Nagios XI - STRICT_TRANS

Overview

This KB article is about the MySQL / MariaDB database and adjusting the STRICT_TRANS_TABLES setting.

As of [MySQL 5.7.5] and [MariaDB 10.2.4] the STRICT_TRANS_TABLES mode is enabled by default. When this is enabled it causes database changes to be rolled back if they do not meet strict requirements. This causes problems with Nagios XI and how it saves it's data to the database.

Nagios XI requires the STRICT_TRANS_TABLES to be disabled, this KB article instructs you on how to do this.

The steps in this KB article need to be applied to your database server. Normally this is your Nagios XI server however if you have offloaded the databases to an external server then the commands need to be executed on that server.

Change Setting

Establish a terminal session to your Nagios XI server and execute the following command to open the database client:

mysql -u root -pnagiosxi

Execute these command to determine if the setting is currently disabled:

use nagiosql;
SELECT @@SQL_MODE, @@GLOBAL.SQL_MODE\G;

The output will be something like this:

*************************** 1. row ***************************
       @@SQL_MODE: STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
@@GLOBAL.SQL_MODE: STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
1 row in set (0.00 sec)

You can see from the output above that the setting STRICT_TRANS_TABLES exists, this means is it enabled.

To disable the setting execute the following commands:

SET @@SQL_MODE = REPLACE(@@SQL_MODE,'STRICT_TRANS_TABLES', '');
SET @@GLOBAL.SQL_MODE = REPLACE(@@GLOBAL.SQL_MODE,'STRICT_TRANS_TABLES', '');
SELECT @@SQL_MODE, @@GLOBAL.SQL_MODE\G;

The output should be something like:

MariaDB [nagiosql]> SET @@SQL_MODE = REPLACE(@@SQL_MODE,'STRICT_TRANS_TABLES', '');
Query OK, 0 rows affected (0.00 sec)

MariaDB [nagiosql]> SET @@GLOBAL.SQL_MODE = REPLACE(@@GLOBAL.SQL_MODE,'STRICT_TRANS_TABLES', '');
Query OK, 0 rows affected (0.00 sec)

MariaDB [nagiosql]> SELECT @@SQL_MODE, @@GLOBAL.SQL_MODE\G;
*************************** 1. row ***************************
       @@SQL_MODE: ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
@@GLOBAL.SQL_MODE: ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
1 row in set (0.00 sec)

You can see from the output above that the STRICT_TRANS_TABLES setting no longer exists, this means it is disabled.

This completes the changes required to disable the STRICT_TRANS_TABLES setting. You can now exit the database client with:

quit;

You will also need to remove STRICT_TRANS_TABLES in the MySQL / MariaDB my.cnf configuration file.

The first step is to stop the required services on your Nagios XI server:

systemctl stop nagios.service
systemctl stop ndo2db.service

The next step is to edit the my.cnf configuration file on your MySQL / MariaDB database server. Establish a terminal session to your database server and edit the my.cnf file by executing the following command:

RHEL7 | CentOS7 | Oracle Linux7

vi /etc/my.cnf

RHEL8 | CentOS8 | Centos Stream

vi /etc/my.cnf.d/mysql-server.cnf

Ubuntu 16/18/20

vi /etc/mysql/mysql.conf.d/mysqld.cnf

Debian 9

vi /etc/mysql/mariadb.conf.d/50-server.cnf

When using the vi editor, to make changes press i on the keyboard first to enter insert mode. Press Esc to exit insert mode.

Locate the [mysqld] section and locate the sql_mode already defined:

[mysqld]
# Recommended in standard MySQL setup
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES

Remove the STRICT_TRANS_TABLES in the line so it looks similar as follows:

[mysqld]
sql_mode=NO_ENGINE_SUBSTITUTION

When you have finished, save the changes in vi by typing:

:wq

and press Enter.

You now need to restart the database service:

RHEL 7 | CentOS 7 | Oracle Linux 7 | Debian 9

systemctl restart mariadb.service

RHEL 8 | CentOS 8 | Centos Stream

systemctl restart mysqld.service

Debian 8 | Ubuntu 16/18/20

systemctl restart mysql.service

You now need to start the Nagios services:

RHEL 7 | CentOS 7 | Oracle Linux 7 | Debian | Ubuntu 16/18/20

systemctl start ndo2db.service 
systemctl start nagios.service

RHEL 8 | CentOS 8 | Centos Stream

systemctl start nagios.service

Final Thoughts

For any support related questions please visit the Nagios Support Forums at:

http://support.nagios.com/forum/

Nagios XI - STRICT_TRANS_TABLES

Overview