Add ansible scripts for raspberry pi based kubernetes edge cluster

JIRA: CLOVER-71

This issue falls under the "Edge Cloud-Native Cluster" intern project and is a part of both Clover and Edge cloud projects. The detailed description of the project and the instructions for using the scripts are documented in the README.

Change-Id: I4fdb98f17ae0c53f918376ad6fb90be8ff0b0a71
Signed-off-by: adarsh1001 <adarshpalsingh1996@gmail.com>

4 files changed, 232 insertions, 0 deletions

diff --git a/edge/sample/roles/clusterForm_common/tasks/main.yml b/edge/sample/roles/clusterForm_common/tasks/main.yml
new file mode 100644
index 0000000..a690d28
--- /dev/null
+++ b/edge/sample/roles/clusterForm_common/tasks/main.yml
@@ -0,0 +1,127 @@
+# Copyright (c) Authors of Clover
+#
+# All rights reserved. This program and the accompanying materials
+# are made available under the terms of the Apache License, Version 2.0
+# which accompanies this distribution, and is available at
+# http://www.apache.org/licenses/LICENSE-2.0
+
+- name: Checking dependencies for Docker
+  shell: docker --version
+  register: doc_ver
+  ignore_errors: true
+  failed_when: false
+
+- name: Removing unsupported version of Docker (if any)
+  apt:
+    name: "{{ item }}"
+    state: absent
+  with_items:
+    - 'docker'
+    - 'docker-engine'
+    - 'docker-ce'
+    - 'docker.io'
+  when: doc_ver.stdout.find('18.04.0-ce') == -1
+
+- name: Adding GPG key for Docker
+  apt_key:
+    url: https://download.docker.com/linux/debian/gpg
+    state: present
+  when: doc_ver.stdout.find('18.04.0-ce') == -1
+
+- name: Updating sources.list.d directory
+  shell: echo "deb [arch=armhf] https://download.docker.com/linux/$(. /etc/os-release; echo "$ID") $(lsb_release -cs) edge" | \ tee /etc/apt/sources.list.d/docker.list
+  when: doc_ver.stdout.find('18.04.0-ce') == -1
+
+- name: Installing Docker 18.04.0
+  apt:
+    name: docker-ce=18.04.0~ce~3-0~raspbian
+    update_cache: yes
+  when: doc_ver.stdout.find('18.04.0-ce') == -1
+
+- name: Adding user 'pi' to the 'docker' group
+  shell: usermod pi -aG docker
+  when: doc_ver.stdout.find('18.04.0-ce') == -1
+
+- name: Removing docker from apt sources to prevent upgrade
+  file:
+    path: /etc/apt/sources.list.d/docker.list
+    state: absent
+
+- name: Turning off swap
+  shell: dphys-swapfile swapoff && dphys-swapfile uninstall && update-rc.d dphys-swapfile remove
+
+- name: Checking cgroup dependencies
+  shell: cat /boot/cmdline.txt
+  register: boot
+
+- name: Enabling cpuset cgroup
+  shell: sed -i 's/$/ cgroup_enable=cpuset/' /boot/cmdline.txt
+  args:
+    warn: false
+  when: boot.stdout.find('cgroup_enable=cpuset') == -1
+
+- name: Enabling memory cgroup (1/2)
+  shell: sed -i 's/$/ cgroup_memory=1/' /boot/cmdline.txt
+  args:
+    warn: false
+  when: boot.stdout.find('cgroup_memory=1') == -1
+
+- name: Enabling memory cgroup (2/2)
+  shell: sed -i 's/$/ cgroup_enable=memory/' /boot/cmdline.txt
+  args:
+    warn: false
+  when: boot.stdout.find('cgroup_enable=memory') == -1
+
+- name: Rebooting
+  shell: sleep 2 && reboot
+  async: 1
+  poll: 0
+  ignore_errors: true
+  when: boot.stdout.find('cgroup_enable=cpuset') == -1 or boot.stdout.find('cgroup_memory=1') == -1 or boot.stdout.find('cgroup_enable=memory') == -1
+
+- name: Waiting for host(s) to come online
+  wait_for_connection:
+    delay: 30
+  when: boot.stdout.find('cgroup_enable=cpuset') == -1 or boot.stdout.find('cgroup_memory=1') == -1 or boot.stdout.find('cgroup_enable=memory') == -1
+
+- name: Checking dependencies for Kubernetes
+  shell: kubeadm version
+  register: kube_ver
+  ignore_errors: true
+  failed_when: false
+
+- name: Removing unsupported version of Kubernetes (if any)
+  apt:
+    name: "{{ item }}"
+    state: absent
+    autoremove: yes
+  with_items:
+    - 'kubeadm'
+    - 'kubectl'
+    - 'kubelet'
+  when: kube_ver.stdout.find('v1.10.2') == -1
+
+- name: Adding GPG key for kubernetes
+  apt_key:
+    url: https://packages.cloud.google.com/apt/doc/apt-key.gpg
+    state: present
+  when: kube_ver.stdout.find('v1.10.2') == -1
+
+- name: Updating sources.list.d directory
+  shell: echo "deb http://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list
+  when: kube_ver.stdout.find('v1.10.2') == -1
+
+- name: Installing kubeadm, kubectl and kubelet version 1.10.2-00
+  apt:
+    name: "{{ item }}"
+    update_cache: true
+  with_items:
+    - 'kubeadm=1.10.2-00'
+    - 'kubectl=1.10.2-00'
+    - 'kubelet=1.10.2-00'
+  when: kube_ver.stdout.find('v1.10.2') == -1
+
+- name: Removing kubernetes from apt sources to prevent upgrade
+  file:
+    path: /etc/apt/sources.list.d/kubernetes.list
+    state: absent
diff --git a/edge/sample/roles/clusterForm_master/tasks/main.yml b/edge/sample/roles/clusterForm_master/tasks/main.yml
new file mode 100644
index 0000000..9137d7f
--- /dev/null
+++ b/edge/sample/roles/clusterForm_master/tasks/main.yml
@@ -0,0 +1,72 @@
+# Copyright (c) Authors of Clover
+#
+# All rights reserved. This program and the accompanying materials
+# are made available under the terms of the Apache License, Version 2.0
+# which accompanies this distribution, and is available at
+# http://www.apache.org/licenses/LICENSE-2.0
+
+- name: Resetting kubeadm on master
+  shell: kubeadm reset
+
+- name: Removing KUBELET_NETWORK_ARGS flag in the kubadm config file
+  shell: sed -i '/KUBELET_NETWORK_ARGS=/d' /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
+  args:
+    warn: false
+
+- name: Removing redundant config files (1/3)
+  file:
+    path: /home/pi/.kube
+    state: absent
+
+- name: Removing redundant config files (2/3)
+  file:
+    path: /home/pi/join.sh
+    state: absent
+
+- name: Removing redundant config files (3/3)
+  file:
+    path: /home/pi/kubelog.txt
+    state: absent
+
+- name: Initializing kubeadm
+  shell: kubeadm init --token-ttl=0 --pod-network-cidr 10.244.0.0/16 --apiserver-advertise-address={{ ansible_default_ipv4.address }} > kubelog.txt
+
+- name: Scraping the join token
+  shell: cat kubelog.txt | grep 'kubeadm join' > join.sh && sed "s/^[ \t]*//" -i join.sh
+  args:
+    warn: false
+  become: false
+
+- name: Fetching the joining script
+  fetch:
+    src: /home/pi/join.sh
+    dest: ./
+    flat: yes
+  become: false
+
+- name: Making a .kube directory in home
+  file:
+    path: /home/pi/.kube
+    state: directory
+  become: false
+
+- name: Copying admin config file to .kube directory
+  copy:
+    src: /etc/kubernetes/admin.conf
+    dest: /home/pi/.kube/config
+    remote_src: yes
+
+- name: Changing user and group ownership of the config file
+  shell: chown $(id -u):$(id -g) /home/pi/.kube/config
+  args:
+    warn: false
+
+- name: Installing Flannel
+  shell: curl -sSL https://rawgit.com/coreos/flannel/v0.10.0/Documentation/kube-flannel.yml | sed "s/amd64/arm/g" | kubectl create -f -
+  args:
+    warn: false
+  become: false
+
+- name: Pause a minute for system containers to spin up
+  pause:
+    minutes: 1
diff --git a/edge/sample/roles/clusterForm_slave(s)/tasks/main.yml b/edge/sample/roles/clusterForm_slave(s)/tasks/main.yml
new file mode 100644
index 0000000..206e86c
--- /dev/null
+++ b/edge/sample/roles/clusterForm_slave(s)/tasks/main.yml
@@ -0,0 +1,12 @@
+# Copyright (c) Authors of Clover
+#
+# All rights reserved. This program and the accompanying materials
+# are made available under the terms of the Apache License, Version 2.0
+# which accompanies this distribution, and is available at
+# http://www.apache.org/licenses/LICENSE-2.0
+
+- name: Resetting kubeadm on slaves
+  shell: kubeadm reset
+
+- name: Join the cluster, slaves!
+  script: join.sh
diff --git a/edge/sample/roles/clusterTear_common/tasks/main.yml b/edge/sample/roles/clusterTear_common/tasks/main.yml
new file mode 100644
index 0000000..64b1320
--- /dev/null
+++ b/edge/sample/roles/clusterTear_common/tasks/main.yml
@@ -0,0 +1,21 @@
+# Copyright (c) Authors of Clover
+#
+# All rights reserved. This program and the accompanying materials
+# are made available under the terms of the Apache License, Version 2.0
+# which accompanies this distribution, and is available at
+# http://www.apache.org/licenses/LICENSE-2.0
+
+- name: Resetting kubeadm
+  shell: kubeadm reset
+
+- name: Deleting the .kube config directory
+  file:
+    path: /home/pi/.kube
+    state: absent
+  when: "'master' in group_names"
+
+- name: Rebooting
+  shell: sleep 2 && reboot
+  async: 1
+  poll: 0
+  ignore_errors: true