mongotail 0.1.0

Log all MongoDB queries in a "tail"able way

Mongotail, Log all MongoDB queries in a “tail”able way.

mongotail is a command line tool to outputs any operation from a Mongo database in the standard output. You can see the operations collected by the database profiler from a console, or redirect the result to a file, pipes it with grep or other command line tool, etc.

The syntax is very similar to mongo client, and the output, as like tail command will be the latest 10 lines of logging.

But the more interesting feature (also like tail) is to see the changes in “real time” with the -f option, and occasionally filter the result with grep to find a particular operation.

Syntax

Usage:

mongotail [db address] [options]

“db address” can be:

foo	foo database on local machine (IPv4 connection)
192.169.0.5/foo	foo database on 192.168.0.5 machine
remotehost/foo	foo database on remotehost machine
192.169.0.5:9999/foo	foo database on 192.168.0.5 machine on port 9999
“[::1]:9999/foo”	foo database on ::1 machine on port 9999 (IPv6 connection)

Optional arguments:

-u USERNAME, --username USERNAME
                      username for authentication
-p PASSWORD, --password PASSWORD
                      password for authentication. If username is given and
                      password isn't, it's asked from tty.
-n N, --lines N       output the last N lines, instead of the last 10. Use
                      ALL value to show all lines
-f, --follow          output appended data as the log grows
-l LEVEL, --level LEVEL
                      Specifies the profiling level, which is either 0 for
                      no profiling, 1 for only slow operations, or 2 for all
                      operations. USES this option once before logging the
                      database
-s MS, --slowms MS    Sets the threshold in milliseconds for the profile to
                      consider a query or operation to be slow (use with
                      `--level 1`).
-h, --help            show this help message and exit
--version             show program's version number and exit

Enabling Database Profiling and Showing Logs

You have to activate first in the current database the profiler, so MongoDB will capture all the activity in a special document that is read by Mongotail.

You can achieve this with -l, --level option. For example, if you want to see the logs from MYDATABASE, first you have to execute this:

$ mongotail MYDATABASE -l 2

Then you can see the last lines of logging with:

$ mongotail MYDATABASE
2015-02-24 19:17:01.194 QUERY  [Company] : {"_id": ObjectId("548b164144ae122dc430376b")}
2015-02-24 19:17:01.195 QUERY  [User] : {"_id": ObjectId("549048806b5d3db78cf6f654")}
2015-02-24 19:17:01.196 QUERY  [Company] : {"_id": ObjectId("548b16df44ae122dc4303771")}
2015-02-24 19:17:10.729 COUNT  [User] : {"active": {"$exists": true}, "firstName": {"$regex": "mac"}}
...

NOTE: The level chosen can affect performance. It also can allow the server to write the contents of queries to the log, which might have information security implications for your deployment. Remember to setup your database profiling level to 0 again after debugging your data:

$ mongotail MYDATABASE -l 0

Installation

You can install the latest stable version with pip in your environment.

If you haven’t installed pymongo library do:

$ pip install pymongo

Then install this tool with:

$ pip install mongotail

Execute these command with administrator/root privileges.

You have to be installed pip tool first. In Debian/Ubuntu Linux distribution you can install it with (also with root privileges):

$ apt-get install python-pip python-dev

See INSTALL guide to install from sources.

About

Project: https://github.com/mrsarm/mongotail

Authors: (2015) Mariano Ruiz <[e-mail]>

License: GPL-3