Offloading NDO2DB To Remote Server

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1 Purpose This document is meant to show a step-by-step guide for offloading the NDO2DB daemon from the central server to an external, remote server. NDO2DB is an acronym of "Nagios Data Output To Database" and is a component of NDOUtils. Offloading NDO2B allows the processing of NDO to be offloaded to a server separate to your server. Target Audience This document is intended for use by Nagios Administrators who wish to offload NDO2DB. Requirements To complete this documentation you are required to have already offloaded your databases to an external server as per the following documentation: Offloading MySQL To Remote Server Editing Files In many steps of this documentation you will be required to edit files. This documentation will use the vi text editor. When using the vi editor: To make changes press i on the keyboard first to enter insert mode Press Esc to exit insert mode When you have finished, save the changes in vi by typing :wq and press Enter Page 1 / 11

2 Install Prerequisites The first step is to establish a terminal session to the offloaded database server as a root user. From here execute the following command to install the per-requisite packages: RHEL CentOS Oracle Linux yum install -y gcc make Debian Ubuntu apt-get update apt-get install -y gcc make Download NDO2DB Components This step downloads the tarball that includes the NDO2DB components. Execute the following commands to download the tarball: cd /tmp wget tar xzf xi-latest.tar.gz Note: If you are not running the latest version of then you need to download the tarball that is specific to your version of. Please visit the following page of versions to obtain the URL, use that in the wget command above: Page 2 / 11

3 Install NDO2DB Execute the following commands to install the NDO2DB components: cd nagiosxi/subcomponents/ndoutils tar xf ndoutils tar.gz cd ndoutils mkdir -p /usr/local/nagios/{etc,bin,var}/./configure --with-init-type=sysv make all make fullinstall chown -R nagios.nagios /usr/local/nagios/ mv /usr/local/nagios/etc/ndo2db.cfg-sample /usr/local/nagios/etc/ndo2db.cfg Obtain Settings From Server Before NDO2DB can be configured on the offloaded server we need to obtain the username and password for the nagios database. The best way of obtaining this information is to look at the existing configuration file on the server. Establish a terminal session to your server and execute the following command to obtain this information: grep db_ /usr/local/nagios/etc/ndo2db.cfg The two lines of output required are: db_user=xxxxxxx db_pass=xxxxxxx Obviously xxxxxxx are the values that appear in your output, these are required in the follow steps. Page 3 / 11

4 Configure NDO2DB On Offloaded Server Return to your terminal session on your offloaded server and execute the following command to edit the /usr/local/nagios/etc/ndo2db.cfg file: vi /usr/local/nagios/etc/ndo2db.cfg Find the following: db_user=ndouser db_pass=ndopassword Change these entries to match the username and password you obtained from the server. Find the following lines: socket_type=unix #socket_type=tcp Remote the # from the tcp line and add a # to the unix line: #socket_type=unix socket_type=tcp Save the file once making the changes. You are also required to grant permission in the database to allow the db_user above to the nagios database. Execute the following command to enter the mysql command interface (replace myr00tp@ssw0rd with your MySQL/MariaDB root password): mysql -u root -p'myr00tp@ssw0rd' Page 4 / 11

5 You are now logged into the mysql command interface, this is indicated by the mysql> OR MariaDB [(none0]> prompt. Execute this command to grant the required permission to the nagios database: GRANT ALL ON nagios.* TO IDENTIFIED BY Where: = the db_user identified earlier IDENTIFIED BY = the db_pass identified earlier You can now quit the mysql command interface. quit; The database has been updated and you are ready to proceed to the next step. Adjust Firewall Rules To Allow The NDO2DB Traffic Firewall rules need to be added to allow the NDO2DB traffic. These steps are performed on your offloaded server. In the following commands you need to replace <IP_OF_NAGIOS_XI_SERVER> with the IP Address of your server, for example ' '. RHEL 6.x CentOS 6.x Oracle Linux 6.x iptables -I INPUT -s <IP_OF_NAGIOS_XI_SERVER> -p tcp --dport j ACCEPT service iptables save Page 5 / 11

6 RHEL 7.x CentOS 7.x Oracle Linux 7.x These first three lines are to be typed as one long command. firewall-cmd --zone=public --add-rich-rule="rule family="ipv4" source address="<ip_of_nagios_xi_server>" port protocol="tcp" port="5668" accept" --permanent firewall-cmd --reload Ubuntu ufw allow proto tcp from <IP_OF_NAGIOS_XI_SERVER> to any port 5668 ufw reload Debian iptables -I INPUT -s <IP_OF_NAGIOS_XI_SERVER> -p tcp --dport j ACCEPT Start NDO2DB Service Now that NDO2DB has been configured you can enable the service so it starts when the server boots. You will also start the service at this point RHEL 6.x CentOS 6.x Oracle Linux 6.x service ndo2db start chkconfig --add ndo2db chkconfig ndo2db on service ndo2db status This should show NDO2DB running. Page 6 / 11

7 RHEL 7.x CentOS 7.x Oracle Linux 7.x Debian Ubuntu 16.x/18.x systemctl daemon-reload systemctl start ndo2db.service systemctl enable ndo2db.service systemctl status ndo2db.service This should show NDO2DB running. Ubuntu 14.x service ndo2db start update-rc.d ndo2db defaults service ndo2db status This should show NDO2DB running. Configure Server Next you need to configure the server to use the offloaded NDO2DB server. Return to your terminal session on the server and execute the following command to edit the /usr/local/nagios/etc/ndomod.cfg file: vi /usr/local/nagios/etc/ndomod.cfg Find the following lines: #output_type=file #output_type=tcpsocket output_type=unixsocket Page 7 / 11

8 Remote the # from the tcpsocket line and add a # to the unixsocket line: #output_type=file output_type=tcpsocket #output_type=unixsocket Find the following: output=/usr/local/nagios/var/ndo.sock Change this to the IP address of your offloaded NDO2DB server, for example: output= Save the file once making the changes. The /usr/local/nagiosxi/html/config.inc.php file needs to be updated, execute the following command to edit the file: vi /usr/local/nagiosxi/html/config.inc.php The following line needs to be added to the file: $cfg["ndo2db_offloaded"] = true; If it already exists then change it to true, otherwise add it to the end of the file. Save the file once making the changes. Page 8 / 11

9 Restart Nagios Services Now you need to restart the Nagios services so they use the new NDO2DB service. The steps below are to stop the existing services and then start nagios. RHEL 6.x CentOS 6.x Oracle Linux 6.x Ubuntu 14.x service nagios stop service ndo2db stop service nagios start service nagios status This should show Nagios running. RHEL 7.x CentOS 7.x Oracle Linux 7.x Debian Ubuntu 16.x/18.x systemctl stop nagios.service systemctl stop ndo2db.service systemctl start nagios.service systemctl status nagios.service This should show Nagios running. Test To ensure everything is working correctly you should log into. An easy way to confirm NDO2DB is working is to navigate to the Host Status Details for the localhost object. Under Quick Actions click the Force immediate check link and watch the "Last Check" and "Next Check" rows in the Status Details table. Both of these should update quickly, if not please refer to the Troubleshooting section. Page 9 / 11

10 Disable ndo2db Service The last step is to disable the old un-used ndo2db service on the server. RHEL 6.x CentOS 6.x Oracle Linux 6.x chkconfig ndo2db off RHEL 7.x CentOS 7.x Oracle Linux 7.x Debian Ubuntu 16.x/18.x systemctl disable ndo2db.service Ubuntu 14.x update-rc.d -f ndo2db remove This completes the steps required to offload NDO2DB to an external server. Troubleshooting If you experience issues following this documentation then you can refer to the logs on both the server and the offloaded server: tail -f /var/log/messages Here is an example log from the server: Mar 16 15:21:07 xi-c6x-x64 nagios: ndomod: Error writing to data sink! Some output may get lost... Mar 16 15:21:07 xi-c6x-x64 nagios: ndomod: Please check remote ndo2db log, database connection or SSL Parameters Page 10 / 11

11 Here is the corresponding log from the offloaded server: Mar 16 15:21:03 mysql-c6x-x64 ndo2db: Error: Could not connect to MySQL database: Access denied for user (using password: YES) The logs above indicate that there was an issue with the NDO2DB service on the offloaded server connection to the database. You need to make sure that the correct steps have been followed in the Configure NDO2DB On Offloaded Server section of this documentation. Finishing Up This completes the documentation on how to offload NDO2DB to an external server for. If you have additional questions or other support related questions, please visit us at our Nagios Support Forums: The Nagios Support Knowledgebase is also a great support resource: Page 11 / 11

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