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14-NFS - CSE 265 System and Network Administration The...

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Spring 2008 CSE 265: System and Network Administration ©2004-2008 Brian D. Davison CSE 265: CSE 265: System and Network Administration System and Network Administration The Network File System NFS Introduction Server-side NFS Client-side NFS NFS Statistics with nfsstat Dedicated NFS File Servers Automatic Mounting
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Spring 2008 CSE 265: System and Network Administration ©2004-2008 Brian D. Davison NFS NFS Network File System Allows systems to share filesystems among computers Designed to be transparent and stateless Consists of A mounting protocol Mount server File service daemons Diagnostic utilities
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Spring 2008 CSE 265: System and Network Administration ©2004-2008 Brian D. Davison Magic cookies Magic cookies The server doesn't track which clients have mounted filesystems (stateless) Instead, the server discloses a secret/magic cookie that identifies the directory to the server on future access Often the cookie is just the filesystem major and minor device IDs, plus directory inode Unmounting and remounting the actual filesystem on the server normally changes the cookie
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Spring 2008 CSE 265: System and Network Administration ©2004-2008 Brian D. Davison NFS NFS Network File System Version 2: slow Originally released by Sun in 1985 Version 3: faster (common) Version 4: security, locking (new) Uses Sun's RPC (Remote Procedure Call) protocol (documented in RFC 1050, 1988) Supports UDP or TCP for transport File locking is worse under NFS v3 since servers are stateless
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Spring 2008 CSE 265: System and Network Administration ©2004-2008 Brian D. Davison Security and NFS Security and NFS Not originally designed for security!
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