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Add a Swap Partition: you have created a partition say /dev/sda7 having size 1GB. [root@den ]# mkswap /dev/sda7 Setting up swapspace version 1, size = 1057092 KiB no label, UUID=5ad400b1-3a7f-449c-9605-c257e56ba381   [root@den ]# free total used free shared buffers cached Mem: 3040320 467800 2572520 0 28032 255368 -/+ buffers/cache: 184400 2855920 Swap: 4289312 0 4289312 The free command above shows around 4GB of swap space. Now lets activate the swap partition. [root@den ]# swapon /dev/sda7  [root@den ]# free total used free shared buffers cached Mem: 3040320 659016 2381304 0 29296 328196 -/+ buffers/cache: 301524 2738796 Swap: 5346400 0 5346400 Notice that the free memory space rose to around 5GB To make the changes permanent you can put an entry in the /etc/fstab file as /dev/sda7 swap swap defaults 0 0 Add a Swap File:  [root@den ]# dd if=/dev/zero of=/swap_file bs=1024 count=524288 524288+0 records in 524288+0 records out 536870912 b

Install rpmforge repository: http://wiki.centos.org/AdditionalResources/Repositories/RPMForge   Or ·         i386 http://packages.sw.be/rpmforge-release/rpmforge-release-0.5.2-2.el5.rf.i386.rpm ·         x86_64 http://packages.sw.be/rpmforge-release/rpmforge-release-0.5.2-2.el5.rf.x86_64.rpm Install DAG's GPG key rpm --import http://apt.sw.be/RPM-GPG-KEY.dag.txt Verify the package you have downloaded rpm -K rpmforge-release-0.5.2-2.el5.rf.*.rpm Install the package rpm -i rpmforge-release-0.5.2-2.el5.rf.*.rpm Installing Ntop : There is an ntop rpm in the rpmforge repository: yum install ntop There is a bug in the /etc/init.d/ntop startscript we need to fix. Open the file in your favorite editor for example vim: vim /etc/init.d/ntop change the line at start function from: daemon $prog -d -L @/etc/ntop.conf to: daemon $prog @/etc/ntop.conf -d -L