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devel / comp.protocols.kerberos / Re: kdb5_util-1.15.1: Invalid argument while making newly loaded database live

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o Re: kdb5_util-1.15.1: Invalid argument while making newly loaded database liveKen Hornstein

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Re: kdb5_util-1.15.1: Invalid argument while making newly loaded database live

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Subject: Re: kdb5_util-1.15.1: Invalid argument while making newly loaded
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 by: Ken Hornstein - Mon, 4 Mar 2024 15:55 UTC

>We have a setup where the kerberos database (db2) is hosted on an NFS
>server. There are multiple KDC servers each mounting the NFS share and
>serving traffic.

I have to say up front that it is generally agreed that putting any database
file on a NFS filesystem is a bad idea. Also, it kind of sounds like
your multiple KDCs are serving the SAME database file? If so, THAT is
a huge problem!

>>kdb5_util: Cannot open DB2 database
>'/var/kerberos/krb5kdc_shared/principal~': Invalid >argument while deleting
>bad database /var/kerberos/krb5kdc_shared/principal

I am looking at newer Kerberos code, so perhaps this has changed, but
that error comes from krb5_db_destroy() failing. For DB2, that ends
up calling krb5_db2_destroy(). That function does a lot of things,
and it's hard at a glance to figure out which part of it is failing; I
suspect the only way to figure out what is going wrong there is to build
a version of Kerberos with full debugging symbols and set a breakpoint
on krb5_db2_destroy(). I have a strong suspicion that the database file
is getting corrupted in a such a way that the other routines cannot
recover, and that's likely due to the use of NFS (especially if multiple
KDCs are using the same database file).

--Ken

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