expand /

Hi

Is it possible to add some extra space on / and how?

Code:

[root@server 05-09-2015]# df -h
Filesystem  Size  Used Avail Use% Mounted on
rootfs  20G  19G  0 100% /
devtmpfs  7.8G  180K  7.8G  1% /dev
tmpfs  7.8G  0  7.8G  0% /dev/shm
/dev/sda2  20G  19G  0 100% /
/dev/sda3  1.8T  250G  1.5T  15% /home
tmpfs  7.8G  28K  7.8G  1% /tmp
/dev/sda2  20G  19G  0 100% /var/named/chroot/etc/named
/dev/sda2  20G  19G  0 100% /var/named/chroot/var/named
/dev/sda2  20G  19G  0 100% /var/named/chroot/etc/named.conf
/dev/sda2  20G  19G  0 100% /var/named/chroot/etc/named.rfc1912.zones
/dev/sda2  20G  19G  0 100% /var/named/chroot/etc/rndc.key
/dev/sda2  20G  19G  0 100% /var/named/chroot/usr/lib64/bind
/dev/sda2  20G  19G  0 100% /var/named/chroot/etc/named.iscdlv.key
/dev/sda2  20G  19G  0 100% /var/named/chroot/etc/named.root.key

Thanks

---

 

It is a kimsufi server with CentOS release 6.7....