Kubernetes drupal Installation (helm)

by Anish

Posted on Friday January 25, 2019

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Introduction

This sample chapter extracted from the book, Kubernetes for DevOps .

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

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

• Lets Begin deploying drupal 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 drupal for this we need to go and create PersistentVolume and PersistentVolumeClaim

PersistentVolume	PersistentVolumeClaim	Purpose
drupal-mariadb-pv	drupal-mariadb-pvc	for storing drupal tables
drupal-data-pv	drupal-data-pvc	for storing druplaa files
drupal-apache-pv	helm will create for us	Apache files

• Create drupal-mariadb-pv and drupal-mariadb-pvc

root@kube-master# echo "
apiVersion: v1
kind: PersistentVolume
metadata:
  name: drupal-mariadb-pv
spec:
  capacity: 
    storage: 4Gi
  accessModes:
    - ReadWriteOnce
    - ReadOnlyMany
  persistentVolumeReclaimPolicy: Retain
  hostPath:
    path: /data/
" | kubectl apply -f -

The drupal-mariadb-pvc

root@kube-master# echo "
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: data-drupal-mariadb-0
spec:
  storageClassName: ""
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi
" | kubectl apply -f -

• create drupal-data-pv and drupal-data-pvc

root@kube-master# echo "
apiVersion: v1
kind: PersistentVolume
metadata:
  name: drupal-data-pv
spec:
  capacity: 
    storage: 1Gi
  accessModes:
    - ReadWriteOnce
    - ReadOnlyMany
  persistentVolumeReclaimPolicy: Retain
  hostPath:
    path: /data/drupal
" | kubectl apply -f -

The drupal-data-pvc

root@kube-master# echo "
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: drupal-drupal-drupal
spec:
  storageClassName: ""
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi
" | kubectl apply -f -

• Create drupal-apache-pv

root@kube-master# echo "
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: drupal-drupal-drupal
spec:
  storageClassName: ""
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi
" | kubectl apply -f -

• Verify K8 pvc bounded to correct claims

root@kube-master:# kubectl get pvc
NAME                    STATUS    VOLUME              CAPACITY   ACCESS MODES   STORAGECLASS   AGE
data-drupal-mariadb-0   Bound     drupal-mariadb-pv   4Gi        RWO,ROX                       18s
drupal-drupal-drupal    Bound     drupal-data-pv      1Gi        RWO,ROX                       10s
root@kube-master:# kubectl get pv
NAME                CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS      CLAIM                           STORAGECLASS   REASON    AGE
drupal-apache-pv    1Gi        RWO,ROX        Retain           Available                                                            7s
drupal-data-pv      1Gi        RWO,ROX        Retain           Bound       default/drupal-drupal-drupal                             15s
drupal-mariadb-pv   4Gi        RWO,ROX        Retain           Bound       default/data-drupal-mariadb-0                            21s

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

helm install --set drupalUsername=admin,drupalPassword=mydrupalpassword,mariadb.mariadbRootPassword=secretpassword,persistence.drupal.existingClaim=drupal-drupal-drupal,mariadb.enabled=true,master.persistence.existingClaim=data-drupal-mariadb-0 --name drupal stable/drupal

This will produce lot of useful resource information related to DRUPAL

NAME:   drupal
LAST DEPLOYED: Fri Jan 25 16:25:21 2019
NAMESPACE: default
STATUS: DEPLOYED

RESOURCES:
==> v1/Pod(related)
NAME                            READY  STATUS             RESTARTS  AGE
drupal-drupal-7965fbcbb9-kp9v7  0/1    ContainerCreating  0         3s
drupal-mariadb-0                0/1    ContainerCreating  0         3s

==> v1/Secret
NAME            TYPE    DATA  AGE
drupal-mariadb  Opaque  2     3s
drupal-drupal   Opaque  1     3s

==> v1/ConfigMap
NAME                  DATA  AGE
drupal-mariadb        1     3s
drupal-mariadb-tests  1     3s

==> v1/PersistentVolumeClaim
NAME                  STATUS  VOLUME            CAPACITY  ACCESS MODES  STORAGECLASS  AGE
drupal-drupal-apache  Bound   drupal-apache-pv  1Gi       RWO,ROX       3s

==> v1/Service
NAME            TYPE          CLUSTER-IP      EXTERNAL-IP  PORT(S)                     AGE
drupal-mariadb  ClusterIP     10.97.114.226   <none>       3306/TCP                    3s
drupal-drupal   LoadBalancer  10.103.184.148  <pending>    80:31127/TCP,443:31178/TCP  3s

==> v1beta1/Deployment
NAME           DESIRED  CURRENT  UP-TO-DATE  AVAILABLE  AGE
drupal-drupal  1        1        1           0          3s

==> v1beta1/StatefulSet
NAME            DESIRED  CURRENT  AGE
drupal-mariadb  1        1        3s


NOTES:

*******************************************************************
*** PLEASE BE PATIENT: Drupal may take a few minutes to install ***
*******************************************************************

1. Get the Drupal 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 drupal-drupal'

  export SERVICE_IP=$(kubectl get svc --namespace default drupal-drupal --template "{{ range (index .status.loadBalancer.ingress 0) }}{{.}}{{ end }}")
  echo "Drupal URL: http://$SERVICE_IP/"

2. Login with the following credentials

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

• Once the drupal POD is up and running , your drupal is not ready to use Yet , you have to be patient, depend on your network speed, it will take further 3-4 minutes

root@kube-master:# kubectl get pods

• To get your drupal admin password run

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

• Verify the drupal service is up and running and external-ip column is no more pending

root@kube-master:/home/ansible# kubectl get svc 
NAME             TYPE           CLUSTER-IP       EXTERNAL-IP   PORT(S)                      AGE
drupal-drupal    LoadBalancer   10.103.184.148   172.16.2.13   80:31127/TCP,443:31178/TCP   3m
drupal-mariadb   ClusterIP      10.97.114.226    <none>        3306/TCP                     3m
kubernetes       ClusterIP      10.96.0.1        <none>        443/TCP                      2d

• Open the web browser and browse your loadbalancer ip
  
• Happy Helming and since its kubernetes you may encounter some issues, feel free to poke me

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