CentOS7.4_Kerberized_NFS

Kerberos -
[root@Cent-Pro ~]# cat /var/kerberos/krb5kdc/kdc.conf
[kdcdefaults]
 kdc_ports = 88
 kdc_tcp_ports = 88

[realms]
 EXAMPLE.EXAM = {
  master_key_type = aes256-cts
  default_principal_flags = +preauth
  acl_file = /var/kerberos/krb5kdc/kadm5.acl
  dict_file = /usr/share/dict/words
  admin_keytab = /var/kerberos/krb5kdc/kadm5.keytab
  supported_enctypes = aes256-cts:normal aes128-cts:normal des3-hmac-sha1:normal arcfour-hmac:normal camellia256-cts:normal camellia128-cts:normal des-hmac-sha1:normal des-cbc-md5:normal des-cbc-crc:normal
 }
[root@Cent-Pro ~]# cat /var/kerberos/krb5kdc/kadm5.acl
*/admin@EXAMPLE.EXAM    *

root@Cent-Pro ~]# cat /etc/krb5.conf
# Configuration snippets may be placed in this directory as well
includedir /etc/krb5.conf.d/

[logging]
 default = FILE:/var/log/krb5libs.log
 kdc = FILE:/var/log/krb5kdc.log
 admin_server = FILE:/var/log/kadmind.log

[libdefaults]
 dns_lookup_realm = false
 ticket_lifetime = 24h
 renew_lifetime = 7d
 forwardable = true
 rdns = false
 default_realm = EXAMPLE.EXAM
 default_ccache_name = KEYRING:persistent:%{uid}

[realms]
 EXAMPLE.COM = {
  kdc = Cent-Pro.example.exam
  admin_server = Cent-Pro.example.exam
 }

[domain_realm]
 .example.exam = EXAMPLE.EXAM
 example.com = EXAMPLE.EXAM

-------------------

[root@CentOS-Server1 ~]# cat /etc/exports
#/nfsshare  CentOS-Client1.example.exam(rw)
/nfsshare   10.10.100.0/24(rw,no_root_squash)
/nfs_k_share    CentOS-Client1.example.exam(rw,sec=krb5p,sync)


The server and client machines are already autheticated and nfs directivess are present -

[root@CentOS-Client1 ~]# klist -k
Keytab name: FILE:/etc/krb5.keytab
KVNO Principal
---- --------------------------------------------------------------------------
   3 nfs/CentOS-Client1.example.exam@EXAMPLE.EXAM
   3 nfs/CentOS-Client1.example.exam@EXAMPLE.EXAM
   3 nfs/CentOS-Client1.example.exam@EXAMPLE.EXAM
   3 nfs/CentOS-Client1.example.exam@EXAMPLE.EXAM
   3 nfs/CentOS-Client1.example.exam@EXAMPLE.EXAM
   3 nfs/CentOS-Client1.example.exam@EXAMPLE.EXAM
   3 nfs/CentOS-Client1.example.exam@EXAMPLE.EXAM
   3 nfs/CentOS-Client1.example.exam@EXAMPLE.EXAM
[root@CentOS-Client1 ~]#

[root@CentOS-Server1 ~]# klist -k
Keytab name: FILE:/etc/krb5.keytab
KVNO Principal
---- --------------------------------------------------------------------------
   3 nfs/CentOS-Server1.example.exam@EXAMPLE.EXAM
   3 nfs/CentOS-Server1.example.exam@EXAMPLE.EXAM
   3 nfs/CentOS-Server1.example.exam@EXAMPLE.EXAM
   3 nfs/CentOS-Server1.example.exam@EXAMPLE.EXAM
   3 nfs/CentOS-Server1.example.exam@EXAMPLE.EXAM
   3 nfs/CentOS-Server1.example.exam@EXAMPLE.EXAM
   3 nfs/CentOS-Server1.example.exam@EXAMPLE.EXAM
   3 nfs/CentOS-Server1.example.exam@EXAMPLE.EXAM