Handle polling without the healthcheck config

lib/kamal/cli/app.rb

@@ -4,7 +4,7 @@ class Kamal::Cli::App < Kamal::Cli::Base
     with_lock do
       say "Get most recent version available as an image...", :magenta unless options[:version]
       using_version(version_or_latest) do |version|
-        say "Start container with version #{version} using a #{KAMAL.config.readiness_delay}s readiness delay (or reboot if already running)...", :magenta
+        say "Start container with version #{version} (or reboot if already running)...", :magenta
 
         # Assets are prepared in a separate step to ensure they are on all hosts before booting
         on(KAMAL.hosts) do

lib/kamal/cli/app/boot.rb

@@ -58,6 +58,9 @@ class Kamal::Cli::App::Boot
       else
         Kamal::Cli::Healthcheck::Poller.wait_for_healthy(pause_after_ready: true) { capture_with_info(*app.status(version: version)) }
       end
+    rescue => e
+      error "Failed to boot #{role} on #{host}"
+      raise e
     end
 
     def stop_new_version

lib/kamal/cli/healthcheck/poller.rb

@@ -1,22 +1,30 @@
 module Kamal::Cli::Healthcheck::Poller
   extend self
 
-  def wait_for_healthy(pause_after_ready: false, &block)
+  def wait_for_healthy(role, &block)
     attempt = 1
-    max_attempts = 7
+    timeout_at = Time.now + KAMAL.config.readiness_timeout
+    readiness_delay = KAMAL.config.readiness_delay
 
     begin
-      case status = block.call
-      when "healthy"
-      when "running" # No health check configured
-        sleep KAMAL.config.readiness_delay if pause_after_ready
-      else
-        raise Kamal::Cli::Healthcheck::Error, "container not ready (#{status})"
+      status = block.call
+
+      if status == "running"
+        # Wait for the readiness delay and confirm it is still running
+        if readiness_delay > 0
+          info "Container is running, waiting for readiness delay of #{readiness_delay} seconds"
+          sleep readiness_delay
+          status = block.call
+        end
+      end
+
+      unless %w[ running healthy ].include?(status)
+        raise Kamal::Cli::Healthcheck::Error, "container not ready after #{KAMAL.config.readiness_timeout} seconds (#{status})"
       end
     rescue Kamal::Cli::Healthcheck::Error => e
-      if attempt <= max_attempts
-        info "#{e.message}, retrying in #{attempt}s (attempt #{attempt}/#{max_attempts})..."
-        sleep attempt
+      time_left = timeout_at - Time.now
+      if time_left > 0
+        sleep [ attempt, time_left ].min
         attempt += 1
         retry
       else

lib/kamal/configuration.rb

@@ -189,6 +189,10 @@ class Kamal::Configuration
     raw_config.readiness_delay || 7
   end
 
+  def readiness_timeout
+    raw_config.readiness_timeout || 30
+  end
+
 
   def run_directory
     ".kamal"

lib/kamal/configuration/docs/configuration.yml

@@ -111,9 +111,15 @@ minimum_version: 1.3.0
 # Readiness delay
 #
 # Seconds to wait for a container to boot after is running, default 7
-# This only applies to containers that do not specify a healthcheck
+# This only applies to containers that do not run a proxy or specify a healthcheck
 readiness_delay: 4
 
+# Readiness timeout
+#
+# How long to wait for a container to become ready, default 30
+# This only applies to containers that do not run a proxy
+readiness_timeout: 4
+
 # Run directory
 #
 # Directory to store kamal runtime files in on the host, default `.kamal`