Date:   Tue, 24 Jan 2023 00:06:46 +0800
From:   Wang Yugui <wangyugui@e16-tech.com>
To:     linux-nfs@vger.kernel.org
Subject: Re: any guide to install/test nfs sec=krb5?
In-Reply-To: <20230123120836.1D16.409509F4@e16-tech.com>
References: <20230123015546.5653.409509F4@e16-tech.com> <20230123120836.1D16.409509F4@e16-tech.com>
Message-Id: <20230124000645.AD00.409509F4@e16-tech.com>
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Hi,

> Hi,
> 
> > Hi,
> > 
> > > Is there any guide to install/test nfs sec=krb5?
> > 
> > A better document:
> > https://www.delltechnologies.com/asset/en-us/products/storage/industry-market/h17769_integrating_onefs_with_kerberos_wp.pdf
> > 3.1.2 Configurations for Kerberized NFS with AD
> > 
> > we just directly add nfs/ SPN in 'Figure 5 Check SPNs in AD'.
> > and we no longer need ''ktpass.exe -mapUse'  in another document:
> > http://doc.isilon.com/ECS/3.3/AdminGuide/ecs_t_file_access_confgure_kerberos.html
> > http://doc.isilon.com/ECS/3.7/AdminGuide/GUID-2018CF69-5F1E-4F3A-BA90-3659F85DE415.html
> > 
> > and then 'mount.nfs4 -o sec=krb5' works in rocky linux 9.1.
> 
> I test more case with different nfs server / nfs client version.
> 
> SPN host/
> 	'realm join' auto create
> SPN nfs/
> 	setspn.exe -S nfs/T3610 T3610; 	setspn.exe -S nfs/T3610.e16-tech.com T3610
> 
> 'kinit -k  nfs/t3610.e16-tech.com@E16-TECH.COM' no need to work
> 'kinit -k host/t3610.e16-tech.com@E16-TECH.COM' no need to work.
> 
> el9: rocky linux 9.1
> el8: oracle linux 8.6
> el7: centos 7.9
> 
> nfs-server/el9   nfs-client OK/el7, *1/el8, OK/el9
> nfs-server/el8   nfs-client OK/el7, *1/el8, *1/*2/el9
> nfs-server/el7   nfs-client OK/el7, OK/el8, *1/*2/el9
>    *1 Permission denied

sssd-ad/winbind-ad do not need rDNS.
but for nfs sec=krb5, we need rDNS to work.

here there is not only cables that connect to the switch, but also some cables 
that directly connect to another server.

>    *2 Invalid argument     # when kernel 5.15 in nfs-server, kerenl 6.1 in nfs-client

rpc-gssd.service maybe NOT running.

we need 'systemctl enable --now nfs-client.target'
#vendor preset: disabled@el9, enabled@el7/el8

Now sec=krb5 works well here.

Best Regards
Wang Yugui (wangyugui@e16-tech.com)
2023/01/23

> 
> nfs-utils version:  1.3.0/el7, 2.3.3/el8, 2.5.4/el9
> kernel: same 5.15.y/6.1.y on el9/el8/el7
> 
> Best Regards
> Wang Yugui (wangyugui@e16-tech.com)
> 2023/01/23