Nagios Support Forum

Using chrome browser, select Dashboards, [Add dashlets] button results in a blank screen
Unable to build any dashlets.

Centos9 build with the following rrdtool packages installed.

rrdtool.x86_64 1.7.2-21.el9
rrdtool-devel.x86_64 1.7.2-21.el9
rrdtool-perl.x86_64 1.7.2-21.el9
python3-rrdtool.x86_64 1.7.2-21.el9

Has anybody else experienced this?
I've used a chrome browser debug console, which displays Uncaught TypeError: cannot read properties of undefined (reading 'length').
I've tried Microsoft Edge browser (same issue)
I've tried running browser on VM console, same issue.

Is there something in Nagiosna settings I can enable debugging to glean more information as to what might be the real issue or indeed, missing on this server. As always, appreciate any insights or direction on how best to resolve this with nagiosna-2026R1 build.

Resolved - built a server image using "minmal" versus Server with GUI.
Noticed that the rrdtool is built specific to the nagiosna build. Dashlets now work

My bad, hope this helps somebody who stumbles on this issue.

DVN wrote: ↑Thu Jan 29, 2026 2:25 pm Resolved - built a server image using "minmal" versus Server with GUI.
Noticed that the rrdtool is built specific to the nagiosna build. Dashlets now work

My bad, hope this helps somebody who stumbles on this issue.

Ah yeah that would do it having differing versions. Did you install rrdtool for something else or was it something that came with the gui? RRDtool being included in the gui install is a little surprising.

When install, default is "Server with GUI", we also typically select

FTP Server
Mail Server
Performance Tools
Basic Web Server
Legacy UNIX Compatibility
Development Tools
Graphical Administration Tools
Security Tools
System Tools

rrdtool is in the base/AppStream repository, while rrdtool-devel is in CRB with monitorix dependency.

I'll try a build without Security Tools and System Tools, to see if that resolves my symptom and report back.

Worked! New install, made sure rrdtool was not there first, then used fullinstall and checked nagiosna data sources, dashlets etc.

# dnf list rrdtool*
CentOS Stream 9 - BaseOS 4.4 MB/s | 8.9 MB 00:02
CentOS Stream 9 - AppStream 7.8 MB/s | 26 MB 00:03
CentOS Stream 9 - Extras packages 80 kB/s | 20 kB 00:00
Available Packages
rrdtool.i686 1.7.2-21.el9 appstream
rrdtool.x86_64 1.7.2-21.el9 appstream
rrdtool-perl.x86_64 1.7.2-21.el9 appstream

Interesting, thats good to know. I wouldn't have thought that rrdtool would be included in the tooling that you can include in the install options. Guess I underestimate how much its still used. Glad you were able to find this out and for sharing.