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When setting up a Kubernetes cluster, the folder /dockerdata-nfs must be shared between all of the Kubernetes worker nodes. This folder is used as a volume by the ONAP pods to share data, so there can only be one copy.

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On this page we will attempt to do this by setting up an NFS server on the Kubernetes master node VM Master and then mount the exported shared directory on each of the all Kubernetes worker nodes' VMs. 

These instruction where written using VMs created from a ubuntu-16.04-server-cloudimg-amd64-disk1 image.

Any user can be used to run the steps in this page, as all the commands are "sudo".

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On the NFS Server

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VM (Kubernetes Master Node)

The actual /dockerdata-nfs folder will live on the Kubernetes master node VM.   Create the directory as root on the Kubernetes master node VM.Master node which will also be running the NFS server to export this folder.

Set up the /dockerdata-nfs Folder

Choose one of the following to create the /dockerdata-nfs folder on this VM:

#id is ubuntu
sudo mkdir -p /dockerdata-nfs
sudo chmod 777 /dockerdata-nfs

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• create a OpenStack volume
• attach the volume to the Kubernetes master node VM
• mount the attached volume to directory /dockerdata-nfs on the Kubernetes master node VM

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Setup the NFS Server and Export  /dockerdata-nfs Folder

Execute the following commands as ubuntu user.

sudo apt update
sudo apt  install nfs-kernel-server
sudo chmod 777 /export
sudo chmod 777 /export/dockerdata-nfs

sudo vi /etc/exports
# append "the following
/dockerdata-nfs *(rw,no_root_squash,no_subtree_check)"

sudo vi /etc/fstab 
# append "/home/ubuntu/dockerdata-nfs /dockerdata-nfs    none    bind  0  0"

sudo service nfs-kernel-server restart

Mount the  dockerdata-nfs folder on each of the Kubernetes node VMs

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service nfs-kernel-server restart

On the other VMs (Kubernetes Worker Nodes)

Mount the /dockerdata-nfs Folder

On each of the Kubernetes worker nodes, mount the /dockerdata-nfs folder that is being served from the Kubernetes master VM.  . Run the followings as ubuntu user.

sudo apt update
sudo apt install nfs-common -y
sudo mkdir /dockerdata-nfs
sudo chmod 777 /dockerdata-nfs


# Option 1:
sudo mount -t nfs -o proto=tcp,port=2049 <hostname <host|or IP address of k8s master node vm>NFS server>:/dockerdata-nfs /dockerdata-nfs
sudo vi /etc/fstab
# append nfsthe following
<hostname or autoIP address 0of NFS 0server>:/dockerdata-nfs /dockerdata-nfs   nfs    auto  0  0


# Option 2:
sudo vi /etc/fstab
# append "<host|IP of k8s master node vm> the following line.
<hostname or IP address of NFS server>:/dockerdata-nfs /dockerdata-nfs   nfs    auto  0  0"

Tips

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# run the following line
sudo mount -a

Verify it :

Tocuh a file inside /dockerdata-nfs directory on the Kubernetes Master and check to see if the same file is found under /dockerdata-nfs on all Kubernetes worker nodes.

Unmount the share directory

Use the lazy (-l) option on Kubernetes worker nodes to force unmount the mount point.

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