Specific User Trace and multiple radiusd instant

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Hello everyone,

We use below freeradius. It works well. The OS is Linux Enterprise 5.4. Thanks.
freeradius2.x86_64                         2.1.12-3.el5                installed
freeradius2-krb5.x86_64                    2.1.12-3.el5                installed
freeradius2-ldap.x86_64                    2.1.12-3.el5                installed
freeradius2-mysql.x86_64                   2.1.12-3.el5                installed
freeradius2-perl.x86_64                    2.1.12-3.el5                installed
freeradius2-postgresql.x86_64              2.1.12-3.el5                installed
freeradius2-python.x86_64                  2.1.12-3.el5                installed
freeradius2-unixODBC.x86_64                2.1.12-3.el5                installed
freeradius2-utils.x86_64                   2.1.12-3.el5                installed

We got below two questions recently.

1.  We know 'radiusd -X' will run the radius in debuge mode. With large  amount user request, the debug information will be massive. It will be  difficult to read one specific user authentication process. Can anyone  advise how to debug a specific user's access process?

2. We tried  to run multiple radiusd at same server while the second failed. Can  anyone advise how to configure the server to run multiple radiusd simultaneously？

Thanks!

Tom
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