11/6/2023 0 Comments Find uid and gid linuxThe above recipe uses the ugid-find âprintâ command to generate a list of LF-terminated path names. This way, there will be hardly any disruption to Windows users, and all Kerberos and Active Directory metadata associated with the user remains intact. Therefore we are not creating a new user identity and deleting an old one in the Active Directory. This would be counterproductive here.Äuring the migration process, the Active Directory Kerberos identity (principal name, SID, etc.) remains unaffected. NFSv4 does not communicate numeric UID or GID values, instead it uses LDAP to translate these into strings on the wire. This is because they are dealing here with UID/GID numbers that are no longer listed in LDAP, and the NFSv4 server will map all of these to nobody/nogroup. This way, only Unix files are affected by the migration.Īre only executed on NFSv3 clients. Once the UID and GID change in the Unix LDAP server has reached the NetApp name server database cache, all Windows NTFS files will show already the new (emulated) UID/GID via NFSv3, and therefore be ignored by the subsequent ugid-find and chown/chgrp invocations. ![]() ![]() It will then translate that CRSID via a Unix LDAP lookup into the UID that stat() shows. When a Unix user queries an NTFS file with stat(), the NetApp will first translate the SID of the file via an Active Directory LDAP lookup into a user name (CRSID). The trick is to first change the UID and GID of a user in the Unix LDAP tables, and then wait until that change has propagated through to the NetApp name server database cache. There is no need to chown/chgrp a Windows NTFS file, because such files have Windows SIDs instead of UIDs.Executing a chown/chgrp on a Windows NTFS file will turn it into a Unix file, and potentially destroy access-control list information as a result.We do not need and want to touch files with Windows NTFS attributes for several reasons: The filer can store files with either Unix or Windows NTFS access-control attributes. Some notes on the process Dealing with Windows NTFS files Remind the user to run the following commands as root on their own local Unix file systems, or do it for them, as agreed:Ĭhown -hcR -from=$old_UID $new_UID path. ![]() Finally, notify the user that they can login again.Xargs -r giddir-$old_GID As a result, we still have, as of 2016, 20 users with UID uiddir-$old_UID However, when the Computer Laboratory first used Unix file systems in the mid 1980s, that limit was still at 100. Modern POSIX operating systems (Linux, macOS, FreeBSD) expect users to have a numeric user identifier (UID) of at least 1000, as lower UIDs are reserved for pseudo-users allocated by the operating-system vendor. 5.5 Dealing with long-running processes.So I would go with the flow: Use whatever is prescribed in your organization (if there is such a rule) or whatever is default on your distro of choice (to minimize problems with applications that assume a certain system based on the distro used). (NFS permissions or the way they map Unix permissions on SMB ACL's.) In some organizations it may be there is a preference for the shared GID, because of the way the shared network resources are setup. ![]() And you can always get things to work by some creative use of chown and chgrp. There may be some software that assumes one or the other but for each case of software that prefers GID=UID you can find another piece of software that wants it the other way around. (750 is standard for GID=UID, 700 is preferred if multiple users share GID.) It doesn't really seem to matter as long as you use the UMASK appropriately. Some other Unix systems still prefer the other methodology. Most major Linux distro's these days seem to default to the UID=GID method. I had the same question a few years ago an did some research into the matter.Īs far as I have been able to determine there is no real major benefit to either method. It is mainly a matter of personal preference.
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