Ping status UNKNOWN

[sergo]

Hi, have installed nagios-4.1.1 and nagios-plugins-2.1.1. And I have problem with plugin 'check_ping'.

Servis state information is:
Current status: UNKNOWN
Status information: /bin/ping -n -U -w 10 -c 5 127.0.0.1
CRITICAL - Could not interpret output from ping command

localhost has status DOWN.

Other services as Current load, HTTP, Root Partition is ok. And file /bin/ping has 777 (-rwxrwxrwx) permissions. I tried to execute

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/bin/ping -n -U -w 10 -c 5 127.0.0.1

and get

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PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data.
64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.030 ms
64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.041 ms
64 bytes from 127.0.0.1: icmp_seq=3 ttl=64 time=0.035 ms
64 bytes from 127.0.0.1: icmp_seq=4 ttl=64 time=0.026 ms
64 bytes from 127.0.0.1: icmp_seq=5 ttl=64 time=0.034 ms

--- 127.0.0.1 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 3999ms
rtt min/avg/max/mdev = 0.026/0.033/0.041/0.006 ms

In file commands.cfg check_ping is described as:

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define command{
        command_name    check_ping
        command_line    $USER1$/check_ping -H $HOSTADDRESS$ -w $ARG1$ -c $ARG2$ -p 5
        }

In file localhost.cfg check_ping is described as:

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define service{
        use                            local-service         ; Name of service template to use
        host_name                      localhost
        service_description            PING
        check_command                  check_ping!100.0,20%!500.0,60%
        }

I found the same problem in googl, and everywhere it was solved by changing permissions /bin/ping, but I allready have maximum permissions of this file.
So, can anybody help me and give same advises, what shuld I do

[tgriep]

It looks like the superuser bit isn't set on the ping command and that could be the cause of the issue.
Login as root to the server and run the following to add the su bit to the ping command.

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chmod u+s /bin/ping

Try that and see if this works for you.

[sergo]

It looks like the superuser bit isn't set on the ping command and that could be the cause of the issue.
Login as root to the server and run the following to add the su bit to the ping command.

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chmod u+s /bin/ping

Try that and see if this works for you.

I already tried to do it. But there was no result.

[sergo]

Well, I looked at commands.cfg and localhost.cfg and tried to execute this code as root user:

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./check_ping -H $HOSTADDRESS$ -w 3000.0,80% -c 5000.0,100% -p 5

and got this

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PING OK - Packet loss = 0%, RTA = 0.12 mslrta=0.118000ms;100.000000;500.000000;0.000000 pl=0%;20;60;0

It seems to work fine, is not it?

And then I became nagios user

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su nagios

then I did the same, and got this:

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/bin/ping -n -U -w -c 5  127.0.0.1
CRITICAL - Could not interpret output from ping command

Obviously my problem is hidden in permissions, but a dont know where exactly it is.

[rkennedy]

Can you post the permissions for us to look at?

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ls -la check_ping

Also, please run strace ./check_ping -H $HOSTADDRESS$ -w 3000.0,80% -c 5000.0,100% -p 5 (specifically with strace before it), as the nagios user, and also the root user. This will give us a bit of debug to see where the issue lies. Post the full output after doing so.

[sergo]

Can you post the permissions for us to look at?

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ls -la check_ping

Also, please run strace ./check_ping -H $HOSTADDRESS$ -w 3000.0,80% -c 5000.0,100% -p 5 (specifically with strace before it), as the nagios user, and also the root user. This will give us a bit of debug to see where the issue lies. Post the full output after doing so.

Permissions of the check_ping:

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-rwxrwxrwx  1  nagios  root  72400 Jul 19 10:58  check_ping

About strace... A installed nagios using Buildroot (cross toolchain system) because my machine has a specific architecture. So it is may be difficult or/and take a lot time to install strace in my machine.
Is there another way to find out where the problem is?

[tgriep]

Lets change the ownership of the user and group to nagios for that plugin
Login as root to the Nagios server and run the following to do that.
chown nagios.nagios check_ping

Then login to the server as nagios and run the plugin to see if it can be ran by the nagios user.

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su nagios
./check_ping -H $HOSTADDRESS$ -w 3000.0,80% -c 5000.0,100% -p 5

Try that and let us know if this works for you.

[sergo]

Lets change the ownership of the user and group to nagios for that plugin
Login as root to the Nagios server and run the following to do that.
chown nagios.nagios check_ping

Then login to the server as nagios and run the plugin to see if it can be ran by the nagios user.

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su nagios
./check_ping -H $HOSTADDRESS$ -w 3000.0,80% -c 5000.0,100% -p 5

Try that and let us know if this works for you.

Oh, it realy works! Thank you very much!

[mcapra]

Is it alright if we lock this thread and mark the issue as resolved?

[sergo]

Is it alright if we lock this thread and mark the issue as resolved?

Yes, it is)