225 lines
8.7 KiB
Text
225 lines
8.7 KiB
Text
Features
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========
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NUT provides many features, and is always improving.
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Thus this list may lag behind the current code.
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Features frequently appear during the development cycles, so be sure to look at
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the link:http://www.networkupstools.org/download.html[release notes and change logs]
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to see the latest additions.
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////////////////////////////////////////////////////////////////////////////////
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*FIXME* statement that NUT is *the* de facto standard on Opensource system.
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all Linux distributors have standardized the Power Devices support using NUT.
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More and more appliances manufacturers are bundling NUT...
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=> add an Appendix NUT Device Integration in the User Manual
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////////////////////////////////////////////////////////////////////////////////
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Multiple manufacturer and device support
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----------------------------------------
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- Monitors many UPS, PDU and SCD models from more than 100 manufacturers with a
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unified interface (link:stable-hcl.html[Hardware Compatibility List]).
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- Various communication types are supported with the same common interface:
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* serial,
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* USB,
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* network (SNMP, Eaton / MGE XML/HTTP).
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Multiple architecture support
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-----------------------------
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- Cross-platform - different flavors of Unix can be managed together with a
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common set of tools, even crossing architectures.
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- This software has been reported to run on Linux distributions, the BSDs, Apple's
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OS X, Solaris, IRIX, HP/UX, Tru64 Unix, and AIX.
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- Windows users may be able to build it directly with Cygwin.
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There is also a port of the client-side monitoring to Windows called WinNUT.
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- Your system will probably run it too. You just need a good C compiler and
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possibly some more packages to gain access to the serial ports.
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Other features, such as USB / SNMP / whatever, will also need extra software
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installed.
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Layered and modular design with multiple processes
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--------------------------------------------------
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- Three layers: drivers, server, clients.
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- Drivers run on the same host as the server, and clients communicate with the
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server over the network.
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- This means clients can monitor any UPS anywhere as long as there is a network
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path between them.
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WARNING: Be sure to plug your network's physical hardware (switches, hubs,
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routers, bridges, ...) into the UPS!
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Redundancy support - Hot swap/high availability power supplies
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--------------------------------------------------------------
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- upsmon can handle high-end servers which receive power from multiple UPSes
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simultaneously.
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- upsmon won't initiate a shutdown until the total power situation across all
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source UPSes becomes critical (on battery and low battery).
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- You can lose a UPS completely as long as you still have at least the minimum
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number of sources available. The minimum value is configurable.
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Security and access control
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---------------------------
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- Manager functions are granted with per-user granularity. The admin can have
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full powers, while the admin's helper can only do specific non-destructive tasks
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such as a battery test.
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- The drivers, server, and monitoring client (upsmon) can all run as separate
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user IDs if this is desired for privilege separation.
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- Only one tiny part of one program has root powers.
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upsmon starts as root and forks an unprivileged process which does the actual
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monitoring over the network.
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They remain connected over a pipe. When a shutdown is necessary, a single
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character is sent to the privileged process. It then calls the predefined
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shutdown command. In any other case, the privileged process exits.
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This was inspired by the auth mechanism in Solar Designer's excellent popa3d.
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- The drivers and network server may be run in a chroot jail for further
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security benefits. This is supported directly since version 1.4 and beyond with
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the 'chroot=' configuration directive.
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- IP-based access control relies on the local firewall and
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link:http://en.wikipedia.org/wiki/TCP_Wrapper[TCP Wrapper].
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- SSL is available as a build option ("--with-ssl").
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It encrypts sessions with upsd and can also be used to authenticate servers.
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Web-based monitoring
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--------------------
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- Comes stock with CGI-based web interface tools for UPS monitoring and
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management, including graphical status displays.
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- Custom status web pages may be generated with the CGI programs, since they use
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templates to create the pages. This allows you to have status pages which fit
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the look and feel of the rest of your site.
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Free software
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-------------
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- That's free beer and free speech. Licensed under the GNU General Public
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License version 2 or later.
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- Know your systems - all source code is available for inspection, so there are
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no mysteries or secrets in your critical monitoring tools.
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UPS management and control
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--------------------------
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- Writable variables may be edited on higher end equipment for local customizations
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- Status monitoring can generate notifications (email/pager/SMS/...) on alert conditions
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- Alert notices may be dampened to only trigger after a condition persists. This
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avoids the usual pager meltdown when something happens and no delay is used.
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- Maintenance actions such as battery runtime calibration are available where
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supported by the UPS hardware.
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- Power statistics can be logged in custom formats for later retrieval and analysis
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- All drivers are started and stopped with one common program. Starting one is
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as easy as starting ten: 'upsdrvctl start'.
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- Shutdowns and other procedures may be tested without stressing actual UPS
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hardware by simulating status values with the dummy-ups pseudo-driver. Anything
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which can happen in a driver can be replicated with dummy-ups.
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Monitoring diagrams
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-------------------
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These are the most common situations for monitoring UPS hardware. Other ways are
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possible, but they are mostly variants on these four.
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NOTE: these examples show serial communications for simplicity, but USB or SNMP
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or any other monitoring is also possible.
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"Simple" configuration
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~~~~~~~~~~~~~~~~~~~~~~
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image:images/simple.png[]
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One UPS, one computer. This is also known as "Standalone" configuration.
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This is the configuration that most users will use. You need at least a driver,
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upsd, and upsmon running.
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"Advanced" configuration
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~~~~~~~~~~~~~~~~~~~~~~~~
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image:images/advanced.png[]
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One UPS, multiple computers. Only one of them can actually talk to the UPS
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directly. That's where the network comes in. The Master system runs the driver,
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upsd, and upsmon in master mode. The Slave systems only run upsmon in slave mode.
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This is useful when you have a very large UPS that's capable of running multiple
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systems simultaneously. There is no longer the need to buy a bunch of individual
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UPSes or "sharing" hardware, since this software will handle the sharing for you.
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////////////////////////////////////////////////////////////////////////////////
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*FIXME* remainder
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=== One UPS, many clients ===
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- Multiple systems may monitor a single UPS using only their network connections - no special "UPS sharing" hardware is required.
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- "Slave and master" monitoring design synchronizes shutdowns so that slaves can bring down their operating systems cleanly before the master switches off the power.
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=== Many UPSes, many clients ===
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- Each upsd process can serve status data for multiple UPSes to many clients.
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- Each upsmon process can monitor multiple UPSes for status data.
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////////////////////////////////////////////////////////////////////////////////
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"Big Box" configuration
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~~~~~~~~~~~~~~~~~~~~~~~
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image:images/bigbox.png[]
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Some systems have multiple power supplies and cords. You typically find this on
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high-end servers that allow hot-swap and other fun features. In this case, you
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run multiple drivers (one per UPS), a single upsd, and a single upsmon (as
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master for both UPS 1 and UPS 2)
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This software understands that some of these servers can also run with some of
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the supplies gone. For this reason, every UPS is assigned a "power value" - the
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quantity of power supplies that it feeds on a system.
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The total available "power value" is compared to the minimum that is required
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for that hardware. For example, if you have 3 power supplies and 3 UPSes, but
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only 2 supplies must be running at any given moment, the minimum would be 2.
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This means that you can safely lose any one UPS and the software will handle it
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properly by remaining online.
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"Bizarre" configuration
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~~~~~~~~~~~~~~~~~~~~~~~
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image:images/bizarre.png[]
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You can even have a UPS that has the serial port connected to a system that it's
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not feeding. Sometimes a PC will be close to a UPS that needs to be monitored,
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so it's drafted to supply a serial port for the purpose. This PC may in fact be
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getting power from some other UPS. This is not a problem.
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The first system ("mixed") is a Master for UPS 1, but is only monitoring UPS 2.
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The other systems are Slaves of UPS 2.
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Image credits
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-------------
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Thanks to Eaton for providing shiny modern graphics.
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