sinfo-Advanced Network Monitoring

 in

Are you looking to set up some kind of network cluster, but dealing with many different computers, all of which are nearly impossible to keep track of? What if you're in charge of a room full of computers and also of those who are using them (some of whom may be looking to slack off or run something I'll politely dub "objectionable")? sinfo may be what you're looking for. According to its Freshmeat entry:

sinfo is a monitoring tool that uses a broadcast scheme to distribute information on the status of each computer on your local network. It supports CPU, memory usage, network load and information about the top five processes on each computer. sinfo uses ncurses to display the information in an attractive manner.

sinfo displays invaluable system information over multiple PCs for easy administration.

Further extending sinfo's use with the -s switch provides even meatier information.

Installation

A binary is available for those with Debian-based systems, such as Debian, Ubuntu and the like, and chances are that it's already sitting in your repository. Given that this software also includes a startup dæmon, sinfod, I thoroughly recommend taking the binary option if you can, because a great deal of the process is automated (it's also the version I cover here). Nevertheless, in the interests of distro neutrality, I also cover the source version during the installation, as usual.

As far as library requirements are concerned, you need the following, according to the documentation:

  • ncurses: libraries for terminal handling (tested with version 5.7).

  • boost: peer-reviewed portable C++ source libraries using Boost.Bind and Boost.Signals (tested with version 1.42).

  • asio (>=1.1.0): asio is a cross-platform C++ library for network programming (tested with version 1.4.1).

If you're compiling from source, you need the pesky developer packages as well (-dev). The number of packages under libboost- in particular are quite extensive, so if you run into any problems during make, the libboost libraries may be the culprit, requiring more of its packages before you can install properly.

For those running with source, once you have the library requirements out of the way, grab the latest tarball and extract it. Open a terminal in the new folder and enter the following commands:


$ ./configure
$ make

If your distro uses sudo:


$ sudo make install

If your distro uses root:


$ su
# make install

Before I continue, I should explain that sinfo is broken into two parts: the everyday application and the background dæmon. As for installing the dæmon, I'm going to leave this part to you, because it seems that just about every distro has a different method of dealing with startup processes (and the Debian package takes care of all that). Check the readme files in the source tarball and the Web site for more information if you're still using the source.

Usage

sinfo is a "semi-GUI" command-line program that's actually pretty easy to use, although advanced users can make it do some pretty cool stuff via command-line switches. To run the program in its basic mode, simply enter:


$ sinfo

Assuming that you have sinfo installed only on your machine for now, the information being displayed will be just that of your machine. From this screen, you see all kinds of useful information, such as available memory, CPU utilization, hostnames and so on. The sinfo Keyboard Commands sidebar shows a list of the keyboard commands that drive sinfo, toggling parts of the program with a single keystroke.

However, in this state, it's really just a glorified version of top. The whole point is that you can display information from several machines at once to keep tabs on a LAN. If the other PCs on your network have sinfo in their distro's repository, it should be as easy as installing sinfo via apt-get and the like, then running the program on those machines. As soon as I did that on a second machine, voilà, both PCs were displaying under both installations. Keep installing it on other networked PCs, and the list will grow larger and larger.

Those are the basics out of the way, but what about the extended features? Obviously, I don't have the space to cover everything here (and you really should check the man page for more details), but let's look at some of my favorite features.

At the command line, if you add the -W switch (or alternatively --wwwmode) like so:


$ sinfo -W

the output changes from the usual top-like screen to HTML output instead—very handy for those into things like remote administration with automated Web pages and whatnot.

This is slightly redundant while in the sinfo user interface (simply press the s key), but it's awesome when doing some kind of command-line scripting: add the switch -s (or alternatively --systeminfo), and a big chunk of serious system information is output as well. As an example, my two machines had the following extra information:


192.168.1.2   knightro-bigdesktop i686 
 ↪Linux 2.6.32-27-generic #49-Ubuntu SMP Wed De
cpus: 4  MHz:  800.0
RAM: 3276.5 MByte   swap: 7629.4 Mbyte
load 1min:  0.0   load 5min:  0.1   load 15min:  0.1

192.168.1.1   nhoj-desktop x86_64 
 ↪Linux 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 0
cpus: 2  MHz: 1000.0
RAM: 2007.6 MByte   swap: 2047.3 Mbyte
load 1min:  0.1   load 5min:  0.2   load 15min:  0.1
uptime     0 days, 19:13:03

This kind of information suggests many potential uses, and keeping watch and troubleshooting at LAN parties springs instantly to mind. If any one node is having trouble, there's a good chance that the host will be able to hit the ground running when trying to isolate the problem.

In the end, sinfo is not only well designed, but if it's installed as binary, it's also convenient. Ultimately, I think this application will carve out an instant niche for itself, and hopefully, it will turn into one of those standard applications that are so commonplace, they just become part of the landscape. Maybe porting it would do exactly that.

sinfo Keyboard Commands

  • q — quit sinfo.

  • Page up, Page down — scroll the screen by one page.

  • Up arrow/u, down arrow/d — scroll the screen by one line.

  • Home — jump to the top line.

  • s — toggle display of system information.

  • o — toggle display of your own processes.

  • n — toggle display of network information.

  • D — toggle display of disk load.

  • t — toggle display of the top X processes.

  • c — toggle the scaling of the CPU load bars from "log", "lin" to full.

More about sinfo: http://www.ant.uni-bremen.de/whomes/rinas/sinfo

Brewing something fresh, innovative or mind-bending? Send e-mail to newprojects@linuxjournal.com.

______________________

John Knight is the New Projects columnist for Linux Journal.

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Looks like a nice tool for

UK Hosting's picture

Looks like a nice tool for keeping an eye on network resources, although I think the likes of Niagos / Icinga are more useful for larger enterprise use.

Something's missing

vichardy's picture

I use ubuntu and it's in the repositories. I installed it OK using apt-get, but there's no data. Running basic sinfo shows no data:

/ 0 nodes, 0 CPUs total CPU utilization: -nan% ( 0.000 GHz / 0.000 GHz )

Trying to pick up one of my other machines (that have sinfo installed) either defaults to the local machine with above result, or if I include a port I get:

receive error: Host not found (authoritative).

Anyway, it seems like a useful utility as I have 4 machines on my local network, but so far I'm not able to get it to work...

Thanks

Stew's picture

Thanks for the article. Works well on my server but on my netbook (wireless) the daemon exits silently. When I run it with -F I get:

[root@acer ~]# sinfod -n wlan0 -F
sinfod 0.0.43 (compiled Nov 26 2011 08:43:00)
Exception: Address family not supported by protocol

And the client app never shows any display.

Didn't find anything about the exception with google.

Great List of Knowledge

alica2011's picture

I think is newbie but this article make me try to became expert.thanks

thanx

Benz's picture

thanks for this one, i have to give it a try. Network monitoring can turn as hell, and i'm always in need to some helpfull softs

nagios

bibi's picture

You could also give 'nagios' a try

nagios

Benz's picture

I do.... i use centreon, but i find it a real pain to use.
And most of all, it is so poorly documented....

Ooh! Is this app light on

noelrobichaud's picture

Ooh!

Is this app light on it's feet? How does it compare to central logging? Central logging can easily be parsed, but is still a chore to filter out false-positives.

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