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Setting up
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The dCache Book > Configuration of dCache > dCache as xRootd-Server > Setting up

Setting up

To allow file transfers in and out of dCache using xrootd, a new xrootd door must be started. This door acts then as the entry point to all xrootd requests. Compared to the native xrootd server-implementation (produced by SLAC), the xrootd door corresponds to the redirector node.

To enable the xrootd door, you have to change the layout file corresponding to your dCache-instance. Enable the xrootd-service within the domain that you want to run it by adding the following line 

..
[<domainName>/xrootd]
..

Example:

You can just add the following lines to the layout file: 

..
[xrootd-${host.name}Domain]
[xrootd-${host.name}Domain/xrootd]
..

After a restart of the domain running the xrootd door, done e.g. by executing 

[root] # ${dCacheHome}/bin/dcache restart xrootd-babelfishDomain
Stopping xrootd-babelfishDomain (pid=30246) 0 1 2 3 4 5 6 7 done
Starting xrootd-babelfishDomain done

the xrootd door should be running. A few minutes later it should appear at the web monitoring interface under "Cell Services" (see the section called “The Web Interface for Monitoring dCache”).

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Parameters

The default port the xrootd door is listening on is 1094. This can be changed two ways:

  1. Per door: Edit your instance’s layout file, for example /opt/d-cache/etc/layouts/example.conf and add the desired port for the xrootd door in a separate line (a restart of the domain(s) running the xrootd door is required): 

    ..
[xrootd-${host.name}Domain]
[xrootd-${host.name}Domain/xrootd]
    port = 1095
..

  2. Globally: Edit /opt/d-cache/etc/dcache.conf and add the variable xrootdPort with the desired value (a restart of the domain(s) running the xrootd door is required): 

    ..
xrootdPort=1095
..

For controlling the TCP-portrange within which xrootd-movers will start listening in the <pool>Domain, you can add the properties net.lan.port.min and net.lan.port.max to /opt/d-cache/etc/dcache.conf and adapt them according to your preferences. The default values can be viewed in /opt/d-cache/share/defaults/dcache.properties. 

..
net.lan.port.min=30100
net.lan.port.max=30200
..
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