Showing posts from March, 2012

Increase the Swap space in Linux

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 bytes (537 MB) copied, 3.79122 s, 142 MB/s
[root@den ]# mkswap /swap_fi…

How to install Php,Mysql and Lighttpd on Ubuntu

Install ntop on RedHat Or CentOs 5

Install rpmforge repository:  


·         i386

·         x86_64

Install DAG's GPG key

rpm --import

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

daemon $prog @/etc/ntop.conf -d -L

first time you start ntop you need to set the admin password:

ntop @/etc/ntop.conf

you should now be able to start ntop deamon via:

service ntop start

if you want …