Remote Access to a Midas experiment

mserver provides remote access to any MIDAS client. It is needed when one or more of the MIDAS clients for an experiment are running on a different host. In this case, an mserver client must be started on the host where the experiment resides.

For example, if there is no mserver client is running on host dasdevpc2, then an attempt to run a client on dasdevpc2 from a remote computer (isdaq01) will result in an error message:

[bnmr@isdaq01 ~/online]$ odb -e t2kgas -h dasdevpc2 Cannot connect to remote host If an mserver client is now started on host dasdevpc2,

[suz@dasdevpc2 ~]$ mserver -D mserver started interactively Becoming a daemon... Now one can connect to the remote experiment :

[bnmr@isdaq01 ~/online]$ odb -e t2kgas -h dasdevpc2 [dasdevpc2:t2kgas:S]/>quit The mserver utility usually runs in the background and doesn't need to be modified. In the case where debugging is required, the mserver can be started with the -d flag which will write an entry for each transaction to a log file /tmp/mserver.log . The log entry contains the time stamp and RPC call request. More than one mserver can be started on a system, provided they use different tcp ports. This is useful if, for example, different versions of MIDAS are in use on a single host at the same time. To start a version of mserver on a different port, use the -p argument, e.g. mserver -p XXXX -D To connect a client to this version of mserver, use the format "hostname:port", e.g.

  fe_test -h lin08:7066 -e expt

mserver arguments

Arguments [-h ] : help [-s ] : Single process server [-t ] : Multi thread server [-m ] : Multi process server (default) [-p ] : Port number; listen for connections on non-default tcp port [-d ] : Write debug info to /tmp/mserver.log [-D ] : Become a Daemon