Kubernetes wordpress Installation (helm)

by Anish

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

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

• Make sure the title-deploy pod is up and running

root@kube-master:/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

root@kube-master:# 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

root@kube-master:# 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

root@kube-master:# cat wordpress-hostpath.yaml 
apiVersion: v1
kind: PersistentVolume
metadata:
  name: wordpress-pv
spec:
  capacity: 
    storage: 1Gi
  accessModes:
    - ReadWriteOnce
    - ReadOnlyMany
  persistentVolumeReclaimPolicy: Retain
  hostPath:
    path: /data

root@kube-master:# kubectl create -f  wordpress-hostpath.yaml
persistentvolume/wordpress-pv created

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

root@kube-master:# cat wordpress-mariadb-pvc.yaml
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: data-wordpress-mariadb-0
spec:
  storageClassName: ""
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi

root@kube-master:# 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

root@kube-master:# kubectl create -f wordpress-mariadb-pvc.yaml 
root@kube-master:# kubectl create -f wordpress-pvc.yaml

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

root@kube-master:# 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

root@kube-master:/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

root@kube-master:# helm install --name wordpress \
  --set wordpressUsername=admin,wordpressPassword=adminpassword,mariadb.mariadbRootPassword=secretpassword,persistence.existingClaim=wordpress-wordpress,allowEmptyPassword=false \
    stable/wordpress


NAME:   wordpress
LAST DEPLOYED: Thu Jan 17 11:03:43 2019
NAMESPACE: default
STATUS: DEPLOYED

RESOURCES:
==> v1/Service
NAME                 TYPE          CLUSTER-IP      EXTERNAL-IP  PORT(S)                     AGE
wordpress-mariadb    ClusterIP     10.106.188.168  <none>       3306/TCP                    2s
wordpress-wordpress  LoadBalancer  10.98.185.111   <pending>    80:31086/TCP,443:31639/TCP  2s

==> v1beta1/Deployment
NAME                 DESIRED  CURRENT  UP-TO-DATE  AVAILABLE  AGE
wordpress-wordpress  1        1        1           0          2s

==> v1beta1/StatefulSet
NAME               DESIRED  CURRENT  AGE
wordpress-mariadb  1        1        2s

==> v1/Pod(related)
NAME                                  READY  STATUS             RESTARTS  AGE
wordpress-wordpress-7b74f59c78-l7qvz  0/1    ContainerCreating  0         2s
wordpress-mariadb-0                   0/1    ContainerCreating  0         2s

==> v1/Secret
NAME                 TYPE    DATA  AGE
wordpress-mariadb    Opaque  2     2s
wordpress-wordpress  Opaque  1     2s

==> v1/ConfigMap
NAME                     DATA  AGE
wordpress-mariadb        1     2s
wordpress-mariadb-tests  1     2s


NOTES:
1. Get the WordPress URL:

  NOTE: It may take a few minutes for the LoadBalancer IP to be available.
        Watch the status with: 'kubectl get svc --namespace default -w wordpress-wordpress'
  export SERVICE_IP=$(kubectl get svc --namespace default wordpress-wordpress --template "{{ range (index .status.loadBalancer.ingress 0) }}{{.}}{{ end }}")
  echo "WordPress URL: http://$SERVICE_IP/"
  echo "WordPress Admin URL: http://$SERVICE_IP/admin"

2. Login with the following credentials to see your blog

  echo Username: admin
  echo Password: $(kubectl get secret --namespace default wordpress-wordpress -o jsonpath="{.data.wordpress-password}" | base64 --decode)

• if you have already mariadb installed and want to connect externally then use

helm install stable/wordpress \
     --set mariadb.enabled=false,externalDatabase.host=myexternalhost,externalDatabase.user=myuser,externalDatabase.password=mypassword,externalDatabase.database=mydatabase,externalDatabase.port=3306

• View the wordpress container pod is up and running

root@kube-master:# kubectl get pods --watch
NAME                                   READY     STATUS    RESTARTS   AGE
wordpress-mariadb-0                    1/1       Running   0          51s
wordpress-wordpress-7b74f59c78-l7qvz   0/1       Running   0          51s

• Once the wordpress POD is up and running , your wordpress is ready to use

• To get your wordpress admin password run

root@kube-master:# kubectl get secret --namespace default wordpress-wordpress -o jsonpath="{.data.wordpress-password}" | base64 --decode
adminpassword

• Verify the wordpress serivce is up and running, the helm deployment use nodeType=Loadbalancer which will be pending

root@kube-master:# kubectl get svc 
NAME                  TYPE           CLUSTER-IP       EXTERNAL-IP   PORT(S)                      AGE
kubernetes            ClusterIP      10.96.0.1        <none>        443/TCP                      1d
wordpress-mariadb     ClusterIP      10.106.188.168   <none>        3306/TCP                     1m
wordpress-wordpress   LoadBalancer   10.98.185.111    <pending>     80:31086/TCP,443:31639/TCP   1m

• I did a Hack here, since the setup is on barematel, a VIP is added manually to k8 master nodes to excess the node port 31086
• Open the web browser and browse through your VIP address with Node port http://<<VIP>>:31086/admin to access wordpress admin page
  
• On successful login you will be seeing the dashbaord page
  
• The wordpress installation is done in this example is not meant for production refer to helm wordpress chart to customize the value
• Happy Helming and since it's kubernetes you may encounter some issues, feel free to poke me

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