Mserver: Difference between revisions

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The midas documentation has moved. See [https://midas.triumf.ca/docs/develop/reference/reference/programs/#mserver mserver] on the Programs and options page and [https://midas.triumf.ca/docs/develop/features/deployment/multiple_machines/ Running on multiple machines] for the new documentation about the mserver program.
= Purpose =
The MIDAS remote server (<span style="color:darkcyan;">''mserver''</span>) provides [[Remote Access to a Midas experiment|remote access]] to any MIDAS client. Changes to {{Utility|name=mserver}}  (August 2015) make the '''default behaviour to reject all external network connections''' ([https://midas.triumf.ca/elog/Midas/1090 Note 1090]), so that only programs running on the localhost will be allowed.
{{Utility|name=mserver}} is needed when one or more of an experiment's MIDAS clients are running on a different host. In this case,
<ol>
<li> a <span style="color:darkcyan;">''mserver''</span> client must be started on the host where the experiment resides </li>
<li> and the user must take action to allow programs on remote machines to run on the host machine (see [[Security#MIDAS programs on remote machines]]). Without this action, only programs running on the local host will be allowed. </li>
</ol>
 
The <span style="color:darkcyan;">''mserver''</span> utility  usually runs in the background. In the case where debugging is required, {{Utility|name=mserver}} can be started with the -d flag which will write an entry for each transaction to a log file  {{Filepath|path=/tmp/mserver.log}}. The log entry contains the time stamp and RPC call request.
 
More than one copy of <span style="color:darkcyan;">''mserver''</span> can be started on a system, provided they use different tcp ports. This is useful if, for example, [[exptab|different experiments]] are in use on a single host at the same time.
 
= Arguments =
        [-e ] : experiment to connect to (see [[Common Parameters to MIDAS Utilities#Midas experiment (exptname)|MIDAS experiment]])
        [-h ] : help
        [-m ] : Multi process server (default)
        [-p ] : Port; listen for connections on specified tcp port. Default value is taken from ODB key <span style="color: purple; font-style:italic;">/Experiment/midas server port</span>.
        [-d ] : Write debug info to <span style="color:green; font-weight:normal; font-style:italic ">/tmp/mserver.log</span>
        [-D ] : Become a Daemon
 
= Usage =
Start  [[mserver]] on the default port (1175) as a Daemon :
> mserver -D
 
Start [[mserver]] on port 1176
> mserver -p 1176   
 
 
 
= Old version of mserver (pre-August 2015) =
The MIDAS remote server (<span style="color:darkcyan;">''mserver''</span>) provides [[Remote Access to a Midas experiment|remote access]] to any MIDAS client.
 
It is needed when one or more of an experiment's MIDAS clients are running on a different host. In this case, a <span style="color:darkcyan;">''mserver''</span> client must be started on the host where the experiment resides. To start a version of <span style="color:darkcyan;">''mserver''</span> on a different port, use the -p argument (see [[#Usage (old version)|usage]]). To restrict access to the remote host to certain nodes, use the -a argument as shown below.
 
==  Arguments (old version) ==
        [-h ] : help
        [-s ] : Single process server
        [-t ] : Multi thread server
        [-m ] : Multi process server (default)
        [-p ] : Port number; listen for connections on specified tcp port.
        [-a ] : Hostname: only allow access for a specified host. Multiple -a arguments can be used (see [[#Usage (old version)|Usage]]).
        [-d ] : Write debug info to /tmp/mserver.log
        [-D ] : Become a Daemon
 
== Usage (old version) ==
>mserver -D
 
>mserver -p 7072 -D
>mserver -p 7071 -D -a localhost -a node01 -a node02 -a node03
 
 
To connect a client to this version of mserver, use the format "hostname:port", e.g.
 
# frontend started from client node
fe_test -h node01:7071 -e test
 
# frontend started from the backend node00
ssh -n node01 /home/expt/online/fe_test.exe -h node00:7071 -e test -i 0 -D
 
[[Category:Remote Access Server]] [[Category:Utilities]] [[Category:Experiment]]

Latest revision as of 22:01, 30 October 2026

The midas documentation has moved. See mserver on the Programs and options page and Running on multiple machines for the new documentation about the mserver program.

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