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Deploy PHP application with Kubernetes on Ubuntu

by | Feb 21, 2021

Are you looking for steps to deploy the PHP application with Kubernetes on Ubuntu? We can help you with it.

Here at Bobcares, we have seen several such Kubernetes-related queries as part of our DigitalOcean Managed Services.

Today we’ll take a look at how to deploy the PHP application with Kubernetes on Ubuntu.

 

How to deploy PHP application Kubernetes ubuntu

Now let’s take a look at how our Support Engineers deploy the PHP with Kubernetes.

 

Step 1: Creating the PHP-FPM and Nginx Services

First, we shall create the PHP-FPM and Nginx services. The PHP-FPM service will allow access to the PHP-FPM pods whereas the Nginx service will allow access to the Nginx pods.

In order to create a service, we need to create an object definition file.

For that, we SSH to master node and create definitions directory that will hold your Kubernetes object definitions.

$ mkdir definitions

Then we navigate to the newly-created directory.

$ cd definitions

To make a PHP-FPM service, we create a php_service.yaml file:

$ nano php_service.yaml

Here is the code that we will be adding to the php_service.yaml file where we set kind as Service to specify that this object is a service. Also, we name the service php since it will provide access to PHP-FPM.

After adding the code, we hit CTRL + O to save the file, and then CTRL + X to exit nano. Then we create service by running the below command.

$ kubectl apply -f php_service.yaml

We run the below command to verify if the service is running or not.

$ kubectl get svc

Now, we have PHP-FPM service ready. So, we can now move to create Nginx service. For that, we create and open a new file called nginx_service.yaml with the editor:

$ nano nginx_service.yaml

We add the below code in nginx_service.yaml file.

apiVersion: v1
kind: Service
metadata:
name: nginx
labels:
tier: backend
spec:
selector:
app: nginx
tier: backend
ports:
- protocol: TCP
port: 80
externalIPs:
- your_public_ip

Then we save and close the file. Here is the command that we run to create the Nginx service:

$ kubectl apply -f nginx_service.yaml

 

Step 2: Installing the DigitalOcean Storage Plug-In to deploy the PHP application

Here, we shall first configure a Kubernetes Secret object to store the DigitalOcean API token. Using these secret objects, we can share sensitive information, like SSH keys and passwords, with other Kubernetes objects within the same namespace.

So, we open a file named secret.yaml with the editor:

$ nano secret.yaml

Then we add the below code in it.

apiVersion: v1
kind: Secret
metadata:
name: digitalocean
namespace: kube-system
stringData:
access-token: your-api-token

Then we create a secret

$ kubectl apply -f secret.yaml

Here is the command that we run to view the secret object.

$ kubectl -n kube-system get secret digitalocean

Once we have our Secret in place, we can now install the DigitalOcean block storage plug-in:

$ kubectl apply -f https://raw.githubusercontent.com/digitalocean/csi-digitalocean/master/deploy/kubernetes/releases/csi-digitalocean-v1.1.0.yaml

 

Step 3: Creating the Persistent Volume with Kubernetes on Ubuntu

We can access the Persistent Volume using a PersistentVolumeClaim, or PVC, which mounts the PV at the required path.

We first, open a file named code_volume.yaml.

$ nano code_volume.yaml

Then we add the below code in it:

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: code
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 1Gi
storageClassName: do-block-storage

Then we save and exit the file.

After that, we create the code PVC using kubectl:

$ kubectl apply -f code_volume.yaml

 

Step 4: Creating a PHP-FPM application Deployment

In order to create a deployment, we create a file named php_deployment.yaml

$ nano php_deployment.yaml

Then we add the below code in it.

apiVersion: apps/v1
kind: Deployment
metadata:
name: php
labels:
tier: backend
spec:
replicas: 1
selector:
matchLabels:
app: php
tier: backend
template:
metadata:
labels:
app: php
tier: backend
spec:
volumes:
- name: code
persistentVolumeClaim:
claimName: code
containers:
- name: php
image: php:7-fpm
volumeMounts:
- name: code
mountPath: /code
initContainers:
- name: install
image: busybox
volumeMounts:
- name: code
mountPath: /code
command:
- wget
- "-O"
- "/code/index.php"
- https://raw.githubusercontent.com/do-community/php-kubernetes/master/index.php

We then save the file and exit it.

After that, we create the PHP-FPM Deployment with kubectl:

$ kubectl apply -f php_deployment.yaml

Here is the command that we run to view the Deployment.

$ kubectl get deployments

To view the pods that this Deployment started with, we run the following command:

$ kubectl get pods

 

Step 5: Creating the Nginx Deployment on Ubuntu to deploy a PHP application

Now, we shall use a ConfigMap to configure Nginx. ConfigMap will hold the configuration in a key-value format that we reference in other Kubernetes object definitions.

We create a nginx_configMap.yaml file for your ConfigMap with your editor:

$ nano nginx_configMap.yaml

Then we add the below code in it:

apiVersion: v1
kind: ConfigMap
metadata:
name: nginx-config
labels:
tier: backend
data:
config : |
server {
index index.php index.html;
error_log /var/log/nginx/error.log;
access_log /var/log/nginx/access.log;
root /code;

location / {
try_files $uri $uri/ /index.php?$query_string;
}

location ~ \.php$ {
try_files $uri =404;
fastcgi_split_path_info ^(.+\.php)(/.+)$;
fastcgi_pass php:9000;
fastcgi_index index.php;
include fastcgi_params;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
fastcgi_param PATH_INFO $fastcgi_path_info;
}
}

We save the file and exit it.

Then we create the ConfigMap:

$ kubectl apply -f nginx_configMap.yaml

Now we are done creating the ConfigMap and now we can build the Nginx Deployment.

We start by opening a new nginx_deployment.yaml file in the editor:

$ nano nginx_deployment.yaml

Here is the code that we add:

apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx
labels:
tier: backend
spec:
replicas: 1
selector:
matchLabels:
app: nginx
tier: backend
template:
metadata:
labels:
app: nginx
tier: backend
spec:
volumes:
- name: code
persistentVolumeClaim:
claimName: code
- name: config
configMap:
name: nginx-config
items:
- key: config
path: site.conf
containers:
- name: nginx
image: nginx:1.7.9
ports:
- containerPort: 80
volumeMounts:
- name: code
mountPath: /code
- name: config
mountPath: /etc/nginx/conf.d

We save the file and exit the editor.

Now, we shall create the Nginx Deployment:

$ kubectl apply -f nginx_deployment.yaml

We can list the Deployments with this command:

$ kubectl get deployments

Here is the command that we run to list the pods managed by both of the Deployments:

$ kubectl get pods

Now we have all of the Kubernetes objects are active. So we can visit the Nginx service on the browser.

We run the below command to list the running services:

$ kubectl get services -o wide

Here, we get the External IP for our Nginx service.

On the browser, we can visit the server by typing in http://your_public_ip. We can see the output of php_info() and have confirmed that the Kubernetes services are up and running.

[Need any further assistance with DigitalOcean queries? We can help you with it]

 

Conclusion

Today, we saw how our Support Engineers deploy PHP application with Kubernetes on Ubuntu

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