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| Round Robin Database (RRD) error "Cannot get RRD data" and how to troubleshoot. |
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| colour | Green |
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| title | LAST TESTED ON CHECKMK 2.3.0P1 |
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| borderColor | black |
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| bgColor | #f8f8f8 |
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| title | Table of Contents |
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Problem
You may be affected by thatimpacted by a Cannot Create Graph error:
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To visualize a graph, Checkmk is using uses RRD. The RRD needs, by nature, two files:, stored in ~/var/check_mk/rrd/HOSTNAME
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-rw-rw------ 1 mastermysite mastermysite 65 Oct 93 Jun 2 07:219 13:34 CPU_Utilization_Packet_CPU_2utilization.info
-rw-r--r-- 1 mastermysite mastermysite 1534768 384952Oct Jun 2 11:2230 09:00 CPU_Utilization_Packet_CPU_2utilization.rrd |
The .rrd file stores all the data, and the .info file defines the service metrics. If You will face the message above if one of the file files is missing, you will face the message above. This message will also be displayed in the cmc.log:
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OMD[mysite]:~$ tail ~$ tail -f var/log/cmc.log
20222024-0610-0230 1209:0902:4155 [4] [main]client [rrd0] [rrdcached at /omd/sites/master/tmp/run/rrdcached.sock] >> -1 No such file: Error accessing RRD: opening '/opt/omd/sites/mastermysite/var/check_mk/rrd/<HOSTNAME>linux/CPU_Utilization_Packet_CPU_1.rrd
2022-06-02 12:10:41utilization.rrd': No such file or directory
2024-10-30 09:02:55 [4] [main]client [rrd0] [rrdcached at /omd/sites/master/tmp/run/rrdcached.sock] >> -1 No such file: Error accessing RRD: opening '/opt/omd/sites/mastermysite/var/check_mk/rrd/<HOSTNAME>linux/CPU_Utilization_Mgmt_CPUTCP_Connections.rrd
2022-06-02 12:10:41': No such file or directory
2024-10-30 09:02:55 [4] [main]client [rrd0] [rrdcached at /omd/sites/master/tmp/run/rrdcached.sock] >> -1 No such file: Error accessing RRD: opening '/opt/omd/sites/mastermysite/var/check_mk/rrd/<HOSTNAME>linux/CPUSystemd_Utilization_Packet_CPU_0.rrdTimesyncd_Time.rrd': No such file or directory |
Solution
Unfortunately, for some reasons reason, one of the file files is missing. In that case, it is the .rrd file. So to make the graphs working work again, you need to do the following:
Stop the site:
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OMD[mysite]:~$ omd stop |
Run the below oneliner to find all the .info files with that have a missing .rrd file and to delete them manually (do an omd stop beforehand!): :
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The below oneliner will not delete anything, it only lists the missing files. |
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OMD[mysite]:~$ for i in $(find ~/var/check_mk/rrd -name "*.info"); do test -e "${i%info}rrd" || echo "$i"; done
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The output is the following:
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/omd/sites/mysite/var/check_mk/rrd/<HOSTNAME>linux/PINGCPU_utilization.info
/omd/sites/mysite/var/check_mk/rrd/<HOSTNAME>linux/CPU_Utilization_Mgmt_CPUTCP_Connections.info
/omd/sites/mysite/var/check_mk/rrd/<HOSTNAME>linux/CPUSystemd_Utilization_Packet_CPU_1.info
/omd/sites/mysite/Timesyncd_Time.info |
Next, you can either delete the .info files manually, or automatically, by replacing echo $i with rm $i in the provided oneliner. Like this:
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OMD[mysite]:~$ for i in $(find ~/var/check_mk/rrd/<HOSTNAME>/CPU_Utilization_Packet_CPU_0.info |
Now you have a list with files to delete. Please replace echo $i with rm $i in order to delete those files.
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-name "*.info"); do test -e "${i%info}rrd" || rm "$i"; done |
After you delete the affected files, you need to restart start the site , so and the new files are created.required files will be recreated:
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OMD[mysite]:~$ omd start |
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Checkmk does not delete any .rrd file. So it could be deleted by a custom cleaning job! |
Related articles
| Filter by label (Content by label) |
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