hello

short answer : no, not outside of the box.

longer answer : it depends.

it depends on what type of iscsi you have, software, or hardware hba, it will be vendor dependant (whatever iscsi software or hardware you use… so many option I can’t begin to list them here)

basically iscsi will add devices to your os, that device is either present or absent, and it can be mounted as a partition (or not mounted because reasons) 

you could do a filesystem check, or check the presence of a file, or create a command/script depedant on your iscsi vendor

sorry to not be more helpful, try to see on your centos how you can see if your iscsi link is correctly working, if you can find a command line, with a bit of cleanup around the output, this could be a custom check that you can include in your monitoring

Hello Christophe,Actually, I'm setting up an iSCSI link on the CentOS servers that points to a Qnap NAS. It always has the same directory structure.Thanks for the idea of ​​testing for the presence of a "type" folder.Do you have the command syntax?Best regards,

if you use the linux nrpe check there are templates for that

if you use snmp, you can’t do that, but you can check the disk usage, that could be a way to see if the file system is mounted

the final option is check by ssh, Linux SSH | Centreon Documentation but I don’t use it personnaly, but there is file-size/file-date command

I can’t really give you examples

there is also a generic “check by ssh” that will let you pass a command and get the return, a simple “ls /yourpath/yourfile” 
ls will “exit 0” if the file is present, and “exit 2” if the file is not present

Thanks for the information, Christophe. I installed the model indicated, here is what I get:

but the resource status returns me the message: command execution failed

you probably need to install the plugin on the poller, that errror is usual when yuou didn”t install the plugin, and just the connector

and configure the nrpe agent on the host you need to monitor

there are documentation here on how to use connector/plugin Plugin Packs | Centreon Documentation

and here is a doc on the specific connector nrpe4 Linux NRPE4 | Centreon Documentation (there are multiple plugin version)

Hello Christophe,I have successfully installed Linux NRPE on the server to be monitored, as well as on Centreon.To test the presence of the iSCSI link, I chose the "OS-linux-file-date-generic-NRP-custom" template.Without specifying any value, the command is erroring.Thank you for your patience :-)

the error persists even when testing for the presence of a "test.txt" file

please run the command  (you can copy it with the small icon near “commande”), and run that in the ssh shell of the poller

that looks like it’s more a error because the plugin is not installed correctly, (that unkown error is more an install problem than a check problem)