Nagios Support Forum

Posted: **Wed Mar 17, 2021 7:07 am**

Hello dchurch,
We executed the commands provided by you . We found nagios was not running today.
root@nagiosxidevenv:[~]: systemctl status nagios
● nagios.service - LSB: Starts and stops the Nagios monitoring server
Loaded: loaded (/etc/rc.d/init.d/nagios; bad; vendor preset: disabled)
Active: active (exited) since Tue 2021-03-16 11:52:35 EDT; 14h ago
Docs: man:systemd-sysv-generator(8)
Process: 14754 ExecStop=/etc/rc.d/init.d/nagios stop (code=exited, status=0/SUCCESS)
Process: 17164 ExecStart=/etc/rc.d/init.d/nagios start (code=exited, status=0/SUCCESS)
Tasks: 0

Mar 17 00:13:30 nagiosxidevenv.ux.corp.local nagios[17197]: wproc: Core Worker 17225: job 40292032 with pid 6846 reaped at timeout. timeouts=2; started=690
Mar 17 00:13:30 nagiosxidevenv.ux.corp.local nagios[17197]: wproc: Core Worker 17225: job 628 (pid=6851) timed out. Killing it
Mar 17 00:13:30 nagiosxidevenv.ux.corp.local nagios[17197]: wproc: GLOBAL HOST EVENTHANDLER job 628 from worker Core Worker 17225 is a non-check helper but exited with return code 1
Mar 17 00:13:30 nagiosxidevenv.ux.corp.local nagios[17208]: job 640 (pid=7902): read() returned error 11
Mar 17 00:13:30 nagiosxidevenv.ux.corp.local nagios[17197]: wproc: early_timeout=0; exited_ok=1; wait_status=256; error_code=0;
Mar 17 00:13:30 nagiosxidevenv.ux.corp.local nagios[17197]: wproc: stdout line 01: UNABLE TO CONNECT TO DB - EXITING!
Mar 17 00:13:30 nagiosxidevenv.ux.corp.local nagios[17197]: wproc: Core Worker 17225: job 40324400 with pid 6851 reaped at timeout. timeouts=3; started=690
Mar 17 00:13:30 nagiosxidevenv.ux.corp.local nagios[17197]: wproc: Core Worker 17225: job 629 (pid=6856) timed out. Killing it
Mar 17 00:13:30 nagiosxidevenv.ux.corp.local nagios[17197]: wproc: GLOBAL HOST EVENTHANDLER job 629 from worker Core Worker 17225 timed out after 43.77s
Mar 17 00:14:04 nagiosxidevenv.ux.corp.local nagios[17197]: Caught SIGSEGV, shutting down...
root@nagiosxidevenv:[~]:

Best Regards,
Bsanjay

Posted: **Wed Mar 17, 2021 4:15 pm**

We've been having issues with NDO3 causing Nagios to segfault. We're still working on finding the root cause. The recommended remediation is to downgrade to NDO2DB for the time being.

STANDARD DOWNGRADE OF NDO3

Code: Select all

systemctl stop nagios
cd /tmp
rm -rf /tmp/nagiosxi
wget https://assets.nagios.com/downloads/nagiosxi/5/xi-5.6.14.tar.gz
tar zxf xi-5.6.14.tar.gz
cd /tmp/nagiosxi/subcomponents/ndoutils
./install
systemctl enable ndo2db

Then edit your /usr/local/nagios/etc/nagios.cfg and make sure this line is uncommented:

Code: Select all

broker_module=/usr/local/nagios/bin/ndomod.o config_file=/usr/local/nagios/etc/ndomod.cfg

Make sure this line is commented:

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#broker_module=/usr/local/nagios/bin/ndo.so /usr/local/nagios/etc/ndo.cfg

Then start the nagios service:

Code: Select all

systemctl start nagios

********************************************************************************

DOWNGRADE NDO WITH OFFLOADED DB

Code: Select all

service nagios stop
cd /tmp
rm -rf /tmp/nagiosxi
wget https://assets.nagios.com/downloads/nagiosxi/5/xi-5.6.14.tar.gz
tar zxf xi-5.6.14.tar.gz
cd /tmp/nagiosxi

If you have an offloaded DB you'll need to do these things:

Edit /tmp/nagiosxi/xi-sys.cfg and update 'mysqlpass' value.
Edit /tmp/nagiosxi/subcomponents/ndoutils/mods/cfg/ndo2db.cfg and update 'db_host', 'db_user', and 'db_pass' values.
Edit /tmp/nagiosxi/subcomponents/ndoutils/install and /tmp/nagiosxi/subcomponents/ndoutils/post-install to update all calls to mysql to include -h <db_ip>

Then continue as normal.

Code: Select all

cd /tmp/nagiosxi/subcomponents/ndoutils
./install
systemctl enable ndo2db
service ndo2db start

Then edit your /usr/local/nagios/etc/nagios.cfg and make sure this line is uncommented:

Code: Select all

broker_module=/usr/local/nagios/bin/ndomod.o config_file=/usr/local/nagios/etc/ndomod.cfg

Make sure this line is commented:

Code: Select all

#broker_module=/usr/local/nagios/bin/ndo.so /usr/local/nagios/etc/ndo.cfg

Then start the nagios service:

Code: Select all

systemctl start nagios

Posted: **Thu Mar 18, 2021 10:41 am**

Hello dchurch,
I checked the ndo version and it shows below 3 version. Please find the screenshot attached. Do let me know if there is some other way to check the NDO version.

Best Regards,
bsanjay

Posted: **Thu Mar 18, 2021 2:11 pm**

bsanjay wrote:I checked the ndo version and it shows below 3 version.

First, that's not what it shows in your screenshot.

Second, did you run into any issues downgrading from NDO3 to NDO2DB?

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