Creating a HA kubernetes cluster from Scratch.

This project is helping you to creating a HA kubernetes cluster step by step.

Install Overview:

	version	service management
docker	18.06.1-ce	systemd
kubelet	v1.13.0	systemd
kube-proxy	v1.13.0	systemd
etcd	3.2.24	kubelet/docker
kube-apiserver	v1.13.0	kubelet/docker
kube-controller-manager	v1.13.0	kubelet/docker
kube-scheduler	v1.13.0	kubelet/docker

Arch： Docs: Creating a Custom Cluster from Scratch docker install official document installing calico for kubernetes

Setup:

1. Download the tarball from the release page kubernetes release page.

   $tar -zxvf kubernetes.tar.gz
   $cd kubernetes/cluster/ && bash get-kube.sh
   $cd kubernetes/cluster/kubernetes/server && tar -zxvf kubernetes-server-linux-amd64.tar.gz
   $ls kubernetes/server/bin/ 
   

   Copy the kubelet、kube-proxy to the binaries dir.

2. change the cluster info in prepare.sh and ansible hosts and my-kubernetes-cluster.yaml here is my cluster config. you may change thess vars later. ansible hosts:

   all:
     children:
       kubernetes:
         children:
           master:
             hosts:
               master1.kubernetes.test: 
                 ansible_host: 172.16.0.101
               master2.kubernetes.test:
                 ansible_host: 172.16.0.102
               master3.kubernetes.test:
                 ansible_host: 172.16.0.103
             vars:
               ansible_user: root
           node:
             hosts:
               node1.kubernetes.test:
                 ansible_host: 172.16.0.104
   	        node2.kubernetes.test:
                 ansible_host: 172.16.0.105
               node3.kubernetes.test:
                 ansible_host: 172.16.0.106
             vars:
               ansible_user: root
   

   prepare.sh

   CLUSTER_NAME=my-kubernetes-cluster
   CLUSTER_API_HOSTNAME=apisever.kubernetes.test
   CLUSTER_CIDR=10.0.0.0/16
   CLUSTER_DATA_PATH=/data/kubernetes
   CLUSTER_MASTER_LIST=("master1.kubernetes.test"  "master2.kubernetes.test"  "master3.kubernetes.test")
   DOCKER_DATA_ROOT_DIR=/data/docker
   

3. Generate tls keys、kubeconfig files、ansible vars.

$bash prepare.sh
	  ...

4. use ansible-playbook to bootstarp the cluster.

$ansible-playbook my-kubernetes-cluster.yaml

5. the cluster has been setup ready for work.

Check everything is work.

etcd cluster overview:

$etcdctl member list
8947ad53cf2dcb09: name=master2 peerURLs=http://172.16.0.102:2380 clientURLs=http://172.16.0.102:2379 isLeader=false
902b43a26fe9e976: name=master3 peerURLs=http://172.16.0.103:2380 clientURLs=http://172.16.0.103:2379 isLeader=false
c130f4a591f954a9: name=master1 peerURLs=http://172.16.0.101:2380 clientURLs=http://172.16.0.101:2379 isLeader=true

kube-apiserver overview:

NAMESPACE     NAME                                              READY     STATUS    RESTARTS   AGE
kube-system   kube-apiserver-master1.kubernetes.test            1/1       Running   0         1m
kube-system   kube-apiserver-master2.kubernetes.test            1/1       Running   0         1m
kube-system   kube-apiserver-master3.kubernetes.test            1/1       Running   0         1m

kube-controller-manager overview:

NAMESPACE     NAME                                              READY     STATUS    RESTARTS   AGE
kube-system   kube-controller-manager-master1.kubernetes.test   1/1       Running   0          1m
kube-system   kube-controller-manager-master2.kubernetes.test   1/1       Running   0          1m
kube-system   kube-controller-manager-master3.kubernetes.test   1/1       Running   0          1m

kube-scheduler overview:

kube-system   kube-scheduler-master1.kubernetes.test            1/1       Running   17         3d
kube-system   kube-scheduler-master2.kubernetes.test            1/1       Running   16         5d
kube-system   kube-scheduler-master3.kubernetes.test            1/1       Running   12         6d