<strong>xi</strong> 5.8.6 NDO - Nagios Support Forum

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<strong>xi</strong> 5.8.6 NDO - Nagios Support Forum

xi 5.8.6 NDO

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andyb4u: Posts: 114; Joined: Tue Aug 15, 2017 1:58 am

xi 5.8.6 NDO

Post by andyb4u » Wed Sep 29, 2021 3:39 am

Hi,

We are currently running xi 5.8.1, with offloaded databases and Mod-Gearman. When we upgraded to xi 5.8.1 we experienced an issue with NDO3 and were advised by Nagios support to downgrade NDO3 to ndomod via support call #532639 which we did.

We are beginning to look at upgrading to 5.8.6 to fix security vulnerabilities.

Have the issues with NDO3 been resolved since 5.8.1?

What would the be the recommended approach to upgrade xi if it has not been fully resolved? I can't find any reference to NDO in the upgrade instructions pdf online.

Thanks,
Andy

benjaminsmith: Posts: 5324; Joined: Wed Aug 22, 2018 4:39 pm; Location: saint paul

Re: xi 5.8.6 NDO

Post by benjaminsmith » Wed Sep 29, 2021 9:23 am

HI Andy,

There were some important updates to NDO3 in the 5.8.5 release. The upgrade script will not force an upgrade downgraded ndo systems, so you can upgrade to the latest version without impacting the backend database (ndo).

Do you have a test system set up to try out the latest version of NDO3 without affecting the production monitoring server? That would be the recommend approached here as the system has had some customization.

--Benjamin

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andyb4u: Posts: 114; Joined: Tue Aug 15, 2017 1:58 am

Re: xi 5.8.6 NDO

Post by andyb4u » Thu Sep 30, 2021 2:04 am

Hi Benjamin,

We have a test system but it is very small compared to our live system. It was only in our larger live system that we experienced the problem with NDO3.

Are there any occurrences of people seeing issues with large installations and NDO3 in xi 5.8.6?

I also need to ask if xi 5.8.6 is fully compatible with Mod-Gearman v3.0.7?

Thanks,
Andy

benjaminsmith: Posts: 5324; Joined: Wed Aug 22, 2018 4:39 pm; Location: saint paul

Re: xi 5.8.6 NDO

Post by benjaminsmith » Thu Sep 30, 2021 1:36 pm

Hi,

For the first question, not necessarily. If you did not have an issue with exceeding the kernel message queues, then using ndo2db is a good option.

You can upgrade to NDO3 and then check the nagios.log for any errors. In most cases, those can be resolved those by examining the database table settings. I can provide steps for upgrading to ndo3 if you'd like.

That's correct, the latest version will work with v3.0.7.

See: Integrating Mod-Gearman With Nagios xi

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andyb4u: Posts: 114; Joined: Tue Aug 15, 2017 1:58 am

Re: xi 5.8.6 NDO

Post by andyb4u » Wed Oct 06, 2021 5:06 am

Hi,

Yes if you can provide the steps to upgrade to ndo3 that would be good.

Are the steps to downgrade to ndo2db if needed still the same as we were provided with in the support ticket?

benjaminsmith: Posts: 5324; Joined: Wed Aug 22, 2018 4:39 pm; Location: saint paul

Re: xi 5.8.6 NDO

Post by benjaminsmith » Wed Oct 06, 2021 3:22 pm

Hi,

To upgrade back to ndo3, download you version of Nagios xi, and unpack the archive and run the upgrade command.

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cd /tmp
rm -rf /tmp/nagiosxi
wget https://assets.nagios.com/downloads/nagiosxi/5/xi-latest.tar.gz
tar xzf xi-latest.tar.gz
cd nagiosxi/subcomponents/ndo
./upgrade -f

Yes, the same steps to downgrade will work. For a system with a local database, they are:

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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:

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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 services:

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systemctl start nagios
systemctl start ndo2db

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Be sure to check out our Knowledgebase for helpful articles and solutions!

andyb4u: Posts: 114; Joined: Tue Aug 15, 2017 1:58 am

Re: xi 5.8.6 NDO

Post by andyb4u » Tue Nov 16, 2021 9:16 am

Hi,

I've come back to looking at this. I tried upgrading ndo2db to ndo3 on a test server.

The upgrade appeared to work but ndo3 doesn't seem to start correctly when the server is rebooted.

The /usr/local/nagios/var/nagios.log shows:

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[1637070498] Local time is Tue Nov 16 13:48:18 GMT 2021
[1637070498] LOG VERSION: 2.0
[1637070498] qh: Socket '/usr/local/nagios/var/rw/nagios.qh' successfully initialized
[1637070498] qh: core query handler registered
[1637070498] qh: echo service query handler registered
[1637070498] qh: help for the query handler registered
[1637070498] wproc: Successfully registered manager as @wproc with query handler
[1637070498] wproc: Registry request: name=Core Worker 1269;pid=1269
[1637070498] wproc: Registry request: name=Core Worker 1268;pid=1268
[1637070498] wproc: Registry request: name=Core Worker 1267;pid=1267
[1637070498] wproc: Registry request: name=Core Worker 1270;pid=1270
[1637070498] NDO-3: NDO 3.0.7 (c) Copyright 2009-2020 Nagios - Nagios Core Development Team
[1637070499] NDO-3: Unable to connect to mysql. Configuration may be incorrect or database may have temporarily disconnected.
[1637070499] NDO-3: NDO was not able to initialize the database (main context) and will not start.
[1637070499] Event broker module '/usr/local/nagios/bin/ndo.so' initialized successfully.
[1637070499] mod_gearman: initialized version 3.0.7 (libgearman 0.33)
[1637070499] Event broker module '/usr/lib64/mod_gearman/mod_gearman_nagios4.o' initialized successfully.
[1637070505] Successfully launched command file worker with pid 2618

A manual restart of the nagios service then kicks it back into life:

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systemctl restart nagios

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[1637071832] Local time is Tue Nov 16 14:10:32 GMT 2021
[1637071832] LOG VERSION: 2.0
[1637071832] qh: Socket '/usr/local/nagios/var/rw/nagios.qh' successfully initialized
[1637071832] qh: core query handler registered
[1637071832] qh: echo service query handler registered
[1637071832] qh: help for the query handler registered
[1637071832] wproc: Successfully registered manager as @wproc with query handler
[1637071832] wproc: Registry request: name=Core Worker 9982;pid=9982
[1637071832] wproc: Registry request: name=Core Worker 9983;pid=9983
[1637071832] wproc: Registry request: name=Core Worker 9984;pid=9984
[1637071832] wproc: Registry request: name=Core Worker 9985;pid=9985
[1637071832] NDO-3: NDO 3.0.7 (c) Copyright 2009-2020 Nagios - Nagios Core Development Team
[1637071832] NDO-3: Callbacks registered
[1637071832] NDO-3: Callbacks registered
[1637071832] Event broker module '/usr/local/nagios/bin/ndo.so' initialized successfully.
[1637071832] mod_gearman: initialized version 3.0.7 (libgearman 0.33)
[1637071832] Event broker module '/usr/lib64/mod_gearman/mod_gearman_nagios4.o' initialized successfully.
[1637071832] NDO-3: Started event_handler thread
[1637071832] NDO-3: Started timed_event thread
[1637071832] NDO-3: Started host_check thread
[1637071832] NDO-3: Started service_check thread
[1637071832] NDO-3: Started comment thread
[1637071832] NDO-3: Started downtime thread
[1637071832] NDO-3: Started flapping thread
[1637071832] NDO-3: Started service_status thread
[1637071832] NDO-3: Started host_status thread
[1637071832] NDO-3: Started contact_status thread
[1637071832] NDO-3: Started acknowledgement thread
[1637071832] NDO-3: Started statechange thread
[1637071832] NDO-3: Started notification thread
[1637071833] NDO-3: Ended contact_status thread
[1637071833] NDO-3: Ended host_check thread
[1637071833] NDO-3: Ended host_status thread
[1637071833] NDO-3: Ended service_check thread
[1637071833] NDO-3: Ended flapping thread
[1637071833] NDO-3: Ended statechange thread
[1637071833] NDO-3: Ended acknowledgement thread
[1637071833] NDO-3: Ended downtime thread
[1637071833] NDO-3: Ended timed_event thread
[1637071833] NDO-3: Ended notification thread
[1637071833] NDO-3: Ended event_handler thread
[1637071833] NDO-3: Ended comment thread
[1637071833] NDO-3: Ended service_status thread
[1637071838] Successfully launched command file worker with pid 10018

Do you have any way to troubleshoot why it won't start after a reboot?

ssax: Dreams In Code; Posts: 7682; Joined: Wed Feb 11, 2015 12:54 pm

Re: xi 5.8.6 NDO

Post by ssax » Tue Nov 16, 2021 5:51 pm

The only thing I can think is that the nagios service is starting up before the database is fully started.

What is the output of these commands:

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systemctl status nagios | head -9
cat /usr/lib/systemd/system/nagios.service
uname -a
cat /etc/*release

andyb4u: Posts: 114; Joined: Tue Aug 15, 2017 1:58 am

Re: xi 5.8.6 NDO

Post by andyb4u » Wed Nov 17, 2021 4:56 am

This is the output of the commands after a reboot of the server:

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systemctl status nagios | head -9
● nagios.service - LSB: Starts and stops the Nagios monitoring server
   Loaded: loaded (/etc/rc.d/init.d/nagios; bad; vendor preset: disabled)
   Active: active (running) since Wed 2021-11-17 09:29:21 GMT; 5min ago
     Docs: man:systemd-sysv-generator(8)
  Process: 1078 ExecStart=/etc/rc.d/init.d/nagios start (code=exited, status=0/SUCCESS)
   CGroup: /system.slice/nagios.service
           ├─1360 /usr/local/nagios/bin/nagios -d /usr/local/nagios/etc/nagios.cfg
           ├─1369 /usr/local/nagios/bin/nagios --worker /usr/local/nagios/var/rw/nagios.qh
           ├─1370 /usr/local/nagios/bin/nagios --worker /usr/local/nagios/var/rw/nagios.qh

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cat /usr/lib/systemd/system/nagios.service
cat: /usr/lib/systemd/system/nagios.service: No such file or directory

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uname -a
Linux TESTSERVER 3.10.0-514.26.2.el7.x86_64 #1 SMP Tue Jul 4 15:04:05 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

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CentOS Linux release 7.3.1611 (Core)
NAME="CentOS Linux"
VERSION="7 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="7"
PRETTY_NAME="CentOS Linux 7 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:7"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"

CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="7"

CentOS Linux release 7.3.1611 (Core)

pbroste: Posts: 1288; Joined: Tue Jun 01, 2021 1:27 pm

Re: xi 5.8.6 NDO

Post by pbroste » Wed Nov 17, 2021 4:58 pm

Hello @andyb4u

Thanks for following up, want to go ahead and verify @ssax's thoughts that the 'nagios.service' is starting up before database and ndo-3 get settled in by putting in a delay with xx seconds:

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vi /etc/systemd/system/multi-user.target.wants/nagios.service

[Unit]
Description=Nagios Core 4.4.6
Documentation=https://www.nagios.org/documentation
After=network.target local-fs.target mysqld.service

[Service]
Type=forking
ExecStartPre=/bin/sleep 15
ExecStartPre=/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
ExecStart=/usr/local/nagios/bin/nagios -d /usr/local/nagios/etc/nagios.cfg
ExecStop=/usr/bin/kill -s TERM ${MAINPID}
ExecStopPost=/usr/bin/rm -f /usr/local/nagios/var/rw/nagios.cmd
ExecReload=/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
ExecReload=/usr/bin/kill -s HUP ${MAINPID}

[Install]
WantedBy=multi-user.target

Then run:

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systemctl daemon-reload

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systemctl restart nagios

Please make sure that you make a backup before making changes to the systemd.

Thanks,
Perry

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