Need to run script at startup.

pinga123 · 02-04-2010, 12:21 AM

Hi guys ,

I Need to run a specific command (pinging a particular machine).
Which need to run every time i reboot the server till the time it shut down.
What is the preferred way of doing this.

Will it impact my system performance.

My Operating system is as below.

Code:

[root@XYZ~]# lsb_release -a
LSB Version:    :core-3.1-ia32:core-3.1-noarch:graphics-3.1-ia32:graphics-3.1-noarch
Distributor ID: OracleVMserver
Description:    Oracle VM server release 2.2.0
Release:        2.2.0
Codename:       n/a
[root@XYZ~]# uname -r
2.6.18-128.2.1.4.9.el5xen

linuxlover.chaitanya · 02-04-2010, 12:33 AM

Ping should not take too much of your local resources but how many pings you need to send? Keep pinging? It will definitely not recommended. Will slow up your network a bit.
You can run the script at boot by putting it rc.local file in /etc.

pinga123 · 02-04-2010, 01:01 AM

Quote:

Originally Posted by linuxlover.chaitanya

Ping should not take too much of your local resources but how many pings you need to send? Keep pinging? It will definitely not recommended. Will slow up your network a bit.
You can run the script at boot by putting it rc.local file in /etc.

Thank you very much chaitanya.That was indeed very helpful .I need to ping the machines continuously i m afraid it might slow down the network but i dont have any other option left with me .

vinaytp · 02-04-2010, 01:01 AM

Hi pinga123,

If you want to just check weather the system is up, then you can send only 2 or 3 echo request packets through ping. This ping will not continue indefinitely.

Just place following script pinging.sh under /etc/rc.local

Code:

#!/bin/bash
ping -c 3 ip OR fully.quantified.domain.name;date > /home/username/temp

This will not consume much resources of your system..
You can see output in temp file of your home directory...

catkin · 02-04-2010, 05:22 AM

Or, if you want to keep pinging indefinitely without unnecessary network load, insert a delay (here 30 secs) between groups of 3 pings

Code:

#!/bin/bash
while true
do
    ping -c 3 ip OR fully.quantified.domain.name;date > /home/username/temp
    sleep 30
done

scheidel21 · 02-04-2010, 08:17 AM

I would recommend the delay idea mentioned in the above bash script, you can continuously ping the machine to ensure it is up without continuously pinging. i.e. every minute 2 ping requests are sent, if they don't come back the machine is down. If they do come back you are still good to go.

nodopro · 02-04-2010, 11:05 AM

Ping,
I think you should mention about your purpose of pinging the machine continuously so these people can give you a suggestion or solution. I think putting sleep (delay time) is a good idea rather than ping after ping.