Add experimental installation from docker

This is our first attempt at running nodepool from docker, consider it
experimental.  The idea here, is you now have the option of using the
official docker images from https://hub.docker.com/u/zuul for nodepool.

Users themself will be required to manage / configure docker, this role
only installs / configures / starts nodepool.

Change-Id: I2f3aa301e626a7b09ff129a21a188cee06e31f18
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

.zuul.yaml

@@ -44,12 +44,23 @@
     parent: ansible-role-nodepool-src
     nodeset: ubuntu-bionic
 
+# Testing for nodepool_install_method: docker
+- job:
+    name: ansible-role-nodepool-docker
+    parent: ansible-role-nodepool-base
+    nodeset: ubuntu-bionic
+    vars:
+      nodepool_install_method: docker
+      nodepool_file_nodepool_builder_service_src: etc/systemd/system/nodepool-builder.service.j2
+      nodepool_file_nodepool_launcher_service_src: etc/systemd/system/nodepool-launcher.service.j2
+
 - project:
     templates:
       - windmill-jobs-fedora-latest
       - windmill-jobs-bionic
     check:
       jobs:
+        - ansible-role-nodepool-docker
         - ansible-role-nodepool-fedora-latest
         - ansible-role-nodepool-ubuntu-bionic
         - ansible-role-nodepool-src-fedora-latest
@@ -58,6 +69,7 @@
         - windmill-tox-molecule
     gate:
       jobs:
+        - ansible-role-nodepool-docker
         - ansible-role-nodepool-fedora-latest
         - ansible-role-nodepool-ubuntu-bionic
         - ansible-role-nodepool-src-fedora-latest

README.rst

@@ -21,6 +21,12 @@ Requirements
 ------------
 
 * pip3 to be installed if using nodepool_install_method: (git|pip)
+* docker to be installed if using nodepool_install_method: docker
+  *NOTE*
+  Docker support should be consider experimental. You will need to create
+  systemd service files manually. There are too many possible settings
+  for docker, which make is almost impossible to support via Ansible.
+
 
 Packages
 ~~~~~~~~

bindep.txt

@@ -3,3 +3,4 @@
 
 docker.io [test platform:dpkg]
 docker [test platform:fedora]
+python-docker [test platform:dpkg]

defaults/main.yaml

@@ -69,6 +69,10 @@ nodepool_pip_name: nodepool
 # nodepool_pip_virtualenv_python:
 # nodepool_pip_virtualenv:
 
+nodepool_docker_name:
+  - zuul/nodepool-builder
+  - zuul/nodepool-launcher
+
 # tasks/service.yaml
 nodepool_file_nodepool_builder_service_manage: true
 nodepool_file_nodepool_builder_service_group: root

requirements.txt

@@ -1 +1,2 @@
 ansible>=2.4.0
+docker

tasks/install/docker.yaml

@@ -0,0 +1,19 @@
+# Copyright 2018 Red Hat, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+---
+- name: Install nodepool using docker
+  become: true
+  docker_image:
+    name: "{{ item }}"
+  with_items: "{{ nodepool_docker_name }}"

test-requirements.txt

@@ -1,3 +1,2 @@
 ara
-docker
 molecule

tests/playbooks/pre.yaml

@@ -12,3 +12,13 @@
         dest: /etc/pip.conf
         regexp: ^extra-index-url
         state: absent
+
+    - name: Execute bindep role
+      include_role:
+        name: bindep
+      vars:
+        bindep_profile: ansible test
+
+    - name: Execute test-setup role
+      include_role:
+        name: test-setup

tests/playbooks/templates/etc/systemd/system/nodepool-builder.service.j2

@@ -0,0 +1,14 @@
+[Unit]
+Description=Nodepool Builder Service
+After=docker.service
+Requires=docker.service
+
+[Service]
+Type=simple
+# Options to pass to nodepool-builder.
+Environment="ARGS=-l /etc/nodepool/builder-logging.conf"
+ExecStart=/usr/bin/docker run --rm --name nodepool-builder -u 1001:1001 -v /var/lib/nodepool:/var/lib/nodepool -v /etc/nodepool:/etc/nodepool -v /opt/nodepool:/opt/nodepool -v /var/log/nodepool:/var/log/nodepool -h nodepool-builder zuul/nodepool-builder nodepool-builder -d $ARGS
+ExecStop=/usr/bin/docker stop nodepool-builder
+
+[Install]
+WantedBy=multi-user.target

tests/playbooks/templates/etc/systemd/system/nodepool-launcher.service.j2

@@ -0,0 +1,14 @@
+[Unit]
+Description=Nodepool Launcher Service
+After=docker.service
+Requires=docker.service
+
+[Service]
+Type=simple
+# Options to pass to nodepool-launcher.
+Environment="ARGS=-l /etc/nodepool/launcher-logging.conf --no-webapp"
+ExecStart=/usr/bin/docker run --rm --name nodepool-launcher -u 1001:1001 -v /var/lib/nodepool:/var/lib/nodepool -v /etc/nodepool:/etc/nodepool -v /opt/nodepool:/opt/nodepool -v /var/log/nodepool:/var/log/nodepool -h nodepool-launcher zuul/nodepool-launcher nodepool-launcher -d $ARGS
+ExecStop=/usr/bin/docker stop nodepool-launcher
+
+[Install]
+WantedBy=multi-user.target