{"id":151,"date":"2009-12-07T14:15:51","date_gmt":"2009-12-07T08:30:51","guid":{"rendered":"http:\/\/www.sparksupport.com\/blog\/?p=151"},"modified":"2024-06-26T12:29:07","modified_gmt":"2024-06-26T12:29:07","slug":"how-to-install-nagios","status":"publish","type":"post","link":"https:\/\/sparksupport.com\/blog\/how-to-install-nagios\/","title":{"rendered":"How to install nagios"},"content":{"rendered":"<p>Below we give a brief description of how to install and configure Nagios.<\/p>\n<p>To install Nagios make sure the following are installed and working properly in your machine<\/p>\n<pre><code>\r\n* httpd\r\n* php\r\n* gcc\r\n* glibc\r\n* glibc-common\r\n* gd\r\n* gd-devel\r\n* png\r\n* png-devel\r\n* jpeg\r\n* jpeg-devel\r\n* zlib\r\n* zlib-devel\r\n<\/code><\/pre>\n<p>Install Steps<\/p>\n<p>1) Create a new user and group as root<\/p>\n<p>Create a new user nagios.<\/p>\n<pre><code>useradd -m nagios\r\n\r\npasswd nagios <\/code><\/pre>\n<p>Create a new nagcmd group for allowing external commands to be submitted through the web interface. Add both the nagios user and the apache user to the group.<\/p>\n<pre><code>\/usr\/sbin\/groupadd nagcmd\r\n\r\n\/usr\/sbin\/usermod -a -G nagcmd nagios\r\n\r\n\/usr\/sbin\/usermod -a -G nagcmd apache <\/code><\/pre>\n<p>2) Download Nagios and the Nagios Plugins<\/p>\n<p>Download the source code tarballs of both Nagios and the Nagios plugins.<\/p>\n<pre><code>\r\nwget http:\/\/sourceforge.net\/projects\/nagios\/files\/nagios-3.x\/nagios-3.2.0\/nagios-3.2.0.tar.gz\/download\r\nwget http:\/\/sourceforge.net\/projects\/nagiosplug\/files\/nagiosplug\/1.4.14\/nagios-plugins-1.4.14.tar.gz\/download\r\n<\/code><\/pre>\n<p>3) Compile and Install Nagios<\/p>\n<p>Extract the Nagios source code.<\/p>\n<pre><code>\r\ntar xzf nagios-3.2.0.tar.gz\r\ncd nagios-3.2.0\r\n<\/code><\/pre>\n<p>make sure that these libraries are already installed in the system .Otherwise install them using YUM<\/p>\n<pre><code>\r\n   * gd\r\n    * gd-devel\r\n    * png\r\n    * png-devel\r\n    * jpeg\r\n    * jpeg-devel\r\n    * zlib\r\n    * zlib-devel <\/code><\/pre>\n<p>Run the Nagios configure script, passing the name of the group:<\/p>\n<pre><code> .\/configure --with-command-group=nagcmd <\/code><\/pre>\n<p>Compile the Nagios source code.<\/p>\n<pre><code> make all <\/code><\/pre>\n<p>Install binaries, init script, sample config files and set permissions on the external command directory.<\/p>\n<pre><code>make install\r\n\r\nmake install-init\r\n\r\nmake install-config\r\n\r\nmake install-commandmode <\/code><\/pre>\n<p>4) Customize Configuration<\/p>\n<p>After installation the default configuration file can be found in the directory \/usr\/local\/nagios\/etc\/. Also edit your contact information<\/p>\n<pre><code> vi \/usr\/local\/nagios\/etc\/objects\/contacts.cfg<\/code><\/pre>\n<p>5) Configure the Web Interface<\/p>\n<p>Install the Nagios web config file in the Apache conf.d directory.<\/p>\n<pre><code> make install-webconf <\/code><\/pre>\n<p>Create a nagiosadmin account for logging into the Nagios web interface.<\/p>\n<pre><code> htpasswd -c \/usr\/local\/nagios\/etc\/htpasswd.users nagiosadmin <\/code><\/pre>\n<p>Restart Apache to make the new settings take effect.<\/p>\n<pre><code> \/etc\/init.d\/httpd restart <\/code><\/pre>\n<p>6) Compile and Install the Nagios Plugins<\/p>\n<p>Extract the Nagios plugins source code.<\/p>\n<pre><code> tar xzf nagios-plugins-1.4.14.tar.gz\r\n\r\ncd nagios-plugins-1.4.14 <\/code><\/pre>\n<p>Compile and install the plugins.<\/p>\n<pre><code> .\/configure --with-nagios-user=nagios --with-nagios-group=nagios\r\nmake\r\n\r\nmake install<\/code><\/pre>\n<p>7) Start Nagios<\/p>\n<p>Add Nagios to the list of system services and have it automatically start when the system boots.<\/p>\n<pre><code> chkconfig --add nagios\r\n\r\nchkconfig nagios on <\/code><\/pre>\n<p>Verify the default Nagios configuration files.<\/p>\n<pre><code> \/usr\/local\/nagios\/bin\/nagios -v \/usr\/local\/nagios\/etc\/nagios.cfg <\/code><\/pre>\n<p>If there are no errors, start Nagios.<\/p>\n<pre><code> service nagios start\r\n<\/code><\/pre>\n<p>8) Modify SELinux Settings<\/p>\n<p>This step is important if the Selinux is not in the Permissive mode it shows error like this<\/p>\n<p>See if SELinux is in Enforcing mode.<\/p>\n<pre><code>getenforce<\/code><\/pre>\n<p>Put SELinux into Permissive mode.<\/p>\n<pre><code>setenforce 0<\/code><\/pre>\n<p>To make this change permanent, you&#8217;ll have to modify the settings in \/etc\/selinux\/config and reboot.<\/p>\n<p>9) Login to the Web Interface<br \/>\nYou should now be able to access the Nagios web interface at the URL below. You&#8217;ll be prompted for the username (nagiosadmin) and password(nagios) you specified earlier.<\/p>\n<pre><code>http:\/\/localhost\/nagios\/ <\/code><\/pre>\n<p>10) Add hosts to be monitored<\/p>\n<p>There are object configuration files in which you can define hosts, host groups, contacts, contact groups, services, etc. You can split your object definitions across several config files if you wish, or keep them all in a single config file.<\/p>\n<p>For convinience we created two files hosts.cfg and services.cfg under the directory \/usr\/local\/nagios\/etc\/objects\/ and add the file path to \/usr\/local\/nagios\/etc\/nagios.cfg as<\/p>\n<pre><code>cfg_file=\/usr\/local\/nagios\/etc\/objects\/hosts.cfg\r\ncfg_file=\/usr\/local\/nagios\/etc\/objects\/services.cfg <\/code><\/pre>\n<p>Then create a simple script to add hosts, named add_host_service.sh by adding the following lines.<\/p>\n<pre><code>## script begins here\r\n#!\/bin\/bash\r\necho \"Enter Host Name\"\r\nread name\r\necho \"Enter IP Address of $name\"\r\nread ip_add\r\n\r\necho \"\r\ndefine host{\r\n        use                     linux-server\r\n        host_name               $name\r\n        alias                   $name\r\n        address                 $ip_add\r\n        }\r\n\" &gt;&gt; \/usr\/local\/nagios\/etc\/objects\/hosts.cfg\r\n\r\necho \"\r\ndefine service {\r\nhost_name                       $name\r\nservice_description             HTTP\r\ncheck_command                   check_http\r\nuse                             generic-service\r\nnotification_interval           1\r\n}\r\ndefine service {\r\nhost_name                       $name\r\nservice_description             POP\r\ncheck_command                   check_pop\r\nuse                             generic-service\r\nnotification_interval           1\r\n}\r\ndefine service {\r\nhost_name                       $name\r\nservice_description             SMTP\r\ncheck_command                   check_smtp!-t 20\r\nuse                             generic-service\r\nnotification_interval           1\r\n}\r\n\" &gt;&gt; \/usr\/local\/nagios\/etc\/objects\/services.cfg <\/code><\/pre>\n<p>##script ends here<\/p>\n<p>The above script will monitor three services HTTP, SMTP and POP. To monitor a new service add a new define service entry as shown above.<\/p>\n<p>execute the above script by the command<\/p>\n<pre><code>sh add_host_service.sh<\/code><\/pre>\n<p>While the execution it will ask for the host name and the IP Address of the host to be added. After execution it will add a new host to nagios. To verify the nagios configuration for errors use the command<\/p>\n<pre><code>\/usr\/local\/nagios\/bin\/nagios -v \/usr\/local\/nagios\/etc\/nagios.cfg<\/code><\/pre>\n<p>For the changes to take effect we must restart the nagios as follows.<\/p>\n<pre><code>killall nagios\r\n\/usr\/local\/nagios\/bin\/nagios -d \/usr\/local\/nagios\/etc\/nagios.cfg<\/code><\/pre>\n<p>Now you can find the newly added hosts under the link Hosts in Nagios interface.<\/p>\n<p>Happy Monitoring<\/p>\n<div><strong>Posted by<\/strong><br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-140\" title=\"mmm1\" src=\"http:\/\/www.sparksupport.com\/blog\/wp-content\/uploads\/2009\/12\/mmm1.jpg\" alt=\"mmm1\" width=\"100\" height=\"100\" \/><br \/>\n<strong>Mobin<\/strong><br \/>\nJr Software Engineer<br \/>\nSparkSupport<\/div>\n<p><strong>&amp;<\/strong><\/p>\n<div><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-141\" title=\"paes\" src=\"http:\/\/www.sparksupport.com\/blog\/wp-content\/uploads\/2009\/12\/paes.jpg\" alt=\"paes\" width=\"100\" height=\"100\" \/><strong>Paes<\/strong><br \/>\nJr Software Engineer<br \/>\nSparkSupport<\/div>\n<div style=\"clear: both;\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Below we give a brief description of how to install and configure Nagios. To install Nagios make sure the following are installed and working properly<\/p>\n","protected":false},"author":2,"featured_media":5109,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[10,6],"tags":[61],"class_list":["post-151","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general","category-linux","tag-how-to-install-nagios"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to install nagios - right instructions on installation process<\/title>\n<meta name=\"description\" content=\"Are you looking for the right instructions on how to install nagios? 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