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Nagios migration to new Linux server – How we do it

by | Feb 15, 2021

Nagios migration to a new Linux server involves transferring all the existing data, defined hosts, services, email alert scripts, and Pnp4nagios data.

After the migration, we need to update/add the clients with the IP of the new server, so that both Nagios get alerts.

Finally, once we are comfortable with a new migration, we can decommission the old one.

Here at Bobcares, we often get requests from our customers to migrate Nagios to a new Linux server as part of our Server Management Services.

Today, let’s see how our Support Engineers migrate the Nagios tool to another server.


Nagios migration to new Linux server

Usually, many customers approach us to migrate the Nagios from one Linux server to another Linux server.

Now let’s see how our Support Engineers help the customers to migrate Nagios to a new Linux server.

1. First, we install fresh CentOS Linux on a new server and configure the required services.

2. After that, we proceed with the installation of Nagios Core and its dependencies.

We also ensure that Nagios Core is running.

3. Thereafter, we proceed with transferring configuration files of Nagios. It mainly includes Nagios configuration files and Nagios Apache configuration files.


Nagios configuration files in Linux server

Main configuration files: $NAGIOS_HOME/etc/*.cfg
Host and services configuration files: $NAGIOS_HOME/etc/objects/*.cfg
Alert scripts: (if any customized email alerts b – for alert scripts used check-in commands.cfg and search for notification commands)

Here is the command that we run to transfer Nagios configuration files to the new server.

[[email protected] ~]# scp /usr/local/nagios/etc/*.cfg testserver:/usr/local/nagios/etc/

[[email protected] ~]# scp /usr/local/nagios/etc/objects/*.cfg testserver:/usr/local/nagios/etc/objects/


Nagios Apache configuration in Linux server

HTTP configuration file: /etc/httpd/conf.d/nagios.conf

Here is the command that we run to transfer Nagios Apache configuration files to the new server.

[[email protected] ~]# scp /etc/httpd/conf.d/nagios.conf testserver:/etc/httpd/conf.d/

4. Then we check whether the Nagios configuration is proper or not, by running the below command.

[[email protected] ~]# /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

If the prompt then ends with the following, then it indicates that the migration is proper.

Total Warnings: 0
Total Errors: 0

5. If there is any Pnp4nagios data migration, we will assist you. PNP4Nagios is one such external program in which Nagios pass the performance data to an external program that can store that data for later analysis as Nagios Core does not have its own performance data engine built in to process this performance data.

6. Then we change the IP address configuration of both servers.

For the newly installed and configured Nagios Linux server, we give the address of the old Nagios server and vice versa!

7. Finally, we reboot both machines and ensure the new Nagios server is working well.

[Need any assistance with Nagios migration? – We’ll help you]



Today, we saw how our Support Engineers helped our customers in migrating the Nagios server to a new Linux server.


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