diff --git a/sources/tech/20191104 How to Add Windows and Linux host to Nagios Server for Monitoring.md b/sources/tech/20191104 How to Add Windows and Linux host to Nagios Server for Monitoring.md new file mode 100644 index 0000000000..6f49e48f98 --- /dev/null +++ b/sources/tech/20191104 How to Add Windows and Linux host to Nagios Server for Monitoring.md @@ -0,0 +1,308 @@ +[#]: collector: (lujun9972) +[#]: translator: ( ) +[#]: reviewer: ( ) +[#]: publisher: ( ) +[#]: url: ( ) +[#]: subject: (How to Add Windows and Linux host to Nagios Server for Monitoring) +[#]: via: (https://www.linuxtechi.com/add-windows-linux-host-to-nagios-server/) +[#]: author: (James Kiarie https://www.linuxtechi.com/author/james/) + +How to Add Windows and Linux host to Nagios Server for Monitoring +====== + +In the previous article, we demonstrated how to install [Nagios Core on CentOS 8 / RHEL 8][1] server. In this guide, we will dive deeper and add Linux and Windows hosts to the Nagios Core server for monitoring. + +![Add-Linux-Windows-Host-Nagios-Server][2] + +### Adding a Remote Windows Host to Nagios Server + +In this section, you will learn how to add a **Windows host** system to the **Nagios server**. For this to be possible, you need to install **NSClient++** agent on the Windows Host system. In this guide, we are going to install the NSClient++ on a Windows Server 2019 Datacenter edition. + +On the Windows host system,  head out to the download link as specified and download NSClient ++ agent. + +Once downloaded, double click on the downloaded installation file to launch the installation wizard. + +[![NSClient-installer-Windows][2]][3] + +On the first step on the installation procedure click ‘**Next**’ + +[![click-nex-to-install-NSClient][2]][4] + +In the next section, check off the ‘**I accept the terms in the license Agreement**’ checkbox and click ‘**Next**’ + +[![Accept-terms-conditions-NSClient][2]][5] + +Next, click on the ‘**Typical**’ option from the list of options and click ‘**Next**’ + +[![click-on-Typical-option-NSClient-Installation][2]][6] + +In the next step, leave the default settings as they are and click ‘**Next**’. + +[![Define-path-NSClient-Windows][2]][7] + +On the next page, specify your Nagios Server core’s IP address and tick off all the modules and click ‘**Next**’ as shown below. + +[![Specify-Nagios-Server-IP-address-NSClient-Windows][2]][8] + +Next, click on the ‘**Install**’ option to commence the installation process.[![Click-install-to-being-the-installation-NSClient][2]][9] + +The installation process will start and will take a couple of seconds to complete. On the last step. Click ‘**Finish**’ to complete the installation and exit the Wizard. + +[![Click-finish-NSClient-Windows][2]][10] + +To start the NSClient service, click on the **Start** menu and click on the ‘**Start NSClient ++**’ option. + +[![Click-start-NSClient-service-windows][2]][11] + +To confirm that indeed the service is running, press **Windows Key + R**, type services.msc and hit **ENTER**. Scroll and search for the **NSClient** service and ensure it’s running + +[![NSClient-running-windows][2]][12] + +At this point, we have successfully installed NSClient++ on Windows Server 2019 host and verified that it’s running. + +### Configure Nagios Server to monitor Windows host + +After the successful installation of the NSClient ++ on the Windows host PC, log in to the Nagios server Core system and configure it to monitor the Windows host system. + +Open the windows.cfg file using your favorite text editor + +``` +# vim /usr/local/nagios/etc/objects/windows.cfg +``` + +In the configuration file, ensure that the host_name attribute matches the hostname of your Windows client system. In our case, the hostname for the Windows server PC is windows-server. This hostname should apply for all the host_name attributes. + +For the address attribute, specify your Windows host IP address. , In our case, this was 10.128.0.52. + +![Specify-hostname-IP-Windows][2] + +After you are done, save the changes and exit the text editor. + +Next, open the Nagios configuration file. + +``` +# vim /usr/local/nagios/etc/nagios.cfg +``` + +Uncomment the line below and save the changes. + +cfg_file=/usr/local/nagios/etc/objects/windows.cfg + +![Uncomment-Windows-cfg-Nagios][2] + +Finally, to verify that Nagios configuration is free from any errors, run the command: + +``` +# /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg +``` + +Output + +![Verify-configuration-for-errors-Nagios][2] + +As you can see from the output, there are no warnings or errors. + +Now browse your Nagios Server IP address, log in and click on Hosts. Your Windows hostname, in this case, windows-server will appear on the dashboard. + +![Windows-Host-added-Nagios][2] + +### Adding a remote Linux Host to Nagios Server + +Having added a Windows host to the Nagios server, let’s add a Linux host system. In our case, we are going to add a **Ubuntu 18.04 LTS** to the Nagios monitoring server. To monitor a Linux host, we need to install an agent on the remote Linux system called **NRPE**. NRPE is short for **Nagios Remote Plugin Executor**. This is the plugin that will allow you to monitor Linux host systems. It allows you to monitor resources such as Swap, memory usage, and CPU load to mention a few on remote Linux hosts. So the first step is to install NRPE on Ubuntu 18.04 LTS remote system. + +But first, update Ubuntu system + +``` +# sudo apt update +``` + +Next,  install Nagios NRPE by running the command as shown: + +``` +# sudo apt install nagios-nrpe-server nagios-plugins +``` + +![Install-nrpe-server-nagios-plugins][2] + +After the successful installation of  NRPE and Nagios plugins, configure NRPE by opening its configuration file in /etc/nagios/nrpe.cfg + +``` +# vim /etc/nagios/nrpe.cfg +``` + +Append the Linux host IP address to the **server_address** attribute. In this case, 10.128.0.53 is the IP address of the Ubuntu 18.04 LTS system. + +![Specify-server-address-Nagios][2] + +Next, add Nagios server IP address in the ‘allowed_hosts’ attribute, in this case, 10.128.0.50 + +![Allowed-hosts-Nagios][2] + +Save and exit the configuration file. + +Next, restart NRPE service and verify its status + +``` +# systemctl restart nagios-nrpe-server +# systemctl enable nagios-nrpe-server +# systemctl status nagios-nrpe-server +``` + +![Restart-nrpe-check-status][2] + +### Configure Nagios Server to monitor Linux host + +Having successfully installed NRPE and nagios plugins on the remote linux server, log in to Nagios Server and install EPEL (Extra packages for Enterprise Linux) package. + +``` +# dnf install https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm +``` + +Next, install NRPE plugin on the server + +``` +# dnf install nagios-plugins-nrpe -y +``` + +After the installation of the NRPE plugin, open the Nagios configuration file “/usr/local/nagios/etc/nagios.cfg” + +``` +# vim /usr/local/nagios/etc/nagios.cfg +``` + +Next, uncomment the line below in the configuration file + +cfg_dir=/usr/local/nagios/etc/servers + +![uncomment-servers-line-Nagios-Server-CentOS8][2] + +Next, create a configuration directory + +``` +# mkdir /usr/local/nagios/etc/servers +``` + +Then create client configuration file + +``` +# vim /usr/local/nagios/etc/servers/ubuntu-host.cfg +``` + +Copy and paste the configuration below to the file. This configuration monitors swap space, system load, total processes, logged in users, and disk usage. + +``` +define host{ + use linux-server + host_name ubuntu-nagios-client + alias ubuntu-nagios-client + address 10.128.0.53 + +} + +define hostgroup{ + hostgroup_name linux-server + alias Linux Servers + members ubuntu-nagios-client +} + +define service{ + use local-service + host_name ubuntu-nagios-client + service_description SWAP Uasge + check_command check_nrpe!check_swap + +} + +define service{ + use local-service + host_name ubuntu-nagios-client + service_description Root / Partition + check_command check_nrpe!check_root + +} + +define service{ + use local-service + host_name ubuntu-nagios-client + service_description Current Users + check_command check_nrpe!check_users +} + +define service{ + use local-service + host_name ubuntu-nagios-client + service_description Total Processes + check_command check_nrpe!check_total_procs +} + +define service{ + use local-service + host_name ubuntu-nagios-client + service_description Current Load + check_command check_nrpe!check_load +} +``` + +Save and exit the configuration file. + +Next, verify that there are no errors in Nagios configuration + +``` +# /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg +``` + +Now restart Nagios service and ensure that it is up and running. + +``` +# systemctl restart nagios +``` + +Remember to open port 5666 which is used by NRPE plugin on the firewall of the Nagios server. + +``` +# firewall-cmd --permanent --add-port=5666/tcp +# firewall-cmd --reload +``` + +![Allow-firewall-Nagios-server][2] + +Likewise, head out to your Linux host (Ubuntu 18.04 LTS) and allow the port on UFW firewall + +``` +# ufw allow 5666/tcp +# ufw reload +``` + +![Allow-NRPE-service][2] + +Finally, head out to the Nagios Server’s URL and click on ‘**Hosts**’. Your Ubuntu system will be displayed on the dashboard alongside the Windows host machine we added earlier on. + +![Linux-host-added-monitored-Nagios][2] + +And this wraps up our 2-part series on Nagios installation and adding remote hosts. Feel free to get back to us with your feedback. + +-------------------------------------------------------------------------------- + +via: https://www.linuxtechi.com/add-windows-linux-host-to-nagios-server/ + +作者：[James Kiarie][a] +选题：[lujun9972][b] +译者：[译者ID](https://github.com/译者ID) +校对：[校对者ID](https://github.com/校对者ID) + +本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出 + +[a]: https://www.linuxtechi.com/author/james/ +[b]: https://github.com/lujun9972 +[1]: https://www.linuxtechi.com/install-nagios-core-rhel-8-centos-8/ +[2]: data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7 +[3]: https://www.linuxtechi.com/wp-content/uploads/2019/11/NSClient-installer-Windows.jpg +[4]: https://www.linuxtechi.com/wp-content/uploads/2019/11/click-nex-to-install-NSClient.jpg +[5]: https://www.linuxtechi.com/wp-content/uploads/2019/11/Accept-terms-conditions-NSClient.jpg +[6]: https://www.linuxtechi.com/wp-content/uploads/2019/11/click-on-Typical-option-NSClient-Installation.jpg +[7]: https://www.linuxtechi.com/wp-content/uploads/2019/11/Define-path-NSClient-Windows.png +[8]: https://www.linuxtechi.com/wp-content/uploads/2019/11/Specify-Nagios-Server-IP-address-NSClient-Windows.jpg +[9]: https://www.linuxtechi.com/wp-content/uploads/2019/11/Click-install-to-being-the-installation-NSClient.jpg +[10]: https://www.linuxtechi.com/wp-content/uploads/2019/11/Click-finish-NSClient-Windows.jpg +[11]: https://www.linuxtechi.com/wp-content/uploads/2019/11/Click-start-NSClient-service-windows.jpg +[12]: https://www.linuxtechi.com/wp-content/uploads/2019/11/NSClient-running-windows.jpg