Run Image With A Random User And ReadOnly Root Filesystem

May 23, 2025 by ADMIN 58 views

Introduction

In this article, we will explore the possibility of running a Prestashop application on a secured Kubernetes cluster with specific constraints. These constraints include:

Random User ID: The application should run with a random user ID to ensure that the application does not have elevated privileges.
No Capabilities: The application should not have any capabilities to prevent it from performing any administrative tasks.
Read-Only Root Filesystem: The root filesystem should be read-only to prevent any modifications to the application or its dependencies.

Problem Statement

We are able to change the default listening ports of the Prestashop application by using a ConfigMap to override the ports.conf file. However, we are facing a problem when trying to use an emptyDir volume to store the Apache logs and lock files. The issue is that the Apache process needs to write to the /tmp directory, but using an emptyDir volume on /tmp would delete all scripts.

Possible Solutions

To address this issue, we can consider the following possible solutions:

1. Use Environment Variable to Configure Listening Port of Apache

We can use an environment variable to configure the listening port of Apache instead of hardcoding it in the ports.conf file. This would allow us to change the port without modifying the ports.conf file.

Using Environment Variables

We can use a ConfigMap to set an environment variable that specifies the listening port of Apache. Here is an example of how we can do this:

apiVersion: v1
kind: ConfigMap
metadata:
  name: prestashop-config
data:
  APACHE_PORT: "8080"

We can then use this ConfigMap to set the APACHE_PORT environment variable in our Prestashop deployment:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: prestashop
spec:
  selector:
    matchLabels:
      app: prestashop
  template:
    metadata:
      labels:
        app: prestashop
    spec:
      containers:
      - name: prestashop
        image: prestashop:latest
        env:
        - name: APACHE_PORT
          valueFrom:
            configMapKeyRef:
              name: prestashop-config
              key: APACHE_PORT
        ports:
        - containerPort: 8080

2. Put All Scripts in Another Folder than "/tmp"

Another possible solution is to put all scripts in another folder than /tmp and continue to use /tmp for any writing operations. This would allow us to use an emptyDir volume on /tmp without deleting all scripts.

Using a Separate Folder for Scripts

We can create a separate folder for scripts and use a volume to mount this folder in the Prestashop container. Here is an example of how we can do this:

apiVersion: v1
kind: PersistentVolume
metadata:
  name: script-volume
spec:
  capacity:
    storage: 1Gi
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  local    path: /mnt/script-volume
  nodeAffinity:
    required:
      nodeSelectorTerms:
      - matchExpressions:
        - key: kubernetes.io/hostname
          operator: In
          values:
          - node1

We can then use this PersistentVolume to create a volume that mounts the script folder in the Prestashop container:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: prestashop
spec:
  selector:
    matchLabels:
      app: prestashop
  template:
    metadata:
      labels:
        app: prestashop
    spec:
      containers:
      - name: prestashop
        image: prestashop:latest
        volumeMounts:
        - name: script-volume
          mountPath: /var/www/html/script
        ports:
        - containerPort: 8080
      volumes:
      - name: script-volume
        persistentVolumeClaim:
          claimName: script-pvc

Conclusion

In this article, we explored the possibility of running a Prestashop application on a secured Kubernetes cluster with specific constraints. We discussed two possible solutions to address the issue of using an emptyDir volume on /tmp without deleting all scripts. The first solution involves using an environment variable to configure the listening port of Apache, while the second solution involves putting all scripts in a separate folder than /tmp. We hope that this article has provided valuable insights and solutions to help you run your Prestashop application on a secured Kubernetes cluster.

References

Future Work

Introduction

In our previous article, we explored the possibility of running a Prestashop application on a secured Kubernetes cluster with specific constraints. We discussed two possible solutions to address the issue of using an emptyDir volume on /tmp without deleting all scripts. In this article, we will answer some frequently asked questions (FAQs) related to running Prestashop on a secured Kubernetes cluster.

Q: What are the benefits of running Prestashop on a Kubernetes cluster?

A: Running Prestashop on a Kubernetes cluster provides several benefits, including:

Scalability: Kubernetes allows you to scale your Prestashop application horizontally and vertically, which means you can easily add or remove resources as needed.
High Availability: Kubernetes provides high availability features, such as rolling updates and self-healing, which ensure that your Prestashop application is always available to users.
Security: Kubernetes provides a secure environment for running your Prestashop application, with features such as network policies and secret management.
Easy Deployment: Kubernetes provides a simple and easy way to deploy and manage your Prestashop application, with features such as declarative configuration and automated rollouts.

Q: How do I configure the listening port of Apache in a Kubernetes deployment?

A: You can configure the listening port of Apache in a Kubernetes deployment by using an environment variable. Here is an example of how you can do this:

apiVersion: v1
kind: ConfigMap
metadata:
  name: prestashop-config
data:
  APACHE_PORT: "8080"

You can then use this ConfigMap to set the APACHE_PORT environment variable in your Prestashop deployment:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: prestashop
spec:
  selector:
    matchLabels:
      app: prestashop
  template:
    metadata:
      labels:
        app: prestashop
    spec:
      containers:
      - name: prestashop
        image: prestashop:latest
        env:
        - name: APACHE_PORT
          valueFrom:
            configMapKeyRef:
              name: prestashop-config
              key: APACHE_PORT
        ports:
        - containerPort: 8080

Q: How do I put all scripts in a separate folder than "/tmp" in a Kubernetes deployment?

A: You can put all scripts in a separate folder than "/tmp" in a Kubernetes deployment by using a PersistentVolume. Here is an example of how you can do this:

apiVersion: v1
kind: PersistentVolume
metadata:
  name: script-volume
spec:
  capacity:
    storage: 1Gi
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  local    path: /mnt/script-volume
  nodeAffinity:
    required:
      nodeSelectorTerms:
      - matchExpressions:
        - key: kubernetes.io/hostname
          operator: In
          values:
          - node1

You can then use this Persistent to create a volume that mounts the script folder in the Prestashop container:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: prestashop
spec:
  selector:
    matchLabels:
      app: prestashop
  template:
    metadata:
      labels:
        app: prestashop
    spec:
      containers:
      - name: prestashop
        image: prestashop:latest
        volumeMounts:
        - name: script-volume
          mountPath: /var/www/html/script
        ports:
        - containerPort: 8080
      volumes:
      - name: script-volume
        persistentVolumeClaim:
          claimName: script-pvc

Q: How do I troubleshoot issues with my Prestashop application on a Kubernetes cluster?

A: You can troubleshoot issues with your Prestashop application on a Kubernetes cluster by using the following tools and techniques:

kubectl logs: Use the kubectl logs command to view the logs of your Prestashop container.
kubectl exec: Use the kubectl exec command to execute a command in your Prestashop container.
kubectl describe: Use the kubectl describe command to view the details of your Prestashop deployment.
Kubernetes dashboard: Use the Kubernetes dashboard to view the status of your Prestashop deployment and troubleshoot issues.

Conclusion

In this article, we answered some frequently asked questions (FAQs) related to running Prestashop on a secured Kubernetes cluster. We hope that this article has provided valuable insights and information to help you troubleshoot issues with your Prestashop application on a Kubernetes cluster.

References

Future Work

In the future, we plan to explore other possible solutions to address the issue of using an emptyDir volume on /tmp without deleting all scripts. We also plan to investigate the use of other Kubernetes features, such as Init Containers and Persistent Volumes, to improve the security and reliability of our Prestashop application.

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