Linux NFS Installation

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• Linux NFS

Relevance

• Updated for Amazon EC2

Server Installation

Install Packages

sudo su -
yum install rpcbind nfs-utils 

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

Setup Security

iptables

Normally, a specific list of ports should be provided to iptables. I tried the following, but it did not work:

...
-A RH-Firewall-1-INPUT -s 192.168.0.0/255.255.0.0 -m state --state NEW -p udp --dport 111 -j ACCEPT
-A RH-Firewall-1-INPUT -s 192.168.0.0/255.255.0.0 -m state --state NEW -p tcp --dport 111 -j ACCEPT
-A RH-Firewall-1-INPUT -s 192.168.0.0/255.255.0.0 -m state --state NEW -p tcp --dport 2049 -j ACCEPT
-A RH-Firewall-1-INPUT -s 192.168.0.0/255.255.0.0  -m state --state NEW -p tcp --dport 32803 -j ACCEPT
-A RH-Firewall-1-INPUT -s 192.168.0.0/255.255.0.0  -m state --state NEW -p udp --dport 32769 -j ACCEPT
-A RH-Firewall-1-INPUT -s 192.168.0.0/255.255.0.0  -m state --state NEW -p tcp --dport 892 -j ACCEPT
-A RH-Firewall-1-INPUT -s 192.168.0.0/255.255.0.0  -m state --state NEW -p udp --dport 892 -j ACCEPT
-A RH-Firewall-1-INPUT -s 192.168.0.0/255.255.0.0  -m state --state NEW -p tcp --dport 875 -j ACCEPT
-A RH-Firewall-1-INPUT -s 192.168.0.0/255.255.0.0  -m state --state NEW -p udp --dport 875 -j ACCEPT
-A RH-Firewall-1-INPUT -s 192.168.0.0/255.255.0.0  -m state --state NEW -p tcp --dport 662 -j ACCEPT
-A RH-Firewall-1-INPUT -s 192.168.0.0/255.255.0.0 -m state --state NEW -p udp --dport 662 -j ACCEPT
-A SSH -s 192.168.0.0/255.255.0.0 -j ACCEPT
...

then

service iptables restart

I ended up allowing everything from 192.168.0.0/255.255.0.0 for the duration of using the NFS.

...
-A RH-Firewall-1-INPUT -s 192.168.0.0/255.255.0.0 -j ACCEPT
...

Amazon EC2

Amazon EC2 NFS Server Security Group

Define the Directories to Share

1. Create the directory:

mkdir /opt/shared

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

service nfs-server start

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

Client Installation

Install Packages

sudo su -
yum install nfs-utils

Mount "on-the-fly"

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

mount -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:

|[fstab]

!!Mount Options

|[NFS#MountOptions]