{"id":2383,"date":"2013-11-06T14:28:03","date_gmt":"2013-11-06T20:28:03","guid":{"rendered":"https:\/\/secure.rosehosting.com\/blog\/?p=2383"},"modified":"2022-06-03T03:47:18","modified_gmt":"2022-06-03T08:47:18","slug":"install-nagios3-on-ubuntu-13-10-vps-for-monitoring-virtual-servers-and-services","status":"publish","type":"post","link":"https:\/\/www.rosehosting.com\/blog\/install-nagios3-on-ubuntu-13-10-vps-for-monitoring-virtual-servers-and-services\/","title":{"rendered":"Install Nagios3 on Ubuntu 13.10 VPS for monitoring virtual servers and services"},"content":{"rendered":"
<\/div>

\"install-nagios3-on-ubuntu-13-10-vps-for-monitoring-virtual-servers-and-services\"<\/a>In the following article we will guide you through the steps on how to install Nagios3<\/a> on a Ubuntu 13.10 VPS<\/a><\/strong> so you can monitor your virtual servers<\/a> and services<\/strong> from your VPS<\/strong>.<\/p>\n

Nagios3<\/strong> is a robust and very powerful monitoring system which can help you monitor your virtual servers<\/strong> and the services running on your servers.<\/p>\n

It is one of the best open-source monitoring systems out there.<\/p>\n

<\/p>\n

Before proceeding any further, initiate a screen session by executing:<\/p>\n

## screen -U -S nagios-screen<\/pre>\n
Then, make sure your Ubuntu 13.10 VPS<\/a> is fully up-to-date by executing:<\/p>\n
## apt-get update\n## apt-get upgrade<\/pre>\n
If Apache2 is not installed on your vps, run the command below to install it:<\/p>\n
## apt-get install apache2<\/pre>\n
Next thing to do, is to install Nagios and Nagios NRPE (Nagios Remote Plugin Executor) Plugins on your VPS by running:<\/p>\n
## apt-get install nagios3 nagios-nrpe-plugin<\/pre>\n
you should be prompted to enter your nagiosadmin<\/code> user’s password as shown below<\/p>\n
\"Nagios<\/a><\/p>\n
if for some reason you’re not, then use the following command to set your nagiosadmin<\/code> user’s password:<\/p>\n
## htpasswd -c \/etc\/nagios3\/htpasswd.users nagiosadmin<\/pre>\n
proceed with adding Apache’s www-data<\/code> user to the nagios<\/code> group:<\/p>\n
## usermod -a -G nagios www-data<\/pre>\n
add executable bit for nagios group<\/code> to everything under the \/var\/lib\/nagios3\/<\/code> directory:<\/p>\n
## chmod -R g+x \/var\/lib\/nagios3\/<\/pre>\n
next, edit Nagios3 configuration file in \/etc\/nagios3\/nagios.cfg<\/code> and enable external commands by setting check_external_commands<\/code> from 0 to 1:<\/p>\n
## vim +\/check_external_commands \/etc\/nagios3\/nagios.cfg<\/pre>\n
restart Nagios and Apache and access your Nagios at http:\/\/your.hostname.com\/nagios3<\/a><\/p>\n
## service apache2 restart\n## service nagios3 restart<\/pre>\n
\n
Adding servers or services to nagios is done by creating a configuration file for a particular host. In this case, lets monitor a CentOS VPS<\/a> (my.hostname.com<\/code>) and some of the services running on it from your Nagios. So, create a configuration file for this VPS:<\/p>\n
## cd \/etc\/nagios3\/conf.d\n## vim my.hostname.com.cfg<\/pre>\n
and add the following:<\/p>\n
define host {\n    use                      generic-host\n    host_name                my.hostname.com\n    alias                    host-cosini\n    address                  XXX.XXX.XXX.XXX\n}\n\ndefine service {\n    use                      generic-service\n    host_name                my.hostname.com\n    service_description      HTTP\n    check_command            check_http\n}\n\ndefine service {\n    use                      generic-service\n    host_name                my.hostname.com\n    service_description      SSH\n    check_command            check_ssh!2219!\n    notifications_enabled    0\n}\n\ndefine service {\n    use                      generic-service\n    host_name                my.hostname.com\n    service_description      PING\n    check_command            check_ping!100.0,20%!500.0,60%\n}\n\ndefine service {\n    use                      generic-service\n    host_name                my.hostname.com\n    service_description      LOAD\n    check_command            check_nrpe_1arg!check_load\n}\n\ndefine service {\n    use                      generic-service\n    host_name                my.hostname.com\n    service_description      FTP\n    check_command            check_nrpe_1arg!check_ftp\n}\n\ndefine service {\n    use                      generic-service\n    host_name                my.hostname.com\n    service_description      DISK\n    check_command            check_nrpe_1arg!check_storage\n}<\/pre>\n
save and close the file and restart nagios3 for the changes to take effect:<\/p>\n
## service nagios3 restart<\/pre>\n
access http:\/\/your.hostname.com\/cgi-bin\/nagios3\/status.cgi?host=all
\n<\/a> and see if the new server is shown in the interface.<\/p>\n
In order to monitor some of the services running on our client CentOS 6 VPS<\/a>, we need to install and configure NRPE on the server. To do that, first we need to enable the EPEL repository and install the packages by:<\/p>\n
## rpm -Uvh http:\/\/dl.fedoraproject.org\/pub\/epel\/6\/x86_64\/epel-release-6-8.noarch.rpm\n## yum install nrpe nagios-plugins-all<\/pre>\n
once installed, we need to configure NRPE by editing \/etc\/nagios\/nrpe.cfg<\/code>:<\/p>\n
allowed_hosts=127.0.0.1\nchange to\nallowed_hosts=127.0.0.1,XXX.XXX.XXX.XXX<\/pre>\n
where XXX.XXX.XXX.XXX is your Nagios VPS IP address<\/i><\/p>\n
add\/edit the following command:<\/p>\n
command[check_ftp]=\/usr\/lib\/nagios\/plugins\/check_procs -a proftpd\ncommand[check_storage]=\/usr\/lib\/nagios\/plugins\/check_disk -w 20% -c 10% -p \/<\/pre>\n
enable NRPE on system start-up and start the service:<\/p>\n
## chkconfig nrpe on\n## service nrpe start<\/pre>\n
Of course, if you are one of our Linux VPS Hosting<\/a> customers, you don\u2019t have to do any of this, simply ask our admins, sit back and relax. Our admins will set this up for you immediately. For more updates, you can also read our guide on How to install Nagios3 and Check_MK on an Ubuntu 12.04 LTS VPS.<\/a><\/p>\n
PS.<\/strong> If you liked this post please share it with your friends on the social networks using the buttons on the left or simply leave a reply below. Thanks.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the following article we will guide you through the steps on how to install Nagios3 on a Ubuntu 13.10 … <\/p>\n
Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":2384,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1703,13,1698],"tags":[34,177,317,318,1152,200],"class_list":["post-2383","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-security","category-tutorials","category-ubuntu","tag-centos","tag-linux-vps","tag-nagios","tag-nrpe","tag-rosehosting","tag-ubuntu-vps","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-33"],"yoast_head":"\nInstall Nagios3 on Ubuntu 13.10 VPS for monitoring virtual servers and services | RoseHosting<\/title>\n<meta name=\"description\" content=\"Install Nagios3 on Ubuntu 13.10 VPS for monitoring virtual servers and services | RoseHosting\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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