Replace Unicorn with Puma

Dockerfile

@@ -6,4 +6,4 @@ ADD Gemfile /app/Gemfile
 ADD Gemfile.lock /app/Gemfile.lock
 RUN bundle install --jobs=8 --without development test
 ADD . /app
-CMD ["unicorn", "-c", "./config/unicorn.rb"]
+CMD ["puma", "-C", "config/puma.rb"]

Gemfile

@@ -6,12 +6,12 @@ ruby '2.5.1'
 
 gem 'oj'
 gem 'ox'
+gem 'puma'
 gem 'rack-cors'
 gem 'rake'
 gem 'rufus-scheduler'
 gem 'sequel_pg'
 gem 'sinatra'
-gem 'unicorn'
 
 group :development do
   gem 'guard'

Gemfile.lock

@@ -39,7 +39,6 @@ GEM
     hashdiff (0.3.7)
     http_parser.rb (0.6.0)
     jaro_winkler (1.4.0)
-    kgio (2.11.2)
     listen (3.1.5)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
@@ -66,6 +65,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     public_suffix (3.0.2)
+    puma (3.11.4)
     raabro (1.1.5)
     rack (2.0.5)
     rack-cors (1.0.2)
@@ -76,7 +76,6 @@ GEM
     rack-test (1.0.0)
       rack (>= 1.0, < 3)
     rainbow (3.0.0)
-    raindrops (0.19.0)
     rake (12.3.1)
     rb-fsevent (0.10.3)
     rb-inotify (0.9.10)
@@ -112,9 +111,6 @@ GEM
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
     unicode-display_width (1.4.0)
-    unicorn (5.4.0)
-      kgio (~> 2.6)
-      raindrops (~> 0.7)
     vcr (4.0.0)
     webmock (3.4.2)
       addressable (>= 2.3.6)
@@ -133,6 +129,7 @@ DEPENDENCIES
   oj
   ox
   pry
+  puma
   rack-cors
   rack-livereload
   rack-test
@@ -142,7 +139,6 @@ DEPENDENCIES
   sequel_pg
   shotgun
   sinatra
-  unicorn
   vcr
   webmock
 

config/puma.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+workers Integer(ENV['WEB_CONCURRENCY'] || 2)
+threads_count = Integer(ENV['MAX_THREADS'] || 5)
+threads threads_count, threads_count
+
+preload_app!
+
+rackup      DefaultRackup
+port        ENV['PORT']    || 3000
+environment ENV['APP_ENV'] || 'developments'

config/unicorn.rb

@@ -1,11 +0,0 @@
-# frozen_string_literal: true
-
-worker_process_count = (ENV['WORKER_PROCESSES'] || 4).to_i
-
-preload_app true
-worker_processes worker_process_count
-timeout 10
-
-before_fork do |_, _|
-  Sequel::DATABASES.each(&:disconnect)
-end

docker-compose.override.yml

@@ -6,7 +6,7 @@ services:
       APP_ENV: development
       VIRTUAL_HOST: localhost
     ports:
-      - "8080:8080"
+      - "3000:3000"
   scheduler:
     build: .
     environment:

docker-compose.yml

@@ -5,12 +5,12 @@ services:
     volumes:
       - data:/var/lib/postgresql/data
   web:
-    command: unicorn -c config/unicorn.rb
+    command: puma -C config/puma.rb
     entrypoint: bin/wait-for-it.sh db:5432 -s --
     environment:
       DATABASE_URL: postgres://postgres@db/postgres
     expose:
-      - '8080'
+      - '3000'
     links:
       - db
   scheduler: