Merge pull request #323 from basecamp/prefix-docker-host-with-real-host

Prefix container hostname with the underlying one

lib/mrsk/cli/app.rb

@@ -29,7 +29,7 @@ class Mrsk::Cli::App < Mrsk::Cli::Base
               execute *auditor.record("Booted app version #{version}"), verbosity: :debug
 
               old_version = capture_with_info(*app.current_running_version, raise_on_non_zero_exit: false).strip
-              execute *app.start_or_run
+              execute *app.start_or_run(hostname: "#{host}-#{SecureRandom.hex(6)}")
 
               Mrsk::Utils::HealthcheckPoller.wait_for_healthy(pause_after_ready: true) { capture_with_info(*app.status(version: version)) }
 

lib/mrsk/commands/app.rb

@@ -8,17 +8,18 @@ class Mrsk::Commands::App < Mrsk::Commands::Base
     @role = role
   end
 
-  def start_or_run
-    combine start, run, by: "||"
+  def start_or_run(hostname: nil)
+    combine start, run(hostname: hostname), by: "||"
   end
 
-  def run
+  def run(hostname: nil)
     role = config.role(self.role)
 
     docker :run,
       "--detach",
       "--restart unless-stopped",
       "--name", container_name,
+      *(["--hostname", hostname] if hostname),
       "-e", "MRSK_CONTAINER_NAME=\"#{container_name}\"",
       *role.env_args,
       *role.health_check_args,