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Gluster FS shared volumes for Kubernetes Cluster

Posted March 14, 2019 5.2k views
CentOSKubernetes

Hi,

Right now i am Testing DO Kubernetes and am starting to get my head around it.
There is only one thing that i am missing. An easy way to add shared volumes between PODS.

I tried GlusterFS since I am Familiar with it and Kubernetes has build in support for it, but so fare i Failed to get it working.

The GlusterFS is fine but I get an Error when I try to mound it.

“All subvolumes are down. Going offline until atleast one of them comes back up. The message "E [MSGID: 101075] [common-utils.c:294:gfresolveip6] 0-resolver: getaddrinfo failed (Name or service not known)”

I have read that Rook.io would be a alternative solution but am still hesitant.

Is there a way to use Gluster FS on DO Kubernetes ore are there any other solutions for my need Kind regards.

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gradlon
By:
gradlon

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4 answers
gradlon March 25, 2019

For all those of you wondering.
I found the Solution.
One caveat, the endpoint has to be in the same namespace as the pod Consuming it.

  1. Create a Service for Gluster

    ---
apiVersion: v1
kind: Service
metadata:
name: glusterfs-cluster
namespace: global-storage
spec:
ports:
- port: 1

  2. Create endpoint for your Service

    ---
apiVersion: v1
kind: Endpoints
metadata:
name: glusterfs-cluster
namespace: default
subsets:
- addresses:
  - ip: 10.135.112.37
ports:
  - port: 1
- addresses:
  - ip: 10.135.53.65
ports:
  - port: 1
- addresses:
  - ip: 10.135.26.91
ports:
  - port: 1

  3. Consume Shared Volume

    ---
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-deployment
namespace: default
labels:
app: nginx
spec:
replicas: 1
selector:
matchLabels:
  app: nginx
template:
metadata:
  labels:
    app: nginx
spec:
  containers:
  - name: nginx
    image: nginx:1.15.4
    ports:
    - containerPort: 80
    volumeMounts:
    - mountPath: /usr/share/nginx/html
      name: nfs-vol
    - mountPath: /data
      name: glusterfsvol
  volumes:
  - name: nfs-vol
    nfs:
      server: glusterfs.cloud.integral-systems.ch
      path: /globalshare
  - name: glusterfsvol
    glusterfs:
      endpoints: glusterfs-cluster
      path: globalshare
      readOnly: false

Hope this helps :)

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milos1995 March 15, 2019

GlusterFS Native Storage Service for Kubernetes. gluster-kubernetes is a project to provide Kubernetes administrators a mechanism to easily deploy GlusterFS as a native storage service onto an existing Kubernetes cluster shareit apk.

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liveb4buy May 15, 2019

@gradlon , Still its not working for me with the equivalent code (considering different namespace not default namespace) . Did you configure StorageClass or Init-Container in the Deployment level?
Pls let me know . Thanks in advance.

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filiw January 7, 2021

When applying this test configuration:

---
apiVersion: v1
kind: Service
metadata:
  name: glusterfs-cluster
  namespace: default
spec:
  ports:
    - port: 1

---
apiVersion: v1
kind: Endpoints
metadata:
  name: glusterfs-cluster
  namespace: default
subsets:
  - addresses:
      - ip: 10.x.x.x # IP of a droplet running glusterfs server
    ports:
      - port: 1

---
apiVersion: v1
kind: Pod
metadata:
  name: glusterfs
spec:
  containers:
    - name: glusterfs
      image: nginx
      volumeMounts:
        - mountPath: "/mnt/user/test"
          name: glusterfsvol
  volumes:
    - name: glusterfsvol
      glusterfs:
        endpoints: glusterfs-cluster
        path: test
        readOnly: false

I get the following error:

mount: /var/lib/kubelet/pods/some-uuid/volumes/kubernetes.io~glusterfs/glusterfsvol: unknown filesystem type 'glusterfs'.

It looks like the kubernetes worker nodes don’t have glusterfs-client installed, henceforth the glusterfs mount type is non-existent.

Did anyone solve this yet?

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