Custom cmd args for Traefik

README.md

@@ -235,6 +235,18 @@ RUN --mount=type=secret,id=GITHUB_TOKEN \
   bundle install
 ```
 
+### Using command arguments for Traefik
+
+You can customize the traefik command line:
+
+```yaml
+traefik:
+  accesslog: true
+  accesslog.format: json
+  metrics.prometheus: true
+  metrics.prometheus.buckets: 0.1,0.3,1.2,5.0
+```
+
 ### Configuring build args for new images
 
 Build arguments that aren't secret can also be configured:

lib/mrsk/commands/traefik.rb

@@ -9,7 +9,8 @@ class Mrsk::Commands::Traefik < Mrsk::Commands::Base
       "-v /var/run/docker.sock:/var/run/docker.sock",
       "traefik",
       "--providers.docker",
-      "--log.level=DEBUG"
+      "--log.level=DEBUG",
+      *cmd_args
   end
 
   def start
@@ -44,4 +45,9 @@ class Mrsk::Commands::Traefik < Mrsk::Commands::Base
   def remove_image
     docker :image, :prune, "-a", "-f", "--filter", "label=org.opencontainers.image.title=Traefik"
   end
+
+  private
+    def cmd_args
+      (config.raw_config.dig(:traefik, "args") || { }).collect { |(key, value)| [ "--#{key}", value ] }.flatten
+    end
 end

test/commands/traefik_test.rb

@@ -0,0 +1,23 @@
+require "test_helper"
+require "mrsk/configuration"
+require "mrsk/commands/traefik"
+
+class CommandsTraefikTest < ActiveSupport::TestCase
+  setup do
+    @config = {
+      service: "app", image: "dhh/app", registry: { "username" => "dhh", "password" => "secret" }, servers: [ "1.1.1.1" ],
+      traefik: { "args" => { "accesslog.format" => "json", "metrics.prometheus.buckets" => "0.1,0.3,1.2,5.0" } }
+    }
+  end
+
+  test "run" do
+    assert_equal \
+      [:docker, :run, "--name traefik", "-d", "--restart unless-stopped", "-p 80:80", "-v /var/run/docker.sock:/var/run/docker.sock", "traefik", "--providers.docker", "--accesslog.format", "json", "--metrics.prometheus.buckets", "0.1,0.3,1.2,5.0"],
+      new_command.run
+  end
+
+  private
+    def new_command
+      Mrsk::Commands::Traefik.new(Mrsk::Configuration.new(@config, version: "123"))
+    end
+end