Conquering the Beast: Bitbucket Data Center in Kubernetes – Shared Home Not Writeable, Mounted Volume Owner is Root

Are you trying to deploy Bitbucket Data Center in a Kubernetes cluster, only to be greeted by the ominous error message “Shared home not writeable, mounted volume owner is root”? Fear not, dear reader, for you have stumbled upon the right article. In this comprehensive guide, we will delve into the causes of this issue, explore the intricacies of Kubernetes and Bitbucket Data Center, and provide a step-by-step solution to get your deployment up and running smoothly.

Understanding the Problem

Before we dive into the solution, it’s essential to understand the underlying causes of this issue. When attempting to deploy Bitbucket Data Center in Kubernetes, you might encounter permission issues due to the way volumes are mounted in the containers. The error message “Shared home not writeable, mounted volume owner is root” suggests that the mounted volume is owned by the root user, and the Bitbucket Data Center container doesn’t have the necessary permissions to write to it.

Kubernetes Volumes and Persistent Volumes

In Kubernetes, volumes are used to persist data across container restarts and deployments. There are several types of volumes, including:

• emptyDir: A simple, ephemeral volume that’s deleted when the pod is removed.
• hostPath: A volume that mounts a directory from the host node’s filesystem.
• persistentVolumeClaim (PVC): A request for storage resources that can be bound to a Persistent Volume (PV).

In the context of Bitbucket Data Center, we need to use a Persistent Volume (PV) to store the application’s data. However, by default, the mounted volume is owned by the root user, which causes permission issues.

Solution Overview

To overcome the “Shared home not writeable, mounted volume owner is root” error, we’ll need to:

1. Create a Persistent Volume (PV) with the correct permissions.
2. Update the Bitbucket Data Center deployment to use the Persistent Volume Claim (PVC).
3. Configure the container’s security context to run as a non-root user.

Step 1: Create a Persistent Volume (PV) with Correct Permissions

Create a YAML file named `pv.yaml` with the following contents:

apiVersion: v1
kind: PersistentVolume
metadata:
  name: bitbucket-data-center-pv
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  local:
    path: /mnt/data
  storageClassName: local-storage

Apply the YAML file to create the PV:

kubectl apply -f pv.yaml

Create a YAML file named `pvc.yaml` with the following contents:

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: bitbucket-data-center-pvc
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 5Gi

Apply the YAML file to create the PVC:

kubectl apply -f pvc.yaml

Step 2: Update the Bitbucket Data Center Deployment

Update the Bitbucket Data Center deployment YAML file (`bitbucket-data-center-deployment.yaml`) to use the PVC:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: bitbucket-data-center
spec:
  replicas: 1
  selector:
    matchLabels:
      app: bitbucket-data-center
  template:
    metadata:
      labels:
        app: bitbucket-data-center
    spec:
      containers:
      - name: bitbucket-data-center
        image: atlassian/bitbucket-data-center:latest
        volumeMounts:
        - name: data
          mountPath: /var/atlassian/bitbucket
      volumes:
      - name: data
        persistentVolumeClaim:
          claimName: bitbucket-data-center-pvc

Apply the updated YAML file to update the deployment:

kubectl apply -f bitbucket-data-center-deployment.yaml

Step 3: Configure the Container’s Security Context

Update the Bitbucket Data Center deployment YAML file to configure the container’s security context:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: bitbucket-data-center
spec:
  replicas: 1
  selector:
    matchLabels:
      app: bitbucket-data-center
  template:
    metadata:
      labels:
        app: bitbucket-data-center
    spec:
      securityContext:
        fsGroup: 1001
      containers:
      - name: bitbucket-data-center
        image: atlassian/bitbucket-data-center:latest
        volumeMounts:
        - name: data
          mountPath: /var/atlassian/bitbucket
      volumes:
      - name: data
        persistentVolumeClaim:
          claimName: bitbucket-data-center-pvc

The `fsGroup` field specifies the group ID that owns the volume. In this case, we’re using `1001`, which is a common group ID for Bitbucket Data Center.

Verification and Troubleshooting

After updating the deployment, verify that the Bitbucket Data Center container is running correctly:

kubectl get pods -l app=bitbucket-data-center

If the container is not running, check the pod’s logs for errors:

kubectl logs -f 

If you encounter any issues, check the following:

• Verify that the PV and PVC are correctly bound.
• Check the permissions of the mounted volume.
• Ensure that the container’s security context is correctly configured.

Error Message	Cause	Solution
“Shared home not writeable, mounted volume owner is root”	Volume mounted with root ownership	Update the PV and PVC to use the correct permissions
“Permission denied” errors	Container running as root user	Configure the container’s security context to run as a non-root user

Conclusion

By following the steps outlined in this article, you should be able to successfully deploy Bitbucket Data Center in a Kubernetes cluster, overcoming the “Shared home not writeable, mounted volume owner is root” error. Remember to carefully configure the Persistent Volume, Persistent Volume Claim, and the container’s security context to ensure a smooth and secure deployment.

If you’re still experiencing issues, don’t hesitate to reach out to the Kubernetes and Bitbucket Data Center communities for further support.

Additional Resources

For more information on deploying Bitbucket Data Center in Kubernetes, we recommend checking out the following resources:

• Atlassian’s official documentation on deploying Bitbucket Data Center in Kubernetes
• Kubernetes documentation on Persistent Volumes and Claims
• Kubernetes best practices for securing containers

Stay tuned for more articles and tutorials on deploying and managing Bitbucket Data Center in Kubernetes!

Frequently Asked Questions

Stuck with Bitbucket Data Center in Kubernetes and getting the “shared home not writeable, mounted volume owner is root” error? We’ve got you covered!