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Install ntop on Red Hat Enterprise Linux / CentOS Linux

nguyenhs | 29 August, 2009 11:10

Download latest ntop

Visit ntop project to grab latest version. You can use wget to grab the same, enter:
# cd /opt # wget http://freshmeat.net/redir/ntop/7279/url_tgz/ntop-3.3.6.tar.gz
Untar tar ball, enter:
# tar -zxvf ntop-3.3.6.tar.gz

Configure and Compile ntop under RHEL

You must have RRDTool installed. You also need to install libpcap, enter:
# yum install libpcap-devel libpcap
Type the following commands to compile and install ntop:
# cd ntop # ./autogen.sh
Just type make to compile ntop:
# make
Just type make install to install ntop:
# make install # make install-data-as

Create ntop user

Type the following command to run ntop as ntop user, enter:
# useradd -M -s /sbin/nologin -r ntop

Setup directory permissions

Next, you need to setup directory permissions, enter:
# chown ntop:root /usr/local/var/ntop/ # chown ntop:ntop /usr/local/share/ntop/

Setup ntop user admin password

Type the following command to set ntop admin password, enter:
# ntop -A
Sample output:

Mon Jul 28 03:38:34 2008  NOTE: Interface merge enabled by default
Mon Jul 28 03:38:34 2008  Initializing gdbm databases

ntop startup - waiting for user response!

Please enter the password for the admin user:
Please enter the password again:
Mon Jul 28 03:38:42 2008  Admin user password has been set

Start ntop

Type the following command to start ntop:
# /usr/local/bin/ntop -d -L -u ntop -P /usr/local/var/ntop --skip-version-check --use-syslog=daemon
Sample output:

Mon Jul 28 03:42:19 2008  NOTE: Interface merge enabled by default
Mon Jul 28 03:42:19 2008  Initializing gdbm databases

If you have multiple interface (eth0, eth1 and so on), start ntop as follows:
# /usr/local/bin/ntop -i "eth0,eth1" -d -L -u ntop -P /usr/local/var/ntop --skip-version-check --use-syslog=daemon
Where,

-i "eth0,eth1" : Specifies the network interface or interfaces to be used by ntop for network monitoring. Here you are monitoring eth0 and eth1.
-d : Run ntop as a daemon.
-L : Send all log messages to the system log (/var/log/messages) instead of screen.
-u ntop : Start ntop as ntop user
-P /usr/local/var/ntop : Specify where ntop stores database files. You may need to backup database as part of your disaster recovery program.
--skip-version-check : By default, ntop accesses a remote file to periodically check if the most current version is running. This option disables that check.
--use-syslog=daemon : Use syslog daemon.

How do I view ntop stats?

By default ntop listen on 3000 port. You can view ntop stats by visiting following url:
http://localhost:3000/
OR
http://server-ip:3000/

Hướng dẫn cài đặt VNC Server trên CentOS

nguyenhs | 18 August, 2009 14:57

Bước 1 : Cài X Windows System (KDE và GNOME Desktop Environement !)

Kiểm tra xem svr đã cài gói này chưa bằng cách dùng lệnh :

Code - [#]

yum grouplist

Nếu chưa thấy trong mục Installed thì tiến hành cài !

Để cài GNOME Desktop Environnement chạy lệnh :

Code - [#]

yum groupinstall "X Window System" "GNOME Desktop Environment"

Nếu thấy như đoạn dưới đây là thành công :

Code - [#]

Installed: NetworkManager-gnome.x86_64 0:0.3.1-5.el4 file-roller.x86_64 0:2.8.1-1 gconf-editor.x86_64 0:2.8.0-2 gedit.x86_64 1:2.8.1-4 ggv.x86_64 0:2.8.0-1 gimp-print-utils.x86_64 0:4.2.7-2 gnopernicus.x86_64 0:0.9.12-1 gok.x86_64 0:0.11.8-1 gpdf.x86_64 0:2.8.2-7.7.2.el4_7.4 gtk-engines.x86_64 1:0.12-6.el4 gtk-engines.i386 1:0.12-6.el4 gtk2-engines.i386 0:2.2.0-7.el4 hwbrowser.noarch 0:0.19-0.EL4.4 nautilus-media.x86_64 0:0.8.1-3 vino.x86_64 0:2.8.1-1.5 yelp.x86_64 0:2.6.4-2
Dependency Installed: gimp-print.x86_64 0:4.2.7-2 gtk+.i386 1:1.2.10-36 gtksourceview.x86_64 0:1.1.0-4 imlib.i386 1:1.9.13-23 libungif.i386 0:4.1.3-1.el4.2 pyparted.x86_64 0:1.6.8-2
Complete!

Sau khi cài đặt xong GNOME Desktop Environnement,chúng ta chuyển qua KDE chạy lệnh :

Code - [#]

yum groupinstall "X Window System" "GNOME Desktop Environment"

Cài đặt tương tự như GNOME , cũng hỏi y/n chọn y,rồi ngồi đợi
Cái này chắc ko phải nói nhiều ^_^ !

Bước 2 : Cài đặt VNC Server :

Dùng lệnh :

Code - [#]

yum install vnc-server

Đợi nó cài :

Nếu được như đoạn dưới đây bạn đã cài xong vnc server :

Code - [#]

[root@vps1161 ~]# yum install vnc-server
Loading "priorities" plugin
Loading "fastestmirror" plugin
Setting up Install Process
Setting up repositories
update                    100% |=========================|  951 B    00:00
base                      100% |=========================| 1.1 kB    00:00
contrib                   100% |=========================|  951 B    00:00
centosplus                100% |=========================|  951 B    00:00
addons                    100% |=========================|  951 B    00:00
extras                    100% |=========================| 1.1 kB    00:00
Loading mirror speeds from cached hostfile
Reading repository metadata in from local files
Excluding Packages in global exclude list
Finished
0 packages excluded due to repository priority protections
Parsing package install arguments
Nothing to do

Bước 3 : Hiệu chỉnh config của VNC Server

Bây h chúng ta edit file config của vnc server,chạy lệnh :

Code - [#]

vi /etc/sysconfig/vncservers

Các bạn nào chưa biết sử dụng lệnh vi trong SSH thì mình xin hướng dẫn qua luôn 1 số lệnh cơ bản
Sau khi chạy lệnh

Code - [#]

vi /etc/sysconfig/vncservers

Các bạn sửa nội dung file config vncserver như sau:
Bỏ 2 dấu # ở 2 câu cuối cùng :

Code - [#]

# The VNCSERVERS variable is a list of display:user pairs.
#
# Uncomment the lines below to start a VNC server on display :2
# as my 'myusername' (adjust this to your own). You will also
# need to set a VNC password; run 'man vncpasswd' to see how
# to do that.
#
# DO NOT RUN THIS SERVICE if your local area network is
# untrusted! For a secure way of using VNC, see
# <URL:http://www.uk.research.att.com/archive/vnc/sshvnc.html>.

# Use "-nolisten tcp" to prevent X connections to your VNC server via TCP.

# Use "-nohttpd" to prevent web-based VNC clients connecting.

# Use "-localhost" to prevent remote VNC clients connecting except when
# doing so through a secure tunnel. See the "-via" option in the
# `man vncviewer' manual page.

VNCSERVERS="1:root"
VNCSERVERARGS[1]="-geometry 800x600"

ESC để thoát Insert Mode,rồi dùng lệnh :wq,để save file đó lại và trở về command của SSH !

Bước 4 : Khởi động VNC Server :

Code - [#]

vncserver

Nếu nó đòi pass thì bạn nhập pass vào,pass này sẽ để bạn dùng VNC CLient connect tới svr !

Bước 4 : Sửa file xstartup

Code - [#]

vi /root/.vnc/xstartup

Bỏ 2 dấu thăngs ở 2 đoạn như code dưới :

Code - [#]

unset SESSION_MANAGER
 exec /etc/X11/xinit/xinitrc

Code - [#]

#!/bin/sh

# Uncomment the following two lines for normal desktop:
unset SESSION_MANAGER
exec /etc/X11/xinit/xinitrc

[ -x /etc/vnc/xstartup ] && exec /etc/vnc/xstartup
[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
xsetroot -solid grey
vncconfig -iconic &
xterm -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &
twm &

Bước 5 : Khởi động lại vnc server :

Code - [#]

/etc/init.d/vncserver restart

Bước 6 : Khởi động khi bật máy

Code - [#]

chkconfig vncserver on

Bước 7 : Tắt firewall

Code - [#]

/etc/init.d/iptables stop

Bước 8 : Tắt firewall khi bật máy

Code - [#]

chkconfig iptables off

Bước 9 : Download VNC CLient về và chén thôi

Code - [#]

http://www.stanford.edu/class/ee108b/tools/vncviewer.exe

Bật VNC Client , nhập IP SVR theo dạng
IP:1 hoac IP:2 do bạnconfig trong files /etc/sysconfig/vncservers

Install ntop on Red Hat Enterprise Linux / CentOS Linux

Download latest ntop

Configure and Compile ntop under RHEL

Create ntop user

Setup directory permissions

Setup ntop user admin password

Start ntop

How do I view ntop stats?

Hướng dẫn cài đặt VNC Server trên CentOS

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