Cacti 1.1.38 ERROR Opening .rrd No Such file or directory

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So after installing cacti 1.1.38 , rrd tools ,snmp-utils and after successfully adding the device , the graphs are not genrating and simply getting the below error.

Enable ‘debug’ option for the graphs under Management > Graphs, that will show the rrd logs in cacti web gui

First thing , check the user – ‘cacti’ is created as part of the installation:

less /etc/passwd

This should show the system user : cacti:x:999:999::/usr/share/cacti:/sbin/nologin

If this is missing , create the user :

 /usr/sbin/useradd -b /usr/share -d /usr/share/cacti -m -r -s /sbin/nologin cacti

This might give you an error if user home directory already exists but you can ignore it as it will still create the user for you:

Now check the ownership of the rra files

cd /var/lib/cacti/

 ls -ltr 
   drwxrwx---  2 root www-data 4096 Oct 25 11:02 rra

The root and the web user worked for me , but many recommeded changing the ownership to cacti:root

chown cacti:root rra

The one other file you need to check is the cronjob running for the polling interval. If the polling is not happenning it will not generate the graph

vi /etc/cron.d/cacti

Try run this cron as root user and restart the cron service

** * * * root php /usr/share/cacti/site/poller.php

You can also manually run the poller.php

php /usr/share/cacti/site/poller.php

If you don’t get an error here , your polling works fine . Then go back to your graph and wait for good few minutes to get tha data updated there :