Linux NFS Installation

External

• https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Storage_Administration_Guide/nfs-serverconfig.html

Internal

• Linux NFS

Relevance

• Updated for Amazon EC2

Server Installation

Install Server Packages

sudo su -
yum install rpcbind nfs-utils 

On some system we also need to install "nfs-utils-lib".

Security Setup

iptables

Add the following rules above the INPUT chain rule that rejects traffic:

-A INPUT -s 172.23.0.0/16 -p udp -m multiport --dports 10053,111,2049,32769,875,892 -m state --state NEW,ESTABLISHED -j ACCEPT
-A INPUT -s 172.23.0.0/16 -p tcp -m multiport --dports 10053,111,2049,32803,875,892 -m state --state NEW,ESTABLISHED -j ACCEPT

where "172.23.0.0/16" should be replaced with the actual subnet value.

For more details on what services are using what ports, see Linux Ports.

A more permissive rule allows everything that comes from the specified subnet.

-A INPUT -s 172.23.0.0/16 -j ACCEPT

Restart iptables for changes to take effect.

systemctl restart iptables

Amazon EC2

Amazon EC2 NFS Server Security Group

Define the Directories to Share

1. Create the directory:

mkdir /opt/shared

If the storage is on a dedicated block device, mount it in /etc/fstab:

/dev/vdb1                                 /nfs                    xfs   defaults        0 0

2. Give it the right permissions that make sense across your entire client set.

3. Share it /etc/exports.

Best if you specify only the subnet that must have access to it:

...
/opt/shared 192.168.0.0/255.255.255.0(rw,sync,no_root_squash,no_subtree_check)
...

More details on export options can be found here:

Linux NFS Configuration - Export Options

Start NFS

RHEL 6

service rpcbind start
service nfs start

RHEL 7

systemctl start nfs-server

Start at Boot

init.d

Also add these to chkconfig if needed on reboot.:

chkconfig --add rpcbind
chkconfig --add nfs
chkconfig --level 2345 rpcbind on
chkconfig --level 2345 nfs on

More details on chkconfig:

chkconfig

systemd

systemctl enable nfs-server.service
systemctl list-unit-files | grep nfs-server

More details on systemd:

systemd

List Filesystems Exported by a NFS Server

exportfs: list filesystems exported by a NFS server

Client Installation

Install Packages

sudo su -
yum install nfs-utils

Security Setup

iptables

iptables should allow outgoing connections.

Authentication against the NFS Server

For context, see:

NFS Concepts - Security

Mount "on-the-fly"

Mount "on-the-fly" the directory from another machine:

mount [-v] -t nfs 192.168.0.145:/shared /mnt/tmp

Mount the directory at boot

In /etc/fstab add:

192.168.1.4:/volume3/test3 /rackstation/test3/ nfs nolock,_netdev,bg 0 0

After mount, the client will report the NFS version, as described below:

f01:/opt/shared on /opt/shared type nfs4 (rw,relatime,vers=4.0,rsize=131072,wsize=131072,namlen=255,hard,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,clientaddr=172.31.21.22,local_lock=none,addr=172.31.20.184,_netdev)

More about fstab:

/etc/fstab

More details on mount options can be found here:

Linux NFS Configuration - Mount Options

List Filesystems Mounted by a NFS Client

mount: list filesystems mounted by a NFS client

NFS Troubleshooting

Linux NFS Troubleshooting