Photon OS check_by_ssh

Icinga 2
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1

Hi,

I have some Photon OS VM machines in our environment (VMware appliance, not vCenter) and I want to monitor some checks with “check_by_ssh” command.

On the other VMs where I have Ubuntu for example the check are working great, only on the PhotonOS I got “Remote command execution failed”, the ssh session is also working.

For example if I want to get the uptime from the host with a simple command:
ssh nagios@ip-address uptime and i got the right uptime from the host

If I tryed with check_by_ssh method:
/usr/lib/nagios/plugins/check_by_ssh -H ip_address -l nagios -C “uptime”
Remote command execution failed:

I added for test purpose the “session required pam_exec.so /bin/true” to /etc/pam.d/sshd config but nothing changed, I think the os not allows to run commands remotely from ssh.

Thanks in advance!

2

Are you trying ssh and check_by_ssh as the same user and the same ip/hostname/FQDN?

You could add -v to get more details.

3

Yes, I am trying ssh manually and check_by_ssh to the same host with same user (nagios) with ip address.

I tryed with -v option:

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With option -v at the final I see the same Remote command execution failed, but before that I can see the uptime information also.

4

It shows stdout correctly but stderr additionally. Something related to this PR. Hmm, no idea.

5

Maybe try https://github.com/Linuxfabrik/monitoring-plugins/tree/main/check-plugins/by-ssh, which is able to handle stdout and stderr?

1 Like
6

Update in this topic:

icinga services.conf :
apply Service “Uptime” {
import “generic-service”
check_command = “check_by_ssh”
vars.by_ssh_command = “/home/nagios/bin/check_uptime”
vars.by_ssh_arguments = {
“-H” = “$address$”
“-C” = “$by_ssh_command$”
“-l” = “$ssh_username$”
“-E” = “false”
}
assign where host.groups && (host.groups.contains(“photonos”))

}

If I run the command from icinga server:
nagios@vcloud-mon01:~$ /usr/lib/nagios/plugins/check_by_ssh -H 10.102.36.191 -l nagios -C “uptime” -E “false”
08:47:04 up 186 days, 14:02, 2 users, load average: 0.15, 0.14, 0.10

But on the icinga web I the same error as originally:
Plugin Output
Remote command execution failed:

On the remote host for test purpose I added the nagios user to sudoers:
nagios ALL=(ALL:ALL) ALL