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check_by_ssh host key verification failed
Posted: Thu Oct 23, 2014 3:33 am
by MichielvM
hi,
I have a Linux box on which I need to check diskspace via check_by_ssh.
From the commanline everything looks ok!
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/usr/local/nagios/libexec/check_by_ssh -H x.x.x.x -l nagios -C "/home/nagios/libexec/check_disk -w 10 -c 5 -u GB /app"
DISK OK - free space: /app 85 GB (96% inode=99%);| /app=2GB;83;88;0;93
But when Xi has a go, it returns:
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Remote command execution failed: Host key verification failed.
I've googled a few similar, but not the same, issues. They don't really offer a solution.
I guess this has something to do with how Xi interprets things and I probably need a special character somewhere... But I'm at a loss as to what and where.....
Re: check_by_ssh host key verification failed
Posted: Thu Oct 23, 2014 4:53 am
by MichielvM
addition to the above:
The remote host is an Ubuntu machine.
When I execute the command from cli, the /var/log/auth.log on remote host shows:
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Oct 23 11:29:58 RH-01 sshd[54712]: Accepted publickey for nagios from <Nagios_IP> port 59464 ssh2: RSA <key_id>
Oct 23 11:29:58 RH-01 sshd[54712]: pam_unix(sshd:session): session opened for user nagios by (uid=0)
Oct 23 11:29:59 RH-01 sshd[54760]: Received disconnect from <nagios_ip>: 11: disconnected by user
Oct 23 11:29:59 RH-01 sshd[54712]: pam_unix(sshd:session): session closed for user nagios
When Xi has a go, it shows:
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Oct 23 11:41:55 RH-01 sshd[54817]: Connection closed by <nagios_ip> [preauth]
Oct 23 11:41:55 RH-01 sshd[54814]: Connection closed by <nagios_ip> [preauth]
Oct 23 11:41:55 RH-01 sshd[54815]: Connection closed by <nagios_ip> [preauth]
Oct 23 11:41:55 RH-01 sshd[54816]: Connection closed by <nagios_ip> [preauth]
Which leads me to believe Xi is the culprit here...
Re: check_by_ssh host key verification failed
Posted: Thu Oct 23, 2014 11:04 am
by abrist
Can you show us the service check definition from XI (including args)?
Are you allowing XI to run the check normally through the scheduler, or are you just testing the check? (testing the check will try to run it as apache which will obviously fail)
Re: check_by_ssh host key verification failed
Posted: Fri Oct 24, 2014 2:38 am
by MichielvM
Not entirely sure which you want to see, so here's both.
This is an excerpt from the cfg file (they all fail the same..)
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define service {
host_name amd-zz-lin-01
service_description Root App Disk Space
use generic-service
check_command check_xi_by_ssh!-l nagios !-C "/home/nagios/libexec/check_disk -w 10 -c 5 -u GB /app"!!!!!!10.213.232.201
max_check_attempts 5
check_interval 5
retry_interval 1
check_period 24x7
notification_interval 60
notification_period standbyuren
notification_options c,r,
contacts nagiosadmin
_xiwizard sshproxy
register 1
}
A screenie from the same check in Xi (2012R2.9)
$ARG2$ =
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-C "/home/nagios/libexec/check_disk -w 10 -c 5 -u GB /app"
Re: check_by_ssh host key verification failed
Posted: Fri Oct 24, 2014 11:11 am
by Box293
MichielvM wrote:From the commanline everything looks ok!
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/usr/local/nagios/libexec/check_by_ssh -H x.x.x.x -l nagios -C "/home/nagios/libexec/check_disk -w 10 -c 5 -u GB /app"
DISK OK - free space: /app 85 GB (96% inode=99%);| /app=2GB;83;88;0;93
But when Xi has a go, it returns:
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Remote command execution failed: Host key verification failed.
When you test from the command line, are you testing as the nagios user? This is extremely important for check_by_ssh!
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su nagios
/usr/local/nagios/libexec/check_by_ssh -H x.x.x.x -l nagios -C "/home/nagios/libexec/check_disk -w 10 -c 5 -u GB /app"
Re: check_by_ssh host key verification failed
Posted: Wed Nov 05, 2014 3:40 am
by MichielvM
Nailed it.
I generated new ssh keys for user Nagios.