Nagios Conference 2014 - Eric Mislivec - Getting Started With Nagios Core
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The document is a comprehensive guide to getting started with Nagios Core, covering its features, architecture, installation, and configuration. It outlines system requirements, installation steps for Nagios core and plugins, and provides resources for further learning and support. It emphasizes the importance of monitoring and alerting in IT management and how to engage with the Nagios community.
Nagios Conference 2014 - Eric Mislivec - Getting Started With Nagios Core
- 1. Getting Started with Nagios Core Eric Mislivec emislivec@nagios.com
- 2. The Plan ● What is Nagios Core? ● Features & Benefits ● Architecture ● Installation & Configuration ● Resources & Support ● Get Involved ● Questions
- 3. What is... ● The Standard in Open Source IT Monitoring ● 15+ years ● A monitoring and alerting engine ● Why we're here
- 4. Comprehensive Monitoring ● A few 'Nagiosable' things – System metrics – Service status – Applications – Network devices ● ??? – “There's a check for that.” ● Network / logical hierarchy
- 5. Visibility
- 6. Alerting & Awareness ● Multiple methods ● email, SMS, ... ● Customizable ● Targetable ● Escalations for multi-user setups ● Schedule downtime, avoid false alerts
- 7. Problem Remediation ● Acknowledge problems online ● Event handlers for automation
- 8. Reporting
- 9. Extendable Architecture ● List of 'objects' to monitor ● Schedule of things to do ● Run checks, other commands ● Other work as requested
- 10. Objects ● Hosts & Host Groups ● Services & Service Groups ● Contacts & Contact Groups ● Commands ● Time Periods ● Notification Escalations ● Notification and Execution Dependencies
- 11. Checks ● Active ● Initiated by Nagios process ● Regularly scheduled ● On demand ● Passive ● Initiated externally ● Results sent to Core
- 12. Formats & APIs ● Configurable commands ● Plugin / check result format ● Performance data ● External commands ● Query handler ● Check results spool ● CGIs, now with JSON
- 13. NEBs ● Nagios Event Broker Modules ● Loaded into Core on startup ● Hook into key steps ● Can override or cancel some ● Examples ● Distribute checks: mod_gearman ● Export data: NDOUtils
- 14. That's Nice, but... ...how do I get started?
- 15. Installation - 'Soft' Requirements ● UNIX OS: Linux, BSD, OS X, Solaris, AIX, … ● C compiler & development tools ● Web server, PHP, gd (CGIs) ● Network access
- 16. Installation - 'Hard' Requirements General Monitoring Minimum Recommended Processor 1 GHz 2 GHz+ Memory 512 MB 1 GB+ Storage 512 MB 2 GB+ ...or a Raspberry Pi... Depends on rate and type of checks
- 17. Installation - Before We Begin... WARNING: Comand Line Follows! It doesn't last forever Let's install Core on CentOS 6.5 Minimal
- 18. Installation - Prerequisites # Install dependencies for Core and popular plugins yum install -y autoconf automake gcc glibc glibc-common make wget fping bind-utils net-snmp net-snmp-utils perl-Net-SNMP samba-client openssl-devel openssh-devel mysql-devel gettext gd gd-devel httpd php # Setup users and groups groupadd nagcmd useradd nagios -s /sbin/nologin -M -d /usr/local/nagios/ -U -G nagcmd usermod -a -G nagcmd apache usermod -a -G nagios apache
- 19. Installation - Nagios Plugins ● Official collection of common plugins – nagios-plugins.org # Get the Nagios Plugins source code cd /tmp wget http://nagios-plugins.org/download/nagios-plugins-2.0.3.tar.gz tar xzvf nagios-plugins-2.0.3.tar.gz cd nagios-plugins-2.0.3 # Build and install the plugins ./tools/setup ./configure --with-nagios-user=nagios --with-nagios-group=nagios make && make install
- 20. Installation - Nagios Core # Get the Nagios Core source code cd /tmp wget http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-4.0.8.tar.gz tar xzvf nagios-4.0.8.tar.gz cd nagios-4.0.8 # Build and Install Nagios Core ./configure --with-command-group=nagcmd --with-nagios-group=nagios make all make install install-init make install-config make install-commandmode make install-webconf # Setup credentials for accessing the web backend. sudo -u nagios htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
- 21. Installation - System Setup # SELinux is enforcing by default on CentOS. Disable it for this example. setenforce 0 # Open up ports for HTTP. We use -I to insert the new rules at the head of # the INPUT chain; -A adds them at the tail, possibly after a REJECT rule. iptables -I INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT service iptables save # Now (re)start our services to use the new configuration. service httpd restart service nagios start # Have our services start automatically. chkconfig nagios on chkconfig httpd on
- 22. Installation - Try It Out
- 23. Installation - Try It Out
- 24. Anatomy of an Installation ● /usr/local/nagios/ ● bin/ - Nagios Core binaries ● etc/ - Configuration files ● libexec/ - Plugins, event handlers, cmds ● sbin/ - CGI binaries ● share/ - Web UI files ● var/ - Runtime files, data, logs
- 25. etc/nagios.cfg ● General program settings ● File paths ● NEBs to load ● Loading other configuration # You can specify individual config files: cfg_file=/usr/local/nagios/etc/objects/commands.cfg cfg_file=/usr/local/nagios/etc/objects/contacts.cfg cfg_file=/usr/local/nagios/etc/objects/timeperiods.cfg cfg_file=/usr/local/nagios/etc/objects/templates.cfg # Configuration for multiple hosts: cfg_dir=/usr/local/nagios/etc/hosts
- 26. Configuration Basics ● Basic format define someobjecttype { some_variable Some text another_variable 1234 }
- 27. A Partial Template Example ● Template define host { check_command check-host-alive notification_options d,u,r max_check_attempts 5 name host_template register 0 } ● Host define host { use host_template host_name example-host alias Partial Host Example host_address 127.0.0.1 }
- 28. A Real Host Template define host { name generic-host ; Name of this host template notifications_enabled 1 ; Host notifications are enabled event_handler_enabled 1 ; Host event handler is enabled flap_detection_enabled 1 ; Flap detection is enabled process_perf_data 1 ; Process performance data retain_status_information 1 ; Keep status info across restarts retain_nonstatus_information 1 ; Keep non-status info across restarts notification_period 24x7 ; Send host notifications at any time register 0 ; Don't register, this is a template! }
- 29. More configuration ● Where to from here? ● Sample config: etc/ ● Experiment ● Core Manual nagios.sourceforge.net/docs/nagioscore/4/en/ toc.html
- 32. General Support Forum support.nagios.com/forum
- 33. Professional Support Contracts www.nagios.com/services/support
- 34. Additional Solutions & Services Preconfigured VMs www.nagios.org/download/core Consulting / Implementation Services sales@nagios.com
- 35. Additional Services Training go.nagios.org/training Certification www.nagios.com/services/certification
- 37. Get Involved ● Learn, share and help on the forums support.nagios.com/forum ● Share on Exchange exchange.nagios.org ● We're on GitHub github.com/NagiosEnterprises github.com/NagiosEnterprises/nagioscore
- 38. Summary ● Enables comprehensive monitoring ● Awarness, visibility, resolution, reporting ● Extensible architecture ● Installation ● Introduction to configuration concepts ● Where to find more resources ● How to contribute
- 39. Questions?
- 40. Thank You Eric Mislivec emislivec@nagios.com
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