{"id":14109,"date":"2020-05-19T08:38:19","date_gmt":"2020-05-19T06:38:19","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/install-configure-a-nagios-server\/"},"modified":"2023-09-14T09:26:40","modified_gmt":"2023-09-14T07:26:40","slug":"install-configure-a-nagios-server","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/install-configure-a-nagios-server\/","title":{"rendered":"Install &amp; configure a Nagios Server"},"content":{"rendered":"<h4>What is Nagios ?<\/h4>\n<p>&#8220;Nagios is a powerful monitoring system that enables organizations to identify and resolve IT infrastructure problems before they affect critical business processes.&#8221; https:\/\/www.nagios.org\/<\/p>\n<p>In simple words, you can monitor your servers (linux, MSSSQL, etc &#8230;) and databases (Oracle, SQL Server, Postgres, MySQL, MariaDB, etc &#8230;) with nagios.<\/p>\n<p><a href=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/nagios1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-39895 aligncenter\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/nagios1.png\" alt=\"Nagios architecture\" width=\"552\" height=\"160\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>We use the free version !!! \ud83d\ude00<\/p>\n<p>&nbsp;<\/p>\n<h4>VM configuration :<\/h4>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">OS     : CentOS Linux 7 \nCPU    : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz \nMemory : 3GB \nDisk   : 15GB<\/pre>\n<h4>What we need :<\/h4>\n<ol>\n<li>We need Nagios Core. This is the brain of our Nagios server. All the configuration will be done in this part (set the contacts, set the notification massages, etc &#8230;)<\/li>\n<li>We must install Nagios plugins. Plugins\u00a0are standalone extensions to\u00a0Nagios\u00a0Core that make it possible to monitor anything and everything with Core.\u00a0Plugins\u00a0process command-line arguments, perform a specific check, and then return the results to\u00a0Nagios\u00a0Core<\/li>\n<li>The NRPE addon is designed to allow you to execute Nagios plugins on remote Linux\/Unix machines. The main reason for doing this is to allow Nagios to monitor &#8220;local&#8221; resources (like CPU load, memory usage,etc.) on remote machines. Since these public resources are not usually exposed to external machines, an agent like NRPE must be installed on the remote Linux\/Unix machines.<\/li>\n<\/ol>\n<h4>Preconditions<\/h4>\n<p>All below installation are as root user.<\/p>\n<h4 class=\"brush: text; gutter: true; first-line: 1\">Installation steps<\/h4>\n<ol>\n<li>Install Nagios Core (I will not explain it. Because their documentation is complete)<br \/>\n<a href=\"http:\/\/support.nagios.com\/kb\/article\/nagios-core-installing-nagios-core-from-source-96.html#CentOS\">support.nagios.com\/kb\/article\/nagios-core-installing-nagios-core-from-source-96.html#CentOS<\/a><\/li>\n<li>Install Nagios Plugins\n<p class=\"p1\"><a href=\"https:\/\/support.nagios.com\/kb\/article\/nagios-core-installing-nagios-core-from-source-96.html#CentOS\">support.nagios.com\/kb\/article\/nagios-core-installing-nagios-core-from-source-96.html#CentOS<\/a><\/p>\n<\/li>\n<li>Install NRPE<br \/>\n<a href=\"https:\/\/support.nagios.com\/kb\/article.php?id=515\">https:\/\/support.nagios.com\/kb\/article.php?id=515<\/a><\/li>\n<li>Now you must decide which type of database you want to monitor. Then install the check_health plugin for it (you can install all of them if you want)<br \/>\nHere we install the Oracle and SQL Server check_health<\/li>\n<\/ol>\n<h5>Install and configure Oracle Check_health<\/h5>\n<p><em>You need Oracle client to communicate with an Oracle instance\u00a0<\/em><\/p>\n<ul>\n<li>Download and install check_oracle_health (<a href=\"https:\/\/labs.consol.de\/nagios\/check_oracle_health\/index.html\">https:\/\/labs.consol.de\/nagios\/check_oracle_health\/index.html<\/a>)\n<pre class=\"brush: bash; gutter: true; first-line: 1\">wget https:\/\/labs.consol.de\/assets\/downloads\/nagios\/check_oracle_health-3.2.1.2.tar.gz \ntar xvfz check_oracle_health-3.2.1.2.tar.gz \ncd check_oracle_health-3.2.1.2 \n.\/configure \nmake \nmake install<\/pre>\n<\/li>\n<li>Download and install Oracle Client (here we installed 12c version &#8211;<a href=\"https:\/\/www.oracle.com\/database\/technologies\/oracle12c-linux-12201-downloads.html\"> https:\/\/www.oracle.com\/database\/technologies\/oracle12c-linux-12201-downloads.html<\/a>)<\/li>\n<li>Create check_oracle_health_wrapped file in \/usr\/local\/nagios\/libexec<\/li>\n<li>Set parameters+variables needed to start the plugin check_oracle_health\n<pre class=\"brush: bash; gutter: true; first-line: 1\">#!\/bin\/sh\n### -------------------------------------------------------------------------------- ###\n### We set some environment variable before to start the check_oracle_health script.\n### -------------------------------------------------------------------------------- ###\n### Set parameters+variables needed to start the plugin check_oracle_health:\n\nexport ORACLE_HOME=\/u01\/app\/oracle\/product\/12.2.0\/client_1\nexport LD_LIBRARY_PATH=$ORACLE_HOME\/lib\nexport TNS_ADMIN=\/usr\/local\/nagios\/tns\nexport PATH=$PATH:$ORACLE_HOME\/bin\n\nexport ARGS=\"$*\"\n\n### start the plugin check_oracle_health with the arguments of the Nagios Service:\n\n\/usr\/local\/nagios\/libexec\/check_oracle_health $ARGS<\/pre>\n<\/li>\n<li>Create the tns folder in \/usr\/local\/nagios and then make a tnsnames.ora file and add a tns\n<pre class=\"brush: bash; gutter: true; first-line: 1\">DBTEST =\n  (DESCRIPTION =\n    (ADDRESS = (PROTOCOL = TCP)(HOST = 172.22.10.2)(PORT = 1521))\n    (CONNECT_DATA =\n      (SERVER = DEDICATED)\n      (SID = DBTEST)\n    )\n  )<\/pre>\n<\/li>\n<li>Test the connection\n<pre class=\"brush: actionscript3; gutter: true; first-line: 1\">[nagios@vmnagios objects]$ check_oracle_health_wrapped --connect DBTEST --mode tnsping<\/pre>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h5>Install and configure MSSQL Check_health<\/h5>\n<ul>\n<li>Download and install the check_mssql_health\n<pre class=\"brush: bash; gutter: true; first-line: 1\">wget https:\/\/labs.consol.de\/assets\/downloads\/nagios\/check_mssql_health-2.6.4.16.tar.gz\ntar xvfz check_mssql_health-2.6.4.16.tar.gz\ncd check_mssql_health-2.6.4.16\n.\/configure \nmake \nmake install<\/pre>\n<\/li>\n<li>Download and install freetds\u00a0 (<a href=\"https:\/\/www.freetds.org\/software.html\">www.freetds.org\/software.html)<\/a>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">wget ftp:\/\/ftp.freetds.org\/pub\/freetds\/stable\/freetds-1.1.20.tar.gz\ntar xvfz freetds-1.1.20\n.\/configure --prefix=\/usr\/local\/freetds\nmake\nmake install\nyum install freedts freetds-devel gcc make perl-ExtUtils-CBuilder perl-ExtUtils-MakeMaker<\/pre>\n<\/li>\n<li>Download and install DBD-Sybase\n<pre class=\"brush: bash; gutter: true; first-line: 1\">wget http:\/\/search.cpan.org\/CPAN\/authors\/id\/M\/ME\/MEWP\/DBD-Sybase-1.15.tar.gz\ntar xvfz DBD-Sybase-1.15\ncd DBD-Sybase-1.15\nexport SYBASE=\/usr\/local\/freetds\nperl Makefile.PL\nmake\nmake install<\/pre>\n<\/li>\n<\/ul>\n<ul>\n<li>Add your instance information in : \/usr\/local\/freetds\/etc\/freetds.conf<\/li>\n<\/ul>\n<h4>Configuration steps<\/h4>\n<ol>\n<li>Set your domaine name\n<pre class=\"brush: bash; gutter: true; first-line: 1\">[root@vmnagios ~]# cat \/etc\/resolv.conf\n# Generated by NetworkManager\nsearch exemple.ads\nnameserver 10.175.222.10<\/pre>\n<\/li>\n<li>Set SMPT and Postfix\n<pre class=\"brush: bash; gutter: true; first-line: 1\">[root@vmnagios ~]# \/etc\/postfix\/main.cf\n### ----------------- added by dbi-services ---------------- ###\nrelayhost = http:\/\/smtp.exemple.net\nsmtp_generic_maps = hash:\/etc\/postfix\/generic\nsender_canonical_maps = hash:\/etc\/postfix\/canonical\n-------------------------------------------------------- ###<\/pre>\n<\/li>\n<li class=\"brush: bash; gutter: true; first-line: 1\">Configure Postfix\n<pre class=\"brush: bash; gutter: true; first-line: 1\">[root@vmnagios ~]# cat \/etc\/postfix\/generic\n@localdomain.local dba@exemple.com\n@.exemple.ads dba@exemple.com\n\n[root@vmnagios ~]# cat \/etc\/postfix\/canonical\nroot dba@exemple.com\nnagios dba@exemple.com<\/pre>\n<p>After we need to generate the generic.db and canonical.db<br \/>\n<span style=\"font-family: Consolas, Monaco, monospace\">postmap \/etc\/postfix\/generic<br \/>\n<\/span><span style=\"font-family: Consolas, Monaco, monospace\">postmap \/etc\/postfix\/canonical<\/span><\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<p>Done ! \ud83d\ude42<\/p>\n<p>Now you have a new Nagios Server. All you should do is to configure your client and create a config file on your brand new Nagios server.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>What is Nagios ? &#8220;Nagios is a powerful monitoring system that enables organizations to identify and resolve IT infrastructure problems before they affect critical business processes.&#8221; https:\/\/www.nagios.org\/ In simple words, you can monitor your servers (linux, MSSSQL, etc &#8230;) and databases (Oracle, SQL Server, Postgres, MySQL, MariaDB, etc &#8230;) with nagios. &nbsp; We use the [&hellip;]<\/p>\n","protected":false},"author":27,"featured_media":14110,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[229,59,99],"tags":[143,1525,534,96,1933,51],"type_dbi":[],"class_list":["post-14109","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-database-administration-monitoring","category-oracle","category-sql-server","tag-monitoring","tag-mssql","tag-nagios","tag-oracle","tag-postfix","tag-sql-server"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Install &amp; 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