[Samba] migrate samba3 to samba4

[Nur Hidayat]

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Hello list,
I have centos 5 server running samba-3.3.7-1 using tdbsam, no ldap.
I want to upgrade to samba 4 to implement active directory DC server.
What is the smoothest options do I have?
If I upgrade using RPM, I must upgrade to centos 6. If I upgrade from
source, some libraries from centos 6 is needed. So, I must install new
server, perhaps with new distro.
If I have new server with samba 4 installed, how to migrate samba user
and settings without rejoining to domain?
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