Showing posts with label Monitoring. Show all posts
Showing posts with label Monitoring. Show all posts

Looking for a free server load monitoring utility which will email you about the load on the server on a frequent interval ?

Posted by Unknown at 17:16 0 comments
CRONJOB is the Answer …..

create a cronjob from the uptime command if thats all you need.

crontab -e
* */1 * * * (cd /usr/bin; ./uptime 2>&1 | mail -s “System load” your.email.com)

The above example will email the load and uptime to you every hour. “System load” is the email subject and of course change your email to your real address.

You can mail yourself a report the same way with any command you like such as netstat, ps and top or anything you like.
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Monitoring Bandwidth Usage - iftop

Posted by Unknown at 21:32 0 comments
iftop does for network usage what top(1) does for CPU usage. It listens to network traffic on a named interface and displays a table of current bandwidth usage by pairs of hosts.

Overview of IFTOP
* iftop (interface top) derives the name from the standard unix top command. top command displays real-time CPU Usage. iftop command displays real-time network bandwidth usage.

* iftop displays the network usage of a specific interface on the host.

* Using iftop you can identify which host is responsible for slowing down your network.

* To find out which process is causing the problem, note down the port number from the iftop and use netstat -p to identify the process.

* iftop monitors your network activity, and displays a table of current bandwidth.

Installation:
OpenSuSe user can use "1-click" installer to install iftop
OpenSuSe 11.1 - here
OpenSuSe 11.0 - here

Others:
Download the source code form the iftop website - here and compile/install iftop using following commands
# tar -zxvf iftop-0.17.tar.gz
# cd iftop-0.17
# ./configure
# make
# make install

Using:
Go to your cosole and use command: iftop to start monitoring the bandwidth usage.
you can also specify a particular interface with the -i option: iftop -i eth1, some other options ..
* -p Enables promiscuous mode, so the traffic on any interface (if there is more than once) is checked and counted

* -P Shows also the port that connection is using both on both side

* -N Do not resolve port names, which is the default behavior when you enable the -P option, so it will shows you :www or :80


Troubleshooting iftop Issues

Issue 1: While installing iftop from source, executing ./configure gives the following pcap.ph error message.

[root@localhost iftop-0.17]# ./configure

checking gethostbyaddr_r usability... yes

checking where to find pcap.h... no idea

configure: error: can't find pcap.h

You're not going to get very far without libpcap.

Solution 1: Make sure libpcap and libpcap-devel is installed. If not, install it as shown below.

# up2date -i libpcap libpcap-devel

Installing...

1:libpcap          ######################### [100%]

2:libpcap-devel  ######################### [100%]

# rpm -qa | grep libpcap

libpcap-devel-0.9.4-12.el5.0.1

libpcap-0.9.4-12.el5.0.1

Issue 2: While installing iftop from source, executing ./configure gives the following ncurses/mvchgat error message.

[root@localhost iftop-0.17]# ./configure

checking for a curses library containing mvchgat... none found

configure: error: Curses! Foiled again!

(Can't find a curses library supporting mvchgat.)

Consider installing ncurses.

Solution 2: Make sure ncurses and ncurses-devel is installed. If not, install it as shown below.

# up2date -i ncurses ncurses-devel

Installing...

1:ncurses          ######################### [100%]

1:ncurses-devel  ######################### [100%]

# rpm -qa | grep ncurses

ncurses-devel-5.5-24.20060715

ncurses-5.5-24.20060715

** Troubleshooting iftop Issues

Issue 1: While installing iftop from source, executing ./configure gives the following pcap.ph error message.

[root@localhost iftop-0.17]# ./configure

checking gethostbyaddr_r usability... yes

checking where to find pcap.h... no idea

configure: error: can't find pcap.h

You're not going to get very far without libpcap.

Solution 1: Make sure libpcap and libpcap-devel is installed. If not, install it as shown below.

# up2date -i libpcap libpcap-devel

Installing...

1:libpcap          ######################### [100%]

2:libpcap-devel  ######################### [100%]

# rpm -qa | grep libpcap

libpcap-devel-0.9.4-12.el5.0.1

libpcap-0.9.4-12.el5.0.1

Issue 2: While installing iftop from source, executing ./configure gives the following ncurses/mvchgat error message.

[root@localhost iftop-0.17]# ./configure

checking for a curses library containing mvchgat... none found

configure: error: Curses! Foiled again!

(Can't find a curses library supporting mvchgat.)

Consider installing ncurses.

Solution 2: Make sure ncurses and ncurses-devel is installed. If not, install it as shown below.

# up2date -i ncurses ncurses-devel

Installing...

1:ncurses          ######################### [100%]

1:ncurses-devel  ######################### [100%]

# rpm -qa | grep ncurses

ncurses-devel-5.5-24.20060715

ncurses-5.5-24.20060715
Labels: , ,

Monitoring Bandwidth Usage - iftop

Posted by Unknown at 21:32 0 comments
iftop does for network usage what top(1) does for CPU usage. It listens to network traffic on a named interface and displays a table of current bandwidth usage by pairs of hosts.

Overview of IFTOP
* iftop (interface top) derives the name from the standard unix top command. top command displays real-time CPU Usage. iftop command displays real-time network bandwidth usage.

* iftop displays the network usage of a specific interface on the host.

* Using iftop you can identify which host is responsible for slowing down your network.

* To find out which process is causing the problem, note down the port number from the iftop and use netstat -p to identify the process.

* iftop monitors your network activity, and displays a table of current bandwidth.

Installation:
OpenSuSe user can use "1-click" installer to install iftop
OpenSuSe 11.1 - here
OpenSuSe 11.0 - here

Others:
Download the source code form the iftop website - here and compile/install iftop using following commands
# tar -zxvf iftop-0.17.tar.gz
# cd iftop-0.17
# ./configure
# make
# make install

Using:
Go to your cosole and use command: iftop to start monitoring the bandwidth usage.
you can also specify a particular interface with the -i option: iftop -i eth1, some other options ..
* -p Enables promiscuous mode, so the traffic on any interface (if there is more than once) is checked and counted

* -P Shows also the port that connection is using both on both side

* -N Do not resolve port names, which is the default behavior when you enable the -P option, so it will shows you :www or :80


Troubleshooting iftop Issues

Issue 1: While installing iftop from source, executing ./configure gives the following pcap.ph error message.

[root@localhost iftop-0.17]# ./configure

checking gethostbyaddr_r usability... yes

checking where to find pcap.h... no idea

configure: error: can't find pcap.h

You're not going to get very far without libpcap.

Solution 1: Make sure libpcap and libpcap-devel is installed. If not, install it as shown below.

# up2date -i libpcap libpcap-devel

Installing...

1:libpcap          ######################### [100%]

2:libpcap-devel  ######################### [100%]

# rpm -qa | grep libpcap

libpcap-devel-0.9.4-12.el5.0.1

libpcap-0.9.4-12.el5.0.1

Issue 2: While installing iftop from source, executing ./configure gives the following ncurses/mvchgat error message.

[root@localhost iftop-0.17]# ./configure

checking for a curses library containing mvchgat... none found

configure: error: Curses! Foiled again!

(Can't find a curses library supporting mvchgat.)

Consider installing ncurses.

Solution 2: Make sure ncurses and ncurses-devel is installed. If not, install it as shown below.

# up2date -i ncurses ncurses-devel

Installing...

1:ncurses          ######################### [100%]

1:ncurses-devel  ######################### [100%]

# rpm -qa | grep ncurses

ncurses-devel-5.5-24.20060715

ncurses-5.5-24.20060715

** Troubleshooting iftop Issues

Issue 1: While installing iftop from source, executing ./configure gives the following pcap.ph error message.

[root@localhost iftop-0.17]# ./configure

checking gethostbyaddr_r usability... yes

checking where to find pcap.h... no idea

configure: error: can't find pcap.h

You're not going to get very far without libpcap.

Solution 1: Make sure libpcap and libpcap-devel is installed. If not, install it as shown below.

# up2date -i libpcap libpcap-devel

Installing...

1:libpcap          ######################### [100%]

2:libpcap-devel  ######################### [100%]

# rpm -qa | grep libpcap

libpcap-devel-0.9.4-12.el5.0.1

libpcap-0.9.4-12.el5.0.1

Issue 2: While installing iftop from source, executing ./configure gives the following ncurses/mvchgat error message.

[root@localhost iftop-0.17]# ./configure

checking for a curses library containing mvchgat... none found

configure: error: Curses! Foiled again!

(Can't find a curses library supporting mvchgat.)

Consider installing ncurses.

Solution 2: Make sure ncurses and ncurses-devel is installed. If not, install it as shown below.

# up2date -i ncurses ncurses-devel

Installing...

1:ncurses          ######################### [100%]

1:ncurses-devel  ######################### [100%]

# rpm -qa | grep ncurses

ncurses-devel-5.5-24.20060715

ncurses-5.5-24.20060715

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