Kubernetes wordpress Installation (helm)

Posted on Thursday Jnauary 17, 2019

Introduction

In this article we will learn how to to setup wordpress in kubernetes cluster using helm

Helm: Helm is a tool for managing Kubernetes charts. Charts are packages of pre-configured Kubernetes resources.

Let's Begin deploying wordpress using helm in kubernetes , if you are new to helm then download and initialize helm as follows

[email protected]:#  helm init
[email protected]:# kubectl create serviceaccount --namespace kube-system tiller
[email protected]:# kubectl create clusterrolebinding tiller-cluster-rule \
   --clusterrole=cluster-admin --serviceaccount=kube-system:tiller
[email protected]:#  kubectl patch deploy --namespace kube-system tiller-deploy \
   -p '{"spec":{"template":{"spec":{"serviceAccount":"tiller"}}}}'

Make sure the title-deploy pod is up and running

[email protected]:/home/ansible# kubectl get pods -n kube-system 
NAME                                  READY     STATUS    RESTARTS   AGE
coredns-78fcdf6894-jvmlb              1/1       Running   0          1h
coredns-78fcdf6894-xstbn              1/1       Running   0          1h
etcd-kube-master                      1/1       Running   0          1h
kube-apiserver-kube-master            1/1       Running   0          1h
kube-controller-manager-kube-master   1/1       Running   0          1h
kube-flannel-ds-5gzn9                 1/1       Running   0          1h
kube-flannel-ds-tlc8j                 1/1       Running   0          1h
kube-proxy-kl4fg                      1/1       Running   0          1h
kube-proxy-krt6n                      1/1       Running   0          1h
kube-scheduler-kube-master            1/1       Running   0          1h
tiller-deploy-85744d9bfb-wh98g        1/1       Running   0          1h

Once titler pod is up and running, deploying wordpress uses bitnami docker images, for this we need to go and create PersistentVolume and PersistentVolumeClaim
Define the PersistentVolume for mariadb-pv where the mariadb data to be stored. The hostPath tells the mysql directory is in /bitnami/mariadb location

[email protected]:# cat mariadb-hostpath.yaml 
apiVersion: v1
kind: PersistentVolume
metadata:
  name: mariadb-pv
spec:
  capacity: 
    storage: 1Gi
  accessModes:
    - ReadWriteOnce
    - ReadOnlyMany
  persistentVolumeReclaimPolicy: Retain
  hostPath:
    path: /bitnami/mariadb

[email protected]:# kubectl create -f  mariadb-hostpath.yaml 
persistentvolume/mariadb-pv created

Define the PersistentVolume for wordpress-pv where the wordpress site data to be stored. The hostPath tells the mysql directory is in /data location

[email protected]:# cat wordpress-hostpath.yaml 
apiVersion: v1
kind: PersistentVolume
metadata:
  name: wordpress-pv
spec:
  capacity: 
    storage: 1Gi
  accessModes:
    - ReadWriteOnce
    - ReadOnlyMany
  persistentVolumeReclaimPolicy: Retain
  hostPath:
    path: /data

[email protected]:# kubectl create -f  wordpress-hostpath.yaml
persistentvolume/wordpress-pv created

Define PersistentVolumeClaim data-wordpress-mariadb-0 and wordpress-wordpress

[email protected]:# cat wordpress-mariadb-pvc.yaml
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: data-wordpress-mariadb-0
spec:
  storageClassName: ""
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi

[email protected]:# cat wordpress-pvc.yaml 
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: wordpress-wordpress
spec:
  storageClassName: ""
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi

Create PersistentVolumeClaim in kube cluster

[email protected]:# kubectl create -f wordpress-mariadb-pvc.yaml 
[email protected]:# kubectl create -f wordpress-pvc.yaml

Check the PersistentVolumeClaim is bounded to mysql-pv and wordpress-pv

[email protected]:# kubectl get pvc
NAME                       STATUS    VOLUME         CAPACITY   ACCESS MODES   STORAGECLASS   AGE
data-wordpress-mariadb-0   Bound     mariadb-pv     1Gi        RWO,ROX                       1d
wordpress-wordpress        Bound     wordpress-pv   1Gi        RWO,ROX                       1d

[email protected]:/home/ansible# kubectl get pv 
NAME           CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS    CLAIM                              STORAGECLASS   REASON    AGE
mariadb-pv     1Gi        RWO,ROX        Retain           Bound     default/data-wordpress-mariadb-0                            1d
wordpress-pv   1Gi        RWO,ROX        Retain           Bound     default/wordpress-wordpress

Wordpress Installation starts here, this is done through helm the kubernetes package manager,

while setting up wordpress cluster the persistence.existingClaim=wordpress-wordpressc is set which we have created earlier for manual change use the below setting

Kubernetes wordpress Installation (helm)

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