--- title: "How to Monitor Hosts With the Linux Icinga Monitoring Tool" description: "Learn how to effectively monitor your entire infrastructure with the Linux Icinga monitoring tool in this step-by-step tutorial!" canonical: "https://adamtheautomator.com/icinga/" --- # How to Monitor Hosts With the Linux Icinga Monitoring Tool > Learn how to effectively monitor your entire infrastructure with the Linux Icinga monitoring tool in this step-by-step tutorial! Source: https://adamtheautomator.com/icinga/ --- ATA Learning Tap to hide [ ATA Learning ](/) * [Home](/) * [Tutorials](/tutorials/) * [Instructors](/author/) * [Advertising](/advertising/) * [Recommended Resources](/resources/) * [About Adam](/about-adam/) Search for: * [](https://twitter.com/adbertram) * [](https://github.com/Adam-the-Automator) * [](https://www.linkedin.com/company/adam-the-automator-llc) * [](/feed/) ![How to Monitor Hosts With the Linux Icinga Monitoring Tool](https://adamtheautomator.com/wp-content/uploads/2022/03/How-to-Monitor-Hosts-With-the-Linux-Icinga-Monitoring-Tool.jpg) # How to Monitor Hosts With the Linux Icinga Monitoring Tool [![](https://secure.gravatar.com/avatar/572a248f516b6d0cd566cb44fdbd9336f30ef95aa0f6d78f118c1f47b1b6d6b7?s=192&d=mm&r=g)Arvid Larson](https://adamtheautomator.com/author/arvid-larson/)23 March 202211 min. read Categories: [IT Ops](/category/it-ops/) Tags:[Linux](/tag/linux/) Table of Contents * [Prerequisites](#prerequisites) * [Setting Up FQDN on All Servers](#setting-up-fqdn-on-all-servers) * [Installing Icinga 2 and Monitoring Plugins](#installing-icinga-2-and-monitoring-plugins) * [Installing IDO MySQL Driver on the master Server](#installing-ido-mysql-driver-on-the-master-server) * [Configuring the Icinga 2 API](#configuring-the-icinga-2-api) * [Installing and Configuring icingaweb2 on the master Server](#installing-and-configuring-icingaweb2-on-the-master-server) * [Setting up the Icingaweb2 Installation](#setting-up-the-icingaweb2-installation) * [Initializing the Icinga 2 Master Server](#initializing-the-icinga-2-master-server) * [Initializing Icinga 2 Agent on the Client Server](#initializing-icinga-2-agent-on-the-client-server) * [Creating Zones Configuration on master Server](#creating-zones-configuration-on-master-server) * [Verifying on Icinga 2 Dashboard](#verifying-on-icinga-2-dashboard) * [Conclusion](#conclusion) Monitoring is one of the most critical aspects of infrastructure, and the Icinga monitoring tool has a variety of options to choose from. Icinga lets you flexibly monitor your entire infrastructure based on configurations. In this article, you’ll learn how to monitor your servers with the Icinga 2 monitoring stack; you’ll install the stack and set up distributed monitoring. Ready? Jump right in! ## Prerequisites This tutorial will be a hands-on demonstration. To follow along, ensure you have the following: * Two Linux machines – This tutorial uses the Ubuntu 20.04 server on master (_master_) and client (_client01_) servers. Related:[Install Ubuntu Server 20.04: A Step-by-Step Walkthrough](https://adamtheautomator.com/install-ubuntu/) * A [user](https://adamtheautomator.com/create-user-on-ubuntu/) with root privileges on both devices. * [MariaDB](https://www.digitalocean.com/community/tutorials/how-to-install-mariadb-on-ubuntu-20-04) is installed and running on the master server. ## Setting Up FQDN on All Servers Icinga 2 is an enterprise-ready monitoring solution that allows you to monitor server infrastructures and applications in many locations. You’ll set up fully qualified domain names (FQDN) for all your servers, which eases server management in large environments. The domain in this tutorial is named _example.lan,_ but you can use an existing local domain. > _Note that you need to run the following commands on both servers. Change the values accordingly._ 1\. Open your terminal and connect to the server. 2\. Next, run each command below to set up the FQDN on the master and client machines. FQDN for the servers are `master.example.lan` (_master_) and `client01.example.lan` (_client01_). ```bash # Set FQDN on master server sudo hostnamectl set-hostname master.example.lan # Set FQDN on client01 server sudo hostnamectl set-hostname client01.example.lan ``` 3\. Edit the _/etc/hosts_ file with your preferred text editor and populate the entry below. Replace the IP addresses with the actual server addresses. ```powershell # /etc/hosts for master 172.16.1.10 master.example.lan master # /etc/hosts for client01 172.16.1.30 client01.example.lan client01 ``` 4\. Finally, run the below command to verify the FQDN. ```bash hostname --fqdn ``` ![Checking FQDN on Master and Client Servers](https://adamtheautomator.com/wp-content/uploads/2022/03/image-352.png) Checking FQDN on Master and Client Servers ## Installing Icinga 2 and Monitoring Plugins With the FQDN configured, it’s time to install Icinga 2. You’ll install the apt packages for both Icinga 2 and monitoring plugins. These packages are the main component of Icinga 2 and the plugin that provides scripts for system monitoring. > _Installing Icinga 2 and Monitoring Plugins should be done in the master and client01 servers._ 1\. Run the below [`apt install`](https://linuxize.com/post/how-to-use-apt-command/#installing-packages-apt-install) command to install package dependencies securely through HTTPS (`apt-transport-https`) and verify the GPG key. ```bash sudo apt install -y apt-transport-https wget gnupg ``` 2\. Next, run the `wget` command to download Icinga 2’s GPG key. The piped `apt-key` command adds the GPG key to verify the Icinga 2 packages’ integrity. ```bash wget -O - https://packages.icinga.com/icinga.key | apt-key add - ``` ![Adding the GPG key](https://adamtheautomator.com/wp-content/uploads/2022/03/image-353.png) Adding the GPG key Related:[How to Download Files with Python Wget](https://adamtheautomator.com/python-wget/) 3\. Run each command below to add the Icinga 2 apt repository on your machine. ```bash # Adding repository for Icinga 2 . /etc/os-release; if [ ! -z ${UBUNTU_CODENAME+x} ]; then DIST="${UBUNTU_CODENAME}"; else DIST="$(lsb_release -c| awk '{print $2}')"; fi; \ echo "deb https://packages.icinga.com/ubuntu icinga-${DIST} main" > \ /etc/apt/sources.list.d/${DIST}-icinga.list echo "deb-src https://packages.icinga.com/ubuntu icinga-${DIST} main" >> \ /etc/apt/sources.list.d/${DIST}-icinga.list # Verify the Icinga 2 apt repository is added cat /etc/apt/sources.list.d/focal-icinga.list ``` ![Adding the Icinga2 Repository](https://adamtheautomator.com/wp-content/uploads/2022/03/image-354.png) Adding the Icinga 2 Repository 4\. Lastly, run the `apt` commands below to refresh the package index and install the packages. ```bash # Refresh package index sudo apt update # Installing package sudo apt install icinga2 monitoring-plugins -y ``` ![Installing Monitoring Plugin](https://adamtheautomator.com/wp-content/uploads/2022/03/image-355.png) Installing Monitoring Plugin ## Installing IDO MySQL Driver on the master Server Icinga 2 is installed and almost ready to work. But for Icinga 2 to properly work, it needs a database. So, you’ll install the IDO MySQL Driver and set up the database connection on your master server. > _The Icinga 2 repository provides the `icinga2-ido-mysql` package. The package is a database driver that works for MySQL and MariaDB servers._ 1\. Run the command below to install the `icinga2-ido-mysql` package. ```bash sudo apt install -y icinga2-ido-mysql ``` ![Installing icinga2-ido-mysql](https://adamtheautomator.com/wp-content/uploads/2022/03/image-356.png) Installing icinga2-ido-mysql 2\. Select **Yes** when prompted to set up the driver and create a database, as shown below. The configuration sets Icinga 2 as the database user and generates a new file, _/etc/icinga2/features-available/ido-mysql.conf_. ![Setting up icinga2-ido-mysql](https://adamtheautomator.com/wp-content/uploads/2022/03/image-357.png) Setting up icinga2-ido-mysql 3\. Now, select **Yes** to enable the **ido-mysql** feature on Icinga 2, which automatically creates a new database and user for Icinga 2. ![Enabling the ido-mysql Feature](https://adamtheautomator.com/wp-content/uploads/2022/03/image-358.png) Enabling the ido-mysql Feature 4\. Provide a password for MariaDB user icinga2, and select **OK** to complete the icinga2-ido-mysql installation. ![Setting up password for user Icinga2](https://adamtheautomator.com/wp-content/uploads/2022/03/image-359.png) Setting up password for user Icinga2 5\. Next, run the `cat` command below to check the contents of the _/etc/icinga2/features-available/ido-mysql.conf_ file. ```bash cat /etc/icinga2/features-available/ido-mysql.conf ``` You’ll see the details below for the MariaDB database matching what you provided. ![Checking the ido-mysql.conf file](https://adamtheautomator.com/wp-content/uploads/2022/03/image-360.png) Checking the _ido-mysql.conf_ file 6\. Run the [`icinga2`](https://icinga.com/docs/icinga-2/latest/doc/11-cli-commands/) command below to `enable` the `ido-mysql` feature. ```bash sudo icinga2 feature enable ido-mysql ``` 7\. Lastly, run the following commands to restart and verify the `icinga2` service `status`. ```bash # restart service sudo systemctl restart icinga2 # verifying service sudo systemctl status icinga2 ``` Similarly below, you’ll see the ido-mysql feature is enabled, and the **icinga2** service is active (running). ![Restarting and Verifying the icinga2 Service](https://adamtheautomator.com/wp-content/uploads/2022/03/image-361.png) Restarting and Verifying the icinga2 Service ## Configuring the Icinga 2 API You’ve just installed the Icinga 2 IDO MySQL driver and configured the database connection. But to manage and configure the Icinga 2 monitoring stack through HTTP requests, you’ll configure the Icinga 2 API. > _The Icinga 2 monitoring stack is also a distributed monitoring system._ 1\. Run the command below on your master server to enable the Icinga 2 API, generate [TLS certificates](https://www.venafi.com/blog/what-ssltls-x509-certificate) for Icinga 2, and update Icinga 2 configurations. ```bash sudo icinga2 api setup ``` ![Enabling Icinga2 API](https://adamtheautomator.com/wp-content/uploads/2022/03/image-362.png) Enabling Icinga 2 API 2\. Now, edit the _/etc/icinga2/conf.d/api-users.conf_ file in your text editor and populate the following configuration. Take note of the API user credentials you’re providing as you’ll need them later. > _Replace the password with an appropriately strong one as necessary._ ```json /** api for icingaweb2 */ object ApiUser "icingaweb2" { password = "passwordapiicngaweb2" permissions = [ "status/query", "actions/*", "objects/modify/*", "objects/query/*" ] } ``` 3\. Lastly, run the below command to `restart` the `icinga2` service and apply the new configuration. ```bash sudo systemctl restart icinga2 ``` ## Installing and Configuring icingaweb2 on the master Server You’ll need a dashboard to better monitor your hosts after enabling the Icinga 2 API and configuring the new API user. How? You’ll install and configure the [Icingaweb2](https://icinga.com/docs/icinga-web-2/latest/doc/01-About/) on the master server. The Icingaweb2 is the web front-end for the Icinga 2 monitoring stack, written in PHP, and provides a responsive and extensible monitoring dashboard. 1\. Run the command below to install `icingaweb2` with components needed to handle the Icingaweb2 web application. ```bash sudo apt install icingaweb2 libapache2-mod-php icingacli -y ``` ![Installing Icingaweb2](https://adamtheautomator.com/wp-content/uploads/2022/03/image-363.png) Installing Icingaweb2 2\. Next, run the `icingacli` command below to generate a token for setting up Icingaweb2. The Icingaweb2 installation will need this token later, so write it down. ```bash sudo icingacli setup token create ``` ![Generating Icingaweb2 Setup Token](https://adamtheautomator.com/wp-content/uploads/2022/03/image-364.png) Generating Icingaweb2 Setup Token 3\. Execute the `mysql` command below to log in to the MySQL shell and create a new user (`root`) for Icingaweb2. ```bash mysql -u root -p ``` ![Logging in to MariaDB Shell](https://adamtheautomator.com/wp-content/uploads/2022/03/image-365.png) Logging in to MariaDB Shell 4\. Now, run the following queries to create a new database and the user `icingaweb2` with a password. You can set the username and password as you prefer. ```sql CREATE DATABASE icingaweb2; GRANT ALL ON icingaweb2.* TO icingaweb2@localhost IDENTIFIED BY 'strongpasswordicingaweb2'; FLUSH PRIVILEGES; ``` ![Creating a New Database and User for Icingaweb2](https://adamtheautomator.com/wp-content/uploads/2022/03/image-366.png) Creating a New Database and User for Icingaweb2 5\. Lastly, run `exit` to log out from the MySQL shell. ```sql exit ``` ![Exiting from the MySQL Shell](https://adamtheautomator.com/wp-content/uploads/2022/03/image-367.png) Exiting from the MySQL Shell ## Setting up the Icingaweb2 Installation You’ve installed Icingaweb2 on the master server and generated the setup token for a new user. But to access the icingaweb2 dashboard, you’ll set up your icingaweb2 installation via your web browser. 1\. Open your web browser and navigate to the master server IP address, followed by the URL path _/icingaweb2/setup_ (i.e., _http://172.16.1.10/icingaweb2/setup)_. 2\. Next, input the Icingaweb2 setup token you generated in the “Installing and Configuring icingaweb2 on the Master Server” section (step two), and click **Next**. ![Inputting the Setup Token](https://adamtheautomator.com/wp-content/uploads/2022/03/image-368.png) Inputting the Setup Token 3\. Accept the defaults (**Monitoring**) in the **Modules** page and click **Next**. ![Enabling Monitoring Module](https://adamtheautomator.com/wp-content/uploads/2022/03/image-369.png) Enabling Monitoring Module 4\. Select **Database** in the **Authentication Type** dropdown box, and click **Next**. This authentication type secures the Icingaweb2 administration dashboard. At this point, the Icingaweb2 starts checking system requirements for the installation. ![Setting Authentication Type](https://adamtheautomator.com/wp-content/uploads/2022/03/image-370.png) Setting Authentication Type 5\. Ensure all status requirements are green, except the PostgreSQL one, and click **Next**. > _Ignore the PostgreSQL error message. You’re using MariaDB as the database backend._ ![Checking System Requirements](https://adamtheautomator.com/wp-content/uploads/2022/03/image-371.png) Checking System Requirements 6\. Now, provide the same values you set in the “Installing and Configuring icingaweb2 on the Master Server” section (step four) to the **Database Resource** form below. Click the Validate Configuration to ensure the configuration works, then click Next after seeing The configuration has been successfully validated message. ![Setting Database Resource for Icingaweb2](https://adamtheautomator.com/wp-content/uploads/2022/03/image-372.png) Setting Database Resource for Icingaweb2 7\. Leave the **Authentication Backend** with the default value (**icingaweb2)** as the backend name, and click **Next.** ![Creating Backend Name](https://adamtheautomator.com/wp-content/uploads/2022/03/image-373.png) Creating Backend Name 8\. Provide credentials for Icingaweb2’s first administrative account and click **Next**. Take note of the credentials, as you’ll need them to log in to the Icingaweb2 dashboard later. ![Creating admin user for Icingaweb2](https://adamtheautomator.com/wp-content/uploads/2022/03/image-374.png) Creating admin user for Icingaweb2 9\. Leave the default logging values in the **Application Configuration** for Icingaweb2, and click **Next**. ![Setting up Logs](https://adamtheautomator.com/wp-content/uploads/2022/03/image-375.png) Setting up Logs 10\. Next, review the configuration settings, and click **Next** to confirm the icingaweb2 installation. ![Confirming Icinga2 installation](https://adamtheautomator.com/wp-content/uploads/2022/03/image-376.png) Confirming Icinga 2 installation 11\. Now, click **Next** to continue setting up the monitoring module for Icingaweb2. ![Setting up the Monitoring Module](https://adamtheautomator.com/wp-content/uploads/2022/03/image-377.png) Setting up the Monitoring Module 12\. Provide the database name and user for Icinga 2 accordingly, as shown below. The database details for Icinga 2 are available in the _/etc/icinga2/features-available/ido-mysql.conf_ file. Click the Validate Configuration, ensure the database connection is successful, then click Next. ![Setting Database for Monitoring Module](https://adamtheautomator.com/wp-content/uploads/2022/03/image-378.png) Setting Database for Monitoring Module 13\. Enter the Icinga 2 API user and password stored in the _/etc/icinga2/conf.d/api-users.conf_ file to the fields below. Click the Validate Configuration button, ensure you get the message saying The configuration has been successfully validated, and click Next. ![Setting up API users Icingaweb2](https://adamtheautomator.com/wp-content/uploads/2022/03/image-379.png) Setting up API users Icingaweb2 14\. Accept the default custom variables on the **Monitoring Security** setting and click **Next**. These variables help secure your monitoring environment from prying eyes. ![Configuring Security to protect secret](https://adamtheautomator.com/wp-content/uploads/2022/03/image-380.png) Configuring Security to protect secret 15\. Inspect the monitoring module configuration, and click **Finish** to complete the installation. ![Confirming Installation Monitoring Module Values ](https://adamtheautomator.com/wp-content/uploads/2022/03/image-381.png) Confirming Installation Monitoring Module Values 16\. When the icingaweb2 installation completes, you’ll see the **Congratulation! Icinga Web 2 has been successfully set up** message, as shown below. Click the Login to Icinga Web 2, and your browser redirects to the icingaweb2 login page (step 17). ![Completed Icingaweb2 Installation](https://adamtheautomator.com/wp-content/uploads/2022/03/image-382.png) Completed Icingaweb2 Installation 17\. Input your admin user and password for icingaweb2 and click **Login** to access the Icinga dashboard. ![Logging in to Icingaweb2](https://adamtheautomator.com/wp-content/uploads/2022/03/image-383.png) Logging in to Icingaweb2 18\. Finally, click **Overview** —> **Services**, and you’ll see the status of your **master** server similar to the one below. ![Viewing Master Server Status in Icingaweb2 Dashboard](https://adamtheautomator.com/wp-content/uploads/2022/03/image-384.png) Viewing Master Server Status in Icingaweb2 Dashboard ## Initializing the Icinga 2 Master Server You’ve successfully installed the Icinga 2 monitoring stack to monitor your master server’s status. Now you’ll initialize the master server as the master node for the Icinga 2 monitoring stack. The master node is the main controller of the Icinga 2 distributed monitoring stack. 1\. Run the command below on your master server’s terminal to initialize the `icinga2` master `node`. ```bash sudo icinga2 node wizard ``` 2\. Press **n** to set up agent/satellite node (Icinga 2 master node). ![Setting up Agent/Satellite Node](https://adamtheautomator.com/wp-content/uploads/2022/03/image-385.png) Setting up Agent/Satellite Node 3\. Press ENTER on the **common name (CN)** configuration. The Icinga 2 will automatically detect the FQDN of the server. ![Setting Common Name Configuration](https://adamtheautomator.com/wp-content/uploads/2022/03/image-386.png) Setting Common Name Configuration 4\. Next, specify the master zone name as **master.example.lan**, and press **N** to skip adding global zones. The default global zones sync all configuration objects in Icinga 2. ![Specifying the Master Zone](https://adamtheautomator.com/wp-content/uploads/2022/03/image-387.png) Specifying the Master Zone 5\. Leave the API bind host and port as default and press ENTER. The API will communicate between the Icinga2 node with TLS encrypted connections. ![Specifying API Bind Host and Port](https://adamtheautomator.com/wp-content/uploads/2022/03/image-388.png) Specifying API Bind Host and Port 6\. Type **Y** to disable all configurations inside the _/etc/icinga2/conf.d/_ directory since you’ll use the Icinga2 zones configuration that you’ll create later. ![Disabling Configuration in the /etc/icinga2/conf.d Directory](https://adamtheautomator.com/wp-content/uploads/2022/03/image-389.png) Disabling Configuration in the _/etc/icinga2/conf.d_ Directory 7\. Now, run the `systemctl` command below to restart the `icinga2` service and apply the configuration. ```bash sudo systemctl restart icinga2 ``` 8\. Lastly, run the below command to generate the ticket for registering `client01` with Icinga 2. ```bash sudo icinga2 pki ticket --cn 'client01.example.lan' ``` Copy the generated ticket that you’ll use to enroll client01 as an Icinga 2 agent later. ![Generating Ticket Icinga2](https://adamtheautomator.com/wp-content/uploads/2022/03/image-390.png) Generating Ticket Icinga 2 ## Initializing Icinga 2 Agent on the Client Server After you’ve initialized the master server as the master node, you’ll also set up the Icinga 2 agent on client01 to monitor the client01 machine using Icinga 2. 1\. Log in to client01, and follow the steps you did in the “Initializing the Icinga 2 Master Server” section (steps one to three) to initialize the Icinga 2 agent. 2\. Next, specify the parent endpoint as **master.example.lan**, and enter **Y** to establish the connection with the parent/master node. ![Setting Parent Endpoint](https://adamtheautomator.com/wp-content/uploads/2022/03/image-391.png) Setting Parent Endpoint 3\. Input the IP address of the master server (**172.16.1.10**), and leave the endpoint port as default. ![Setting Master Server IP Address](https://adamtheautomator.com/wp-content/uploads/2022/03/image-392.png) Setting Master Server IP Address 4\. Now, type **N** when asked to add more endpoints. ![Declining Adding More Endpoints](https://adamtheautomator.com/wp-content/uploads/2022/03/image-393.png) Declining Adding More Endpoints 5\. Type **Y** to confirm the information and add the certificate for the Icinga 2 master server. ![Adding TLS Certificates](https://adamtheautomator.com/wp-content/uploads/2022/03/image-394.png) Adding TLS Certificates 6\. Input the ticket you generated in the last step of the “Initializing the Icinga 2 Master Server” section to register the agent node (**client01.example.lan).** ![Registering the Agent Node](https://adamtheautomator.com/wp-content/uploads/2022/03/image-395.png) Registering the Agent Node 7\. Press ENTER to accept the default values for the API bind host and port. ![Accepting Default Values for API Bind Host and Port](https://adamtheautomator.com/wp-content/uploads/2022/03/image-396.png) Accepting Default Values for API Bind Host and Port 8\. Next, enter **Y** twice to accept config and commands from the parent/master node. ![Accepting Config and Commands from the Parent Node](https://adamtheautomator.com/wp-content/uploads/2022/03/image-397.png) Accepting Config and Commands from the Parent Node 9\. Press ENTER to accept the default for the local zone name, but enter the parent zone name, which should match the zone name (**master.example.lan**) on the master server. ![Setting Local and Parent Zone Names](https://adamtheautomator.com/wp-content/uploads/2022/03/image-398.png) Setting Local and Parent Zone Names 10\. Now, type **N** to skip adding global zones, and type **Y** to disable configurations on the _/etc/icinga2/conf.d_ directory. ![Skipping Adding Global Zones](https://adamtheautomator.com/wp-content/uploads/2022/03/image-399.png) Skipping Adding Global Zones 11\. Lastly, run the following command to restart the Icinga 2 service and apply the configuration changes. `sudo systemctl restart icinga2` ```bash sudo systemctl restart icinga2 ``` ## Creating Zones Configuration on master Server With the distributed monitoring out of the way, you’ll create a new zone directory and define the monitoring configuration for the client agent. 1\. Run the `mkdir` command below to create a new directory as default zone (`master.example.lan`) on Icinga 2. ```bash sudo mkdir -p /etc/icinga2/zones.d/master.example.lan/ ``` 2\. Next, create a configuration file (_client01.example.lan.conf_) in the _/etc/icinga2/zones.d/master.example.lan/_ directory. Populate the file with the following configuration. The code below defines the endpoints, zones, and the host object to monitor the servers. ```json // Endpoints object Endpoint "client01.example.lan" { } // Zones object Zone "client01.example.lan" { endpoints = [ "client01.example.lan" ] parent = "master.example.lan" } // Host Objects object Host "client01.example.lan" { check_command = "hostalive" address = "172.16.1.30" vars.client_endpoint = name } ``` 3\. Create another configuration file, copy/paste the code below to the file, and save it as _/etc/icinga2/zones.d/master.example.lan/services.conf._ This configuration below monitors some basic services on the client01 machine. ```json // Ping apply Service "Ping" { check_command = "ping4" assign where host.address // check executed on master } // System Load apply Service "System Load" { check_command = "load" command_endpoint = host.vars.client_endpoint // Check executed on client01 assign where host.vars.client_endpoint } // SSH Service apply Service "SSH Service" { check_command = "ssh" command_endpoint = host.vars.client_endpoint assign where host.vars.client_endpoint } // Icinga 2 Service apply Service "Icinga2 Service" { check_command = "icinga" command_endpoint = host.vars.client_endpoint assign where host.vars.client_endpoint } ``` 4\. Now run the `icinga2` command below to verify the Icinga 2 configuration. ```bash sudo icinga2 daemon -C ``` If all goes well, you’ll see an output similar to the one below. ![Verifying Icinga2 Configuration](https://adamtheautomator.com/wp-content/uploads/2022/03/image-400.png) Verifying Icinga 2 Configuration 5\. Lastly, run the below command to restart the `icinga2` service and apply the configuration changes. ```bash sudo systemctl restart icinga2 ``` ## Verifying on Icinga 2 Dashboard You’ve configured all resources, but you still need to test if they all work. You’ll verify the results of your work by checking the Icinga 2 dashboard. Go back to the Icinga 2 dashboard and click on the **Overview** —> **Hosts**, as shown below, and you’ll see that the **client01** is **UP**. ![Checking Hosts on Icinga2 Dashboard](https://adamtheautomator.com/wp-content/uploads/2022/03/image-401.png) Checking Hosts on Icinga 2 Dashboard Now, click the **Services** menu to see all monitored services with the Icinga 2 monitoring stack on client01. ![Checking Services on Icinga2 Dashboard](https://adamtheautomator.com/wp-content/uploads/2022/03/image-402.png) Checking Services on Icinga 2 Dashboard ## Conclusion This tutorial aims to help you through the process of setting up the Icinga 2 monitoring stack on the Ubuntu server. You’ve also learned how to set up [Distributed Monitoring](https://icinga.com/docs/icinga-2/latest/doc/06-distributed-monitoring/) using an Icinga 2 agent to monitor an extensive infrastructure. Now, what’s next? Perhaps learn to set up the [Icinga Director](https://icinga.com/docs/icinga-director/latest/doc/02-Installation/) to simplify your monitoring? Share this article [Share on X](https://twitter.com/intent/tweet?url=https%3A%2F%2Fadamtheautomator.com%2Ficinga%2F&text=How%20to%20Monitor%20Hosts%20With%20the%20Linux%20Icinga%20Monitoring%20Tool)[Share on Facebook](https://www.facebook.com/sharer/sharer.php?u=https%3A%2F%2Fadamtheautomator.com%2Ficinga%2F)[Share on LinkedIn](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Fadamtheautomator.com%2Ficinga%2F) ## Related Posts ![](https://adamtheautomator.com/wp-content/uploads/2022/09/Practical-Linux-Unix-Tee-Commands-for-the-Linux-Admin.jpg) ### [Master Unix tee Commands for Real-World Linux Admin Tasks](/unix-tee/) Simplify Linux output management and streamline your workflow with the “Unix tee” command. 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