diff --git a/.dockerignore b/.dockerignore
index f827cb2849..4de9b1d477 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -2,3 +2,5 @@ public/system
 publiclab.org
 log
 .git
+*.log
+tmp
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 8507240ab7..df11e34fee 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -15,12 +15,20 @@ before_script:
   - apk add --no-cache py-pip && pip install docker-compose
   - docker-compose build
   - docker-compose up -d
-  - docker-compose exec -T web bundle install
   - docker-compose exec -T web rake db:setup
   - docker-compose exec -T web rake db:migrate
   - docker-compose exec -T web bower install --allow-root
 
 job:
   script:
-    - docker-compose exec -T web rake test:all
-    - docker-compose exec -T web rails test -d
+    - docker-compose exec -T web strace -s 512 -o log/trace1.log rake test:all
+    - tail -n 3000 log/trace1.log > log/trace1.tail.log
+    - docker-compose exec -T web strace -s 512 -o log/trace2.log rails test -d
+    - tail -n 3000 log/trace2.log > log/trace2.tail.log
+  artifacts:
+    when: on_failure
+    paths:
+    - log/trace1.log
+    - log/trace1.tail.log
+    - log/trace2.log
+    - log/trace2.tail.log
diff --git a/.travis.yml b/.travis.yml
index e367dfb466..ba0a0c7683 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,9 +6,6 @@ services:
 env:
   - COMPOSE_FILE=./containers/docker-compose-testing.yml
 
-before_script:
-  - bundle install
-
 before_install:
   - echo -e "repo_token:\n  $COVERALLS_REPO_TOKEN" >> ./.coveralls.yml
 
diff --git a/Dockerfile b/Dockerfile
index 5969a5bcc0..a333b324a3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 # Dockerfile # Plots2
 # https://github.com/publiclab/plots2
 
-FROM ruby:2.4.1-stretch
+FROM ruby:2.4.4-stretch
 
 LABEL description="This image deploys Plots2."
 
@@ -18,7 +18,7 @@ ENV PHANTOMJS_VERSION 2.1.1
 
 # Install dependencies
 RUN curl -sL https://deb.nodesource.com/setup_8.x | bash -
-RUN apt-get update -qq && apt-get install -y build-essential bundler libmariadbclient-dev ruby-rmagick libfreeimage3 wget curl procps cron make nodejs
+RUN apt-get update -qq && apt-get install -y build-essential bundler libmariadbclient-dev ruby-rmagick libfreeimage3 wget curl procps cron make nodejs strace
 RUN wget https://github.com/Medium/phantomjs/releases/download/v$PHANTOMJS_VERSION/phantomjs-$PHANTOMJS_VERSION-linux-x86_64.tar.bz2 -O /tmp/phantomjs-$PHANTOMJS_VERSION-linux-x86_64.tar.bz2; tar -xvf /tmp/phantomjs-$PHANTOMJS_VERSION-linux-x86_64.tar.bz2 -C /opt ; cp /opt/phantomjs-$PHANTOMJS_VERSION-linux-x86_64/bin/* /usr/local/bin/
 RUN npm install -g bower
 
diff --git a/Gemfile b/Gemfile
index b7e7648569..bc913763af 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,5 @@
 source 'https://rubygems.org'
-ruby '2.4.1'
+ruby '2.4.4'
 
 git_source(:github) do |repo_name|
   repo_name = "#{repo_name}/#{repo_name}" unless repo_name.include?("/")
diff --git a/Makefile b/Makefile
index 2ea428dfdc..3a0d724f81 100644
--- a/Makefile
+++ b/Makefile
@@ -36,10 +36,8 @@ deploy-container:
 
 test-container:
 	docker-compose up -d
-	docker-compose exec -T web bundle install
 	docker-compose exec -T web rake db:setup
 	docker-compose exec -T web rake db:migrate
-	docker-compose exec -T web bower install --allow-root
 	docker-compose exec -T web rake test:all
 	docker-compose exec -T web rails test -d
 	docker-compose down
diff --git a/containers/docker-compose-production.yml b/containers/docker-compose-production.yml
index 43059b593b..4185519efb 100644
--- a/containers/docker-compose-production.yml
+++ b/containers/docker-compose-production.yml
@@ -47,8 +47,6 @@ services:
     restart: on-failure:5
   redis:
     image: redis:latest
-    ports:
-      - '127.0.0.1:6379:6379'
     command: redis-server
   sidekiq:
     build: ..
diff --git a/containers/docker-compose-stable.yml b/containers/docker-compose-stable.yml
index c0211275b6..30316e9b38 100644
--- a/containers/docker-compose-stable.yml
+++ b/containers/docker-compose-stable.yml
@@ -47,8 +47,6 @@ services:
     restart: on-failure:5
   redis:
     image: redis:latest
-    ports:
-      - '127.0.0.1:6379:6379'
     command: redis-server
   sidekiq:
     build: ..
diff --git a/containers/docker-compose-testing.yml b/containers/docker-compose-testing.yml
index ad1d69665b..8f0b947fb3 100644
--- a/containers/docker-compose-testing.yml
+++ b/containers/docker-compose-testing.yml
@@ -18,12 +18,12 @@ services:
       # if you want to re-import simply put away ../../mysql/*
   redis:
     image: redis:latest
-    ports:
-      - '6379:6379'
     command: redis-server
   web:
     build: ..
-    command: /bin/bash -c "sleep 5 && passenger start -p 4000"
+    cap_add:
+      - SYS_PTRACE
+    command: /bin/bash -c "sleep 5 && /usr/local/bundle/bin/passenger start --max-pool-size 9 --min-instances 9 -p 4000"
     environment:
       - RAILS_ENV=${RAILS_ENV}
       - SECRET_KEY_BASE=${SECRET_KEY_BASE}
@@ -32,8 +32,6 @@ services:
       - redis
     volumes:
       - ..:/app
-    ports:
-      - "127.0.0.1:4000:4000"
     restart: unless-stopped
   sidekiq:
     build: ..
diff --git a/containers/docker-compose-unstable.yml b/containers/docker-compose-unstable.yml
index 57cd5fd4f6..618a3d8231 100644
--- a/containers/docker-compose-unstable.yml
+++ b/containers/docker-compose-unstable.yml
@@ -47,8 +47,6 @@ services:
     restart: on-failure:5
   redis:
     image: redis:latest
-    ports:
-      - '127.0.0.1:6379:6379'
     command: redis-server
   sidekiq:
     build: ..