Ansible playbooks to build Kubernetes

Ansible playbooks to building the hard way Kubernetes cluster, This playbook is a fully automated command to bring up a Kubernetes cluster on VM or Baremetal.

Feature list:

• Support build virtual cluster using vagrant.
• Kubernetes v1.7.0+.
• Kubernetes common addons.
• Support CNI(calico, flannel, ..., etc) and CRI(docker, containerd).
• Build HA using Keepalived and HAProxy.
• Ingress controller.
• Ceph on Kubernetes(v10.2.0+).

Quick Start

In this section you will deploy a cluster using vagrant.

Prerequisites:

• Ansible version: v2.4 (or newer).
• Vagrant: >= 1.7.0.
• VirtualBox: >= 5.0.0.
• Mac OS X need to install sshpass tool.

$ brew install http://git.io/sshpass.rb

The getting started guide will use Vagrant with VirtualBox. It can deploy your Kubernetes cluster with a single command:

$ ./tools/setup -m 2048 -n calico -i eth1
Cluster Size: 1 master, 2 worker.
     VM Size: 1 vCPU, 2048 MB
     VM Info: ubuntu16, virtualbox
         CNI: calico, Binding iface: eth1
Start deploying?(y):

• Use sudo ./tools/setup -p libvirt -i eth1 command to setup libvirt provider .

If you want to access API you need to create RBAC object define the permission of role. For example using cluster-admin role:

$ kubectl create clusterrolebinding open-api --clusterrole=cluster-admin --user=system:anonymous

Login the addon's dashboard:

• Dashboard: https://API_SERVER:6443/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy/
• Logging: https://API_SERVER:6443/api/v1/proxy/namespaces/kube-system/services/kibana-logging
• Monitor: https://API_SERVER:6443/api/v1/proxy/namespaces/kube-system/services/monitoring-grafana

As of release 1.7 Dashboard no longer has full admin privileges granted by default, so you need to create a token to access the resources:

$ kubectl -n kube-system create sa dashboard
$ kubectl create clusterrolebinding dashboard --clusterrole cluster-admin --serviceaccount=kube-system:dashboard
$ kubectl -n kube-system get sa dashboard -o yaml
apiVersion: v1
kind: ServiceAccount
metadata:
  creationTimestamp: 2017-11-27T17:06:41Z
  name: dashboard
  namespace: kube-system
  resourceVersion: "69076"
  selfLink: /api/v1/namespaces/kube-system/serviceaccounts/dashboard
  uid: 56b880bf-d395-11e7-9528-448a5ba4bd34
secrets:
- name: dashboard-token-vg52j

$ kubectl -n kube-system describe secrets dashboard-token-vg52j
...
token:      eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJrdWJlcm5ldGVzL3NlcnZpY2VhY2NvdW50Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9uYW1lc3BhY2UiOiJrdWJlLXN5c3RlbSIsImt1YmVybmV0ZXMuaW8vc2VydmljZWFjY291bnQvc2VjcmV0Lm5hbWUiOiJkYXNoYm9hcmQtdG9rZW4tdmc1MmoiLCJrdWJlcm5ldGVzLmlvL3NlcnZpY2VhY2NvdW50L3NlcnZpY2UtYWNjb3VudC5uYW1lIjoiZGFzaGJvYXJkIiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9zZXJ2aWNlLWFjY291bnQudWlkIjoiNTZiODgwYmYtZDM5NS0xMWU3LTk1MjgtNDQ4YTViYTRiZDM0Iiwic3ViIjoic3lzdGVtOnNlcnZpY2VhY2NvdW50Omt1YmUtc3lzdGVtOmRhc2hib2FyZCJ9.bVRECfNS4NDmWAFWxGbAi1n9SfQ-TMNafPtF70pbp9Kun9RbC3BNR5NjTEuKjwt8nqZ6k3r09UKJ4dpo2lHtr2RTNAfEsoEGtoMlW8X9lg70ccPB0M1KJiz3c7-gpDUaQRIMNwz42db7Q1dN7HLieD6I4lFsHgk9NPUIVKqJ0p6PNTp99pBwvpvnKX72NIiIvgRwC2cnFr3R6WdUEsuVfuWGdF-jXyc6lS7_kOiXp2yh6Ym_YYIr3SsjYK7XUIPHrBqWjF-KXO_AL3J8J_UebtWSGomYvuXXbbAUefbOK4qopqQ6FzRXQs00KrKa8sfqrKMm_x71Kyqq6RbFECsHPA

Copy and paste the token to dashboard.

Manual deployment

In this section you will manually deploy a cluster on your machines.

Prerequisites:

• Ansible version: v2.4.0 (or newer).
• Linux distributions: Ubuntu 16+/CentOS 7.x.(CoreOS and SUSE coming soon)
• All Master/Node should have password-less access from Deploy node.

For machine example:

IP Address	Role	CPU	Memory
172.16.35.9	vip	-	-
172.16.35.13	master1	4	8G
172.16.35.10	node1	4	8G
172.16.35.11	node2	4	8G
172.16.35.12	node3	4	8G

Add the machine info gathered above into a file called inventory. For inventory example:

[etcds]
172.16.35.13

[masters]
172.16.35.13

[nodes]
172.16.35.[10:12]

[kube-cluster:children]
masters
nodes

[kube-addon:children]
masters

Set the variables in group_vars/all.yml to reflect you need options. For example:

# Kubenrtes version, only support 1.7.0+.
kube_version: 1.8.4

# CRI plugin,
# Supported runtime: docker, containerd.
cri_plugin: docker

# CNI plugin,
# Supported network: flannel, calico, canal, weave or router.
network: calico
pod_network_cidr: 10.244.0.0/16

# CNI opts: flannel(--iface=enp0s8), calico(interface=enp0s8), canal(enp0s8).
cni_iface: interface=eth1

lb_vip_address: 172.16.35.9

# Extra addons
kube_dashboard: true
kube_monitoring: true

Deploy a Kubernetes cluster

If everything is ready, just run cluster.yml to deploy cluster:

$ ansible-playbook cluster.yml

And then run addons.yml to create addons:

$ ansible-playbook addons.yml

Reset cluster

You can reset cluster with the reset.yml playbook:

$ ansible-playbook reset.yml

Verify cluster

Now, check the service as follow:

$ kubectl get po,svc --namespace=kube-system

NAME                                 READY     STATUS    RESTARTS   AGE       IP             NODE
po/haproxy-master1                   1/1       Running   0          2h        172.16.35.13   master1
...