kubeadm: make it also work on CentOS 7

Change-Id: I6fe3c3445844597bfd1b603c1a97687d550f5e87

tools/gate/kubeadm/funcs/common.sh

@@ -14,6 +14,7 @@
 
 function base_install {
   if [ "x$HOST_OS" == "xubuntu" ]; then
+    sudo apt-add-repository --yes ppa:ansible/ansible
     sudo apt-get update -y
     sudo apt-get install -y --no-install-recommends \
       iproute2 \
@@ -21,7 +22,8 @@ function base_install {
       ipcalc \
       nmap \
       lshw \
-      screen
+      screen \
+      ansible
   elif [ "x$HOST_OS" == "xcentos" ]; then
     sudo yum install -y \
       epel-release
@@ -31,14 +33,16 @@ function base_install {
       iptables \
       initscripts \
       nmap \
-      lshw
+      lshw \
+      ansible
   elif [ "x$HOST_OS" == "xfedora" ]; then
     sudo dnf install -y \
       iproute \
       iptables \
       ipcalc \
       nmap \
-      lshw
+      lshw \
+      ansible
   fi
 }
 

tools/gate/kubeadm/playbook/deploy_k8s.yaml

@@ -6,19 +6,16 @@
   gather_facts: false
 
   pre_tasks:
-    - name: install python 2
-      raw: test -e /usr/bin/python || (apt -y update && apt install -y python-minimal)
+    - name: Install packages
+      package: name={{ item }} state=present update_cache=yes
+      with_items:
+        - python
+        - unzip
+        - httpie
 
     - name: Gather facts after python installation
       setup: filter=ansible_*
 
-    - name: Install packages
-      apt: name={{ item }} state=present update_cache=yes
-      with_items:
-        - ansible
-        - unzip
-        - httpie
-
   roles:
     - docker
     - k8s_cli

tools/gate/kubeadm/playbook/roles/docker/tasks/centos.yml

@@ -0,0 +1,44 @@
+---
+- name: Set up docker stable repository on CentOS
+  yum_repository:
+    name: docker-ce-stable
+    description: Docker CE Stable - $basearch
+    baseurl: https://download.docker.com/linux/centos/7/$basearch/stable
+    enabled: yes
+    gpgcheck: yes
+    gpgkey: https://download.docker.com/linux/centos/gpg
+
+- name: Install docker-ce
+  #   yum:
+  #     name: docker-ce-17.03.2.ce
+  #     state: present
+  #     update_cache: yes
+  # NOTE(huntxu): This workaround is required for docker-ce-17.03.2 as its
+  # dependency docker-ce-selinux is marked as obsolete. Hopefully this can
+  # be removed once a newer version of docker can be used.
+  shell: yum install -y --setopt=obsoletes=0 \
+         docker-ce-17.03.2.ce-1.el7.centos \
+         docker-ce-selinux-17.03.2.ce-1.el7.centos
+
+- name: Ensure docker.service.d directory
+  file:
+    path: /etc/systemd/system/docker.service.d
+    recurse: yes
+    state: directory
+
+- name: Change docker cgroup driver
+  copy:
+    content: |
+      [Service]
+      ExecStart=
+      ExecStart=/usr/bin/dockerd --exec-opt native.cgroupdriver=systemd
+    dest: /etc/systemd/system/docker.service.d/10-docker-kubeadm.conf
+    mode: 0644
+    group: root
+    owner: root
+
+- name: Restart docker service
+  systemd:
+    name: docker
+    daemon_reload: yes
+    state: restarted

tools/gate/kubeadm/playbook/roles/docker/tasks/main.yml

@@ -1,21 +1,14 @@
 ---
 - name: Install packages
-  apt: name={{ item }} state=present update_cache=yes
+  package: name={{ item }} state=present update_cache=yes
   with_items:
-    - apt-transport-https
     - ca-certificates
     - curl
 
-- name: Add Docker’s official GPG key
-  apt_key:
-    url: https://download.docker.com/linux/ubuntu/gpg
-    state: present
+- include: ubuntu.yml
+  when:
+    ansible_pkg_mgr == 'apt'
 
-- name: Set up the stable repository
-  apt_repository: repo='deb https://download.docker.com/linux/ubuntu xenial stable' state=present
-
-- name: Install docker-ce
-  apt:
-    name: docker-ce={{ docker_version }}
-    state: present
-    update_cache: yes
+- include: centos.yml
+  when:
+    ansible_pkg_mgr == 'yum'

tools/gate/kubeadm/playbook/roles/docker/tasks/ubuntu.yml

@@ -0,0 +1,22 @@
+---
+- name: Install APT transport-https
+  apt:
+    name: apt-transport-https
+    state: present
+    update_cache: yes
+
+- name: Add Docker’s official GPG key
+  apt_key:
+    url: https://download.docker.com/linux/ubuntu/gpg
+    state: present
+
+- name: Set up the stable repository
+  apt_repository:
+    repo: 'deb https://download.docker.com/linux/ubuntu xenial stable'
+    state: present
+
+- name: Install docker-ce
+  apt:
+    name: docker-ce={{ docker_version }}
+    state: present
+    update_cache: yes

tools/gate/kubeadm/playbook/roles/k8s_cli/tasks/centos.yml

@@ -0,0 +1,12 @@
+---
+- name: Set up Kubernetes repository
+  yum_repository:
+    name: kubernetes
+    description: Kubernetes
+    baseurl: https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64
+    enabled: yes
+    gpgcheck: yes
+    repo_gpgcheck: yes
+    gpgkey:
+      - https://packages.cloud.google.com/yum/doc/yum-key.gpg
+      - https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg

tools/gate/kubeadm/playbook/roles/k8s_cli/tasks/main.yml

@@ -1,14 +1,14 @@
 ---
-- name: Add Kubernetes GPG key
-  apt_key:
-    url: https://packages.cloud.google.com/apt/doc/apt-key.gpg
-    state: present
+- include: ubuntu.yml
+  when:
+    ansible_pkg_mgr == 'apt'
 
-- name: Set up Kubernetes repository
-  apt_repository: repo='deb http://apt.kubernetes.io/ kubernetes-xenial main' state=present
+- include: centos.yml
+  when:
+    ansible_pkg_mgr == 'yum'
 
 - name: Install kube CLIs
-  apt:
+  package:
     name: "{{ item }}"
     state: present
     update_cache: yes
@@ -17,4 +17,10 @@
     - kubeadm
     - kubectl
 
-- import_tasks: install_kube_prompt_tasks.yml
+- name: Start kubelet
+  systemd:
+    name: kubelet
+    state: started
+    daemon_reload: yes
+
+- import_tasks: install_kube_prompt_tasks.yml

tools/gate/kubeadm/playbook/roles/k8s_cli/tasks/ubuntu.yml

@@ -0,0 +1,10 @@
+---
+- name: Add Kubernetes GPG key
+  apt_key:
+    url: https://packages.cloud.google.com/apt/doc/apt-key.gpg
+    state: present
+
+- name: Set up Kubernetes repository
+  apt_repository:
+    repo: 'deb http://apt.kubernetes.io/ kubernetes-xenial main'
+    state: present

tools/gate/kubeadm/setup_gate.sh

@@ -24,7 +24,6 @@ net_resolv_pre_kube
 net_hosts_pre_kube
 
 # Setup the K8s Cluster
-sudo apt-add-repository --yes ppa:ansible/ansible && sudo apt-get update -y -qq && sudo apt-get install ansible -y -qq
 ansible-playbook ${WORK_DIR}/tools/gate/kubeadm/playbook/deploy_k8s.yaml
 
 # waits until kubectl can access the api server