Nagios-RSV Alarm System Sarah Williams OSG Site Admins Workshop at - - PowerPoint PPT Presentation

Nagios-RSV Alarm System

Sarah Williams OSG Site Admin’s Workshop at SLAC Nov 14, 2008

March 2, 08

Prerequisites

• Working RSV install
• Working Nagios install

OR

• Rpm-based linux server on which to install Nagios

CHECKPOINT Does everyone have these? Can you access them via http(s) and ssh?

March 2, 08

Install Nagios and Apache

• Set up your installation tool of choice to use the Dag repository:

http://dag.wieers.com/rpm/FAQ.php#B1 OR

• Download the latest Nagios and Nagios-plugin rpm for your

distro: http://dag.wieers.com/rpm/packages/nagios/ http://dag.wieers.com/rpm/packages/nagios-plugins/

• Install the apache rpm using your preferred install tool. Example:

%yum install httpd OR

• Direct download the appropriate apache rpm for your distro.

http://rpm.pbone.net/

March 2, 08

Install Nagios and Apache (cont.)

• Add web accounts:

% htpasswd -c /etc/nagios/htpasswd.users sarah % htpasswd -c /etc/nagios/htpasswd.users nagios

• Add rights to your viewing account by editing /etc/nagios/cgi.cfg

and adding: authorized_for_all_services=nagiosadmin,sarah authorized_for_all_hosts=nagiosadmin,sarah

• Start Nagios & Apache:

% /etc/init.d/nagios start % /etc/init.d/httpd start

March 2, 08

CHECKPOINT

• Can you view your Nagios interface?

Ex: http://iut2-c082.iu.edu/nagios/ If you get ‘connection refused’, you may need to open port 80 in your firewall. If you are behind a campus firewall, you can run lynx from inside your terminal: % lynx http://iut2-c082.iu.edu/nagios/

• Can you authenticate with both usernames?
• Click ‘Service Detail’ in the sidebar. Do you see localhost with 8

services?

• If you get a misconfiguration error, it may be an selinux issue.

Try % setenforce 0 Which temporarily disables selinux. If you want to run both selinux and nagios, this guide may help: http://www.rickwargo.com/2006/10/29/fc6-selinux-and-nagios/

March 2, 08

Configure RSV

• Edit

$VDT_LOCATION/osg-rsv/config/rsv-nagios.conf

• Ignore ‘short_hostname’ – this is no longer used.

## Your Nagios server coordinates NAGIOS_URL: http://nagios-server.domain.edu/ nagios/cgi-bin/cmd.cgi NAGIOS_USERNAME: nagios-username NAGIOS_PASSWORD: nagios-password

March 2, 08

Configure RSV (cont.)

• Download the newest version of the rsv2nagios.py file:

wget http://repo.mwt2.org/viewvc/rsv/nagios/ rsv2nagios.py -O $VDT_LOCATION/osg-rsv/bin/ misc/rsv2nagios.py chmod a+x $VDT_LOCATION/osg-rsv/bin/misc/ rsv2nagios.py Note: After VDT 1.10.1n is released (around Nov 17 2008), you will no longer need to download this file.

• Enable the Nagios consumer:

% $VDT_LOCATION/osg-rsv/setup/configure_osg_rsv -- verbose --consumers --setup-rsv-nagios

• Restart osg-rsv:

% vdt-control –off osg-rsv % vdt-control –on osg-rsv

March 2, 08

CHECKPOINT

• Is the nagios-consumer process

running? % ps –Afwww | grep nagios- consumer

March 2, 08

Configure Nagios

• Create a Nagios contact and contact group by editing /etc/nagios/objects/contacts.cfg

and adding: define contact{ contact_name sarah use generic-contact alias Sarah Wililams email saewill@iupui.edu can_submit_commands 1 } define contact{ contact_name nagios use generic-contact can_submit_commands 1 } define contactgroup{ contactgroup_name rsv-admins alias RSV Administrators members sarah,nagios }

March 2, 08

Configure Nagios (cont.)

• Create the file /etc/nagios/objects/service-groups.cfg and add:

define servicegroup{ servicegroup_name Critical_Services alias Critical Services } define servicegroup{ servicegroup_name RSV alias RSV Probe Results }

• Edit /etc/nagios/nagios.cfg to add:

cfg_file=/etc/nagios/objects/service-groups.cfg

• Edit /etc/nagios/objects/commands.cfg to add:

define command{ command_name check_dummy command_line $USER1$/check_dummy $ARG1$ $ARG2$ }

March 2, 08

CHECKPOINT

• Do a Nagios pre-flight check for syntax

errors: % nagios -v /etc/nagios/ nagios.cfg

March 2, 08

Configure Nagios (cont.)

• Make a work directory:

% mkdir /etc/nagios/rsv/ ; cd /etc/nagios/rsv/

• Download rsv_config.pl and passive-template.cfg

% wget

http://repo.mwt2.org/viewvc/rsv/nagios/rsv_config.pl

% wget

http://repo.mwt2.org/viewvc/rsv/nagios/passive- template.cfg

% chmod u+x /etc/nagios/rsv/rsv_config.pl

March 2, 08

Configure Nagios (cont.)

• Edit passive-template.cfg to replace CONTACTGROUP with the

name of your contact group (rsv-admins)

• Generate the Nagios config file for rsv:

% /etc/nagios/rsv/rsv_config.pl >/etc/nagios/ rsv.cfg CHECKPOINT rsv_config.pl prints a list of hosts and services to the terminal. Were there any errors?

March 2, 08

Configure Nagios (cont.)

• Edit /etc/nagios/nagios.cfg to include the rsv.cfg file:

cfg_file=/etc/nagios/rsv.cfg

• Adjust these file ownerships:

chgrp apache /var/nagios/rw chgrp apache /var/nagios/rw/nagios.cmd chmod g+s /var/nagios/rw/ CHECKPOINT

• Do a Nagios pre-flight check for syntax errors:

% nagios -v /etc/nagios/nagios.cfg

• Restart Nagios:

% /etc/init.d/nagios restart

• Check your webconsole.

Ex: http://iut2-c082.iu.edu/nagios/ Can you see the hosts and services defined in RSV, labeled ‘PASV’ and state ‘PENDING’?

March 2, 08

Final Checks

• Login to your RSV host and check

$VDT_LOCATION/osg-rsv/logs/ consumers/nagios-consumer.log. Any errors?

• Check your webconsole again. Are

results coming in? org.osg.general.osg- version is one of the most frequent probes, so it should come up quickly.

• Are you receiving emails?

March 2, 08

Finished!

• Any questions?