nfs warning: mount version older than kernel

or you can not mount nfs, when yo try mount nfs, you recieve error:
root@bacula ~]# mount 10.119.238.100:/VOLUME1/BACULA/ /smartstor
mount: wrong fs type, bad option, bad superblock on 10.119.238.100:/VOLUME1/BACULA/,
missing codepage or other error
In some cases useful info is found in syslog - try
dmesg | tail or so


first, you must install nfs service
yum install nfs-utils
check it included portmap
/etc/rc.d/init.d/portmap start
then retry mount.

Caching-Nameserver

Caching-Nameserver is a type of nameserver that will resolve a web addresses (domain names) from its next or master DNS, and will keep those entries in cache, after first time resolution it will resolve DNS queries locally, untill its TTL (Time To Live) is expired.
BIND 9 is used to resolve domain resolution queries from it own database, as it is SOA (Start Of Authority).
So now it is clear that in our setup the caching-nameserver will be used to resolve domain names externally (internet), while BIND 9 will be used to resolve domain names from our local network (internally).

install packages
yum -y install bind bind-chroot caching-nameserver

start service
service named restart

set autostart
chkconfig named on