kratochj / kubernetes-cluster-vagrant

Create Kubernetes cluster with Vagrant

Kubernetes Cluster with Vagrant

This is example how to easily install Kubernetes cluster with Vagrant. By default vagrant spin up one master and three nodes (workers).

Requirements

• Virtual Box
• Vagrant

Quick start

Run vagrant command to spin machines up:

$ vagrant up 

...wait couple of minutes...

You have running k8s cluster

Install HA Wordpress on running cluster

Steps in this section should be performed on Kubernetes master (or Kubernete client via kubectl).

1. Create Persistent Volumes

$ kubectl create -f https://raw.githubusercontent.com/kratochj/kubernetes-cluster-vagrant/master/pods/nfs-db.yaml
$ kubectl create -f https://raw.githubusercontent.com/kratochj/kubernetes-cluster-vagrant/master/pods/nfs-web.yaml

Check whether volumes were created:

$ kubectl get pv
NAME      CAPACITY   ACCESSMODES   STATUS      CLAIM     REASON    AGE
pv5gdb    5Gi        RWX           Available                       1m
pv5gweb   5Gi        RWX           Available                       1m

2. Create Persistent Volume Claims

$ kubectl create -f https://raw.githubusercontent.com/kratochj/kubernetes-cluster-vagrant/master/pods/claim-db.yaml
$ kubectl create -f https://raw.githubusercontent.com/kratochj/kubernetes-cluster-vagrant/master/pods/claim-web.yaml

Check volumes and claims:

$ kubectl get pv,pvc
NAME              CAPACITY   ACCESSMODES   STATUS     CLAIM                 REASON    AGE
pv/pv5gdb         5Gi        RWX           Bound      default/myclaim-db              6m
pv/pv5gweb        5Gi        RWX           Bound      default/myclaim-web             6m
NAME              STATUS     VOLUME        CAPACITY   ACCESSMODES           AGE
pvc/myclaim-db    Bound      pv5gdb        5Gi        RWX                   14s
pvc/myclaim-web   Bound      pv5gweb       5Gi        RWX                   10s

Now we are ready to deploy application cluster.

3. Deploy MySQL

MySQL is the backend for the Wordpress. We need to create a definition file called mysql-pod.yaml. Before that, we need create password file and import password from that file into k8s secure store. Make sure password.txt does not have a trailing newline

$ kubectl create secret generic mysql-pass --from-file=password.txt

... and then deploy:

$ kubectl create -f https://raw.githubusercontent.com/kratochj/kubernetes-cluster-vagrant/master/pods/mysql-pod.yaml

Next, we need dedicatexd IP address for MySQL service (clusterIP) so all Wordpress pods are connected to this one single MySQL database.

apiVersion: v1
kind: Service
metadata:
  labels:
    name: mysql
  name: mysql
spec:
  clusterIP: 10.254.10.20
  ports:
    - port: 3306
  selector:
    name: mysql

deploy it:

$ kubectl create -f https://raw.githubusercontent.com/kratochj/kubernetes-cluster-vagrant/master/pods/mysql-service.yaml

Here is how to check if everything is deployed:

$ kubectl get pods,services
NAME             READY          STATUS              RESTARTS   AGE
po/mysql         0/1            ContainerCreating   0          29s
NAME             CLUSTER-IP     EXTERNAL-IP         PORT(S)    AGE
svc/kubernetes   10.254.0.1     <none>              443/TCP    1h
svc/mysql        10.254.10.20   <none>              3306/TCP   17s

Check IP address for the mysql service must match the clusterIP defined inside mysql-service.yaml. We are going to use that IP address as MySQL host for the Wordpress pods as described in the next section.