Network File System (NFS)¶
Install NFS on client server¶
You can install NFS on a RPM-based server with the following command:
yum install nfs-utils nfs-utils-lib
You can install NFS on an Ubuntu server with the following command:
apt install nfs-common
Distributed Files / Folders¶
It’s very important to only use NFS for files / folder which need to be distributed between multiple servers. We strongly advise against having the entire document root of your website on NFS.
Direct Mount Point¶
You can directly mount NFS to the folder within your document root:
NFSSERVER/nfsshare/media -> /var/www/vhosts/domain.com/htdocs/media
You can do this with the following entry in /etc/fstab:
cat /etc/fstab | grep -i nfs
NFSSERVER:/nfsshare/media /var/www/vhosts/domain.com/htdocs/media nfs rw,noatime,nodiratime,async,timeo=1800 0 0
mount /var/www/vhosts/domain.com/htdocs/media
Symbolic Links¶
You can use Symbolic Links (symlinks) to link files / folders from your document root to the NFS mount point.
ln -s /var/www/vhosts/domain.com/htdocs/media /nfsshare/media
Open File Check¶
You can see all the NFS open files with the following command:
lsof -N
Write Speed Test¶
Using the dd command you can write a file to the local file system and then to the NFS mount point to then compare the speed results. The write speeds over NFS should always be slower
Local File System¶
dd if=/dev/zero of=/root/testfile bs=1G count=1 oflag=direct
1073741824 bytes (1.1 GB) copied, 1.12829 s, 952 MB/s
rm -f /root/testfile
NFS Mount Point¶
This write speed test creates the file /nfsshare/testfile with NFS being mounted to /nfsshare/
dd if=/dev/zero of=/nfsshare/testfile bs=1G count=1 oflag=direct
1073741824 bytes (1.1 GB) copied, 1.82611 s, 588 MB/s
rm -f /nfsshare/testfile