{"id":909,"date":"2018-10-12T03:16:05","date_gmt":"2018-10-12T08:16:05","guid":{"rendered":"https:\/\/www.linuxcloudvps.com\/blog\/?p=909"},"modified":"2018-10-12T03:16:05","modified_gmt":"2018-10-12T08:16:05","slug":"how-to-install-nagios-on-debian-9","status":"publish","type":"post","link":"https:\/\/www.linuxcloudvps.com\/blog\/how-to-install-nagios-on-debian-9\/","title":{"rendered":"How to Install and Configure Nagios on Debian 9"},"content":{"rendered":"<p>In this tutorial, we will show you <strong>how to install Nagios on Debian 9<\/strong>. Nagios is an open-source\u00a0monitoring tool for servers, network devices, and applications. It helps you monitor the services, resources, and applications that run on your server.\u00a0It can also be used to monitor Linux and Windows servers as well as web applications, Linux\/Unix applications, and Windows applications. Some of the features include parallelized service checks, a plugin system, notifications via email, pager or user-defined service, a web interface for viewing status, log files, problem history with a notification system, and much more.<!--more--><\/p>\n<h3>1. Update your server and install the necessary packages<\/h3>\n<p>Log in to your VPS via SSH as a sudo user:<\/p>\n<pre>ssh userame@IP_Address<\/pre>\n<p>Once you are logged in, update your system repositories and software packages by issuing the following command:<\/p>\n<pre>apt update<\/pre>\n<pre>apt upgrade<\/pre>\n<p>The next step is to install the pre-requisite packages necessary for building Nagios by executing the following command:<\/p>\n<pre>apt install -y build-essential autoconf gcc libc6 make wget unzip libgd2-xpm-dev<\/pre>\n<h3>2. Download and Install Nagios<\/h3>\n<p>Download the latest stable version of the Nagios tar archive in the <code>\/opt<\/code> directory on your server:<\/p>\n<pre>wget https:\/\/github.com\/NagiosEnterprises\/nagioscore\/archive\/nagios-4.4.2.tar.gz -O \/opt\/nagioscore.tar.gz<\/pre>\n<p>When the download is completed, change to the temporary directory and extract the archive with the following commands:<\/p>\n<pre>cd \/opt\r\nsudo tar xf nagioscore.tar.gz<\/pre>\n<p>Once the Nagios archive is extracted, change to the <code>nagioscore-nagios-4.4.2<\/code> directory:<\/p>\n<pre>cd \/opt\/nagioscore-nagios-4.4.2<\/pre>\n<p>The next step is to run the <code>.\/configure<\/code> script, which will check your system for any missing libraries or binaries and prepare the Nagios source code for the build process:<\/p>\n<pre>.\/configure<\/pre>\n<p>Now that the configuration is completed, start the compilation process by using the <code>make all<\/code> command:<\/p>\n<pre>make all<\/pre>\n<p>Run the following command to create the Nagios user and group and add &#8220;www-data&#8221; to the Nagios group:<\/p>\n<pre>sudo make install-groups-users\r\nsudo usermod -a -G nagios www-data\r\n<\/pre>\n<p>The next step is to install Nagios using the <code> make install<\/code> command:<\/p>\n<pre>sudo make install<\/pre>\n<p>Run the following command to install the Nagios sample configuration files:<\/p>\n<pre>sudo make install-config<\/pre>\n<p>We will\u00a0install\u00a0the service or daemon files and also configure them to start on boot:<\/p>\n<pre>make install-init\r\n<\/pre>\n<p>Now install and configure the external command file:<\/p>\n<pre>make install-commandmode\r\n<\/pre>\n<p>Next, install the Apache web server configuration files with:<\/p>\n<pre>sudo make install-webconf<\/pre>\n<p>Restart apache service:<\/p>\n<pre>sudo systemctl restart apache2<\/pre>\n<pre>a2enmod rewrite &amp;&amp; a2enmod cgi<\/pre>\n<h2>3. Configure the Nagios web interface<\/h2>\n<p>In order to be able to log in to Nagios, you will have to create an Apache user account. To create a new user account called nagiosadmin and assign a password to it, run the following command:<\/p>\n<pre>htpasswd -c \/usr\/local\/nagios\/etc\/htpasswd.users nagiosadmin<\/pre>\n<h2>4. Download and install Nagios plugins version 2.2.1<\/h2>\n<p>To work properly, Nagios Core needs plugins to monitor various services. You need to make sure that you have the pre-requisites packages installed:<\/p>\n<pre>apt install -y autoconf gcc libc6 libmcrypt-dev make libssl-dev wget bc gawk dc build-essential snmp libnet-snmp-perl gettext<\/pre>\n<p>Now we will create our working directory in the <code>\/opt<\/code> directory, where we will download the plugins:<\/p>\n<pre>mkdir\u00a0\/opt\/nagios\u00a0&amp;&amp; cd \/opt\/nagios<\/pre>\n<pre>wget --no-check-certificate -O nagios-plugins.tar.gz https:\/\/github.com\/nagios-plugins\/nagios-plugins\/archive\/release-2.2.1.tar.gz<\/pre>\n<pre>tar zxf nagios-plugins.tar.gz<\/pre>\n<pre>cd nagios-plugins-release-2.2.1<\/pre>\n<p>Now we will compile and install the plugins:<\/p>\n<pre>.\/tools\/setup<\/pre>\n<pre>.\/configure<\/pre>\n<pre>make<\/pre>\n<pre>make install<\/pre>\n<p>Before starting Nagios, we need to check if the Nagios configuration file has any errors:<\/p>\n<pre>\/usr\/local\/nagios\/bin\/nagios -v \/usr\/local\/nagios\/etc\/nagios.cfg\r\nNagios Core 4.4.2\r\nCopyright (c) 2009-present Nagios Core Development Team and Community Contributors\r\n...............................................\r\n...............................................\r\nChecking global event handlers...\r\nChecking obsessive compulsive processor commands...\r\nChecking misc settings...\r\n\r\nTotal Warnings: 0\r\nTotal Errors: 0\r\n\r\nThings look okay - No serious problems were detected during the pre-flight check<\/pre>\n<p>In order to access the Nagios web panel,\u00a0start the Nagios service by issuing the following commands.<\/p>\n<pre>systemctl start nagios<\/pre>\n<p>Open your browser and navigate to\u00a0<code>http:\/\/your-domain-or-ip\/nagios<\/code>\u00a0and you will be presented with the login pop-up.<\/p>\n<p>Enter the login credentials that you created earlier with the\u00a0<code>htpasswd<\/code>\u00a0command, and you will be redirected to the Nagios home page as shown in the image below:<\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-912\" src=\"https:\/\/www.linuxcloudvps.com\/blog\/wp-content\/uploads\/2018\/10\/install-nagios-on-debian-9.jpg\" alt=\"install nagios on debian 9\" width=\"700\" height=\"485\" srcset=\"https:\/\/www.linuxcloudvps.com\/blog\/wp-content\/uploads\/2018\/10\/install-nagios-on-debian-9.jpg 700w, https:\/\/www.linuxcloudvps.com\/blog\/wp-content\/uploads\/2018\/10\/install-nagios-on-debian-9-433x300.jpg 433w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/p>\n<p>That\u2019s it, you have successfully installed Nagios on Debian 9. For more information about how to manage your Nagios installation, please refer to the <a href=\"https:\/\/www.nagios.org\">official Nagios documentation.<\/a><\/p>\n<hr \/>\n<p><img decoding=\"async\" class=\"alignright size-full wp-image-913\" src=\"https:\/\/www.linuxcloudvps.com\/blog\/wp-content\/uploads\/2018\/10\/installing-nagios-on-debian-9.jpg\" alt=\"installing nagios on debian 9\" width=\"200\" height=\"48\" \/>Of course, you don\u2019t have to install Nagios on Debian 9 if you use one of our\u00a0<a href=\"https:\/\/www.linuxcloudvps.com\">Managed Hosting<\/a> services, in which case you can simply ask our expert system administrators to install Nagios on Debian 9 for you, using the LAMP stack or any other web hosting stack of your choice. They are available 24\u00d77 and will take care of your request immediately.<\/p>\n<p><strong><span style=\"color: #ff0000;\">PS<\/span>.<\/strong>\u00a0If you liked this post on how to install Nagios on Debian 9, please share it with your friends on the social networks using the buttons below or simply leave a comment in the comments section. Thanks.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this tutorial, we will show you how to install Nagios on Debian 9. Nagios is an open-source\u00a0monitoring tool for servers, network devices, and applications. It helps you monitor the services, resources, and applications that run on your server.\u00a0It can also be used to monitor Linux and Windows servers as well as web applications, Linux\/Unix &#8230; <a title=\"How to Install and Configure Nagios on Debian 9\" class=\"read-more\" href=\"https:\/\/www.linuxcloudvps.com\/blog\/how-to-install-nagios-on-debian-9\/\" aria-label=\"More on How to Install and Configure Nagios on Debian 9\">Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":911,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13],"tags":[110,146,166,165],"class_list":["post-909","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tutorials","tag-debian","tag-debian-9","tag-monitoring","tag-nagios"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Install and Configure Nagios on Debian 9 | LinuxCloudVPS Blog<\/title>\n<meta name=\"description\" content=\"In this tutorial, we will show you how to install Nagios on Debian 9. 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