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Tip

You can skip step if your kubernetes deployment in on a single VM or physical system.

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


Table of Contents

Create

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NFS Server and export  /dockerdata-nfs on Kubernetes master VM

The actual /dockerdata-nfs folder will live on the kubernetes master VM.   

In our environment we provision an Openstack volume to allocate more space instead of instead of using the VM default backing store. 

This is an optional and can be skipped.  Create an Openstack Volume


The following script can be used to setup the NFS server on the  kubernetes master VM

Code Block
languagebash
titlenfs server
sudo apt update
sudo apt  install nfs-kernel-server
mkdir ~/dockerdata-nfs
sudo mkdir -p /export/dockerdata-nfs
sudo chmod 777 /export
sudo chmod 777 /export/dockerdata-nfs

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


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

sudo service nfs-kernel-server restart




Mount the Volume to Other VM Instances

Warning
titleWork in progress

More investigatio needed (as part of multi-nodes kubernetes cluser) as I'm having "Operation not permitted" error in sdnc-dbhost pod when deploying SDN-C cluster with the mounted /dockerdata-nfs from this instruction:

ubuntu@sdnc-k8s:~/oom/kubernetes/oneclick$ kubectl logs sdnc-dbhost-3029711096-w1szw -n onap-sdnc

[Entrypoint] MySQL Docker Image 5.6.38-1.1.2

chown: changing ownership of '/var/lib/mysql/': Operation not permitted

ubuntu@sdnc-k8s:~/oom/kubernetes/oneclick$ kubectl logs consul-agent-3312409084-3560z -n onap-consul

chown: /consul/config: Operation not permitted

ubuntu@sdnc-k8s:~/oom/kubernetes/oneclick$ 

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#PurposeCommand and Example
1

On the server of the attached VM instance


1.1

Install exportfs

if exportfs is not installed, install it with the following command:

sudo apt install nfs-kernel-server

Expand
titleExample of installing exportfs

ubuntu@sdnc-k8s:~/oom/kubernetes/oneclick$ sudo apt install nfs-kernel-server

Reading package lists... Done

Building dependency tree

Reading state information... Done

The following additional packages will be installed:

  keyutils libnfsidmap2 libpython-stdlib libpython2.7-minimal libpython2.7-stdlib libtirpc1 nfs-common python python-minimal python2.7 python2.7-minimal rpcbind

Suggested packages:

  watchdog python-doc python-tk python2.7-doc binutils binfmt-support

The following NEW packages will be installed:

  keyutils libnfsidmap2 libpython-stdlib libpython2.7-minimal libpython2.7-stdlib libtirpc1 nfs-common nfs-kernel-server python python-minimal python2.7 python2.7-minimal rpcbind

0 upgraded, 13 newly installed, 0 to remove and 27 not upgraded.

Need to get 4,383 kB of archives.

After this operation, 18.5 MB of additional disk space will be used.

Do you want to continue? [Y/n] Y

…

Replacing config file /etc/exports with new version


Creating config file /etc/default/nfs-kernel-server with new version

Processing triggers for libc-bin (2.23-0ubuntu9) ...

Processing triggers for systemd (229-4ubuntu19) ...

Processing triggers for ureadahead (0.100.0-19) ...

ubuntu@sdnc-k8s:~/oom/kubernetes/oneclick$ 

1.2

Modify /etc/exports file to export the /dockerdata-nfs mount point

Expand
titleExample of /etc/exports for /dockerdata-nfs export mount point

ubuntu@sdnc-k8s:~$ more /etc/exports
# /etc/exports: the access control list for filesystems which may be exported
# to NFS clients. See exports(5).
#
# Example for NFSv2 and NFSv3:
# /srv/homes hostname1(rw,sync,no_subtree_check) hostname2(ro,sync,no_subtree_check)
#
# Example for NFSv4:
# /srv/nfs4 gss/krb5i(rw,sync,fsid=0,crossmnt,no_subtree_check)
# /srv/nfs4/homes gss/krb5i(rw,sync,no_subtree_check)
#
/dockerdata-nfs sdnc-k8s-2(rw,sync,no_subtree_check)

1.3 

Export the /dockerdata-nfs mount point 

 sudo exportfs -rav


Expand
titleExample of exportfs command output

exporting sdnc-k8s:/dockerdata-nfs

2 

On the server of the other VM instance


2.1

 Install nfs-common

sudo apt install nfs-common

2.2

Mount the volume as the /dockerdata-nfs directory

sudo mkdir -p /dockerdata-nfs

sudo mount <mount point server IP>:/dockerdata-nfs /dockerdata-nfs

2.3

Validate the mount

Expand
titleExample of using df command to validate

ubuntu@sdnc-k8s-2:~$ df

Filesystem                    1K-blocks    Used Available Use% Mounted on

udev                            8209144       0   8209144   0% /dev

tmpfs                           1643244    9804   1633440   1% /run

/dev/vda1                      20263528 9778736  10468408  49% /

tmpfs                           8216216    2460   8213756   1% /dev/shm

tmpfs                              5120       0      5120   0% /run/lock

tmpfs                           8216216       0   8216216   0% /sys/fs/cgroup

tmpfs                           1643244       0   1643244   0% /run/user/1000

10.147.132.10:/dockerdata-nfs 103081984   61440  97761280   1% /dockerdata-nfs



Tips

unmount

Use the lazy (-l) option to force unmount the mount point.

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