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https://github.com/odennav/wordpress-mariadb-helm

Use Terraform to provision infrastructure in AWS and deploy WordPress with MariaDB in Kubernetes Cluster using Helm Chart
https://github.com/odennav/wordpress-mariadb-helm

ansible aws aws-ec2 cert-manager cloudflare helm-chart letsencrypt mariadb-database nfs-server nginx-ingress-controller persistent-storage prometheus prometheus-metrics pv pvc terraform tls-certificate wordpress-site

Last synced: 29 days ago
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Use Terraform to provision infrastructure in AWS and deploy WordPress with MariaDB in Kubernetes Cluster using Helm Chart

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README 

        
# Deploy WordPress with MariaDB in Kubernetes Cluster.



Provision infrastructure in AWS and deploy WordPress with MariaDB in Kubernetes Cluster using Helm charts.



----



## Getting Started



There are six sections to follow and implement as shown below:

- Provision AWS Infrastructure



- Set up Kubernetes cluster and NFS srver



- Create Dynamic Persistent Volume Provisioner



- Install Wordpress and MariaDB with Helm charts



- Connect to Wordpress and MariaDB



- Testing Data Persistence



- Securing Traffic with Let's Encrypt Certificates



- Enable WordPress monitoring metrics



-----



## Provision AWS Infrastructure



Clone this repo to local machine



```bash

cd /

git clone [email protected]:odennav/wordpress-mariadb-helm.git

cd terraform-kubernetes-aws-ec2/terraform-manifest

```



**Provision AWS resources**



Execute these terraform commands sequentially on your `local` machine to create the AWS infrastructure.



```bash

cd terraform-manifest

```



Initialize the terraform working directory



```bash

terraform init

```



Validate the syntax of the terraform configuration files



```bash

terraform validate

```



Create an execution plan that describes the changes terraform will make to the infrastructure.



```bash

terraform plan

```



Apply the changes described in execution plan

```bash

terraform apply -auto-approve

```

Check AWS console for instances created and running



**SSH Access**



Use .pem key from AWS to SSH into the public EC2 instance.



IPv4 address of public EC2 instance will be shown in terraform outputs.



```bash

ssh -i private-key/terraform-key.pem ec2-user@

```

Its possible to use public `EC2` instance as a jumpbox to securely SSH into private EC2 instances within the VPC.



Change password of root user for public EC2instance `control-dev`



```bash

sudo passwd

   ```

Switch to root user



Update `apt` package manager

```bash

cd /

apt update -y

apt upgrade -y

```



Confirm Git was installed 

```bash

git --version

```



Confirm `terraform-key` was transferred to public `EC2` instance by null provisioner



Please note if `.pem` key not found, copy it manually.



Also key can be copied to another folder because it will be deleted if node is restarted or shutdown

```bash

ls -la /tmp/terraform-key.pem

cp /tmp/terraform-key.pem /

```



Change permissions of `terraform-key.pem` file



```bash

chmod 400 /tmp/terraform-key.pem

```



Clone this repo to `/` directory in `dev-Control` node

   ```bash

   cd /

   git clone [email protected]:odennav/terraform-kubernetes-aws-ec2.git

   ```



-----



## Set up Kubernetes Cluster and NFS Server



Install Ansible in `dev-Control` node



```bash

sudo apt install software-properties-common

sudo add-apt-repository --yes --update ppa:ansible/ansible

sudo apt install ansible

```



**Bootstrap EC2 Private Instances**

   

All the nodes need to be bootstrapped.



Once the bootstrap is complete, you will only be able to log in as `odennav-admin`.



Confirm SSH access to `k8snode-1`   

```bash

ssh -i /tmp/terraform-key.pem  odennav-admin@

```  

To return to `dev-Control`, type `exit` and press `Enter` or use `Ctrl+D`.

   

Confirm SSH access to `k8snode-2`

```bash

ssh -i /tmp/terraform-key.pem  odennav-admin@

```  

  

Confirm SSH access to `k8snode-3`

```bash

ssh -i /tmp/terraform-key.pem odennav-admin@

```



Now you can now bootstrap them

```bash

cd ../bootstrap

ansible-playbook bootstrap.yml --limit k8s_master,k8s_node

```



**Set up Kubernetes Cluster**



Your kube nodes are now ready to have a Kubernetes cluster installed on them.



Execute playbooks in this particular order:



```bash

cd ../k8s

ansible-playbook k8s.yml  --limit k8s_master

ansible-playbook k8s.yml  --limit k8s_node

```



Check status of your nodes and confirm they're ready

```bash

kubectl get nodes

```



**Bootstrap the NFS Server**

   

Bootstrap this server.



Once the bootstrap is complete you will only be able to log in as `odennav-admin`



```bash

cd ../ansible/bootstrap

ansible-playbook bootstrap.yml --limit nfs_server

```



Create NFS share



```bash

cd ../nfs

ansible-playbook nfs.yml

```



`/pv-share/` directory is created and made available to all nodes, but its not mounted yet by the nodes

   

   

Login to 1st node in cluster



```bash

ssh -i /tmp/terraform-key.pem odennav-admin@

```



Confirm nfs client is installed 

```bash

dpkg -l | grep nfs-common

```



If not available:

```bash

sudo apt install nfs-common

```



Create shared directory and mount nfs share



This directory will be mounted to `/pv-share/` created in NFS server.



```bash

cd /

sudo mkdir /shared

sudo chmod 2770 /shared

sudo mount -t nfs :/pv-share /shared

```



Confirm NFS share is implemented



Make a test file in `/shared/` dir on the cluster node. It should be present in `/pv-share/` dir on nfsserver.



```bash

sudo touch test-k8smaster

```



Repeat process for the other kubernetes cluster nodes.



-----



## Create Dynamic Persistent Volume Provisioner



Persistent storage is required to store very important data and avoiding total loss of data.



Kubernetes deals with pods that have short life span, they could be stopped at any time and restarted on a different node, causing the container's filesystem to be lost with the pod.



This is not reliable, hence the need for filesystem that is available and accessibleirrespective of pod actions.



PV is configured to use different types of storage technology such as:



- CephFS

- iSCSI

- NFS

- Azure File



We will use Network File System (NFS) which is a way of sharing a centralised filesystem across multiple nodes. 



Although persistent storage is managed by kubernetes in the cluster, the actual storage is on nfs server which is not part of the kubernetes cluster and it is on different subnet.



![](https://github.com/odennav/wordpress-mariadb-helm/blob/main/docs/1.png)



### Persistent Volume



Creating a PV within your cluster, tells Kubernetes that pods should have access to persistent storage that will outlive the pod and possibly the cluster itself.



### Persistent Volume Claims



We want pods to access the PV created. To do this, a Persistent Volume Claim or PVC is required. 



When PVC is created within a namespace, only pods in that namespace can mount it. However, it can be bound to any PV as these are not namespaced.



It is possible that Kubernetes cannot bind the PVC to a valid PV and that the PVC remains unbound until a PV becomes available.



This will lead to instances of pods in `Pending` state instead of `Running` state and PVC having `Unbound` status.



### Mounting PVC



Here access to PVC in the pod is done by mounting the storage as a volume within the container.



Once PVC is mounted by the pod, the application within the Pod’s container(s) now have access to the persistent storage.



Upon reschedule of pod(s), it will be reconnected to the same PV and will have access to the data it was using before it died, even if this is on another node.



Login to `k8smaster` and Confirm `Helm` is installed



Helm is an effective package manager for kubernetes



```bash

helm version

```



If not installed

```bash

sudo snap install helm --classic

```



Confirm persistent volume provisioner installed

   

```bash

kubectl get all -n nfs-provisioner

kubectl get sc -n nfs-provisioner

```

This should show dynamic provisioner setup and ready.



If `PV provisioner` not installed, do it manually:



```bash

helm repo add nfs-subdir-external-provisioner https://kubernetes-sigs.github.io/nfs-subdir-external-provisioner

helm install -n nfs-provsioner --create-namespace nfs-subdir-external-provisioner nfs-subdir-external-provisioner/nfs-subdir-external-provisioner --set nfs.server= --set nfs.path=/pv-share

```



**Setup PVC for Wordpress**

   

Our PV provisioner installed will dynamically provision PVs when PVCs are created.



We'll use kubens to switch between kubernetes namespaces.



```bash

sudo snap install kubectx --classic

kubens --version

```



Create wordpress namespace



Assuming you've `kubectl` installed along with kubernetes cluster.



```bash

kubectl create namespace wordpress

kubens wordpress

```



Create PVC request on k8smaster



```bash

kubectl create -f wp-pvc.yaml

```



**Configure Wordpress Parameters**

   

Match this parameters and replace the values, so we have an account to access Wordpress



- *wordpressUsername*

   

- *wordpressPassword*

   

- *wordpressEmail*

   

- *wordpressFirstName*

   

- *wordpressLastName*

   

- *wordpressBlogName*



- *wordpressScheme*



```bash

sed -i '/wordpressUsername: user/wordpressUsername: odennav/' values.yaml

sed -i '/wordpressPassword: ""/wordpressPassword: odennav/' values.yaml

sed -i '/wordpressEmail: [email protected]/wordpressEmail: [email protected]/' values.yaml

sed -i '/wordpressFirstName: FirstName/wordpressFirstName: odennav/' values.yaml

sed -i '/wordpressLastName: LastName/wordpressLastName: odennav/' values.yaml

sed -i '/wordpressBlogName: User's Blog!/wordpressBlogName: The Odennav Blog!/' values.yaml

sed -i '/wordpressScheme: http/wordpressScheme: https/' values.yaml

```



**Configure Persistence and Database Parameters**



Enable persistence using persistence volume claims and peristence volume access modes.



Match and replace values for persistence and database parameters below:



- *persistence.storageClass*

   

- *persistence.existingClaim*

   

- *mariadb.primary.persistence.storageClass*

   

- *mariadb.auth.username*

   

- *mariadb.auth.password*



```bash

sed -i '/persistence:/,/volumePermissions:/ {/storageClass: ""/s/""/nfs-client}' values.yaml

sed -i '/persistence:/,/volumePermissions:/ {/existingClaim: ""/s/""/pvc-wordpress}' values.yaml   

sed -i '/mariadb:/,/externalDatabase:/ {/storageClass: ""/s/""/nfs-client}' values.yaml

sed -i '/mariadb:/,/externalDatabase:/ {/username: bn_wordpress/s/bn_wordpress/odennav_wordpress}' values.yaml

sed -i '/mariadb:/,/externalDatabase:/ {/password: ""/s/""/odennav}' values.yaml

```



**Configure PVC Access Modes**

   

To access the `/admin` portal and enable WordPress scalability, a `ReadWriteMany` Persistent Volume Claim (PVC) is required.



      

- *persistence.accessModes*

      

- *persistence.accessMode*



```bash

sed -i 's/ReadWriteOnce/ReadWriteMany/g' values.yaml

```



**Configure Replica Count**



Number of Wordpress replicas to deploy

   

- *replicaCount*



```bash

sed -i '/replicaCount: 1/replicaCount: 3/' values.yaml

```



**Configure Auto Scaling**

   

Enable horizontal scalability of pod resources for Wordpress when traffic load is increased



- *autoscaling.enabled*



```bash

sed -i '/autoscaling:/,/metrics:/ {/enabled: false/s/"false"/true}' values.yaml

```



**Configure htaccess**

   

For performance and security reasons, configure Apache with AllowOverride None and prohibit overriding directives with htaccess files

   



- *allowOverrideNone*



```bash

sed -i '/allowOverrideNone: false/allowOverrideNone: true/' values.yaml

```



-----



## Install Wordpress and MariaDB with Helm chart



**Install Wordpress and MariaDB**



   Use Helm charts to bootstrap wordpress and mariadb deployment on kubernetes cluster.



```bash

helm repo update

```



Install the chart with release-name,`my-wordpress`



```bash

helm install -f values.yml my-wordpress oci://registry-1.docker.io/bitnamicharts/wordpress

```



After installation, instructions will be printed to stdout.



**Add Wordpress Secrets**

   

We'll add wordpress credentials as a kubernetes secret.



From stdout above, Export the wordpress password to environment variable, `WORDPRESS_PASSWORD`



```bash

export WORDPRESS_PASSWORD=$(kubectl get secret --namespace wordpress my-wordpress -o jsonpath="{.data.wordpress-password}" | base64 -d)

```



Then create secret:



```bash

kubectl create secret generic db-user-pass \

   --from-literal=username=wordpress \

   --from-literal=password=$WORDPRESS_PASSWORD

```



Delete environment variable, to prevent non-admin users viewing it's value.



```bash

unset WORDPRESS_PASSWORD

```



-----



## Connect to Wordpress and MariaDB



**Confirm PVCs are bound**



This confirms the applications installed will have access to persistent storage



```bash

kubectl get pvc -n wordpress

```



Check service created



```bash

kubectl get svc -n wordpress

```



HTTP access to Wordpress pods 



Export IPv4 address and port



```bash

export NODE_PORT=$(kubectl get --namespace wordpress -o jsonpath="{.spec.ports[0].nodePort}" services my-wordpress)

export NODE_IP=$(kubectl get nodes --namespace wordpress -o jsonpath="{.items[0].status.addresses[0].address}")

echo "WordPress URL: http://$NODE_IP:$NODE_PORT/"

echo "WordPress Admin URL: http://$NODE_IP:$NODE_PORT/admin"

```



HTTP request to Wordpress site

```bash

curl http://$NODE_IP:$NODE_PORT/

```



Set up a port forward from the Service to the host on the master node.



```bash

kubectl port-forward — namespace wordpress

```



Set up a port forward from the host machine to the development machine.



```bash

ssh -L 54321:localhost:5432 k8snode-1@ -i /tmp/terraform-key.pem

```



----



## Test Data Persistence



Check pods running

   

Confirm mariadb pods are in 'Ready' state



```bash

kubectl get pods -n wordpress

```



Delete pods



```bash

kubectl delete pod  -n wordpress

```



Restart port forwards

```bash

kubectl port-forward — namespace wordpress

ssh -L 54321:localhost:5432 k8snode-1@ -i ~/.ssh/id_rsa

```



Upon deletion of pod, another instance is automatically scheduled.



You'll still be able to access your database with data still intact.



-----



## Secure Traffic with Let's Encrypt Certificates



The Bitnami WordPress Helm chart includes native support for Ingress routes and certificate management via cert-manager. This simplifies TLS configuration by enabling the use of certificates from various providers, such as Let's Encrypt.



### Install the Nginx Ingress Controller with Helm



Create namespace for ingress controller

Then switch to ingress-nginx namespace



```bash

kubectl create namespace ingress-nginx

kubens ingress-nginx

```



Pull the chart sources:



```bash

helm pull oci://ghcr.io/nginxinc/charts/nginx-ingress --untar --version 1.2.0

```



Change working directory to nginx-ingress:



```bash

cd nginx-ingress

```



Upgrade the CRDs:



```bash

kubectl apply -f crds/

```



Install the chart with the release name, ingress-nginx



```bash

helm install ingress-nginx .

```



Next, check if the Helm installation was successful by running command below:



```bash

helm ls -n ingress-nginx

```



### Configure DNS for Nginx Ingress Controller



Configure `DNS` with a `domain` that you own and create the domain `A` record for the wordpress site.



Next, you will add the required `A` record for the wordpress application.



Please note, you need to identify the load balancer `external IP` created by the `nginx` deployment:



```bash

kubectl get svc -n ingress-nginx

```



### Install Cert-Manager



First, add the `jetstack` Helm repo, and list the available charts:



```bash

helm repo add jetstack https://charts.jetstack.io



helm repo update jetstack

```



Next, install Cert-Manager using Helm:



```bash

helm install cert-manager jetstack/cert-manager --version 1.8.0 \

  --namespace cert-manager \

  --create-namespace \

  --set installCRDs=true

```



Finally, check if Cert-Manager installation was successful by running below command:



```bash

helm ls -n cert-manager

```



The output looks similar to `STATUS` column should print `deployed`:



```text

NAME            NAMESPACE       REVISION        UPDATED                                 STATUS          CHART                   APP VERSION

cert-manager    cert-manager    1               2024-04-08 18:02:08.124264 +0300 EEST   deployed        cert-manager-v1.15.0     v1.15.0

```



### Configure Production Ready TLS Certificates for WordPress



A cluster issuer is required first, in order to obtain the final TLS certificate. Open and inspect the `cluster-manifest/letsencrypt-issuer-values.yaml` file provided in this repository:



```text

apiVersion: cert-manager.io/v1

kind: ClusterIssuer

metadata:

  name: letsencrypt-prod

  namespace: wordpress

spec:

  acme:

    # You must replace this email address with your own.

    # Let's Encrypt will use this to contact you about expiring

    # certificates, and issues related to your account.

    email:  [email protected]

    server: https://acme-v02.api.letsencrypt.org/directory

    privateKeySecretRef:

      # Secret resource used to store the account's private key.

      name: prod-issuer-account-key

    # Add a single challenge solver for Cloudflare

    solvers:

      - dns01:

          cloudflare:

            email: [email protected]

            apiTokenSecretRef:

              name: cloudflare-token-secret

              key: cloudflare-token

        selector:

          dnsZones:

            -   # odennav.com

```



Apply via kubectl:



```bash

cd wordpress-mariadb-helm/

kubectl apply -f cluster-manifest/letsencrypt-issuer-values.yaml

```



Create a certificate for the `wordpress` namespace

```bash

apiVersion: cert-manager.io/v1

kind: Certificate

metadata:

  name: local-odennav-com

  namespace: wordpress

spec:

  secretName: local-odennav-com-tls

  issuerRef:

    name: prod-issuer-acount-key

    kind: ClusterIssuer

  commonName: "*.odennav.com"

  dnsNames:

  - ""      # odennav.com

  - "*."    # *.odennav.com

```



To secure WordPress traffic, open the helm `values.yaml` file in the `cluster-manifest` directory and add the following:



```text

# Enable ingress record generation for WordPress

ingress:

  enabled: true

  certManager: true

  tls:

    secretName: local-odennav-com-tls

  hostname: 

  annotations:

    kubernetes.io/ingress.class: "nginx"

    cert-manager.io/cluster-issuer: "letsencrypt-prod"

  extraTls:

  - hosts:

      - 

```



Upgrade via `helm`:



```bash

helm upgrade my-wordpress bitnami/wordpress \

    --namespace wordpress \

    --version 22.0.0 \

    --timeout 10m0s \

    --values /wordpress-mariadb-helm/cluster-manifest/values.yaml

```



This automatically creates a certificate through cert-manager. You can then verify that you've successfully obtained the certificate by running the following command:



```bash

kubectl get certificate -n wordpress

```



If successful, the output's READY column reads True:



```text

NAME                    READY   SECRET                  AGE

local-odennav-com-tls   True    local-odennav-com-tls   24h

```



Now, you can access WordPress using the domain configured earlier. You will be guided through the `installation` process.



## Enable WordPress Monitoring Metrics



In this section, you will learn how to enable metrics for monitoring your WordPress instance.



First, open the `wordpress-values.yaml` created earlier in this tutorial, and set `metrics.enabled` field to `true`.



```bash

# Prometheus Exporter / Metrics configuration

metrics:

  enabled: true

```



Apply changes using Helm:



```bash

helm upgrade my-wordpress bitnami/wordpress \

    --create-namespace \

    --namespace wordpress \

    --version 22.0.0 \

    --timeout 10m0s \

    --values /wordpress-mariadb-helm/cluster-manifest/values.yaml

```



Next, port-forward the wordpress service to inspect the available metrics:



```bash

kubectl port-forward --namespace wordpress svc/wordpress-metrics 9150:9150

```



Browse to `localhost:9150/metrics` to see all WordPress metrics.



Finally, you need to configure Grafana and Prometheus to visualise metrics exposed by your new WordPress instance.



### Configuring WordPress Plugins



Plugins serve as the foundational components of your WordPress site, enabling crucial functionalities ranging from contact forms and SEO enhancements to site speed optimization, online store creation, and email opt-ins. Whatever your website requirements may be, plugins provide the necessary tools to fulfill them.



Here is a curated list of recommended plugins:



- [LiteSpeed Cache](https://wordpress.org/plugins/litespeed-cache/):  is a comprehensive site acceleration tool, offering an exclusive server-level cache and a suite of optimization features to enhance website performance.



- [Contact Form by WPForms](https://wordpress.org/plugins/wpforms-lite/): enables you to design visually appealing contact forms, feedback forms, subscription forms, payment forms, and various other types of forms for your website.



- [MonsterInsights](https://wordpress.org/plugins/google-analytics-for-wordpress/): is regarded as the premier Google Analytics solution for WordPress. It facilitates seamless integration between your website and Google Analytics, providing detailed insights into how visitors discover and interact with your site.



- [Query Monitor](https://wordpress.org/plugins/query-monitor/): serves as a developer tools panel for WordPress. It allows for debugging of database queries, PHP errors, hooks, and actions.



- [All in One SEO](https://wordpress.org/plugins/all-in-one-seo-pack/): aids in driving more traffic from search engines to your website. While WordPress is inherently SEO-friendly, this plugin empowers you to further enhance your website traffic by implementing SEO best practices.



- [SeedProd](https://wordpress.org/plugins/coming-soon/): This plugin stands out as the premier drag-and-drop page builder for WordPress. It simplifies the process of customizing your website design and crafting unique page layouts effortlessly, eliminating the need for manual code writing.



- [UpdraftPlus](https://wordpress.org/plugins/updraftplus/): Facilitates backups and restoration. Backup your files and database backups into the cloud and restore with a single click.



For more plugins, visit  



### Enhancing Wordpress Performance



Content Delivery Network (CDN) is a straightforward method to accelerate a WordPress website. 



A CDN consists of servers strategically positioned to optimize the delivery of media files, thereby enhancing the loading speed of web pages. 



Many websites encounter latency issues when their visitors are located far from the server location. 



By utilizing a CDN, content delivery can be expedited by relieving the web server of the task of serving static content such as images, CSS, JavaScript, and video streams. 



Additionally, caching static content minimizes latency. Overall, CDN serves as a dependable and effective solution for optimizing websites and enhancing the global user experience.



### Configuring Cloudflare



[Cloudflare](https://www.cloudflare.com/en-gb/) is a renowned provider of content delivery network (CDN), DNS, DDoS protection, and security services. Leveraging Cloudflare can significantly accelerate and bolster the security of your WordPress site, making it an excellent solution for website optimization and protection.



Cloudflare account is required for this configuration. Visit the [Cloudflare website](https://www.cloudflare.com/en-gb/) and signup for a free account.



Below are the steps to configure Cloudflare for your WordPress site:



1. Log in to the Cloudflare dashboard using your account credentials and click on the `+ Add Site` button.



2. Enter your WordPress site's domain and click `Add Site`.



3. Choose the `Free` plan and click `Get Started`.



4. From `Review DNS records` and click `Add record`. Add an `A` record with your desired name and the `IPv4 address` of your cloud provider load balancer. Click `Continue`.



5. Follow instructions to change your domain registrar's nameservers to Cloudflare's nameservers.



6. After updating nameservers, click `Done, check nameservers`.



7. Cloudflare may offer configuration recommendations; you can skip these for now by clicking `Skip recommendations`.



An email will confirm when your site is active on Cloudflare.

Use the Analytics page in your Cloudflare account to monitor web traffic on your WordPress site.



-----



###  Remove Wordpress and MariaDB

   If you're taking the option to remove both applications, implement the following:



**Delete PVC**

   

This removes and unbounds PVC from PV.



```bash

kubectl delete -f pg-pvc.yml 

```



**Delete Namespaces**



```bash

kubectl delete ns wordpress

kubectl delete ns ingress-nginx

```



**Destroy AWS resources**



From your local machine:



```bash

terraform destroy

```



-----



Enjoy!