NFS SERVER:
Configure Ports for rquotd(875/udp; 875/tcp), lockd(32803/tcp; 32769/udp), mountd(892/udp; 892/tcp), statd(10053/udp; 10053/tcp), statd_outgoing(10054/udp; 10054/tcp)
vim /etc/sysconfig/nfs
If desired, disable NFS v3 and NFS v2 suport by editing lines 5 & 6 of /etc/sysconfig/nfs
MOUNTD_NFS_V2="no"
MOUNTD_NFS_V3="no"
Save current Iptables rules for later use
iptables-save > pre-nfs-firewall-rules-server
Flush and check Iptables rules
iptables -F
iptables -L
Stop and Start NFS and related Services in the following sequence
service rpcbind stop
service nfslock stop
service nfs stop
service rpcbind start
service nfslock start
service nfs start
Make sure the configured NFS and its associated ports shows as set before and notedown the port numbers and the OSI layer 4 protcols. The standard port numbers for rpcbind (or portmapper) are 111/udp, 111/tcp and nfs are 2049/udp, 2049/tcp.
rpcinfo -p | sort -k 3
Restore the pre-nfs-firewall-rules now
iptables-restore < pre-nfs-firewall-rules-server
Write iptables rules for NFS server (Note: Loopback adapter has to allowed, else you will see packets dropped and also when you restart nfs service, it will spit ERROR { Starting NFS quotas: Cannot register service: RPC: Timed out rpc.rquotad: unable to register (RQUOTAPROG, RQUOTAVERS, udp). [FAILED] } for rquotad daemon. You can check this by adding a rule with LOG jump target at the bottom of INPUT or OUTPUT chains of filter table)
iptables -P INPUT DROP
iptables -P OUTPUT DROP
iptables -A INPUT -s 192.168.1.0/24 -d 192.168.1.0/24 -p udp -m multiport --dports 10053,111,2049,32769,875,892 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A INPUT -s 192.168.1.0/24 -d 192.168.1.0/24 -p tcp -m multiport --dports 10053,111,2049,32803,875,892 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -s 192.168.1.0/24 -d 192.168.1.0/24 -p udp -m multiport --sports 10053,111,2049,32769,875,892 -m state --state ESTABLISHED -j ACCEPT
iptables -A OUTPUT -s 192.168.1.0/24 -d 192.168.1.0/24 -p tcp -m multiport --sports 10053,111,2049,32803,875,892 -m state --state ESTABLISHED -j ACCEPT
iptables -I INPUT -i lo -d 127.0.0.1 -j ACCEPT
iptables -I OUTPUT -o lo -s 127.0.0.1 -j ACCEPT
iptables -L -n --line-numbers
Configure NFS exports directory
vim /etc/exports
exportfs -av
showmount -e
rpcinfo -p
Stop and Start NFS and related Services in the following sequence
service rpcbind stop
service nfslock stop
service nfs stop
service rpcbind start
service nfslock start
service nfs start
NFS CLIENT:
Save current Iptables rules for later use
iptables-save > pre-nfs-firewall-rules-client
Flush and check Iptables rules
iptables -F
iptables -L
Obtain the firewalled NFS Server ports from the client machine and notedown the port numbers and the OSI layer 4 protcols.
rpcinfo -p 'ip-addr-nfs-server' | sort -k 3
Restore the pre-nfs-firewall-rules now
iptables-restore < pre-nfs-firewall-rules-client
Write iptables rules for NFS client (Note: Loopback adapter has to allowed, else you will see packets dropped and also when you restart nfs service, it will spit ERROR { Starting NFS quotas: Cannot register service: RPC: Timed out rpc.rquotad: unable to register (RQUOTAPROG, RQUOTAVERS, udp). [FAILED] } for rquotad daemon. You can check this by adding a rule with LOG jump target at the bottom of INPUT or OUTPUT chains of filter table)
iptables -P INPUT DROP
iptables -P OUTPUT DROP
iptables -A INPUT -s 192.168.1.0/24 -d 192.168.1.0/24 -p udp -m multiport --sports 10053,111,2049,32769,875,892 -m state --state ESTABLISHED -j ACCEPT
iptables -A INPUT -s 192.168.1.0/24 -d 192.168.1.0/24 -p tcp -m multiport --sports 10053,111,2049,32803,875,892 -m state --state ESTABLISHED -j ACCEPT
iptables -A OUTPUT -s 192.168.1.0/24 -d 192.168.1.0/24 -p udp -m multiport --dports 10053,111,2049,32769,875,892 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -s 192.168.1.0/24 -d 192.168.1.0/24 -p tcp -m multiport --dports 10053,111,2049,32803,875,892 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -I INPUT -i lo -d 127.0.0.1 -j ACCEPT
iptables -I OUTPUT -o lo -s 127.0.0.1 -j ACCEPT
iptables -L -n --line-numbers
Stop and Start NFS and related Services in the following sequence
service rpcbind stop
service nfslock stop
service nfs stop
service rpcbind start
service nfslock start
service nfs start
List NFS Server exports
showmount -e 'ip-addr-nfs-server'
Mount NFS Exports manually (persistent mounts can be configured using /etc/fstab)
mount -t nfs ip-addr-nfs-server:/exported-directory /mount-point -o rw,nfsvers=3
mount -t nfs ip-addr-nfs-server:/exported-directory /mount-point -o rw --> For NFS4 version
Configure autofs, if automounting is preferred for nfs exports and with ldap user home directories (Direct and Indirect Maps can be set)
vim /etc/auto.master -> specify the mount point and map-name (Eg: auto.nfs)
vim /etc/map-name
service autofs stop
service autofs start
Check mounted NFS Exports
df -h -F nfs
mount | grep nfs
List all pseudo root NFS-V4 export directories (NFS Lazy mount)
ls /net/ip-addr-nfs-server
