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Log into http://cacti.geant.net/cacti/

Quick Reference

For those who definitely know what they're doing and just need a reminder of the commands:

• ssh -l dante.<surname> prod-cacti01-fra-de.geant.net

• chmod 777 to the /opt/cacti/rra/<name_of_rrd>.rrd                      <-- Richard has permissions to do this step, Ops does not!
• cd /tmp

• rrdtool dump /opt/cacti/rra/mx1_lon_uk_traffic_in_20683.rrd > /tmp/mx1_lon_uk_traffic_in_20683.rrd.xml

• vi /tmp/mx1_lon_uk_traffic_in_20683.rrd.xml
• sudo -u cactiuser mv /opt/cacti/rra/mx1_lon_uk_traffic_in_20683.rrd /opt/cacti/rra/mx1_lon_uk_traffic_in_20683.rrd.bak
• sudo -u cactiuser rrdtool restore /tmp/mx1_lon_uk_traffic_in_20683.rrd.xml  /opt/cacti/rra/mx1_lon_uk_traffic_in_20683.rrd
• sudo -u cactiuser scp -i /home/cactiuser/.ssh/id_dsa /opt/cacti/rra/mx1_lon_uk_traffic_in_20683.rrd cactiuser@prod-cacti02-vie-at.geant.net:/opt/cacti/rra/mx1_lon_uk_traffic_in_20683.rrd

Detailed Instructions

Locate the graph with the Spike:

...

Change to the /tmp directory and export the data to an XML file format.

Check that the chmod of the rrd file is set to 7777 prior to attempting to remove a spike.

rrdtool dump /opt/cacti/rra/mx1_lon_uk_traffic_in_20683.rrd > /tmp/mx1_lon_uk_traffic_in_20683.rrd.xml

Edit the  /tmp/mx1_lon_uk_traffic_in_20683.rrd.xml and find the offending data. As we know the data is in the order of 10e11, we can search for the following string e+11. We can see the timestamp is in the right range. 

NOTE: The values in the RRD file are in bytes per second. You will need to multiple these values by 8 to obtain the bits per second. The graphs on the website and CSV files that can be downloaded from the website all show the traffic levels in bits per second.

Inbound traffic:

<!-- 2016-01-18 00:00:00 UTC / 1453075200 --> <row><v> 3.5642652369e+07 </v><v> 1.1136736365e+06 </v></row>
<!-- 2016-01-19 00:00:00 UTC / 1453161600 --> <row><v> 9.0115656678e+07 </v><v> 3.1514951986e+06 </v></row>
<!-- 2016-01-20 00:00:00 UTC / 1453248000 --> <row><v> 3.8543163654e+11 </v><v> 9.2684560857e+09 </v></row>
<!-- 2016-01-21 00:00:00 UTC / 1453334400 --> <row><v> 8.0043154538e+07 </v><v> 2.7647348898e+07 </v></row>
<!-- 2016-01-22 00:00:00 UTC / 1453420800 --> <row><v> 1.0178635224e+08 </v><v> 2.1954640988e+07 </v></row>
<!-- 2016-01-23 00:00:00 UTC / 1453507200 --> <row><v> 6.5086071137e+07 </v><v> 2.7845010247e+07 </v></row>

...