Posts Tagged script
LCOD 5.29.2011 – 2 quick TCP port check scripts in Python
Posted by Jon Zobrist in Programming, Python on May 29, 2011
Disclaimer : These scripts could be considered malicious and should only be used to test servers with permission from the server administrator. I accept no responsibility for your use of these scripts, and make no warranty about their usefulness either express or implied.
I often find myself troubleshooting someone’s network connectivity, or one of my servers ability to receive connections or mass connections.
For this, nmap is invaluable, but sometimes it’s easier to just send someone a script to run, especially in larger companies where things like nmap, and other port scanners are frowned on.
So, here are 2 scripts that take the same arguments HOST PORT.
They are tcpcheck.py (here is the gzipped version), and tcpcheck-bulk.py (here is the gzipped version).
tcpcheck.py makes 1 connection to a TCP port and reports success or failure.
Example usage and output :
./tcpcheck.py jonzobrist.com 80
Success. Connected to jonzobrist.com on port: 80
./tcpcheck.py jonzobrist.com 81
Failure. Cannot connect to jonzobrist.com on port: 81
tcpcheck-bulk.py is hard wired to attempt 1500 connections to a TCP port and reports success/failures.
Example usage and output is :
./tcpcheck-bulk.py jonzobrist.com 80
Done with jonzobrist.com on port: 80
Done. Failures : 0 Successes : 1500
This script was very useful when we tried to determine server performance over a link that seemed to be killing our connections.
Please feel free to use it, and share if it helped.
Delete lots of EC2 EBS volumes
Posted by Jon Zobrist in AWS, Bash, EBS, Programming on May 23, 2011
Here is a quick script to delete lots of EBS volumes on Amazon EC2.
The output from something like
ec2-describe-instances i-6fc30f01 | grep ‘^BLOCKDEVICE’ | awk ‘{ print $3 }’ > delete-these-volumes.txt
Then run
./delete-volumes.sh delete-these-volumes.txt
Can be fed into this script (you may want to edit the file first, I accept no responsibility for you deleting your volumes, with or without my script.
Download the gzipped script here.
Example output from me deleting 60 real volumes:
My EC2 EBS RAID-0 creation script
Posted by Jon Zobrist in AWS, Bash, EBS, EC2, Linux, Linux Support - Servers, Programming on May 4, 2011
I want to write up a full howto/tutorial, but have not had the time.
Here is the script that I referred to in my post at http://jonzobrist.com/2011/04/16/ec2-raid0-on-linux-with-ebs-volumes-notes/
This program is distributed in the hope that it will be useful but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License HERE for more details.
http://jonzobrist.com/files/setup-ec2-raid-0.zip
http://jonzobrist.com/files/setup-ec2-raid-0.sh.gz
This script needs an AWS command line setup, and may need some minor tweaking if you’re not running a Ubuntu server.
Ubuntu’s latest AMI’s are available for 10.04 here.
Please feel free to submit patches, comments, or questions.
Thanks to everyone whose helpful posts online and in the AWS forums helped me with this script. I could not have done it with out your generous sharing of work.
Enjoy!
LCOD – 4.12.10 – Quick Mysqlreport to e-mail setup
Posted by Jon Zobrist in Linux, Linux Command of the Day, MySQL Server Support on April 12, 2010
This will be a quick install to setup your server to e-mail you daily mysql reports using the cool mysqlreport application at hackmysql.com
Click to continue reading “LCOD – 4.12.10 – Quick Mysqlreport to e-mail setup”
LCOD – 11.17.09 – Simple page/alert email script
Posted by Jon Zobrist in Bash, Linux, Linux Command of the Day, Programming on November 17, 2009
Here’s a quick page script for *nix boxes with mail.
I grabbed the mail / file redirect from
http://theos.in/shell-scripting/send-mail-bash-script/
#!/bin/bash
#Author : dougnaka@gmail.comThis e-mail address is being protected from spam bots, you need JavaScript enabled to view it
#Description : Quick alert/page script, edit EMAIL="" to include a comma separated list of emails to send to
#Usage : page.sh "Short or long message"
if [ "${1}" ]
then
SUBJECT="[ALERT] ${1}"
EMAIL=" someone@example.com"
EMAILMESSAGE="/tmp/`date +%s`-message"
echo "ALERT: at `date`" > ${EMAILMESSAGE}
echo "${1}" >> ${EMAILMESSAGE}
echo "From `hostname`" >> ${EMAILMESSAGE}
mail -s "${SUBJECT}" "${EMAIL}" < ${EMAILMESSAGE}
/bin/rm ${EMAILMESSAGE}
else
echo "Usage: ${0} MESSAGE"
exit 1
fi
LCOD 10.9.09 – Script to retry command
Posted by Jon Zobrist in Linux, Linux Command of the Day on October 9, 2009
I use this almost exclusively with trying to ssh to a machine that’s rebooting, but it’s useful to have, and, I think, should be included as a default command in any Linux distro.
Script : retry
Usage : retry command [args]
Code :
#!/bin/bash
while true
do
echo "trying $@ at `date`"
$@
sleep 1
done
Enjoy.
LCOD 11.14.07 – Quick RAID check script for cron
Posted by Jon Zobrist in Bash, Linux, Linux Command of the Day, Programming on November 14, 2007
This is a quick script that will let you run the new raid checks, or repair, or pause a running raid check. It doesn’t do e-mails or anything, and from what I read on this thread it’s something mdadm needs to be set to watch for. I ran the check on a RAID and received no output, so I guess it was ok?
I will update the script as I find out more. I’d like to add a simple escalation from check to rebuild? (I think it does this anyways), and an e-mail status report, or even a syslog call saying I ran all things look good.
#!/bin/bash
###############
# Quick script to use raid functionality
# Author : Jon Zobrist < jon@bluesun.netThis e-mail address is being protected from spam bots, you need JavaScript enabled to view it >
# http://www.bluesun.net/
# License : LGPL
# Version : 1.0
# Date : 11.14.07
# install/notes:
# put it somewhere, /root/bin/ is where I prefer
# put this in your root crontab to run from cron monthly
# @monthly /root/bin/checkraids check > /root/logs/cron.log 2>&1
###############
case "$1" in
check)
for raid in /sys/block/md*/md/sync_action
do
echo check > $raid
done
;;
repair)
for raid in /sys/block/md*/md/sync_action
do
echo repair > $raid
done
;;
pause)
for raid in /sys/block/md*/md/sync_action
do
echo idle > $raid
done
;;
status)
for raid in /sys/block/md*/md/sync_action
do
echo "******************************"
echo $raid `cat $raid`
echo ""
done
;;
*)
echo "Usage : $0 check|repair|pause|status"
;;
esac
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