Switch to using Docker registry containers for efficiency.

.travis.yml

@@ -2,20 +2,24 @@
 sudo: required
 
 env:
-  - distribution: centos
-    version: 6
+  - repository: geerlingguy/docker-centos7-ansible
+    version: latest
+    init: /usr/lib/systemd/systemd
+    run_opts: "--privileged --volume=/sys/fs/cgroup:/sys/fs/cgroup:ro"
+  - repository: geerlingguy/docker-centos6-ansible
+    version: latest
     init: /sbin/init
     run_opts: ""
-  - distribution: centos
-    version: 7
-    init: /usr/lib/systemd/systemd
+  - repository: geerlingguy/docker-ubuntu1604-ansible
+    version: latest
+    init: /lib/systemd/systemd
     run_opts: "--privileged --volume=/sys/fs/cgroup:/sys/fs/cgroup:ro"
-  - distribution: ubuntu
-    version: 14.04
+  - repository: geerlingguy/docker-ubuntu1404-ansible
+    version: latest
     init: /sbin/init
     run_opts: ""
-  - distribution: ubuntu
-    version: 12.04
+  - repository: geerlingguy/docker-ubuntu1204-ansible
+    version: latest
     init: /sbin/init
     run_opts: ""
 
@@ -23,15 +27,13 @@ services:
   - docker
 
 before_install:
-  # Pull container
-  - 'sudo docker pull ${distribution}:${version}'
-  # Customize container
-  - 'sudo docker build --rm=true --file=tests/Dockerfile.${distribution}-${version} --tag=${distribution}-${version}:ansible tests'
+  # Pull container.
+  - 'sudo docker pull ${repository}:${version}'
 
 script:
   - container_id=$(mktemp)
-  # Run container in detached state
-  - 'sudo docker run --detach --volume="${PWD}":/etc/ansible/roles/role_under_test:ro ${run_opts} ${distribution}-${version}:ansible "${init}" > "${container_id}"'
+  # Run container in detached state.
+  - 'sudo docker run --detach --volume="${PWD}":/etc/ansible/roles/role_under_test:ro ${run_opts} ${repository}:${version} "${init}" > "${container_id}"'
 
   # Ansible syntax check.
   - 'sudo docker exec --tty "$(cat ${container_id})" env TERM=xterm ansible-playbook /etc/ansible/roles/role_under_test/tests/test.yml --syntax-check'
@@ -48,7 +50,7 @@ script:
     && (echo 'Idempotence test: pass' && exit 0)
     || (echo 'Idempotence test: fail' && exit 1)
 
-  # Clean up
+  # Clean up.
   - 'sudo docker stop "$(cat ${container_id})"'
 
 notifications:

tests/Dockerfile.centos-6

@@ -1,15 +0,0 @@
-FROM centos:6
-
-# Install Ansible
-RUN yum -y update; yum clean all;
-RUN yum -y install epel-release
-RUN yum -y install git ansible sudo
-RUN yum clean all
-
-# Disable requiretty
-RUN sed -i -e 's/^\(Defaults\s*requiretty\)/#--- \1/'  /etc/sudoers
-
-# Install Ansible inventory file
-RUN echo -e '[local]\nlocalhost ansible_connection=local' > /etc/ansible/hosts
-
-CMD ["/usr/sbin/init"]

tests/Dockerfile.centos-7

@@ -1,27 +0,0 @@
-FROM centos:7
-
-# Install systemd -- See https://hub.docker.com/_/centos/
-RUN yum -y swap -- remove fakesystemd -- install systemd systemd-libs
-RUN yum -y update; yum clean all; \
-(cd /lib/systemd/system/sysinit.target.wants/; for i in *; do [ $i == systemd-tmpfiles-setup.service ] || rm -f $i; done); \
-rm -f /lib/systemd/system/multi-user.target.wants/*; \
-rm -f /etc/systemd/system/*.wants/*; \
-rm -f /lib/systemd/system/local-fs.target.wants/*; \
-rm -f /lib/systemd/system/sockets.target.wants/*udev*; \
-rm -f /lib/systemd/system/sockets.target.wants/*initctl*; \
-rm -f /lib/systemd/system/basic.target.wants/*; \
-rm -f /lib/systemd/system/anaconda.target.wants/*;
-
-# Install Ansible
-RUN yum -y install epel-release
-RUN yum -y install git ansible sudo
-RUN yum clean all
-
-# Disable requiretty
-RUN sed -i -e 's/^\(Defaults\s*requiretty\)/#--- \1/'  /etc/sudoers
-
-# Install Ansible inventory file
-RUN echo -e '[local]\nlocalhost ansible_connection=local' > /etc/ansible/hosts
-
-VOLUME ["/sys/fs/cgroup"]
-CMD ["/usr/sbin/init"]

tests/Dockerfile.ubuntu-12.04

@@ -1,11 +0,0 @@
-FROM ubuntu:12.04
-RUN apt-get update
-
-# Install Ansible
-RUN apt-get install -y software-properties-common python-software-properties git
-RUN apt-add-repository -y ppa:ansible/ansible
-RUN apt-get update
-RUN apt-get install -y ansible
-
-# Install Ansible inventory file
-RUN echo "[local]\nlocalhost ansible_connection=local" > /etc/ansible/hosts

tests/Dockerfile.ubuntu-14.04

@@ -1,11 +0,0 @@
-FROM ubuntu:14.04
-RUN apt-get update
-
-# Install Ansible
-RUN apt-get install -y software-properties-common git
-RUN apt-add-repository -y ppa:ansible/ansible
-RUN apt-get update
-RUN apt-get install -y ansible
-
-# Install Ansible inventory file
-RUN echo "[local]\nlocalhost ansible_connection=local" > /etc/ansible/hosts