NFS

NFS - Network File System

We have two Linux servers, each with one Tomcat application server. Both application servers must have access to one folder to up- and download files.

We will create a folder on the first server and enable access through the network on this server for the second server.

Operating System: RedHat Enterprise Linux 7

myAppServer1 - Server

vim /etc/exports
 
systemctl list-units *nfs-server*
# if 0 loaded units, you have to enable and start
 
systemctl enable nfs-server.service
systemctl start nfs-server.service
systemctl list-units *nfs-server*
exportfs -r
exportfs -s

/app/myApp/uploads myAppServer2.mynetwork.net(rw,sync)

myAppServer2 - Client

vim /etc/fstab
vim /etc/auto.master
vim /etc/auto.misc
 
systemctl enable autofs.service
systemctl start autofs.service
 
su tomcat
ls -lisah /app/myApp/uploads

# add:
myAppServer1.mynetwork.net:/app/myApp/uploads   /app/myApp/uploads     nfs     user,timeo=3,bg 0       0

# add:
/misc   /etc/auto.misc  --timeout 0 --negative-timeout 5

# add:
myapp_uploads     -fstype=nfs,bg,timeout=-1,timeo=5,rw,tcp,soft,intr,nosuid myAppServer1.mynetwork.net:/app/myApp/uploads

Test

Reboot both servers and doublecheck that the folder is still available and accessible from both servers.

reboot now
 
su tomcat
ls -lisah /app/myApp/uploads

Open webapplication in your browser on myAppServer1 and upload a file. Test download of the file.
Switch to myAppServer2 and download file.

Open webapplication in your browser on myAppServer2 and upload a file. Test download of the file.
Switch to myAppServer1 and download file.

NFS4 - Update

Please also note this post: NFS4