[Xymon] How Xymon invokes an SSH connection to the Client?

[Jeremy Laidman]

>
> Please what script trigger the SSH tests that are built into the services
> that Xymon uses.
>

The SSH test, and all of the other network-probe tests (ping, http, etc)
are performed by the xymonnet program.  This is launched by the xymonlaunch
supervisor process, by default once every 5 minutes.  The execution
parameters are defined in the tasks.cfg file, in the [xymonnet] section.

The way it works is this.  When xymonnet runs, it looks in protocols.cfg
and builts up its suite of TCP tests from there, such as "smtp" and "ssh".
It also has built-in the three special non-TCP tests "ping", "dns" (or
"dig") and "ntp".  Next, xymonnet scans the hosts file for any host with a
tag matching any of these defined test names.  And then it runs through
each test for each host having that test.

It's actually slightly more complicated than that, but it's functionally
equivalent to how I've explained it.  For more of the details, refer to the
man page for xymonnet, and read the "XYMONNET INTERNALS" section.

The "ssh" test is defined in protocols.cfg as follows:

[ssh|ssh1|ssh2]
   send "SSH-2.0-OpenSSH_4.1\r\n"
   expect "SSH"
   options banner
   port 22

This defines the port (which can be overridden per host in hosts.cfg) and
whether the status page should show the response received after sending the
"send" string.  The "send" string gets sent to the remote server being
subjected to the test.  The "expect" string is matched against the response
(banner) and if successful, the status goes green, otherwise red.  Or if
the TCP socket fails to connect, the status goes red.

Is there a particular problem you're trying to solve?  If you would like
some more relevant help, perhaps you could explain what you're trying to
do, and what you are expecting to happen but is not.

Cheers
Jeremy
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