{"id":1013,"date":"2019-12-11T15:01:44","date_gmt":"2019-12-11T21:01:44","guid":{"rendered":"https:\/\/linuxhostsupport.com\/blog\/?p=1013"},"modified":"2019-12-11T15:01:44","modified_gmt":"2019-12-11T21:01:44","slug":"how-to-install-nagios-core-on-ubuntu-16-04","status":"publish","type":"post","link":"https:\/\/linuxhostsupport.com\/blog\/how-to-install-nagios-core-on-ubuntu-16-04\/","title":{"rendered":"How to Install Nagios Core on Ubuntu 16.04"},"content":{"rendered":"
\"\"<\/a><\/div>

\"\"This tutorial explains how to install Nagios Core on an Ubuntu 16.04 server. Nagios is an open source enterprise-class software that is used to monitor network infrastructures, servers and applications. With Nagios you can monitor Linux and Windows servers as well as web applications, Linux and Unix applications and Windows applications. The features include parallelized service checks, plugin system, notifications via email, pager or user defined service, web interface for viewing status, log files, problem history and notifications and much more.<\/p>\n

This guide should work on other Linux VPS systems as well, such as the latest versions of Ubuntu, but it was tested and written for\u00a0Ubuntu 16.04.<\/p>\n

<\/p>\n

Step 1. Update your Ubuntu 16.04 server and Install the Necessary Packages<\/h2>\n

Log in to your VPS via SSH as a sudo user:<\/p>\n

ssh userame@IP_Address<\/span><\/pre>\n
Once you are logged in, issue the following commands to update the packages list and upgrade all installed packages:<\/p>\n
sudo apt update\r\nsudo apt upgrade<\/pre>\n
Next, install the install the prerequisite packages necessary for building Nagios and Nagios plugins with the following command:<\/p>\n
sudo apt install autoconf gcc libc6 make wget unzip libgd2-xpm-dev<\/pre>\n
Step 2. Install Apache and PHP 7<\/h2>\n
To install Apache, PHP 7, and all the necessary modules on your Ubuntu 16.04 server, run the following command:<\/p>\n
sudo apt install apache2 php libapache2-mod-php7.0<\/pre>\n
When the Apache installation is complete, run the following command to enable Apache to start on boot with:<\/p>\n
sudo systemctl enable apache2.service<\/pre>\n
Step 3. Download and Install Nagios<\/h2>\n
Download the latest stable version of the Nagios tar archive in the \/tmp<\/code> directory on your server by running the following wget command:<\/p>\n
wget https:\/\/github.com\/NagiosEnterprises\/nagioscore\/releases\/download\/nagios-4.4.2\/nagios-4.4.2.tar.gz -O \/tmp\/nagioscore.tar.gz<\/pre>\n
When the download is completed navigate to the \/tmp<\/code> directory extract the archive by issuing following command:<\/p>\n
cd \/tmp\r\nsudo tar xf nagioscore.tar.gz<\/pre>\n
Once the Nagios Plugins archive is extracted, change to the nagios-4.4.2<\/code> directory:<\/p>\n
cd \/tmp\/nagios-4.4.2<\/pre>\n
Next step is to run the .\/configure<\/code> script which will check your system for missing libraries and binaries and prepare the Nagios source code for the build process:<\/p>\n
sudo .\/configure --with-httpd-conf=\/etc\/apache2\/sites-enabled<\/pre>\n
The output will look like the following:<\/p>\n
*** Configuration summary for nagios 4.4.2 2018-08-16 ***:\r\n\r\n General Options:\r\n -------------------------\r\n        Nagios executable:  nagios\r\n        Nagios user\/group:  nagios,nagios\r\n       Command user\/group:  nagios,nagios\r\n             Event Broker:  yes\r\n        Install ${prefix}:  \/usr\/local\/nagios\r\n    Install ${includedir}:  \/usr\/local\/nagios\/include\/nagios\r\n                Lock file:  \/run\/nagios.lock\r\n   Check result directory:  \/usr\/local\/nagios\/var\/spool\/checkresults\r\n           Init directory:  \/lib\/systemd\/system\r\n  Apache conf.d directory:  \/etc\/apache2\/sites-enabled\r\n             Mail program:  \/usr\/bin\/mail\r\n                  Host OS:  linux-gnu\r\n          IOBroker Method:  epoll\r\n\r\n Web Interface Options:\r\n ------------------------\r\n                 HTML URL:  http:\/\/localhost\/nagios\/\r\n                  CGI URL:  http:\/\/localhost\/nagios\/cgi-bin\/\r\n Traceroute (used by WAP):  \/usr\/sbin\/traceroute\r\n\r\n\r\nReview the options above for accuracy.  If they look okay,\r\ntype 'make all' to compile the main program and CGIs.\r\n<\/pre>\n
Now that the configuration is completed start the compilation process using the make all <\/code>command:<\/p>\n
make all<\/pre>\n
Once completed the command will print the following output:<\/p>\n
*** Support Notes *******************************************\r\n\r\nIf you have questions about configuring or running Nagios,\r\nplease make sure that you:\r\n\r\n     - Look at the sample config files\r\n     - Read the documentation on the Nagios Library at:\r\n          library.nagios.com\r\n\r\nbefore you post a question to one of the mailing lists.\r\nAlso make sure to include pertinent information that could\r\nhelp others help you.  This might include:\r\n\r\n     - What version of Nagios you are using\r\n     - What version of the plugins you are using\r\n     - Relevant snippets from your config files\r\n     - Relevant error messages from the Nagios log file\r\n\r\nFor more information on obtaining support for Nagios, visit:\r\n\r\n       support.nagios.com\r\n\r\n*************************************************************\r\n\r\nEnjoy.\r\n<\/pre>\n
Run the following command to create the Nagios user and group and add Apache to the Nagios group:<\/p>\n
sudo make install-groups-users\r\nsudo usermod -a -G nagios www-data\r\n<\/pre>\n
The next step is to install Nagios using the make install<\/code> command:<\/p>\n
sudo make install<\/pre>\n
Run the following command to install the Nagios sample configuration files:<\/p>\n
sudo make install-config<\/pre>\n
Install the initialization script so that you can manage your Nagios service using the systemctl<\/code> command :<\/p>\n
sudo make install-daemoninit<\/pre>\n
Next, install the Apache web server configuration files with:<\/p>\n
sudo make install-webconf<\/pre>\n
Restart apache service:<\/p>\n
sudo systemctl restart apache2<\/pre>\n
Run the following command to create a user account called nagiosadmin<\/code><\/p>\n
sudo htpasswd -c \/usr\/local\/nagios\/etc\/htpasswd.users nagiosadmin<\/pre>\n
Next run the following command to install and configure the external command directory:<\/p>\n
sudo make install-commandmode<\/pre>\n
Step 4. Install Nagios Plugins<\/h2>\n
Install the following dependencies necessary for downloading and compiling Nagios plugins:<\/p>\n
sudo apt install autoconf gcc libc6 libmcrypt-dev make libssl-dev wget bc gawk dc build-essential snmp libnet-snmp-perl gettext\r\n<\/pre>\n
Download the latest stable version of the Nagios tar archive in the \/tmp<\/code> directory on your server with:<\/p>\n
wget --no-check-certificate -O \/tmp\/nagios-plugins.tar.gz https:\/\/github.com\/nagios-plugins\/nagios-plugins\/archive\/release-2.2.1.tar.gz\r\n<\/pre>\n
When the download is completed change to the tmp directory extract the archive with the following commands:<\/p>\n
cd \/tmp\r\nsudo tar xf nagios-plugins.tar.gz<\/pre>\n
Once the Nagios Plugins archive is extracted, change to the nagios-plugins-release-2.2.1<\/code> directory:<\/p>\n
cd \/tmp\/nagios-plugins-release-2.2.1<\/pre>\n
The following commands will check your system for missing libraries and binaries and prepare the Nagios Plugins source code for the build process:<\/p>\n
.\/tools\/setup\r\n.\/configure\r\n<\/pre>\n
When the configuration is complete start the compilation process using the make<\/code> command:<\/p>\n
make<\/pre>\n
Install the Nagios Plugins using the make install<\/code> command:<\/p>\n
sudo make install<\/pre>\n
Step 5. Access Nagios<\/h2>\n
Now that you have both Nagios and Nagios Plugins installed on your Ubuntu system, start the Nagios service with the following command:<\/p>\n
systemctl start nagios<\/pre>\n
Check the service status with:<\/p>\n
systemctl status nagios<\/pre>\n
The output will look something like bellow:<\/p>\n
\u25cf nagios.service - Nagios Core 4.4.2\r\n   Loaded: loaded (\/lib\/systemd\/system\/nagios.service; enabled; vendor preset: enabled)\r\n   Active: active (running) since Sat 2018-12-08 09:56:26 CST; 5s ago\r\n     Docs: https:\/\/www.nagios.org\/documentation\r\n  Process: 16101 ExecStart=\/usr\/local\/nagios\/bin\/nagios -d \/usr\/local\/nagios\/etc\/nagios.cfg (code=exited, status=0\/SUCCESS)\r\n  Process: 16098 ExecStartPre=\/usr\/local\/nagios\/bin\/nagios -v \/usr\/local\/nagios\/etc\/nagios.cfg (code=exited, status=0\/SUCCESS)\r\n Main PID: 16102 (nagios)\r\n<\/pre>\n
Open your browser and navigate to http:\/\/your-domain-or-ip\/nagios<\/code> and you will be presented with the login pop-up.<\/p>\n
Enter the login credentials that you created earlier with the htpasswd<\/code> command and you will be redirected to the Nagios home page as shown on the image below:<\/p>\n
 <\/p>\n
\"\"<\/p>\n
That\u2019s it. You have successfully installed Nagios on Ubuntu 16.04. For more information about how to manage your Nagios installation, please refer to the official Nagios documentation<\/a>.<\/p>\n
\n
\"\"Of course, you don\u2019t have to install Nagios on Ubuntu 16.04 if you use one of our\u00a0Fully-Managed Server Support<\/a> services, in which case you can simply ask our expert system administrators to install Nagios for you. They are available 24\u00d77 and will take care of your request immediately.<\/p>\n
PS.<\/strong>\u00a0<\/span>If you liked this post on how to install Nagios on Ubuntu 16.04, or if you found it helpful, please share it with your friends on the social networks using the sharing buttons, or simply leave a comment in the comments section. Thanks.<\/p>
\"\"<\/a><\/div>\n","protected":false},"excerpt":{"rendered":"
This tutorial explains how to install Nagios Core on an Ubuntu 16.04 server. Nagios is an open source enterprise-class software that is used to monitor network infrastructures, servers and applications. With Nagios you can monitor Linux and Windows servers as well as web applications, Linux and Unix applications and Windows applications. The features include parallelized […]<\/p>\n","protected":false},"author":1,"featured_media":1015,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-1013","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tutorials"],"yoast_head":"\nHow to Install Nagios Core on Ubuntu 16.04 | LinuxHostSupport<\/title>\n<meta name=\"description\" content=\"This tutorial explains how to install Nagios Core on an Ubuntu 16.04 server. 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