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MATLAB DISTRIBUTED COMPUTING SERVER 4 - SYSTEM ADMINISTRATORS GUIDE User Manual Page 20

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2 Network Administration
Security Consid
erations
The distributed
computing products do not provide any security measures.
Therefore, you s
hould be aware of the following security considerations:
• MATLAB workers r
un as whate ver user the administrator starts the n ode’s
mdce service un
der. By default, the mdce service starts as root on UNIX
and as
LocalSys
tem
on Windows. Because MATLAB provides sy stem calls,
users can submi
tjobsthatexecuteshellcommands.
• The mdce servic
e does not enforce any access control or authentication.
Anyone with loc
al or remote access to the m dce services can start and stop
their workers
and job managers, and query for their status.
• The job manage
r does not restrict access to the cluster, nor to job and task
data. Using a t
hird-party scheduler instead of the MathWorks job manager
could allow yo
u to take advantage of the security measures it provides.
• The distribut
ed computing p roces ses must all be on the same side of a
firewall, or
youmusttakemeasurestoenablethemtocommunicatewith
each other th
rough the firewall. Workers running tasks of the same parallel
job cannot be
firewalled off from each other, because their MPI-based
communicat
ion will not work.
• If certain p
orts are restricted, you can specify the ports used for distributed
computing.
See “Defining the Script Defaults” on page 2-10.
• If your netw
ork supports multicast, the distributed com puting proce sses
accommodat
e multicast. However, because multicast is disabled on many
networks f
or security reasons, you might require unicast communication
between di
stributed computing proce sses. Most examples of MDCE scripts
and Distri
buted Computing Toolbox functions in the documentation show
unicast us
age.
• If your org
anization is a member of the Internet Multicast Backbone
(MBone),
you need to ensure that your distributed computing cluster is
isolated
from MBone access if you are using multicast for distributed
computin
g. This is generally the default condition. If you have any
question
s about MBone membership, contact your network administrator.
2-4
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