install-kubernetes: add support for cri-o runtime

This adds optional support for using the cri-o rather than the
(still default) docker runtime.

Change-Id: I0f7cbb758a21cb022ceac24654183138bebf83bf

roles/install-kubernetes/README.rst

@@ -17,3 +17,9 @@ An ansible role to install kubernetes.
 
    List of dns resolvers to configure in k8s. Use this to override the
    resolvers that are found by default.
+
+.. zuul:rolevar:: kubernetes_runtime
+   :default: docker
+
+   Which kubernetes runtime to use; values are ``docker`` or
+   ``cri-o``.

roles/install-kubernetes/defaults/main.yaml

@@ -1,3 +1,4 @@
 install_kubernetes_with_cluster: True
 minikube_version: latest
 minikube_dns_resolvers: []
+kubernetes_runtime: docker

roles/install-kubernetes/tasks/crio.yaml

@@ -0,0 +1,28 @@
+- name: Add project atomic PPA
+  apt_repository:
+    repo: ppa:projectatomic/ppa
+  become: true
+- name: Install packages
+  package:
+    name:
+      - cri-o-1.15
+      - containernetworking-plugins
+      - podman
+      - cri-tools
+    state: present
+  become: true
+- name: Fix conmon symlink
+  file:
+    src: /usr/bin/conmon
+    dest: /usr/libexec/crio/conmon
+    owner: root
+    group: root
+    state: link
+  become: true
+- name: Set crio cgroup driver
+  ini_file:
+    path: /etc/crio/crio.conf
+    section: crio.runtime
+    option: cgroup_manager
+    value: '"cgroupfs"'
+  become: true

roles/install-kubernetes/tasks/minikube.yaml

@@ -14,6 +14,10 @@
   include_role:
     name: install-docker
 
+- name: Install crio
+  when: kubernetes_runtime == 'cri-o'
+  include_tasks: crio.yaml
+
 - name: Create .kube directory
   file:
     path: "{{ ansible_user_dir }}/.kube"
@@ -50,7 +54,7 @@
 
 - name: Start Minikube
   become: yes
-  command: "/tmp/minikube --vm-driver=none start {{ minikube_args }}"
+  command: "/tmp/minikube --vm-driver=none --container-runtime={{ kubernetes_runtime }} {{ minikube_args }} start"
   environment:
     MINIKUBE_WANTUPDATENOTIFICATION: false
     MINIKUBE_WANTREPORTERRORPROMPT: false

test-playbooks/install-kubernetes/crio.yaml

@@ -0,0 +1,9 @@
+- hosts: all
+  name: Install kubernetes with minikube
+  roles:
+    - role: install-kubernetes
+      vars:
+        minikube_dns_resolvers:
+          - '1.1.1.1'
+          - '8.8.8.8'
+        kubernetes_runtime: cri-o

test-playbooks/install-kubernetes/docker.yaml

@@ -1,4 +1,4 @@
-- hosts: primary
+- hosts: all
   name: Install kubernetes with minikube
   roles:
     - role: install-kubernetes

test-playbooks/install-kubernetes/post.yaml

@@ -0,0 +1,7 @@
+- hosts: all
+  tasks:
+    - name: Get minikube logs
+      become: true
+      shell: "/tmp/minikube logs > {{ ansible_user_dir }}/zuul-output/logs/minikube.txt"
+      environment:
+        MINIKUBE_HOME: "{{ ansible_user_dir }}"

zuul-tests.d/container-roles-jobs.yaml

@@ -26,9 +26,9 @@
           label: ubuntu-bionic
 
 - job:
-    name: zuul-jobs-test-install-kubernetes
+    name: zuul-jobs-test-install-kubernetes-docker
     description: |
-      Test the install-kubernetes role
+      Test the install-kubernetes role with docker
 
       This job tests changes to the install-kubernetes roles.  It
       is not meant to be used directly but rather run on changes to
@@ -37,11 +37,23 @@
       - roles/install-docker/.*
       - roles/install-kubernetes/.*
       - test-playbooks/install-kubernetes.yaml
-    run: test-playbooks/install-kubernetes.yaml
-    nodeset:
-      nodes:
-        - name: primary
-          label: ubuntu-bionic
+    run: test-playbooks/install-kubernetes/docker.yaml
+    post-run: test-playbooks/install-kubernetes/post.yaml
+
+- job:
+    name: zuul-jobs-test-install-kubernetes-crio
+    description: |
+      Test the install-kubernetes role with crio-o
+
+      This job tests changes to the install-kubernetes roles.  It
+      is not meant to be used directly but rather run on changes to
+      roles in the zuul-jobs repo.
+    files:
+      - roles/install-docker/.*
+      - roles/install-kubernetes/.*
+      - test-playbooks/install-kubernetes.yaml
+    run: test-playbooks/install-kubernetes/crio.yaml
+    post-run: test-playbooks/install-kubernetes/post.yaml
 
 # List all the jobs in this file.
 
@@ -49,6 +61,7 @@
     check:
       jobs: &id001
         - zuul-jobs-test-registry
-        - zuul-jobs-test-install-kubernetes
+        - zuul-jobs-test-install-kubernetes-docker
+        - zuul-jobs-test-install-kubernetes-crio
     gate:
       jobs: *id001