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You are here: Home » Join/Merge Multiple Log Files For Big Data Analysis

By Abhishek Ghosh June 27, 2017 9:03 am Updated on June 27, 2017

Join/Merge Multiple Log Files For Big Data Analysis

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Normally log automatically should grow as big possible. But we use logrotate which does the opposite action as running cat and other tools on SSH over big files consumes memory, time and often difficult to do what we want. Also, old files are compressed. Here are the ways to join/merge multiple log files for big data analysis, store them to openstack based cloud storage and delete old files.

Join-Merge Multiple Log Files For Big Data Analysis

 

Join/Merge Multiple Log Files For Big Data Analysis

 

To test this method, you can go to /var/log/ and your web server’s directory like /var/log/nginx or /var/log/apache2. There will be access.log files. In order to get a list of filenames sorted by time listed by newest first, you can run this command :

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ls -t

Normally we can run cat to concat files in this fashish :

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cat access.log access.log.1 >> all_access.log

But more that access.log.1 become compressed, which we can list by running this command :

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ls -t | grep access

Which will give this kind of output :

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access.log
access.log.1
access.log.2.gz
access.log.3.gz
access.log.4.gz
access.log.5.gz
access.log.6.gz
access.log.7.gz
access.log.8.gz
access.log.9.gz
access.log.10.gz
access.log.11.gz
access.log.12.gz
access.log.13.gz
access.log.14.gz
other_vhosts_access.log

To make it practical, we will create a directory named access_combo :

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mkdir /var/log/apache2/access_combo

Then move all the files to that directory :

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mv /var/log/apache2/access.log* /var/log/apache2/access_combo

Move the current access.log back, properly chown and restart web server :

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cp /var/log/apache2/access_combo/access.log /var/log/apache2/access.log
chown www-data:www-data /var/log/apache2/access.log
echo " " > /var/log/apache2/access.log
systemctl restart apache2

echo " " > /var/log/apache2/access.log command empties a file.

For the compressed files, we can use zcat instead of cat like :

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zcat access.log.2.gz access.log.3.gz >> all_access.log

As only two files are uncompressed in our case, we can compress them and delete the original :

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cd /var/log/apache2/access_combo/
tar -cvzf access.log.gz access.log
tar -cvzf access.log.1.gz access.log.1
rm access.log
rm access.log.1

Now if you run ls -t, you’ll get a sorted, same format list of files :

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cd /var/log/apache2/access_combo/
ls -t
# output
access.log.1.gz  access.log.4.gz  access.log.8.gz   access.log.12.gz
access.log.gz    access.log.5.gz  access.log.9.gz   access.log.13.gz
access.log.2.gz  access.log.6.gz  access.log.10.gz  access.log.14.gz
access.log.3.gz  access.log.7.gz  access.log.11.gz

We can simply merge them them with a time stamp :

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cd /var/log/apache2/access_combo/
zcat access.log.* > merged_access_`date +"%d-%m-%Y"`.log

The command will take some time. However, I will suggest a manual work as possibly you need a manual check of dates of each files, access.log.1.gz not newest. access.log.14.gz is oldest in out case.

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cd /var/log/apache2/access_combo/
zcat access.log.gz > merged_access.log
zcat access.log.1.gz > merged_access.log
zcat access.log.2.gz > merged_access.log
...
...
zcat access.log.14.gz > merged_access.log

We can rename with date stamp :

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mv merged_access.log merged_access_`date +"%d-%m-%Y"`.log

Now, we do not need the old compressed files :

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cd /var/log/apache2/access_combo/
rm access.log.*

The total thing appearing many commands but we can create a small bash script to make it automated except the last step to merge :

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#! /bin/bash
 
mkdir /var/log/apache2/access_combo
mv /var/log/apache2/access.log* /var/log/apache2/access_combo
cp /var/log/apache2/access_combo/access.log /var/log/apache2/access.log
chown www-data:www-data /var/log/apache2/access.log
echo " " > /var/log/apache2/access.log
systemctl restart apache2
tar -cvzf /var/log/apache2/access_combo/access.log.gz /var/log/apache2/access_combo/access.log
tar -cvzf /var/log/apache2/access_combo/access.log.1.gz /var/log/apache2/access_combo/access.log.1
rm /var/log/apache2/access_combo/access.log
rm /var/log/apache2/access_combo/access.log.1
echo "Ready to merge the files:"
ls -t

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Abhishek Ghosh

About Abhishek Ghosh

Abhishek Ghosh is a Businessman, Surgeon, Author and Blogger. You can keep touch with him on Twitter - @AbhishekCTRL.

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About This Article

Cite this article as: Abhishek Ghosh, "Join/Merge Multiple Log Files For Big Data Analysis," in The Customize Windows, June 27, 2017, January 31, 2023, https://thecustomizewindows.com/2017/06/joinmerge-multiple-log-files-big-data-analysis/.

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