Shulou(Shulou.com)06/01 Report--

Secure mount parameters:

Mount-t nfs-o nosuid,noexec,nodev,rw 192.168.3.188:/data / mnt

1. Test the default shared parameter options for NFS server:

[root@NFSClient /] # mount-t nfs-o nosuid,noexec,nodev,rw 192.168.3.188:/data / mnt

[root@NFSClient mnt] # cat test.sh

Pwd

[root@NFSClient mnt] # chmod + x test.sh

[root@NFSClient mnt] #. / test.sh

Bash:. / test.sh: Permission denied

[root@NFSClient mnt] # sh test.sh

/ mnt

Tip: insufficient permissions are due to the addition of the noexec parameter when mounted above.

This parameter makes the executable file itself unexecutable, which can be executed if you specify the interpreter sh test.sh.

Force uninstall under the mount directory

[root@NFSClient mnt] # umount-lf / mnt

Default mount parameters of NFS Server and NFS Client

[root@NFSServer ~] # cat / var/lib/nfs/etab = = "server

/ data 192.168.3.0 Universe 24 (rw,sync,wdelay,hide,nocrossmnt,secure,root_squash,no_all_squash,no_subtree_check,secure_locks,acl,anonuid=65534,anongid=65534,sec=sys,rw,root_squash,no_all_squash)

[root@NFSClient ~] # grep mnt / proc/mounts = = "client

192.168.3.188:/data/ / mnt nfs4 rw,relatime,vers=4,rsize=131072,wsize=131072,namlen=255,hard,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,clientaddr=192.168.3.200,minorversion=0,local_lock=none,addr=192.168.3.188 00

Rsize,wsize, these two are very important parameters.

Let's test and modify the values of those two parameters to test the speed.

[root@NFSClient ~] # time dd if=/dev/zero of=/mnt/testfile bs=9k count=20000

20000's 0 records in

20000's 0 records out

184320000 bytes (184MB) copied, 17.7761 s, 10.4 MB/s

Real 0m17.834s

User 0m0.017s

Sys 0m8.440s

Parameter suggestion for optimizing mount of NFS network file system

Performance optimization

[root@NFSClient~] # mount-t nfs-o noatime,nodiratime,rsize=131072,wsize=131072 192.168.3.188:/data / mnt

Default settings:

[root@NFSServer ~] # cat / proc/sys/net/core/rmem_default

112640

This file specifies the default value (in bytes) of the receive socket buffer size

[root@NFSServer ~] # cat / proc/sys/net/core/rmem_max

112640

This file specifies the default value (in bytes) of the receive socket buffer size

Add it to this file and take effect permanently. Load configuration sysctl-p

1. Introduction of exportfs command

Exportfs-rv = / etc/init.d/nfs reload load configuration file

[root@NFSServer] # exportfs-o rw,sync 192.168.3.188:/data

[root@NFSServer] # exportfs-o rw,sync,all_squash,anonuid=555,anongid=555 192.168.3.188:/data

This command does not need to configure the file sharing directory

Second, error checking

[root@NFSServer] # rpcinfo-p localhost

Program vers proto port service

100000 4 tcp 111 portmapper

100000 3 tcp 111 portmapper

100011 2 udp 875 rquotad

100011 1 tcp 875 rquotad

100003 2 tcp 2049 nfs

100003 3 tcp 2049 nfs

100003 4 tcp 2049 nfs

100227 2 tcp 2049 nfs_acl

100227 3 tcp 2049 nfs_acl

= "check if nfs has registered a port with rpc

Help from Nfs man exports

Mount-a checks the configuration file fstab for errors

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.