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While working on ny NFS cluster project , I could not mount my nfs exports from clients ( FreBSD & Centos ).

on the FreeBSD client I got these responses :
[udp] server:/data/dir1: Permission denied
on the CentOS client I got these responses:
mount: server:/data/dir1 failed, reason given by server: Permission denied

On the Centos NFS server the logs showed :
mountd[12377]: authenticated mount request from client1:984 for /data/dir1 (/data/dir1)

Turns out there’s a bug in CentOS and modprobe does not mount the nfsd procs , you can fix the issue by adding :

none /proc/fs/nfsd nfsd auto 0 0

to /etc/fstab
or manually ( if you want to make sure that is the issue ) :

/bin/mount -t nfsd nfsd /proc/fs/nfsd

I am working on building a DRBD cluster and as with all cluster tools , you must have a synced time between nodes.

1. install ntp
yum -y install ntp
2. enable ntp on boot
chkconfig ntpd on
3.run a manual time sync before starting the service
ntpdate 0.pool.ntp.org
4. start the service
service ntpd start

trying to umount an nfs or external disk partition and got “partition busy” ?
use fstat -f to find out what the hold up …

-f Restrict examination to files open in the same file systems as
the named file arguments, or to the file system containing the
current directory if there are no additional filename arguments.
For example, to find all files open in the file system where the
directory /usr/src resides, type ``fstat -f /usr/src''.


follow this link : Dell OMSA 5.5 Linux repository

Install dependency :

sudo yum -y install perl-Net-SSLeay

Get the latest RPM from the Webmin website and install it

wget http://prdownloads.sourceforge.net/webadmin/webmin-1.441-1.noarch.rpm
rpm -ihv webmin-1.441-1.noarch.rpm

open port 10000 in your iptables :

sudo vi /etc/sysconfig/iptables

Add the following line :

-A RH-Firewall-1-INPUT -m state –state NEW -m tcp -p tcp –dport 10000 -j ACCEPT

Reload iptables :

sudo /sbin/service iptables restart

access your webmin install via browser :

https://your server name:10000/

Note: you should probably limit the ip’s that can access your webmin interface , cant be too careful now days…
this can be done by changing the above iptables line and add a “-s subnet or ip” , for example limit access to the 192.168.1.0 subnet only :

-A RH-Firewall-1-INPUT -m state –state NEW -m tcp -p tcp -s 192.168.1.0/24 –dport 10000 -j ACCEPT

and of course reload your iptables again.