "https://github.com/erlang/rebar3/releases/download/${REBAR_VERSION}/rebar3" -O /usr/local/bin/rebar3 && \
+    chmod +x /usr/local/bin/rebar3
+
+WORKDIR /app
+
+COPY rebar.config rebar.lock ./
+RUN rebar3 compile --deps_only
+
+COPY . .
+RUN rebar3 as prod release
+
+FROM debian:bookworm-slim
+
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends libncurses5 libssl3 libstdc++6 && \
+    rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+COPY --from=builder /app/_build/prod/rel/{{name}} ./
+
+EXPOSE 8080
+
+CMD ["bin/{{name}}", "foreground"]

priv/templates/nova/prod_sys.config.src

@@ -5,11 +5,12 @@
            {logger_level, info},
            {logger,
             [{handler, default, logger_std_h,
-              #{level => error,
-                config => #{file => "log/erlang.log"}}}
+              #{formatter => {nova_jsonlogger, #{new_line => true}}}}
             ]}
           ]},
  {nova, [
+         {shutdown_delay, 5000},
+         {shutdown_drain_timeout, 15000},
          {use_stacktrace, false},
          {environment, prod},
          {cowboy_configuration, #{

priv/templates/nova/vm.args.src

@@ -1,6 +1,7 @@
--sname '{{name}}'
-
--setcookie {{name}}_cookie
+## Distributed Erlang is disabled by default.
+## Uncomment the lines below if you need distribution.
+## -sname '{{name}}'
+## -setcookie {{name}}_cookie
 
 +K true
-+A30
++A30