How to export a volume over NFS on WEkEO Elasticity

Server configuration

Update your system:

sudo apt update && apt upgrade

Install necessary packages:

sudo apt install nfs-kernel-server

Create a new folder, which will be exported by NFS, e.g.:

sudo mkdir -p /mnt/<name of your folder>

Delete all access restrictions in the folder:

sudo chown -R nobody:nogroup /mnt/<name of your folder>/

You can also replace permisssions of files in the folder with your own preferences.

e.g.

sudo chmod 777 /mnt/<name of your folder>/

Defining access permisions to NFS Server.

In the file /etc/exports add the following line:

/mnt/<name of your folder>  <IP address of allowed client>(rw,sync,no_subtree_check)

where <IP address> is the address of the server allowed to access the folder /mnt/<name of your folder>

e.g.

# /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)

#

/mnt/<name of your folder>  <IP address of NFS server>(rw,sync,no_subtree_check)

You can also share your folder to more IP addresses:

/mnt/<name of your folder>  <IP address 1>(rw,sync,no_subtree_check)
/mnt/<name of your folder>  <IP address 2>(rw,sync,no_subtree_check)
/mnt/<name of your folder>  <IP address 3>(rw,sync,no_subtree_check)

You can also share the folder to all servers in a Subnet (instead of adding every IP address separately) by adding following line to /etc/exports (e.g. servers in 192.168.0.0/24):

/mnt/<name of your folder> 192.168.0.0/24(rw,sync,no_subtree_check)

When the configuration file /etc/exports is saved, invoke the following commands:

sudo exportfs -a
sudo systemctl restart nfs-kernel-server

IT IS NECESSARY TO OPEN THE PORT 2049 IN A SECURITY GROUP!

(The FAQ about opening ports in a security group is available at How can I open new ports for http for my service or instance on WEkEO Elasticity)

Client Configuration

Install required packages:

sudo apt install nfs-common

Mount the NFS folder:

sudo mount <IP address of your NFS server>:/mnt/<name of your folder in NFS server> <name of your folder in Client>/