Difference between revisions of "Mserver"

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The MIDAS remote server (<span style="color:darkcyan;">''mserver''</span>) provides [[Remote Access to a Midas experiment|remote access]] to any MIDAS client.  
 
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.
+
It 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 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.
+
The <span style="color:darkcyan;">''mserver''</span> 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 {{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. To start a version of <span style="color:darkcyan;">''mserver''</span> on a different port, use the -p argument (see [[#Example|example]]). To restrict access to the remote host to certain nodes, use the -a argument as shown below.
+
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 =
+
= 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 [[#Example|example]]). To restrict access to the remote host to certain nodes, use the -a argument as shown below.
 +
 
 +
==  Arguments (old version) ==
 
         [-h ] : help
 
         [-h ] : help
 
         [-s ] : Single process server
 
         [-s ] : Single process server
 
         [-t ] : Multi thread server
 
         [-t ] : Multi thread server
 
         [-m ] : Multi process server (default)
 
         [-m ] : Multi process server (default)
         [-p ] : Port number; listen for connections on non-default tcp port
+
         [-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|Usage]]).
+
         [-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 ] : Write debug info to /tmp/mserver.log
 
         [-D ] : Become a Daemon
 
         [-D ] : Become a Daemon
= Usage =
+
 
 +
== Usage (old version) ==
 
  >mserver -D
 
  >mserver -D
  

Revision as of 16:49, 17 August 2015


Purpose

The MIDAS remote server (mserver) provides 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,

  1. a mserver client must be started on the host where the experiment resides
  2. 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.


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 copy of mserver can be started on a system, provided they use different tcp ports. This is useful if, for example, different experiments are in use on a single host at the same time.

Arguments

       [-e ] : experiment to connect to (see 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 /Experiment/midas server port.
       [-d ] : Write debug info to /tmp/mserver.log
       [-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 (mserver) provides 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 mserver client must be started on the host where the experiment resides. To start a version of mserver on a different port, use the -p argument (see example). 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).
       [-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