msgcache - Cache client messages for later pickup by xymonfetch
msgcache implements a Xymon message cache. It is intended for use with
clients which cannot deliver their data to the Xymon server in the
normal way. Instead of having the client tools connect to the Xymon
server, msgcache runs locally and the client tools then deliver their
data to the msgcache daemon. The msgcache daemon is then polled
regularly by the xymonfetch(8) utility, which collects the client
messages stored by msgcache and forwards them to the Xymon server.
NOTE: When using msgcache, the XYMSRV setting for the clients should be
XYMSRV=127.0.0.1 instead of pointing at the real Xymon server.
Clients delivering their data to msgcache instead of the real Xymon
server will in general not notice this. Specifically, the client
configuration data provided by the Xymon server when a client delivers
its data is forwarded through the xymonfetch / msgcache chain, so the
normal centralized client configuration works.
However, other commands which rely on clients communicating directly
with the Xymon server will not work. This includes the config and query
commands which clients may use to fetch configuration files and query
the Xymon server for a current status.
The download command also does not work with msgcache. This means that
the automatic client update facility will not work for clients
communicating via msgcache.
Defines the IP-address and portnumber where msgcache listens for
incoming connections. By default, msgcache listens for
connections on all network interfaces, port 1984.
Restricts which servers are allowed to pick up the cached
messages. By default anyone can contact the msgcache utility
and request all of the cached messages. This option allows only
the listed servers to request the cached messages.
Defines how long cached messages are kept. If the message has
not been picked up with N seconds after being delivered to
msgcache, it is silently discarded. Default: N=600 seconds (10
Run as a daemon, i.e. msgcache will detach from the terminal and
run as a background task
Run as a foreground task. This option must be used when msgcache
is started by xymonlaunch(8) which is the normal way of running
Store the process ID of the msgcache task in FILENAME.
Log msgcache output to FILENAME.
Enable debugging output.