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Nagios Log Server - Cluster Timezone Settings

Overview

Nagios Log Server needs the system and all of it's components to be configured with the correct timezone.

This article explains how to configure the timezone and also explains all the components and how to check them.

 

 

Setting The Cluster Timezone

  • Log into Nagios Log Server

  • In the top menu bar click Admin

  • Under General click Global Settings

  • Here you can define the Cluster Timezone

    • If it is not set correctly, select the desired timezone and click Save Settings

 

The remaining steps will show you all the areas where the timezone settings are defined. We will use America/Los_Angeles for this KB article, but be mindful that you must substitute your actual country/city. You will need to establish a terminal session to a Nagios Log Server node as a root user. You should verify all the nodes are correct by executing all the commands on all the nodes.

 

 

Editing Files

In steps of this article you will be required to edit files. This documentation will use the vi text editor. When using the vi
editor:

  • To make changes press i on the keyboard first to enter insert mode
  • Press Esc to exit insert mode
  • When you have finished, save the changes in vi by typing :wq and press Enter

 

 

Verify The System Timezone

RHEL 6 | CentOS 6

The Linux Operating System default timezone files are located at:

/usr/share/zoneinfo/

 

The timezones are listed by country/city and include daylight savings time adjustments. The current and working system's time zone file is located at /etc/localtime and must be replaced with your zoneinfo.

The following command will copy the timezone file to /etc/localtime:

cp /usr/share/zoneinfo/America/Los_Angeles /etc/localtime

 

Alternatively you could create a symbolic link to the file instead, but symbolic links between /usr and /etc are no popular with POSIX purists. The steps for creating a symbolic link is as follows:

rm -f /etc/localtime
ln -s /usr/share/zoneinfo/America/Los_Angeles /etc/localtime

 

You will also need to set the ZONE directive in /etc/sysconfig/clock. The following command will open the file in the vi text editor:

vi /etc/sysconfig/clock

 

Change or add the following line within your timezone:

ZONE="America/Los_Angeles"

When you have finished, save the changes.

 

 

RHEL 7 | CentOS 7

The timedatectl command is used to configure the timezone. You can display a list of available timezones with the following command:

timedatectl list-timezones

 

The timezones are listed by country/city and include daylight savings time adjustments. The command above can be piped to the grep command to help search for your timezone, for example:

timedatectl list-timezones | grep Los

 

This will produce the following output:

America/Los_Angeles

 

Then you use the timedatectl command to configure the timezone:

timedatectl set-timezone America/Los_Angeles

 

Running the timedatectl command by itself will produce a summary, which will have the following line:

Time zone: America/Los_Angeles (PST, -0800)

 

 

Debian | Ubuntu

The dpkg-reconfigure command is used to configure the timezone. Use the following command to set the timezone:

dpkg-reconfigure tzdata

 

Select the appropriate region and this completes the required steps.

 

 

PHP Timezone

This change needs to be made to your php.ini file, to determine the location of this file execute the following command:

find /etc -name php.ini

If there are multiple results then the one in the apache directory is the one that needs changing.

 

Change the date.timezone = line to:

date.timezone =  America/Los_Angeles

When you have finished, save the changes.

 

Once the change has been made you will have to restart Apache for the changes to take effect using one of the commands below:

RHEL 6 | CentOS 6

service httpd restart

 

RHEL 7 | CentOS 7

systemctl restart httpd.service

 

Ubuntu 14

service apache2 restart

 

Debian | Ubuntu 16/18

systemctl restart apache2.service

 

 

Restart Logstash

If you manually change any of the timezone settings outside of the GUI interface you will need to restart the logstash service using one of the commands below:

RHEL 6 | CentOS 6 | Oracle Linux 6 | Ubuntu 14

service logstash restart

 

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

systemctl restart logstash.service

 

 

Final Thoughts

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

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

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