Shantanu's Blog

Corporate Consultant

November 01, 2016

 

sysdig for system admins

What about a tool for sys admin that has all the utilties those we use everyday?
sysdig is a combination of strace + tcpdump + htop + iftop + lsof + transaction tracing

It is an open source system-level exploration tool that captures system state and activity.

Here is how to install it...

curl -s https://s3.amazonaws.com/download.draios.com/stable/install-sysdig | sudo bash

And here are a few examples

Dump system activity to file,
sysdig -w trace.scap

Show all the interactive commands executed inside a given container.
sysdig -pc -c spy_users container.name=wordpress1

View the top network connections for a single container.
sysdig -pc -c topconns container.name=wordpress1

See all the GET HTTP requests made by the machine
sudo sysdig -s 2000 -A -c echo_fds fd.port=80 and evt.buffer contains GET

See all the SQL select queries made by the machine
sudo sysdig -s 2000 -A -c echo_fds evt.buffer contains SELECT

See queries made via apache to an external MySQL server happening in real time
sysdig -s 2000 -A -c echo_fds fd.sip=192.168.30.5 and proc.name=apache2 and evt.buffer contains SELECT

More examples can be found here..

http://www.sysdig.org/wiki/sysdig-examples/#application

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October 14, 2016

 

Using pandas series instead of dictionary

Pandas series object has several advantages over traditional dictionary object. For e.g.

import pandas as pd
myseries = pd.Series(index=['india', 'usa', 'india'], data=[10,20,30])

myseries.sum()
60

myseries.groupby(myseries.index).sum()
india    40
usa      20
_____

In order to get the total of all dic values, we need to use for loop because there is no such built-in method.

mydic=dict(zip(['india', 'usa'],[10,20]))

mytotal=0
for i in mydic:
    mytotal += mydic[i]

Apart from this level of complexity, there is a fundamental difference between the two. Dictionary does not support duplicate values.

mydic=dict(zip(['india', 'usa', 'india'],[10,20,30]))

The above code will generate a dictionary as shown below.

{'india': 30, 'usa': 20}

The first value india - 10 is overwritten by the next one with value 30. This can be avoided if we use pandas series.
 _____

I would suggest to convert the dictionary to pandas series and then use series methods on it. For e.g.

pd.Series(mydic).sum()
 

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October 10, 2016

 

manage images using python

Here is an example how you can manage images using python

import urllib
urllib.urlretrieve("http://www.blog.pythonlibrary.org/wp-content/uploads/2016/10/jelly-247x300.png", "jelly.jpg")

# display image inline
from IPython.display import Image
Image(filename='jelly.jpg')

# apply split, crop and filter effects using image methods
from PIL import Image, ImageFilter
myimage = Image.open('jelly.jpg')
r,g,b,x=myimage.split()
myimage.histogram()

myimage.crop((0, 80, 200, 400))

myimage.filter(ImageFilter.BLUR)
# SHARPEN, DETAIL, EDGE_ENHANCE, EMBOSS, SMOOTH, etc.

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October 05, 2016

 

shell script to backup all mysql tables

This is a generic shell script that will take the backup of all mysql tabels in CVS format.
I have added --where clause to mysqldump command. It will take backup of 10 rows of each table. This is for testing purpose only. While implementing the script in production evvironment, remove that where clause.

#!/bin/sh
mydate=`date +"%d-%m-%Y-%H-%M"`

for db in `mysql -Bse"show databases"`
do
mydir='/tmp/testme/'$mydate/$db
rm -rf $mydir
mkdir -p $mydir
chmod 777 $mydir

for i in `mysql -Bse "select TABLE_NAME from information_schema.tables where TABLE_SCHEMA = '$db'"`
do
# take backup of only 10 rows for testing purpose
# remove --where clause in production
mysqldump $db $i --where='true limit 10' --tab=$mydir

done
done

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October 02, 2016

 

Online utilities for python

We can convert any git repository into a working python notebook using the online service offered by mybinder. For e.g. this my public repo that is forked from someone else's code.

https://github.com/shantanuo/data-visualization

Simply replace the "github.com" address with "mybinder.org/repo/" and we can execute the commands. The URL will look like this...

http://mybinder.org/repo/shantanuo/data-visualization
_____

Here is good python tutorial that will let anyone learn how to use python.

https://campus.datacamp.com/courses/intro-to-python-for-data-science/chapter-2-python-lists?ex=8

datacamp has an excellent interactive python tutorial that I would recommend to anyone.

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