Socket timeout / Connection Refused

[abrist]

You can ignore the warnings. You will have to add your iptables rules to:

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/etc/init.d/iptables.rules

To get nagios to start on boot, you need to add it to the init system in the same way you added iptables (except for downloading the init script as it already exists in /etc/init.d):

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update-rc.d nagios defaults

And you may need to add httpd (apache2) as well:

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update-rc.d apache2 defaults

[DiegoAnjos]

abrist

I tried to add Nagios to startup but now I can not start apache2.
Nagios can be started/stopped but I am not able to access it on web.

[*]srvnagios:~# /etc/init.d/apache2 start
Starting web server: apache2(98)Address already in use: make_sock: could not bind to address 0.0.0.0:80
no listening sockets available, shutting down
Unable to open logs
Action 'start' failed.
The Apache error log may have more information.
failed!

How can I revert this mess?

[abrist]

Looks like apache is already loading on boot? Remove the extra from the rc system:

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update-rc.d apache2 remove

[DiegoAnjos]

Did not work.

srvnagios:~# /etc/init.d/apache2 status
Apache2 is NOT running.

But I can not start it. Same error.

[DiegoAnjos]

I restarted the Debian machine and apache started as well. But if I stop it, I am not able to start it again.

[abrist]

Check to make sure you do not have more than 1 instance of apache running:

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ps -aef | grep apache

[DiegoAnjos]

srvnagios:~# ps -aef | grep apache
root 1117 1 0 18:19 ? 00:00:00 /usr/sbin/apache2 -k start
www-data 1139 1117 0 18:20 ? 00:00:00 /usr/sbin/apache2 -k start
www-data 1140 1117 0 18:20 ? 00:00:00 /usr/sbin/apache2 -k start
www-data 1141 1117 0 18:20 ? 00:00:00 /usr/sbin/apache2 -k start
www-data 1142 1117 0 18:20 ? 00:00:00 /usr/sbin/apache2 -k start
www-data 1143 1117 0 18:20 ? 00:00:00 /usr/sbin/apache2 -k start
root 2088 2063 0 18:21 pts/0 00:00:00 grep apache

[yancy]

Diego,

The issue is that NSClient (0.3.8) is not sending information to Nagios.

By default NSClient is an active check, which means Nagios (on your Debian machine) starts the connection and receives a reply. Since Nagios initiates the communication, this is probably not an issue with firewalls or listening ports.

can you give this a try.

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 /usr/local/nagios/libexec/check_nrpe -H xx.xx.xx.xx 

where xx.xx.xx.xx is the ip address of you nsclient machine.

also, the location of check_nrpe may be different if you compiled from source, but it should be in the same location as check_ping which you've been using.

Thanks,

-Yancy

[DiegoAnjos]

hum... thanks yancy for you help.

In fact I do not have check_nrpe on libexec folder:

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srvnagios:/usr/local/nagios/libexec# ./check_nrpe -H XX.XX.XX.XX
-bash: ./check_nrpe: No such file or directory

but I gave a try of check_ping and...

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srvnagios:/usr/local/nagios/libexec# ./check_ping -H XX.XX.X.X -w 3000.0,80% -c 5000.0,100% -p 5
PING OK - Packet loss = 0%, RTA = 0.47 ms|rta=0.471000ms;3000.000000;5000.000000;0.000000 pl=0%;80;100;0

I compiled Nagios from source, following the "Quickstart Guide" from Nagios website.

I have other plugins on libexec folder:

• check_apt check_flexlm check_mailq check_ping check_udp
  check_breeze check_ftp check_mrtg check_pop check_ups
  check_by_ssh check_hpjd check_mrtgtraf check_procs check_users
  check_clamd check_http check_nagios check_real check_wave
  check_cluster check_icmp check_nntp check_rpc negate
  check_dhcp check_ide_smart check_nt check_sensors urlize
  check_dig check_ifoperstatus check_ntp check_smtp utils.pm
  check_disk check_ifstatus check_ntp_peer check_snmp utils.sh
  check_disk_smb check_imap check_ntp_time check_ssh
  check_dns check_ircd check_nwstat check_swap
  check_dummy check_load check_oracle check_tcp
  check_file_age check_log check_overcr check_time

How can I install "check_nrpe"?

[yancy]

DiegoAnjos,

sounds like you need to also compile the plugins.

plugins can be found here:
http://www.nagios.org/download/plugins


-Yancy