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Don Burleson Blog 







Linux Nobody User Tips

Oracle Linux Tips by Donald BurlesonDecember 14, 2015

Linux Nobody User?

The opposite of the root user, who has all the power to perform system administration actions, is the nobody user . The nobody user has the least privileges in Linux. It uses the user UID 99 as a common value in Redhat. The nobody user, by default, belongs to the nobody group, also commonly set to group GID 99. As system administrator, the nobody user should be kept with only minimal privileges.  


User nobody does not own files, is a member of a non-privileged group and has no specific abilities. The user is commonly used by daemon programs as they send signals to each other and perform ptrace and strace (Linux debugging system calls), so it can read and write to the memory of other processes. Linux standard base recommends that a specific account is created for each daemon process. Doing so makes the security monitoring much easier. Caveat: By default, Oracle uses the nobody user and nobody group to perform external jobs. This, however, is configurable.

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